Monday, July 10, 2017, 17:28

Two np-SiC fibrous pellets with different applied pressure:

1) 200MPa, 2)  335 MPa (see logbook pg 36 for more details). 

Desired heating temperature: 1550C (Previous setting: TGHT 400A/6.94V)

Two layers of Ta foils wrapped around the target boat.

Chamber is pumping down...

 Tuesday, July 11, 2017, 11:11

Pressured came down to 1.0e-6 Torr. 

Tapping up TGHT.

 Tuesday, July 11, 2017, 11:24

Tapped TGHT up to 45A - pressure stabilized at around 3.0e-5 Torr. 

Auto ramp 1.0A/min to reach 350A before tapping up further.

 Wednesday, July 12, 2017, 10:59

TGHT reached to 350A/5.5V, temp @ 1270C - much lower than expected; could be a short between the target container and the heat shield.  I actually had a had time adjusting the target legs to avoid shorting the cu-heat shield. 

Tapped TGHT further up to 375A/6.07V, Omega Temp at 1340C.  Holding current for about 50 mins, re-measured with pyrometer - temperature matches.

Wednesday, July 12, 2017, 14:49 

TGHT set at 450A/7.7A.  Temp at ~1550C.  See attachment for temp plot

Holding at temp for 5 days before cooling down on Monday July 17.

 Thursday, July 13, 2017, 17:52

TGHT tripped off due to bad IEVAP2:WFB1 water flow.  Not sure what was the cause.  Will leave the heater off for now and investigate this tomorrow.

 Friday, July 14, 2017, 11:48

Investigated the bad water flow situation.  It was due to a faulty water flow sensor.  The paddle wheel stopped turning until I gave it a tab.  We had a similar problem before with the water sensor, see elog ID 109.  It is probably the time to replace all the water sensors. 

 Tuesday, June 20, 2017, 15:58

Target consists of 470 discs.

Total packed length 3.4cm [exactly 7.8cm space on both sides]

Total mass 50.3105g [Incl foils + Ta wire on 6 packs]

Target consists of 350 single discs and 6x20 packs of Ta discs

Discs in target are arranged as follows: 1pack / 75singles / 1pack / 100singles / 2packs / 100singles / 1pack / 75singles / 1pack

1 long Ta Heat shield.

No endcaps inserted, no Rh foil inserted.

Chamber currently pumping down.

TBHT will be ramped up to 230A at 1.0A/min.

TGHT will be ramped up to 600A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

*Note: container accidentally engraved with WO#412218-6 when it should be WO#42218-6

Wednesday, June 21, 2017, 10:05 

HS water valves opened, no leaks detected.

Tapped up manually to 40A, vacuum stable.

IGP1 = 5.53e-7 Torr

IGP2 = 4.35e-7 Torr

Initiating auto-ramp.

 Wednesday, June 21, 2017, 14:48

TGHT stopped at 575A due to voltage limit sitting at 9V

Increased max setpoint of voltage to 14V.

Re-started auto-ramp starting at 575A.

Wednesday, June 21, 2017, 15:23  

TGHT = 600A, 8.95V

TBHT = 230A, 3.72V

IGP1 = 1.55e-6 Torr

IGP2 = 1.62e-6 Torr

OMEGA = 1538C

Increasing max setpoint of TGHT to 700A

 Wednesday, June 21, 2017, 16:21

TGHT = 700A, 10.57V

TBHT = 230A, 3.75V

IGP1 = 2.2e-6 Torr

IGP2 = 2.4e-6 Torr

OMEGA = 1730C

Increasing max setpoint of TGHT to 750A

 Friday, June 23, 2017, 15:41

TGHT = 780A, 11.77V

TBHT = 230A, 3.77V

IGP1 = 4.8e-7 Torr

IGP2 = 4.8e-7 Torr

OMEGA = 1890C

Conditioning process complete.

Initiating auto-cool at 2.0A/min for the TGHT and 1.0A/min for the TBHT.

 Monday, June 26, 2017, 10:51

Target vented in air and removed from evap2 today.

Endcaps inserted.

Target looks good!

 Wednesday, June 14, 2017, 15:49

Pellets previously made by Marla and weighed.

Pellets are placed inside a small graphite sample tube.

Graphite sample tube loaded with pellets is loaded into a previously TaC coated boat.

Boat is wrapped with 3x Ta heat shields.

Loaded into evap2.

Chamber currently pumping down.

 Thursday, June 15, 2017, 11:24

HS water valves were opened this morning, no leaks detected.

Tapped up manually to 50A, 0.44V

Vacuum currently rising starting to settle.

IGP1 = 1.51e-6 Torr.

One vacuum stabilizes will initiate auto ramp at a rate of 1.0 A/min up to a final set point of 150 A.

Final desired temperature of 1800C.

Laura Lambert wrote:

Wednesday, June 14, 2017, 15:49 Pellets previously made by Marla and weighed. Pellets are placed inside a small graphite sample tube. Graphite sample tube loaded with pellets is loaded into a previously TaC coated boat. Boat is wrapped with 3x Ta heat shields. Loaded into evap2. Chamber currently pumping down.  Thursday, June 15, 2017, 11:24 HS water valves were opened this morning, no leaks detected. Tapped up manually to 50A, 0.44V Vacuum currently rising starting to settle. IGP1 = 1.51e-6 Torr. One vacuum stabilizes will initiate auto ramp at a rate of 1.0 A/min up to a final set point of 150 A. Final desired temperature of 1800C.

 Friday, June 16, 2017, 10:37

IGP1 = 7.91e-7 torr.

TGHT = 167 A, 2.3 V.

Tapped up manually to 350A yesterday, remained there overnight.

IGP1 = 4.55e-7 torr

TGHT=350 A, 5.6 V,

Changed slope to 0.98

Checked temperature readings with mikron to confirm slope

Mikron LS = 1260C, RS=1290C

OMEGA= 1295C

Initiating auto ramp at 1.0A/min to a final set point of 450A.

Final desired temperature of 1600C (no longer need to go to 1800C).

*note: graphite sample tube has graphite endcaps inserted

Marla Cervantes wrote:

Laura Lambert wrote:  Wednesday, June 14, 2017, 15:49 Pellets previously made by Marla and weighed. Pellets are placed inside a small graphite sample tube. Graphite sample tube loaded with pellets is loaded into a previously TaC coated boat. Boat is wrapped with 3x Ta heat shields. Loaded into evap2. Chamber currently pumping down.  Thursday, June 15, 2017, 11:24 HS water valves were opened this morning, no leaks detected. Tapped up manually to 50A, 0.44V Vacuum currently rising starting to settle. IGP1 = 1.51e-6 Torr. One vacuum stabilizes will initiate auto ramp at a rate of 1.0 A/min up to a final set point of 150 A. Final desired temperature of 1800C.    Friday, June 16, 2017, 10:37 IGP1 = 7.91e-7 torr. TGHT = 167 A, 2.3 V. Tapped up manually to 350A yesterday, remained there overnight. IGP1 = 4.55e-7 torr TGHT=350 A, 5.6 V, Changed slope to 0.98 Checked temperature readings with mikron to confirm slope Mikron LS = 1260C, RS=1290C OMEGA= 1295C Initiating auto ramp at 1.0A/min to a final set point of 450A. Final desired temperature of 1600C (no longer need to go to 1800C). *note: graphite sample tube has graphite endcaps inserted

 Friday, June 16, 2017, 15:10

Tapped up manually to 420A and auto ramp at 1.0A/min to 450A.

IGP1= 7.15e-7 torr

TGHT=450 A, 7.85 V

OMEGA = 1605C

Process completed, initiating auto cool at 1.0A/min

Elog entry by Pauline

 Monday, June 19, 2017, 16:18

Vented in air and removed from evap2 this a.m.

Weirdly TGHT had tripped off at 10pm on friday June 16th

TGHT = 58A when it tripped off.

Nothing else tripped.

Power supply was still on.

Water was still running

But, in the epics water control box it showed green boxes for TGHT, HS and CHILLER...but all said trip in yellow next to the boxes...odd...

Also noted, before removing from evap2, noticed both legs were bent and touching heat shield, will look further into this...

 Monday, June 05, 2017, 15:20

Container coated with TaC using 'flushing technique' and let dry over weekend.

Cleaned ionizer tube with acetone, no coating inside ionizer tube.

Wrapped with 3 x Ta heat shields, incl center block

Currently pumping down in evap2

OMEGA slope = 0.98

Good vac at 3.0e-5, bad vac at 4.0e-5 Torr.

 Tuesday, June 06, 2017, 10:00

First time not turning water off and flushing lines after last use.

HS water valves have remained open since the last time evap2 was used [conditioning Ta#52]

No leak check done.

Tapped up manually to 35A.

Waited ~25min

Vacuum stable.

IGP1 = 2.9e-6 Torr

IGP2 = 4.8e-6 Torr

Initiating auto ramp for TGHT @ 0.2A/min to a max setpoint of 350A

Initiating auto ramp for TBHT @ 0.1A/min to a max setpoint of 230A

Once max setpoints achieved, will tap up manually to final desired temperature of 1900C

 Wednesday, June 07, 2017, 09:26

TGHT = 304A, 4.46V

TBHT = 169A, 2.769V

IGP1 = 6.1e-7 Torr

IGP2 = 7.3e-7 Torr

Vacuum stable.

Increasing ramping rate to 1.0A/min and 0.5A/min for the TGHT and TBHT respectively.

 Wednesday, June 07, 2017, 10:40

TGHT = 350A, 5.28V

TBHT = 203A, 3.39V

IGP1 = 1e-6 Torr

Increasing ramping rate for TBHT to 1.0A/min

Wednesday, June 07, 2017, 12:10 

TGHT = 350A, 5.26V

TBHT = 230A, 3.99V

IGP1 = 7.0e-7 Torr

IGP2 = 8.3e-7 Torr

OMEGA = 1600C

Vacuum stable.

Increasing max setpoint of TGHT to 400A

Re-initiating ramping rate of TGHT at 1.0A/min

 Wednesday, June 07, 2017, 15:42

Tapped up to reach final desired temperature.

TGHT = 450A, 7.28V

TBHT = 230A, 4.02V

IGP1 = 9.0e-7 Torr

IGP2 = 1.07e-6 Torr

OMEGA = 1910C

Will remain at max setpoints overnight.

 Thursday, June 08, 2017, 08:51

Remained at max setpoints for 17hrs.

TGHT = 450A, 7.28V

TBHT = 230A, 4.02V

IGP1 = 2.6e-7 Torr

IGP2 = 2.9e-7 Torr

OMEGA = 1899C

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Thursday, June 08, 2017, 16:28

 Vented in air and taken out this afternoon.

Container looks good!

Transferred into glove box.

 Tuesday, May 30, 2017, 14:36

Target consists of 400 discs.

Total packed length 2.9cm [exactly 8.05cm space on both sides]

Total mass 42.8228g [Incl foils + Ta wire on 4 packs]

Target consists of 320 single discs and 4x20 packs of Ta discs

Discs in target are arranged as follows: 80singles / 1pack / 80singles / 2packs / 80singles / 1pack / 80singles

3x Ta Heat shields.

No endcaps inserted, no Rh foil inserted.

Chamber currently pumping down.

TBHT will be ramped up to 230A at 1.0A/min.

TGHT will be ramped up to 350A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

Windows cleaned.

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

 Wednesday, May 31, 2017, 09:47

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Vacuum stable.

IGP1 = 4.58e-7 Torr

IGP2 = 3.68e-7 Torr

Initiating auto ramp.

 Wednesday, May 31, 2017, 14:07

IGP1 = 1.11e-6 Torr

IGP2 = 1.13e-6 Torr

TGHT = 354A, 5.45V

TBHT =233A, 4.01V

OMEGA = 1565C

Increasing max setpoint to 400A at same ramping rate.

 Wednesday, May 31, 2017, 14:41

IGP1 = 1.19e-6 Torr

IGP2 = 1.24e-6 Torr

TGHT = 401A, 6.37V

OMEGA = 1708C

Increasing max setpoint to 425A at same ramping rate.

Wednesday, May 31, 2017, 15:51

Tapped up to ~1900C

TGHT = 480A, 7.85V

TBHT = 230A, 4.06V

OMEGA = 1912C

IGP1 = 1.85e-6 Torr

IGP2 = 2.06e-6 Torr

Will remain at max setpoints for a couple days before cooling

 Friday, June 02, 2017, 13:19

Remained at max setpoint for 2days

TGHT = 480A, 7.85V

TBHT = 230A, 4.06V

OMEGA = 1885C

IGP1 = 2.15e-7 Torr

IGP2 = 2.07e-7 Torr

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Monday, June 05, 2017, 15:18

Vented in air and taken out this morning.

Target looks good 

 Wednesday, June 07, 2017, 15:41

Endcaps inserted.

Ta heat shield removed.

Rh foil inserted.

Handed off to assembly.

 Tuesday, May 16, 2017, 10:56

Target container contains 460 discs of SiC 

Target packed length = 17cm. 

Mass of SiC(green)  = 55.5152g

Consists of 4 packs of 5 and 440 singles.

Container is wrapped with 1x heatshield around each side of cooling fins; no end caps are inserted yet - coated spring inserted both sides to hold discs in place.

Sintering temp = 1800C

Chamber is currently being pumped down. 

 Tuesday, May 16, 2017, 15:27

HS water valves turned on, no leaks detected.

Tapped up manually to 30A

Waited ~30min , vacuum stable.

IGP1 = 8.25e-6 Torr

Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively.

TGHT max = 400A.  TBHT max at 230A. 

Slope on OMEGA = 1.09 [see elog i.d. # 370 for reasoning behind OMEGA slope choice]

 Friday, May 19, 2017, 10:13

TGHT = 250A, 3.11V     DR = 248A, 3.3V

TBHT = 137A, 1.68V     DR = 140A, 1.73V

OMEGA = 1100C

IGP1= 6.9e-6 Torr     DR = 1e-5mbar

IGP2 = 5.9e-6 Torr     DR = 6.45e-6 Torr

Vacuum stable.

Increasing ramping rate to 1.0A/min and 0.5A/min for the TGHT and TBHT respectively.

 Friday, May 19, 2017, 10:33

Change in plan and switching ramping rate to 0.5A/min and 0.2A/min for the TBHT and TGHT respectively.

 Friday, May 19, 2017, 14:49

TGHT = 400A, 5.46

TBHT = 200A, 2.66

IGP1 = 2.7e-5 Torr

IGP2 = 2.2e-5 Torr

OMEGA = 1200C

Increasing max setpoint for TGHT to 550A

Decreasing ramping rate to 0.2A/min and 0.1A/min for over the weekend.

 Tuesday, May 23, 2017, 09:23

TGHT = 550A, 8.37

TBHT = 230A, 3.14

IGP1 = 1.6e-7 Torr

IGP2 = 1.6e-7 Torr

OMEGA = 1570C

Increasing max setpoint for TGHT to 600A at rate to 0.5A/min

 Tuesday, May 23, 2017, 11:45

TGHT = 600A, 9.36

IGP1 = 3.5e-7 Torr

IGP2 = 3.8e-7 Torr

OMEGA = 1675C

Increasing max setpoint for TGHT to 625A at rate to 0.5A/min

 Tuesday, May 23, 2017, 13:03

TGHT = 625A, 9.80V

IGP1 = 5.2e-7 Torr

IGP2 = 5.7e-7 Torr

OMEGA = 1715C

OMEGA no longer valid around 640A as temperature drops instantly after tapping up.

Could be due to target movement at high temperature.

No obvious window coating.

Tapped up manually to 660A, 10.49V.

Will remain at max setpoint overnight.

 Wednesday, May 24, 2017, 11:13

TGHT = 660A, 10.74V

TGHT power supply = 662A, 11.00V

TBHT = 230A, 3.16V

TBHT power supply = 232A, 3.25V

IGP1 = 4.2e-7 Torr

IGP1 direct readout = 5.9e-7 mbar

IGP2 = 4.6e-8 Torr

IGP2 direct readout = 5e-7 Torr

Evap2 reached max setpoint yesterday afternoon.

Window has thiny coating - see attached photo.

OMEGA = 1800

MIKRON = ~1800

Initiating auto cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Wednesday, May 24, 2017, 11:36

Change of plan.

TGHT = 620A, TBHT = 210A

Ramping back-up to max setpoints and will remain at those points until vacuum starts to decrease more.

 Friday, May 26, 2017, 15:24

IGP1 = 2.1e-7 Torr

IGP2 = 2.2e-7 Torr

TGHT = 660A, 10.72V

TBHT = 230A, 3.21V

All windows coated.

Remained at max setpoints for ~3.5days.

Conditioning process complete.

Initiating auto-cool at 2A/min and 1A/min for the TGHT and TBHT respectively.

 Tuesday, May 30, 2017, 14:41

Target vented in air and removed from evap2

Looks good!

Endcaps inserted and expanded.

See photos attached.

 Thursday, April 27, 2017, 14:01

Target container contains 470 discs of SiC 

Target packed length = 16cm. 

Mass of SiC(green)  = 52.13g

Discs in target are arranged as follows: 5singles / 1pack / 65singles / 1pack / 75singles / 1pack / 75singles / 2packs / 75singles / 1pack / 75singles / 1pack / 55singles / 1pack / 5singles

Container is wrapped with 1x heatshield around each side of cooling fins; no end caps are inserted yet - coated spring inserted both sides to hold discs in place.

Sintering temp = 1800C

Chamber is currently being pumped down. 

Friday, April 28, 2017, 13:06

HS water valves turned on this morning, no leaks detected.

Tapped up manually to 40A

Waited ~3hrs , vacuum stable.

IGP1 = 4.13e-6 Torr

Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively.

TGHT max = 400A.  TBHT max at 230A. 

Slope on OMEGA = 1.08 [see elog i.d. # 326 for reasoning behind OMEGA slope choice]

 Tuesday, May 02, 2017, 09:24

IGP1 = 2.34e-6 Torr

TBHT = 230A, 3.15V

TGHT = 298A, 3.96V

OMEGA = 1030C

Vacuum stable, increasing ramping rate up to 0.5A/min

 Tuesday, May 02, 2017, 13:20

IGP1 = 1.3e-5 Torr

TGHT = 400A, 5.6V

OMEGA = 1175C

Increasing max setpoint to 500A

Laura Lambert wrote:

Thursday, April 27, 2017, 14:01 Target container contains 470 discs of SiC  Target packed length = 16cm.  Mass of SiC(green)  = 52.13g Discs in target are arranged as follows: 5singles / 1pack / 65singles / 1pack / 75singles / 1pack / 75singles / 2packs / 75singles / 1pack / 75singles / 1pack / 55singles / 1pack / 5singles Container is wrapped with 1x heatshield around each side of cooling fins; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Sintering temp = 1800C Chamber is currently being pumped down.  Friday, April 28, 2017, 13:06 HS water valves turned on this morning, no leaks detected. Tapped up manually to 40A Waited ~3hrs , vacuum stable. IGP1 = 4.13e-6 Torr Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. TGHT max = 400A.  TBHT max at 230A.  Slope on OMEGA = 1.08 [see elog i.d. # 326 for reasoning behind OMEGA slope choice]  Tuesday, May 02, 2017, 09:24 IGP1 = 2.34e-6 Torr TBHT = 230A, 3.15V TGHT = 298A, 3.96V OMEGA = 1030C Vacuum stable, increasing ramping rate up to 0.5A/min  Tuesday, May 02, 2017, 13:20 IGP1 = 1.3e-5 Torr TGHT = 400A, 5.6V OMEGA = 1175C Increasing max setpoint to 500A

  Wednesday, May 03, 2017, 13:33

TGHT had remained at 500A for 16hrs, vacuum had initially come down nicely.

Vacuum was starting to creep up when i came in this morning before 8am,  IGP1 was at 1.2e-5 Torr

TGHT = 500A, 7.77V

OMEGA = 1440C

Around 8:30 vacuum started to spike, so the TGHT was tapped down rapidly to 450A

Tapping the TGHT down made no difference to the vacuum.

By the time 450A was hit, it was too late and the spike in vacuum caused the evaporator to trip off.

Turbo pump in epics showed on, turbo pump showed on according to TP direct controls.

Everything was shut off and the venting tapped, this made it obvious the turbo pump was already off as there was no ramping down noises from the turbo pump.

TP control box turned off then on again, at this point the controls showed a 'fail' message.

Turns out the turbo pump control box was fried and that's what had caused the turbo pump to fail with no notice in epics causing the vacuum to spontaneously spike.

Waiting on a new one from vacuum group...

See photos attached of striptool screenshots.

 Wednesday, May 03, 2017, 15:03

New TP control boxed installed.

Turbo pump turned on, everything pumped down.

Vacuum good, IGP1 = 6.92e-7 Torr.

IGP2 still not working, won't turn on via epics.

Tried unplugging and plugging back in...still appears red with 'fail' message...

Laura Lambert wrote:

Laura Lambert wrote:  Thursday, April 27, 2017, 14:01 Target container contains 470 discs of SiC  Target packed length = 16cm.  Mass of SiC(green)  = 52.13g Discs in target are arranged as follows: 5singles / 1pack / 65singles / 1pack / 75singles / 1pack / 75singles / 2packs / 75singles / 1pack / 75singles / 1pack / 55singles / 1pack / 5singles Container is wrapped with 1x heatshield around each side of cooling fins; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Sintering temp = 1800C Chamber is currently being pumped down.  Friday, April 28, 2017, 13:06 HS water valves turned on this morning, no leaks detected. Tapped up manually to 40A Waited ~3hrs , vacuum stable. IGP1 = 4.13e-6 Torr Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. TGHT max = 400A.  TBHT max at 230A.  Slope on OMEGA = 1.08 [see elog i.d. # 326 for reasoning behind OMEGA slope choice]  Tuesday, May 02, 2017, 09:24 IGP1 = 2.34e-6 Torr TBHT = 230A, 3.15V TGHT = 298A, 3.96V OMEGA = 1030C Vacuum stable, increasing ramping rate up to 0.5A/min  Tuesday, May 02, 2017, 13:20 IGP1 = 1.3e-5 Torr TGHT = 400A, 5.6V OMEGA = 1175C Increasing max setpoint to 500A     Wednesday, May 03, 2017, 13:33 TGHT had remained at 500A for 16hrs, vacuum had initially come down nicely. Vacuum was starting to creep up when i came in this morning before 8am,  IGP1 was at 1.2e-5 Torr TGHT = 500A, 7.77V OMEGA = 1440C Around 8:30 vacuum started to spike, so the TGHT was tapped down rapidly to 450A Tapping the TGHT down made no difference to the vacuum. By the time 450A was hit, it was too late and the spike in vacuum caused the evaporator to trip off. Turbo pump in epics showed on, turbo pump showed on according to TP direct controls. Everything was shut off and the venting tapped, this made it obvious the turbo pump was already off as there was no ramping down noises from the turbo pump. TP control box turned off then on again, at this point the controls showed a 'fail' message. Turns out the turbo pump control box was fried and that's what had caused the turbo pump to fail with no notice in epics causing the vacuum to spontaneously spike. Waiting on a new one from vacuum group... See photos attached of striptool screenshots.  Wednesday, May 03, 2017, 15:03 New TP control boxed installed. Turbo pump turned on, everything pumped down. Vacuum good, IGP1 = 6.92e-7 Torr. IGP2 still not working, won't turn on via epics. Tried unplugging and plugging back in...still appears red with 'fail' message...

 Wednesday, May 03, 2017, 16:07

Unplugging and plugging back in seemed to work now that evap2 under vacuum

IGP2 works again.

Will look into replacement ion gauge...

Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote:  Thursday, April 27, 2017, 14:01 Target container contains 470 discs of SiC  Target packed length = 16cm.  Mass of SiC(green)  = 52.13g Discs in target are arranged as follows: 5singles / 1pack / 65singles / 1pack / 75singles / 1pack / 75singles / 2packs / 75singles / 1pack / 75singles / 1pack / 55singles / 1pack / 5singles Container is wrapped with 1x heatshield around each side of cooling fins; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Sintering temp = 1800C Chamber is currently being pumped down.  Friday, April 28, 2017, 13:06 HS water valves turned on this morning, no leaks detected. Tapped up manually to 40A Waited ~3hrs , vacuum stable. IGP1 = 4.13e-6 Torr Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. TGHT max = 400A.  TBHT max at 230A.  Slope on OMEGA = 1.08 [see elog i.d. # 326 for reasoning behind OMEGA slope choice]  Tuesday, May 02, 2017, 09:24 IGP1 = 2.34e-6 Torr TBHT = 230A, 3.15V TGHT = 298A, 3.96V OMEGA = 1030C Vacuum stable, increasing ramping rate up to 0.5A/min  Tuesday, May 02, 2017, 13:20 IGP1 = 1.3e-5 Torr TGHT = 400A, 5.6V OMEGA = 1175C Increasing max setpoint to 500A     Wednesday, May 03, 2017, 13:33 TGHT had remained at 500A for 16hrs, vacuum had initially come down nicely. Vacuum was starting to creep up when i came in this morning before 8am,  IGP1 was at 1.2e-5 Torr TGHT = 500A, 7.77V OMEGA = 1440C Around 8:30 vacuum started to spike, so the TGHT was tapped down rapidly to 450A Tapping the TGHT down made no difference to the vacuum. By the time 450A was hit, it was too late and the spike in vacuum caused the evaporator to trip off. Turbo pump in epics showed on, turbo pump showed on according to TP direct controls. Everything was shut off and the venting tapped, this made it obvious the turbo pump was already off as there was no ramping down noises from the turbo pump. TP control box turned off then on again, at this point the controls showed a 'fail' message. Turns out the turbo pump control box was fried and that's what had caused the turbo pump to fail with no notice in epics causing the vacuum to spontaneously spike. Waiting on a new one from vacuum group... See photos attached of striptool screenshots.  Wednesday, May 03, 2017, 15:03 New TP control boxed installed. Turbo pump turned on, everything pumped down. Vacuum good, IGP1 = 6.92e-7 Torr. IGP2 still not working, won't turn on via epics. Tried unplugging and plugging back in...still appears red with 'fail' message...    Wednesday, May 03, 2017, 16:07 Unplugging and plugging back in seemed to work now that evap2 under vacuum IGP2 works again. Will look into replacement ion gauge...

 Wednesday, May 03, 2017, 16:09

HS water valves opened, no leaks detected.

Tapped up manually to 40A.

Vacuum stable.

IGP1 = 3.6e-7 Torr

Initiated auto-ramp at 1.0A/min and 0.5A/min to 300A and 230A for the TGHT and TBHT respectively.

 Thursday, May 04, 2017, 08:41

Reached 300A, 230A 10hrs ago.

IGP1 = 1.5e-7 Torr

OMEGA = 1070C

Increasing max setpoint to 500A at a rate of 0.5A/min for TGHT

 Thursday, May 04, 2017, 14:58

Back up to max setpoint that was reached before evap2 tripped off.

TGHT = 500A, 7.65V

IGP1 = 9.3e-7 Torr

OMEGA = 1450C

Increasing max setpoint to 550A, ramping up at a lower rate of 0.2A/min since this will be done overnight.

 Friday, May 05, 2017, 08:53

TGHT = 550A, 8.64V

IGP1 = 2.8e-7 Torr

OMEGA = 1560C

Increasing max setpoint to 600A at a ramping rate of 0.5A/min

 Friday, May 05, 2017, 11:09

TGHT = 600A, 9.58V

IGP1 = 7.3e-7 Torr

OMEGA = 1670C

Increasing max setpoint to 625A at a ramping rate of 0.5A/min

 Friday, May 05, 2017, 12:05

TGHT = 625A, 10.05V

IGP1 = 9.9e-7 Torr

OMEGA = 1710C

Increasing max setpoint to 650A at a ramping rate of 0.5A/min

 Friday, May 05, 2017, 13:13

TGHT = 650A, 10.57V

IGP1 = 1.1e-6 Torr

OMEGA  = 1740C

Mikron through left side windown on outside bottom left edge on container = 1750C

Tapping up manually to 1800C

 Friday, May 05, 2017, 13:42

Adjusted slope to 1.09 so same spot on leg using MIKRON = OMEGA

TGHT = 680A, 11.08V

IGP1 = 1.6e-6 Torr

OMEGA = 1795C

MIKRON = 1795C

Plotting a temperature curve, the predicted required current to reach 1800C was 670A using a slope of 1.08

Currently sitting 10A above predicted required current.

After several minutes, temperature dropped a few degrees to 1790C

Window remains clear and uncoated.

Tapped up to TGHT = 685A, 11.2V

OMEGA = 1795C

Will remain at this setpoint over the weekend.

 Monday, May 08, 2017, 08:59

TGHT = 685A, 11.08V

TBHT = 230A, 3.24V

IGP1 = 1.98e-7 Torr

OMEGA has lowered to 1342C

Evap2 sat at max setpoints over the wknd.

Will check window port before cooling...

*UPDATE ON TRIP-OFF*

A closer look into the details using archives [see photos attached]:

TP tripped off TBHT and TGHT at ~8e-5Torr

Anything in the evaporator requires ~1hr to cool before turning things off.

In this scenario, the target was @ ~1440C. so ~30min post TP trip, the target may still be at ~1000C.

Anything above 0.02Torr could be close enough to atmopheric pressure that this would be cooling too fast and could lead to breaking the target/ cracking the Ta metal.

As one can see in the screenshots attached, the vacuum lingered around 0.005Torr for ~2hrs before anything was done.

This provided enough time for the target to cool before it was introduced to atmospheric pressure when the BV was closed when trying to figure out the problem.

In summary, the target 'should' be OK...will inspect target further when removed from the evaporator.

 Tuesday, May 09, 2017, 09:16

TGHT = 685A, 11.04V

TGHT power supply = 686A, 11.31V

TBHT = 230A, 3.24V

TBHT power supply = 236A, 3.32V

IGP1 = 1.6e-7 Torr

IGP1 direct readout = 2.3e-7 mbar

IGP2 = 6.8e-8 Torr

IGP2 direct readout = 8.46e-8 Torr

Evap2 reached max setpoint friday afternoon.

Window clearly coated - see attached photo.

Initiating auto cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Wednesday, May 10, 2017, 09:18

Vented in air and opened up this morning.

Inspected container carefully for any cracks/ marks due to TP tripping off at 1450C

Target looks good! 

One sample disc removed for SEM.

When removing disc for sample, the SiC came off the graphite backing and just SiC flake came out - see photo

Photos attached showing inside container with no Si crystal formation/ good clear path all the way through target and sample removed for tests

Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote:  Thursday, April 27, 2017, 14:01 Target container contains 470 discs of SiC  Target packed length = 16cm.  Mass of SiC(green)  = 52.13g Discs in target are arranged as follows: 5singles / 1pack / 65singles / 1pack / 75singles / 1pack / 75singles / 2packs / 75singles / 1pack / 75singles / 1pack / 55singles / 1pack / 5singles Container is wrapped with 1x heatshield around each side of cooling fins; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Sintering temp = 1800C Chamber is currently being pumped down.  Friday, April 28, 2017, 13:06 HS water valves turned on this morning, no leaks detected. Tapped up manually to 40A Waited ~3hrs , vacuum stable. IGP1 = 4.13e-6 Torr Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. TGHT max = 400A.  TBHT max at 230A.  Slope on OMEGA = 1.08 [see elog i.d. # 326 for reasoning behind OMEGA slope choice]  Tuesday, May 02, 2017, 09:24 IGP1 = 2.34e-6 Torr TBHT = 230A, 3.15V TGHT = 298A, 3.96V OMEGA = 1030C Vacuum stable, increasing ramping rate up to 0.5A/min  Tuesday, May 02, 2017, 13:20 IGP1 = 1.3e-5 Torr TGHT = 400A, 5.6V OMEGA = 1175C Increasing max setpoint to 500A     Wednesday, May 03, 2017, 13:33 TGHT had remained at 500A for 16hrs, vacuum had initially come down nicely. Vacuum was starting to creep up when i came in this morning before 8am,  IGP1 was at 1.2e-5 Torr TGHT = 500A, 7.77V OMEGA = 1440C Around 8:30 vacuum started to spike, so the TGHT was tapped down rapidly to 450A Tapping the TGHT down made no difference to the vacuum. By the time 450A was hit, it was too late and the spike in vacuum caused the evaporator to trip off. Turbo pump in epics showed on, turbo pump showed on according to TP direct controls. Everything was shut off and the venting tapped, this made it obvious the turbo pump was already off as there was no ramping down noises from the turbo pump. TP control box turned off then on again, at this point the controls showed a 'fail' message. Turns out the turbo pump control box was fried and that's what had caused the turbo pump to fail with no notice in epics causing the vacuum to spontaneously spike. Waiting on a new one from vacuum group... See photos attached of striptool screenshots.  Wednesday, May 03, 2017, 15:03 New TP control boxed installed. Turbo pump turned on, everything pumped down. Vacuum good, IGP1 = 6.92e-7 Torr. IGP2 still not working, won't turn on via epics. Tried unplugging and plugging back in...still appears red with 'fail' message...    Wednesday, May 03, 2017, 16:07 Unplugging and plugging back in seemed to work now that evap2 under vacuum IGP2 works again. Will look into replacement ion gauge...    Wednesday, May 03, 2017, 16:09 HS water valves opened, no leaks detected. Tapped up manually to 40A. Vacuum stable. IGP1 = 3.6e-7 Torr Initiated auto-ramp at 1.0A/min and 0.5A/min to 300A and 230A for the TGHT and TBHT respectively.  Thursday, May 04, 2017, 08:41 Reached 300A, 230A 10hrs ago. IGP1 = 1.5e-7 Torr OMEGA = 1070C Increasing max setpoint to 500A at a rate of 0.5A/min for TGHT  Thursday, May 04, 2017, 14:58 Back up to max setpoint that was reached before evap2 tripped off. TGHT = 500A, 7.65V IGP1 = 9.3e-7 Torr OMEGA = 1450C Increasing max setpoint to 550A, ramping up at a lower rate of 0.2A/min since this will be done overnight.  Friday, May 05, 2017, 08:53 TGHT = 550A, 8.64V IGP1 = 2.8e-7 Torr OMEGA = 1560C Increasing max setpoint to 600A at a ramping rate of 0.5A/min  Friday, May 05, 2017, 11:09 TGHT = 600A, 9.58V IGP1 = 7.3e-7 Torr OMEGA = 1670C Increasing max setpoint to 625A at a ramping rate of 0.5A/min  Friday, May 05, 2017, 12:05 TGHT = 625A, 10.05V IGP1 = 9.9e-7 Torr OMEGA = 1710C Increasing max setpoint to 650A at a ramping rate of 0.5A/min  Friday, May 05, 2017, 13:13 TGHT = 650A, 10.57V IGP1 = 1.1e-6 Torr OMEGA  = 1740C Mikron through left side windown on outside bottom left edge on container = 1750C Tapping up manually to 1800C  Friday, May 05, 2017, 13:42 Adjusted slope to 1.09 so same spot on leg using MIKRON = OMEGA TGHT = 680A, 11.08V IGP1 = 1.6e-6 Torr OMEGA = 1795C MIKRON = 1795C Plotting a temperature curve, the predicted required current to reach 1800C was 670A using a slope of 1.08 Currently sitting 10A above predicted required current. After several minutes, temperature dropped a few degrees to 1790C Window remains clear and uncoated. Tapped up to TGHT = 685A, 11.2V OMEGA = 1795C Will remain at this setpoint over the weekend.  Monday, May 08, 2017, 08:59 TGHT = 685A, 11.08V TBHT = 230A, 3.24V IGP1 = 1.98e-7 Torr OMEGA has lowered to 1342C Evap2 sat at max setpoints over the wknd. Will check window port before cooling...   *UPDATE ON TRIP-OFF* A closer look into the details using archives [see photos attached]: TP tripped off TBHT and TGHT at ~8e-5Torr Anything in the evaporator requires ~1hr to cool before turning things off. In this scenario, the target was @ ~1440C. so ~30min post TP trip, the target may still be at ~1000C. Anything above 0.02Torr could be close enough to atmopheric pressure that this would be cooling too fast and could lead to breaking the target/ cracking the Ta metal. As one can see in the screenshots attached, the vacuum lingered around 0.005Torr for ~2hrs before anything was done. This provided enough time for the target to cool before it was introduced to atmospheric pressure when the BV was closed when trying to figure out the problem. In summary, the target 'should' be OK...will inspect target further when removed from the evaporator.  Tuesday, May 09, 2017, 09:16 TGHT = 685A, 11.04V TGHT power supply = 686A, 11.31V TBHT = 230A, 3.24V TBHT power supply = 236A, 3.32V IGP1 = 1.6e-7 Torr IGP1 direct readout = 2.3e-7 mbar IGP2 = 6.8e-8 Torr IGP2 direct readout = 8.46e-8 Torr Evap2 reached max setpoint friday afternoon. Window clearly coated - see attached photo. Initiating auto cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.  Wednesday, May 10, 2017, 09:18 Vented in air and opened up this morning. Inspected container carefully for any cracks/ marks due to TP tripping off at 1450C Target looks good!  One sample disc removed for SEM. When removing disc for sample, the SiC came off the graphite backing and just SiC flake came out - see photo Photos attached showing inside container with no Si crystal formation/ good clear path all the way through target and sample removed for tests

 Thursday, May 11, 2017, 11:25

IGP2 has been having problems where sometimes it turns off and requires simply unplugging and plugging back in.

Ion gauge has been replaced.

At first the vacuum box appeared red on epics and when attempting to reset everything nothing would work and the backing pump would try and turn on then timeout.

Apparently this new ion gauge draws slightly more than the old one and this blew a fuse in the PLC.

Old fuse was 2A, so a new 3A fuse has been replaced - seems to be working fine now. 

 Thursday, May 11, 2017, 11:21

Turns out SiC HP-FEBIAD that has finished conditioning is loaded in the wrong container and it should be a SiC HP-FEBIAD cold transfer line...so rush on new target.

Container coated with TaC using new method: Ends taped off,  with liquid poured in and swirled around entire container, then poured back out - 'flushing technique'

Container is wrapped with 1x heatshield around each side of cooling fins, not incl center block.

Loaded into EVAP2 and currently pumping down.

 Thursday, May 11, 2017, 13:40

IGP1 = 1.85e-6 Torr.

HS water valves opened.

No leaks detected.

Tapped up manually to 35A.

Vacuum stable.

IGP1 = 3.2e-6 Torr

IGP2 = 4.2e-6 Torr

Initiated auto ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively.

Final setpoints for TGHT = 450A and TBHT = 230A, with final desired temp of 1900C

OMEGA slope = 0.98

 Friday, May 12, 2017, 07:57

IGP1 = 4.3e-7 Torr.

IGP2 = 4.4e-7 Torr

TGHT = 233A, 2.8V

TBHT = 130A, 1.6V

Increasing ramping rate to 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Friday, May 12, 2017, 08:54

Comparing direct readouts with epics:

IGP1: direct = 1.9e-6 Torr; epics = 1.3e-6 Torr

IGP2: direct = 1.55e-6 Torr; epics = 1.4e-6 Torr

TGHT: direct = 320A, 4.38V; epics = 321A, 4.19V

TBHT: direct = 181A, 2.40V; epics = 178A, 2.34V

 Friday, May 12, 2017, 10:28

IGP1 = 1.07e-6 Torr

IGP2 = 1.15e-6 Torr

TGHT = 450A, 6.37V

TBHT = 230A, 3.21V

OMEGA = 1197C

Increasing max setpoint of TGHT = 700A

 Friday, May 12, 2017, 13:06

IGP1 = 2.4e-6 Torr

IGP2 = 2.5e-6 Torr

TGHT = 696A, 11.21V

TBHT = 233A, 3.26V

OMEGA = 1758C

Increasing max setpoint of TGHT = 800A

 Friday, May 12, 2017, 13:32

TGHT maxed out at 715A but continued ramping.

This was noticed when current set of TGHT = 750A but readout = 715A

This is due to max voltage limit = 12.0V and readout =11.58V

Increasing TGHT max setpoint to 14.0V and restarting auto ramp from 714A

 Friday, May 12, 2017, 14:45

Container has reached max setpoint of ~1900C

TGHT setpoint = 775A

TGHT = 769A, 12.54V

TBHT = 233A, 3.28V

IGP1 = 2.94e-6 Torr

IGP2 = 2.99e-6 Torr

OMEGA = 1912C

Will remain at max setpoint over weekend.

See attached photos of temperature measurements using MIKRON while TGHT current set point = 770A.

Photos are not super accurate but good as a rough idea.

Ex. for left side the point in the camera is actually pointed slightly closer to the end of the container but in the photo it looks more centered.

Saturday, May 13, 2017, 10:52 by Anders

Ramping down heaters. Temp 1912 C. Vacuum IGP1 = 5.4e-7 Torr

Monday, May 15, 2017, 13:10

Vented in air and taken out this a.m.

Target container looks good. 

Fully sintered coating.

 Wednesday, May 10, 2017, 16:05

Loaded.

HS water valves opened, no leaks detected.

Started auto-ramp at a rate of 1A/30sec to a final setpoint of 580A

Laura Lambert wrote:

Wednesday, May 10, 2017, 16:05 Loaded. HS water valves opened, no leaks detected. Started auto-ramp at a rate of 1A/30sec to a final setpoint of 580A

 Wednesday, May 10, 2017, 21:31: TGHT at 580 A for 1 h. Vacuum came down to 1.4E-6 Torr. TGHT voltage stable. Ramping down.

Anders Mjos wrote:

Laura Lambert wrote:  Wednesday, May 10, 2017, 16:05 Loaded. HS water valves opened, no leaks detected. Started auto-ramp at a rate of 1A/30sec to a final setpoint of 580A    Wednesday, May 10, 2017, 21:31: TGHT at 580 A for 1 h. Vacuum came down to 1.4E-6 Torr. TGHT voltage stable. Ramping down.

 Thursday, May 11, 2017, 10:51

vented in air and opened it up this morning.

Heat shield looks good!

 Monday, May 08, 2017, 10:05

Turbo pump control box died last week.

Replaced with a new one.

Thursday, April 20, 2017, 12:38

3 samples are loaded into the Ta boat and wrapped with heat shield (1 long piece, 3 rounds):  2x of B3-92Mpa pellets and 10% pure PAN pellet as control.  See lab book page 32 for more details.

The B3-92Mpa pellets were previously heated to 1550C (TGHT 400A/6.94V), see elog#351

Attempting to heat samples up to 1800C to determine the weight loss and shrinkage. 

Est. TGHT 480A.

OK to auto ramp to 400A at 1A/min.  Check for coating on the window. 

Chamber is currently being pumped down.

 Thursday, April 20, 2017, 14:28

Pressure 3.14e-6 Torr.  Auto ramp TGHT at 1A/min to reach 400A. 

 Friday, April 21, 2017, 10:56

TGHT at 400A/6.75V, temp at 1475C (75C/0.19V lower). 

Tapping up TGHT

 Friday, April 21, 2017, 12:32

TGHT ramped up to 530A/9.85V, temp at 1800C. 

 Friday, April 21, 2017, 15:38

TGHT dropped slightly, no coating on windows. 

Checked with Mikron, agreed with the dropped temp. 

Tapped up TGHt to 545A/10.1V to reach 1800C.  Will keep at that temp for several days.

 Wednesday, April 26, 2017, 17:06

Samples have been heated at 1800C (-25C) for 7 days now (see attachment for archiver). 

Cooling down TGHT at 1A/min.

 Thursday, April 13, 2017, 12:01

Pellets made this morning and weighed.

Placed in a graphite boat which is placed inside a previously TaC coated boat.

Boat is wrapped with 3x Ta heat shields.

Loaded into evap2.

Chamber currently pumping down.

 Tuesday, April 18, 2017, 13:53

HS water valves were opened this morning, no leaks detected.

Tapped up manually to 100A, 1.28V

Vacuum stable.

IGP1 = 3.63e-6 Torr.

Initiating auto ramp at a rate of 1.0A/min to 150A

Final desired temperature of 1100C

 Tuesday, April 18, 2017, 14:57

TGHT = 150A, 2.08V

Still no temperature reading on OMEGA.

Vacuum stable, IGP1 = 1.16e-6 Torr.

Initiating auto ramp at the same rate of 1.0A/min up to 200A.

 Tuesday, April 18, 2017, 15:56

TGHT = 200A, 2.91V

OMEGA = 990C

IGP1 = 8.59e-7 Torr

Tapping up manually to 1100C...

 Wednesday, April 19, 2017, 08:34

TGHT = 235A, 3.47V

OMEGA = 1090C

IGP1 = 1.6e-7 Torr.

Has remained at ~1100C since 16:30 yesterday.

Intitiating auto-cool at 2.0A/min

 Thursday, April 20, 2017, 08:40

Vented in air and taken out yesterday.

Pellets look good.

No obvious colour change.

 Wednesday, April 05, 2017, 15:36

Coated container with TaC coating using spray technique this morning and let dry.

Wrapped with one long layer of Ta heat shield, wrapped around boat 3x

No ends to target boat

Installed in evap2 and pumping down now...

Laura Lambert wrote:

Wednesday, April 05, 2017, 15:36 Coated container with TaC coating using spray technique this morning and let dry. Wrapped with one long layer of Ta heat shield, wrapped around boat 3x No ends to target boat Installed in evap2 and pumping down now...

 Thursday, April 06, 2017, 08:56

Problems with IGP2

Won't turn on, has low voltage output.

See screenshot attached.

Laura Lambert wrote:

Laura Lambert wrote:  Wednesday, April 05, 2017, 15:36 Coated container with TaC coating using spray technique this morning and let dry. Wrapped with one long layer of Ta heat shield, wrapped around boat 3x No ends to target boat Installed in evap2 and pumping down now...    Thursday, April 06, 2017, 08:56 Problems with IGP2 Won't turn on, has low voltage output. See screenshot attached.

 Thursday, April 06, 2017, 11:12

Turns out it was just a bad connection.

See attached photos.

Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote:  Wednesday, April 05, 2017, 15:36 Coated container with TaC coating using spray technique this morning and let dry. Wrapped with one long layer of Ta heat shield, wrapped around boat 3x No ends to target boat Installed in evap2 and pumping down now...    Thursday, April 06, 2017, 08:56 Problems with IGP2 Won't turn on, has low voltage output. See screenshot attached.    Thursday, April 06, 2017, 11:12 Turns out it was just a bad connection. See attached photos.

Thursday, April 06, 2017, 13:16

HS water valves opened, no leaks detected.

Tapped up manually to 35A

Waited almost 2hrs

IGP1 = 9.9e-7 Torr

Initiating auto-ramp at 0.2A/min to 400A

Final desired temperature = 1900C

OMEGA slope = 0.98

Good vac at 3.0e-5, bad vac at 4.0e-5 Torr.

 Monday, April 10, 2017, 09:26

IGP1 = 1.79e-7 Torr

TGHT = 400A, 6.47V

OMEGA = 1505C

Tapping up manually to 1900C...

 Monday, April 10, 2017, 11:46

TGHT tripped off at 410A, ~1530C

Water is still on and good flow.

Vacuum was stable ~1.8e-7 Torr.

No power trips according to controls.

Not sure of reasoning behind trip.

Initially tried tapping back-up, no current was being applied.

Turned off and back on TGHT power supply - this restarted things and now works again.

Have tapped back up to 35A, vacuum still good.

Restarting auto-ramp to 400A at 1.0A/min

 Monday, April 10, 2017, 13:13

Vacuum looks good.

IGP1 = 1.1e-7 Torr

TGHT = 127A, 1.30V

Increasing ramping rate to 2.0A/min

 Monday, April 10, 2017, 16:08

IGP1 = 1.5e-7 Torr

TGHT = 400A, 6.24V

OMEGA = 1510V

Increasing auto ramp setpoint to 450A at a rate of 0.2A/min

 Wednesday, April 12, 2017, 11:06

IGP1 = 2.96e-7 Torr

TGHT = 555A, 9.74V

OMEGA = 1935C

Has remained at max setpoints overnight.

Initiating auto-cool at 2.0A/min

 Thursday, April 13, 2017, 11:59

vented in air and opened up this morning.

container looks good.

see photo attached.

Friday, March 31, 2017, 12:21

Two compressed pellets loaded into the target boat and wrapped with Ta foil.  (see lab book p32 for details).

Chamber is pumping down.

Desired temp 1550C, TGHT expected to be around 400A.

 Friday, March 31, 2017, 16:31

Auto-ramp at 0.5A/min to reach 350A.

 Saturday, April 01, 2017, 12:30

TGHT reached to 350A/5.7V, temp around 1200C - notice voltage is much lower than previous process (ID 351), possible target/heat shield shorted therefore lower temp observed. (This should not cause any damage to the container.) 

Continue to ramp up to 400A.  Notice some evolution of gasses similar to the previous process (ID351) during ramping up of TGHT around 220A . (see attachment1)

 Saturday, April 01, 2017, 13:52

TGHT reached to 400A/6.7V; temp stabilized at 1400C. 

Tap up to 1550, TGHT 456A/8.08V (3.7KW, about 1KW higher than before).

Pressure coming down (see attachment 2)

Hold temp for several days.

 Saturday, April 01, 2017, 17:22

Temp went up by 10C. Lowered TGHT to 450A.

Target container wrapped in 3x heat shield foils and installed by JW

 Monday, March 13, 2017, 15:33: Opened water for HS. Vacuum stable at IG1 1E-6 T 

Monday, March 13, 2017, 15:48: TGHT / TBHT to 30 / 15 A.

Monday, March 13, 2017, 15:54: Started auto-ramping to TGHT / TBHT 150 / 75 A at 1 / 0.5 A/min. Good/bad vacuum 3 / 4 E-5 Torr

Tuesday, March 14, 2017, 08:23: Continue auto-ramping to TGHT / TBHT 300 / 150 A. Vacuum stable at IG1 2.3E-7 T 

Tuesday, March 14, 2017, 11:18: Continue auto-ramping to TGHT / TBHT 350 / 200 A. Vacuum stable at IG1 3.8E-7 T 

Wednesday, March 15, 2017, 08:31: Continue auto-ramping to TGHT 375. Vacuum stable at IG1 2.5E-7 T. Omega at 1500 C

Wednesday, March 15, 2017, 16:34: Continue auto-ramping to TGHT 500. Vacuum increased to IG1 5.5E-7 T. Omega at 1887 C

Thursday, March 16, 2017, 08:34: Continue auto-ramping to TGHT 520. Vacuum increased to IG1 3.3E-7 T. Omega at 1888 C

Thursday, March 16, 2017, 08:48: TGHT at 521 A 8.99 V. Omega at 1899 C

Friday, March 17, 2017, 08:25: TGHT at 521 A 8.88 V. Omega at 1886 C. Vacuum IG1 2.5E-7 Torr

Ramping down

Wednesday, March 22, 2017, 08:42: Turbo pump stopped

Friday, March 10, 2017, 17:29

Three B3 pellets are loaded into the container for thermo test. 

(see lab book1 Pg 26, 28-30 for more detail about the materials)

Desired temp ~1500C; one long-sheet of Ta foil is used, est 400A. 

Auto ramping 0.5A/min to 300A first.  Check later...

 Saturday, March 11, 2017, 11:58

Increased TGHT from 300A to 350A last night at ramping rate of 0.5A/min.

Tapped up further from 350A to 400A, 6.92V (2.8kW), Temp measured at ~1550C. 

Pressure peaked at 1.5e-6 Torr and coming down when ramping TGHT from 350A to 400A. (see attachment1)

Will remain at the current.  Continue monitoring..

 Monday, March 13, 2017, 01:14

Temp was held at 1550C for about 1.5days. Vac stabilized at 3.08e-7 torr.  TGHT 400A/6.94V.

Initiated cooling at 1A/min. 

Next, Materials inspection.

 Monday, March 13, 2017, 11:24

Target has been at room temp for about 4 hours.  Venting chamber.

Tuesday, February 21, 2017, 15:19

Container coated with TaC using 'flushing technique' and let dry overnight.

Cleaned ionizer tube with acetone, no coating inside ionizer tube

Wrapped with 3 x Ta heat shields, incl center block

Currently pumping down in evap2

OMEGA slope = 0.98

Good vac at 3.0e-5, bad vac at 4.0e-5 Torr.

 Wednesday, February 22, 2017, 09:41

HS water valves opened, no leaks detected.

Tapped up manually to 35A

Waited ~45min

Vacuum stable.

IGP1 = 1.2e-6 Torr

Initiating auto ramp for TGHT @ 0.2A/min to a max setpoint of 350A

Initiating auto ramp for TBHT @ 0.1A/min to a max setpoint of 230A

Once max setpoints achieved, will tap up manually to final desired temperature of 1900C

Friday, February 24, 2017 by Anders

Continue manually to 1900 C

Friday, February 24, 2017, 16:24: TGHT at 400 A 6.35V IG1 = 4.5e-7 Torr 1660 C

Friday, February 24, 2017, 16:57: TGHT at 410 A 6.6 V IG1 = 5.0e-7 Torr 1700 C

Sunday, February 26, 2017 by Anders

Sunday, February 26, 2017, 14:13: TGHT at 425 A 6.9 V IG1 = 2.5e-7 Torr 

Lab closed for weekend. No access to temp reading.

 Monday, February 27, 2017, 16:12

Tapped up manually to 1900C this morning.

TGHT = 490A, 8.14V

TBHT = 230A, 2.98V

MIKRON = 1911C

OMEGA = 1904C

evap2 has remained at max setpoints for ~6hrs

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Tuesday, February 28, 2017, 11:57

Container finished sintering.

Vented in air and opened up this morning.

Container looks good 

 Friday, February 03, 2017, 14:17

The endcaps are stacked together with a punched out disc of graphite foil placed in between each endcap for separation so endcaps won't fuse together.

The end caps are further wrapped in a larger piece of graphite foil to hold together as a tube [same method used in elogID # 158 and 235]

There are also 4 coated springs, 2 on each side of the endcaps tube, with the endcaps tube residing in the middle of the boat.

The boat is wrapped with 3-layers of Ta heatshields.

Chamber is currently being pumped down.

Good vac at 3.0e-5, bad vac at 4.0e-5 Torr.

OMEGA slope = 0.98

 Monday, February 06, 2017, 09:29

Power outage this weekend and evap2 tripped off.

Re-pumping down now...

 Tuesday, February 07, 2017, 08:54

HS water valves opened, no leaks detected.

IGP1 = 1.9e-7 Torr

Tapped up manually to 35A

Vacuum stable.

IGP1 = 2.0e-7 Torr

Initiating auto-ramp at 0.2A/min with a final setpoint of 450A.

Final desired temperature = 1800C

 Wednesday, February 08, 2017, 09:52

IGP1 = 2.98e-7 Torr

TGHT = 325A, 3.5V

Vacuum stable.

Increasing ramping rate to 1.0A/min

 Wednesday, February 08, 2017, 11:46

IGP1 = 6.3e-7 Torr

TGHT = 433A, 4.89V

Increasing max setpoint to TGHT = 500A

OMEGA has still yet to show a temperature...should be reading points at this high in current

Will go down to the lab and follow up on OMEGA settings to confirm everything is set up ok before proceeding to a higher current...

 Wednesday, February 08, 2017, 16:03

IGP1 = 4e-7 Torr

TGHT = 500A, 5.75V

OMEGA still not reading

Initiating auto-cool at -2A/min

Will update elog with more details tomorrow

 Thursday, February 09, 2017, 10:52

Evap2 was cooled down and opened up this morning.

Turns out both legs on the target boat were touching the new heatshield and therefore had been loosing power.

Normally a boat at 500A would read ~1800C, in this scenario at 500A the boat read ~1000C.

A lot of power was being lost into the heatshield.

See photos attached of target boat sitting at 500A.

The heatshield is currently being ground down in those two spots to accommodate the target boat.

Laura Lambert wrote:

Friday, February 03, 2017, 14:17 The endcaps are stacked together with a punched out disc of graphite foil placed in between each endcap for separation so endcaps won't fuse together. The end caps are further wrapped in a larger piece of graphite foil to hold together as a tube [same method used in elogID # 158 and 235] There are also 4 coated springs, 2 on each side of the endcaps tube, with the endcaps tube residing in the middle of the boat. The boat is wrapped with 3-layers of Ta heatshields. Chamber is currently being pumped down. Good vac at 3.0e-5, bad vac at 4.0e-5 Torr. OMEGA slope = 0.98  Monday, February 06, 2017, 09:29 Power outage this weekend and evap2 tripped off. Re-pumping down now...  Tuesday, February 07, 2017, 08:54 HS water valves opened, no leaks detected. IGP1 = 1.9e-7 Torr Tapped up manually to 35A Vacuum stable. IGP1 = 2.0e-7 Torr Initiating auto-ramp at 0.2A/min with a final setpoint of 450A. Final desired temperature = 1800C  Wednesday, February 08, 2017, 09:52 IGP1 = 2.98e-7 Torr TGHT = 325A, 3.5V Vacuum stable. Increasing ramping rate to 1.0A/min  Wednesday, February 08, 2017, 11:46 IGP1 = 6.3e-7 Torr TGHT = 433A, 4.89V Increasing max setpoint to TGHT = 500A OMEGA has still yet to show a temperature...should be reading points at this high in current Will go down to the lab and follow up on OMEGA settings to confirm everything is set up ok before proceeding to a higher current...  Wednesday, February 08, 2017, 16:03 IGP1 = 4e-7 Torr TGHT = 500A, 5.75V OMEGA still not reading Initiating auto-cool at -2A/min Will update elog with more details tomorrow  Thursday, February 09, 2017, 10:52 Evap2 was cooled down and opened up this morning. Turns out both legs on the target boat were touching the new heatshield and therefore had been loosing power. Normally a boat at 500A would read ~1800C, in this scenario at 500A the boat read ~1000C. A lot of power was being lost into the heatshield. See photos attached of target boat sitting at 500A. The heatshield is currently being ground down in those two spots to accommodate the target boat.

 Tuesday, February 14, 2017, 15:43

Heatshield was ground back and target boat now fits nicely into heatshield without contact.

Laura Lambert wrote:

Laura Lambert wrote:  Friday, February 03, 2017, 14:17 The endcaps are stacked together with a punched out disc of graphite foil placed in between each endcap for separation so endcaps won't fuse together. The end caps are further wrapped in a larger piece of graphite foil to hold together as a tube [same method used in elogID # 158 and 235] There are also 4 coated springs, 2 on each side of the endcaps tube, with the endcaps tube residing in the middle of the boat. The boat is wrapped with 3-layers of Ta heatshields. Chamber is currently being pumped down. Good vac at 3.0e-5, bad vac at 4.0e-5 Torr. OMEGA slope = 0.98  Monday, February 06, 2017, 09:29 Power outage this weekend and evap2 tripped off. Re-pumping down now...  Tuesday, February 07, 2017, 08:54 HS water valves opened, no leaks detected. IGP1 = 1.9e-7 Torr Tapped up manually to 35A Vacuum stable. IGP1 = 2.0e-7 Torr Initiating auto-ramp at 0.2A/min with a final setpoint of 450A. Final desired temperature = 1800C  Wednesday, February 08, 2017, 09:52 IGP1 = 2.98e-7 Torr TGHT = 325A, 3.5V Vacuum stable. Increasing ramping rate to 1.0A/min  Wednesday, February 08, 2017, 11:46 IGP1 = 6.3e-7 Torr TGHT = 433A, 4.89V Increasing max setpoint to TGHT = 500A OMEGA has still yet to show a temperature...should be reading points at this high in current Will go down to the lab and follow up on OMEGA settings to confirm everything is set up ok before proceeding to a higher current...  Wednesday, February 08, 2017, 16:03 IGP1 = 4e-7 Torr TGHT = 500A, 5.75V OMEGA still not reading Initiating auto-cool at -2A/min Will update elog with more details tomorrow  Thursday, February 09, 2017, 10:52 Evap2 was cooled down and opened up this morning. Turns out both legs on the target boat were touching the new heatshield and therefore had been loosing power. Normally a boat at 500A would read ~1800C, in this scenario at 500A the boat read ~1000C. A lot of power was being lost into the heatshield. See photos attached of target boat sitting at 500A. The heatshield is currently being ground down in those two spots to accommodate the target boat.    Tuesday, February 14, 2017, 15:43 Heatshield was ground back and target boat now fits nicely into heatshield without contact.

 Tuesday, February 14, 2017, 15:44

Boat with endcaps and springs reloaded today and pumped back down this afternoon.

HS water valves opened, no leaks detected.

Tapped up manually to 35A

Vacuum stable.

IGP1 = 3.5e-6 Torr

Initiating auto-ramp at 0.2A/min with a final setpoint of 400A.

Final desired temperature = 1800C

 Wednesday, February 15, 2017, 10:24

IGP1 = 7.2e-7 Torr

TGHT = 260A, 3.95V

OMEGA = 1158C

Vacuum stable.

Increasing ramping rate to 1.0A/min.

 Wednesday, February 15, 2017, 13:02

IGP1 = 2.0e-6 Torr

TGHT = 400A, 6.67V

OMEGA = 1530C

Increasing final setpoint to 450A

 Wednesday, February 15, 2017, 13:55

IGP1 = 2.5e-6 Torr

TGHT =450A, 7.7V

OMEGA = 1640C

Increasing final setpoint to 500A

 Wednesday, February 15, 2017, 15:13

IGP1 = 1.8e-6 Torr

TGHT = 500A, 8.59V

OMEGA = 1770C

MIKRON = 1740C

Tapping up manually to ~1800C...

 Thursday, February 16, 2017, 09:09

IGP1 = 5.28e-7 Torr

TGHT = 520A, 9.1V

OMEGA = 1821C

Target boat has remained at max setpoints for 17.5hrs.

Initiating auto-cool at 1A/min

 Thursday, February 16, 2017, 13:49

Increasing auto-cool to 2.0A/min

 Friday, February 17, 2017, 16:00

Vented in air and opened up today.

Endcaps looks good  see photos attached

Thursday, February 09, 2017, 23:26

There are two types of samples being test for thermal stability:

1.  SiC-SiO2-Lys nanofiber mats

2.  SiC pellets

(see Lab Book for more info)

Desired temperature: ~1500C

One-Ta heat shield is used, est. TGHT 450A.

 Thursday, February 09, 2017, 23:38

TGHT currently at 322A/5.28V, OMEGA 1204C.

Vac 2.9e-6 Torr.

 Friday, February 10, 2017, 08:58

TGHT at 400A, temp at 1425C for 8 hours.

Decided to cool down for analysis.  Check for carboreduction for SiO2 at 1400C.  Then continue to ramp up to 1500C. 

Ramping down at 2A/min

 Friday, February 10, 2017, 10:47

Rapid out-gas (2.7e-6 to 3.8e-6 Torr) from TGHT 330A until current stopped at 400A (see attachment).  Could be the evolution of O2 from SiO2...