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

 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.

 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, August 21, 2017, 17:09

Two pellets of sol-gel SiO2+CNT were produced.  See lab book pg 44-46 for details. 

Samples were loaded in Ta boat, wrapped with heat shield (1 layer)

Synthesis temperature = 1600C.  TGHT ~ 460A/8.0V

Vacuum at 7.5 e-6 Torr.

TGHt Auto-ramp at 01A/min to reach 350A. 

 Thursday, August 24, 2017, 00:28

TGHT reached to 350A/5.9V, temp @ 1230C (in-line with the last measurement see elog 378).

Increase TGHT to 430, ramp at 0.1A/min.

 Thursday, August 24, 2017, 23:42

TGHT reached to 430A/7.87V, temp at 1410C. Outgassing pressure reached to peak at 430A before TGHT stabilized.  (Evolution of SiO(g)???)

Ramp up to 460A at 0.1A/min.

 Friday, August 25, 2017, 10:30

TGHT reached to 460A/8.6V, temp at 1520C.  More outgassing was observed as temp was increased.

Tapping up TGHT to reach 1600c.

Friday, August 25, 2017, 15:17

Temp reached to 1600C; TGHT at 492 A/9.3 V.  Temperature was held for 3 hours.  Due to a problem with the backing pump, the cooling down process was initiated. 

Sample will be taken out next Monday for evaluation.

Monday, June 24, 2019, 08:24

Total number of foils: 484

Total mass in  including container = 1495 grams

Total length packed 17.28 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate outgassing

Two TaC coated Ta wire springs inserted at either end.

Initially will heat via autoramp to OMEGA 1400 C , ramping TGHT at  0.1 A/min to reach 530A A (Omega slope set = 0.990)

Then temperature= (Correction to 1800C) 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 700A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max).  TBHT at 0.1 A/min.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

System was pumped down on Friday June 24th, 2019.

IGP1= 3.3 e-07 Torr

(EPICS was down this morning and came back up around 930 a.m.)

Will proceed to manually tap up TGHT and TBHT to 40A as soon as EPICS stability confirmed

Mondayy, June 24, 2019, 15:30

TBHT = 39 A, 0.4V

TGHT=40 A, 0.1V

IGP1= 4.3 e-06 Torr and trending down

Autoramp increments to 0.1 A/min , to 400A on TGHT and 230A on TBHT

Tuesday, June 25, 2019, 08:40

Current has only increased to 53 A and pressure limit reached.  Lowered current back to 51 A on TGHT and TBHT.  Waiting for pressure to stabilize.

Tuesday, June 25, 2019, 12:16

TGHT 51.3 A, 0.39 V

TBHT 51.1 A, 0.58 V

IGP1 = 1.91 e-05 Torr

Starting autoramp with  increments to 0.1 A/min , to 400A on TGHT and 230A on TBHT

 Saturday, June 29, 2019, 22:45

Autoramp increments for TGHT set to 0.2 A/min

 IGP1=2.4 e-06 Torr

 Sunday, June 30, 2019, 07:46

Autoramp incrementsTGHT set to 0.1 A/min to prevent pressure spike. 

IGP1= 1.5 e-05 Torr

 Sunday, June 30, 2019, 08:26

Set autoramp increments on TGHT back to 0.2 A/min

Sunday, June 30, 2019, 15:47

Set autoramp max on TGHT to 500 A

Sunday, June 30, 2019, 21:15

OMEGA = 1240C

TGHT= 465A, 7.0V

TBHT = 233A, 3.2V

IGP1= 1.6 e-05 Torr

Set autoramp max on TGHT to 600A

Monday, July 01, 2019, 09:48

OMEGA = 1605 C

TGHT = 599A, 9.7V

TBHT = 233A, 3.2V

IGP1= 1.3 e-06 Torr

Set autoramp max on TGHT to 650A

Monday, July 01, 2019, 18:21

OMEGA = 1630 C

TGHT = 650 A, 10.6V

TBHT = 233A, 3.2V

IGP1 = 9.7 e-07 Torr

Set utoramp max on TGHT to 700A

Monday, July 01, 2019, 22:07

OMEGA = 1663 C

TGHT = 682A, 11.4V

TBHT = 233A, 3.2V

IGP1= 1.5 e-06 Torr

Set autoramp max on TGHT to 730A

Tuesday, July 02, 2019, 08:15

OMEGA =1700 C

TGHT = 730A, 12.0V

TBHT = 233A, 3.2V

IGP1= 1.1 e-06 Torr

Set autoramp max on TGHT to 750A and increments to 0.4A/min

Tuesday, July 02, 2019, 09:49

Temperature on OMEGA began dropping.  Changed OMEGA slope to 1.09 (Elog 371) and temperature reading = 1884 C.  Aborted autoramp and lowered TGHT current to 740A.

Tuesday, July 02, 2019, 12:14

Temperature and pressure have dropped at a consistent rate. 

IGP1= 9.6 e-07 Torr

OMEGA = 1715 C

Will tap up manually to 750A on TGHT

No appreciable increase in pressure will tap back down to 745A on TGHT

Tuesday, July 02, 2019, 13:11

OMEGA = 1675 C

TGHT = 745A, 12.4V

TBHT = 233A, 3.2V

IGP1 = 1.03 e-06Torr

 Will start to ramp- down TGHT @ -2.0A/min

OMEGA = 1354 C

TGHT = 495A, 7.01V

TBHT = 233.2A, 3.2V

IGP1= 2.2 e-07 Torr

Continue ramp-down TGHT @ -2.0A/min

Tuesday, July 02, 2019, 17:14

TGHT = 285.5A, 3.4V

TBHT = 232A, 3.1V

IGP1= 1.4 e-07 Torr

Start TBHT ramp-down at -1.0 A/min

Wednesday, July 03, 2019, 08:37

Turned off TGHT and TBHT

IGP1 = 7.8 e-08 Torr

Wednesday, July 03, 2019, 13:18

Final total weight of Target = 1489.5 g

Removed 18 discs after weighing.

Tuesday, October 08, 2019, 14:14: Remove Flex line HS. 

HS: 42752-1

Waterlines not open yet.

Tuesday, October 08, 2019, 14:15: roughing.

Tuesday, October 08, 2019, 14:24: Turbo pump on. 

Tuesday, October 08, 2019, 14:32: TP @ speed. 

Wednesday, October 09, 2019, 13:24 

The initial pressure was 3.25e-7 Torr

The current was manually increased to 25 A on both TBHT and TGHT  at a rate of 1 A each 30 s for both heaters.

Wednesday, October 09, 2019, 13:33

At 1 pm an additional ram was made to TGHT 350 A and TBHT 200 at same rate.

 HS 42752-5 - Setup for Temperature mapping.

Friday, November 15, 2019, 13:26: Roughing. 

Friday, November 15, 2019, 13:36: Turbo pump on. 

Monday, November 18, 2019, 07:46: Waterlines opened. Vacuum ok @ 3.56e-07T.

Monday, November 18, 2019, 07:48: PS on.

Monday, November 18, 2019, 09:21: PS off. Vacuum slowly spiked to 1.23e-06T. Indicative of a small water leak. 

Monday, November 18, 2019, 09:24: HS waterlines purged. vacuum dropped to 5.54e-07T. 

Monday, November 18, 2019, 09:27: Valves closed. TP off. BP off.

Monday, November 18, 2019, 10:27: Venting.

Monday, November 18, 2019, 11:06: Gaskets checked / replaced. Roughing. 

Monday, November 18, 2019, 11:14: turbo pump on. 

Monday, November 18, 2019, 14:19: Waterlines opened. 

Monday, November 18, 2019, 14:23: Response on vacuum. Leak is still present & a higher rate (Has an immediate response). Turbos off. 

Monday, November 18, 2019, 14:28: Venting. 

Monday, November 18, 2019, 14:49: turbo pump on. 

Tuesday, November 19, 2019, 07:07: Waterlines opened. Leak is present.  Turbo pump off. 

Tuesday, November 19, 2019, 11:24: After venting, changed 1 gasket. Setup LD & completed a leak check with the lines pressurized to 75 PSI of He. 

Tuesday, November 19, 2019, 11:25: Roughing. 

Tuesday, November 19, 2019, 11:33: Turbo pump on. 

Wednesday, November 20, 2019, 08:59: Waterlines opened. Leak is present.  Turbo pump off.  

Wednesday, November 20, 2019, 11:26: FEBIAD Removed. U-Line installed to check Evap 2 Connection. FEBIAD examined outside. 

Wednesday, November 20, 2019, 11:34: Turbo pump on. 

Wednesday, November 20, 2019, 13:05: HPA off (Was running through HS line still. Vac @ 5.54e-06T).  

Wednesday, November 20, 2019, 13:07: Open waterline. Vacuum @ 3.88e-06T & dropping steadily.  

Wednesday, November 20, 2019, 13:12: Vacuum @ 3.69e-06T & dropping. No leak detected via Vac. 

Wednesday, November 20, 2019, 13:14: Waterline Closed / purged. Turbo pumps off. 

Wednesday, November 20, 2019, 13:58: Turbo pump on. 

Wednesday, November 20, 2019, 13:50: Cleaned seal / FEBIAD re-installed. Roughing.

Thursday, November 21, 2019, 08:06: Waterlines opened. Vacuum ok @ 4.10e-07T. 

Notes:

1) The FEBIAD left cooling line was the culprit for the leaks. A fine copper build up was noted on the gasket /  sealing face. Images included. 

2) Evap 2 was leak checked separately as well & is OK.

 Thursday, November 21, 2019, 08:09: PS on. Leak issue resolved (Evap 2 Elog 466). Vacuum @ 4.10e-07T.

Thursday, November 21, 2019, 08:15: Auto-ramping TGHT / TBHT @ 2 A per min to 300 / 150 A. 

Tuesday, November 26, 2019, 14:53

Total number of foils: 504

Total length packed 17.4 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Two TaC coated Ta wire springs inserted at either end.

Initially to ramp TGHT and TBHT to 50A at 1A/min

Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 530A A (Omega slope set = 0.990)

Then temperature= (Correected to 1800C) 1900 C, Omega Slope set = 0.990, manually and automatically ramp to 700A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

System experienced some vacuum issues due to cooling water leak in a heatshield line. 

Evaluation discs not included because no space.

Total Green disc mass measured = 58.250 g

Tuesday, November 26, 2019, 15:00

IGP1= 7.4e-06 Torr.  No leak issues found after last fix (Anders will add details).

Tuesday, November 26, 2019, 15:33

TGHT= 52.7A, .22V   TBHT= 49.3A, .52V

IGP1= 7.202 e-06 Torr (trending up so will allow to stabilize).

Wednesday, November 27, 2019, 06:09

left with autoramp waiting for vac to drop but no advance overnight.

Pressure did not seem to drop back below 3e-5 Torr magnitude, therefore not much advance in current ramp.

Thursday, November 28, 2019, 11:15

Continued ramping manually 

OMEGA = 1429 C  (0.99 slope), TGHT = 542A, 7.8V

With slope = 1.08 OMEGA = 1724 C, therefore staying at 0.99 slope

TaC coating sintering  plot suggests 753A to reach 1800C (See attachment 1)

Windows a little bit coated but not enough to disturb laser. 

Thursday, November 28, 2019, 12:17

TGHT =753A, 11.8V since 12:00 noon. 

TBHT= 233.4A, 3.3V

OMEGA= 1735 C (0.99 slope)

 Thursday, November 28, 2019, 13:01

OMEGA = 1860C (1.08 slope)

 Thursday, November 28, 2019, 14:38

OMEGA temperature began to creep up to ~1880.  Tapped TGHT current down to 733.5A, 11.4V

Thursday, November 28, 2019, 15:12

Checked windows and no significant additional buildup of obstructive material.

Temperature creeping up again.  Tap down TGHT current to 729 A, 11.2 V

OMEGA = 1870C at slope 1.08

 Thursday, November 28, 2019, 16:03

Temperature increase to 1880C

Tap down TGHT current to 715A, 10.9V

OMEGA= 1870 C (slope = 1.08)

Thursday, November 28, 2019, 16:22

Temperature creep to 1880 C

Tap down TGHT to 700A, 10.8V

OMEGA= 1845C

IGP1=2.2e-06 Torr

Thursday, November 28, 2019, 16:37

IGP1= 1.9e-06 Torr

OMEGA = 1850C (1.08 slope)

TGHT = 692A, 10.5V  TBHT= 233A, 3.2V

Initiating pressure ramp at -2A/min on TGHT and -1A/min on TBHT

Thursday, November 28, 2019, 16:45

IGP1= 1.28e-06 Torr

OMEGA= 1770 C (1.08 slope)

TGHT = 650A, 9.8V

ramp TGHT at -3.5A/min maintain TBHT at -1A/m in

 Thursday, November 28, 2019, 17:11

IGP1= 1.14e-06 Torr

OMEGA = 1730 C (1.08 slope)

ramp TGHT at -5A/min maintain TBHT at -1A/m

Thursday, November 28, 2019, 17:20

IGP1- 8.9e-07 Torr

OMEGA=1636C

ramp TGHT at -6A/min maintain TBHT at -1A/min

 Thursday, November 28, 2019, 17:34

IGP1= 7e-07 Torr

OMEGA= 1500 C (1.08 slope)

ramp TGHT at -8A/min maintain TBHT at -1A/min

TBHT = 183A

 OMEGA 1180C

TGHT =300 A

TBHT = 155A

Initiated -15A/min TGHT and -4A/min TBHT

IGP1= 5.2e-07 Torr

OMEGA below 1000C

begin manual tapdown

Thursday, November 28, 2019, 19:42

Target was dismounted after cooling.  Two graphite discs and end caps inserted.

This morning, the vacuum responded to shutting of the water of the heat shield circuit (leak rate without pumping leveling out). The vacuum chamber was vented and the heat shield with flexible lines was replaced with another heat shield with fixed lines. The chamber was again pumped down and water opened at ~150 mTorr to test the leak up rate without pumping. No leaks apparent, so continued pumping down with turbo pump. At a vacuum of about 1E-6 Torr the water was again supplied to the heat shield circuit and an increase in vacuum could be observed. Stopped the turbo pump and prepared to vent. Two new heat shield lines were brazed in the machine shop and fitted by Maico after lunch. During this time one of the old lines (from heat shield to feedthrough in box) was leak tested and a leak found at a location just above the VCR. The line had been twisted and due to the twist developed a leak. With the two lines replaced, the vacuum was pumped down again and water could be supplied without any increase in vacuum pressure at 1E-6 Torr. To facilitate the new copper tubing, the restraining bracket for the heat shield VCRs was not mounted. It will have to be fitted later. Until then, please contact Anders for help in removing the heat shield to prevent any damage to the new lines.

Darwin Ortiz Rosales wrote:

Tuesday, November 26, 2019, 14:53 Total number of foils: 504 Total length packed 17.4 cm container has 3 Ta heat shields. No endcaps inserted to facilitate out-gassing Two TaC coated Ta wire springs inserted at either end. Initially to ramp TGHT and TBHT to 50A at 1A/min Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 530A A (Omega slope set = 0.990) Then temperature= 1900 C (Correction = 1800 C, NOT 1900 - JW), Omega Slope set = 0.990 (use 1.08, check temp, JW), manually and automatically ramp to 700A (check temp to see if it's matching with the 1.08 slope), TGHT will be tapped up accordingly to reach desired Temp. TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max. Good vac at 3.00 e -5 Torr Bad vac at 5.00 e-5 Torr System experienced some vacuum issues due to cooling water leak in a heatshield line.  Evaluation discs not included because no space. Total Green disc mass measured = 58.250 g   Tuesday, November 26, 2019, 15:00 IGP1= 7.4e-06 Torr.  No leak issues found after last fix (Anders will add details). Tuesday, November 26, 2019, 15:33 TGHT= 52.7A, .22V   TBHT= 49.3A, .52V IGP1= 7.202 e-06 Torr (trending up so will allow to stabilize).

 Wednesday, November 27, 2019, 17:44

I'll take over from here to step up the target heater, and I'll coordinate it with Darwin. 

 Wednesday, November 27, 2019, 20:36

Note: Sintering temp should be at 1800 C, NOT 1900.  Use Omega slope 1.08 and check temperature.  Correction made on elog #471.

Continue to step up TGHT and TBHT, keeping vacuum below 1.5 e-5 Torr. 

 Thursday, November 28, 2019, 03:06

TGHT reached to 400A/5.29V, TBHT at 230A/3.13V. 

Vacuum coming down from 1.3 e-5 Torr.

OMEGA = 1105 C (slope at 0.99).

Instructions for Darwin:

1.  Confirm temperature - check the temp plot from the TaC coating step. 

2.  Change OMEGA slop to 1.08 - check to see if this matches the temp plot.  If not, bring it back to 0.99.

3.  Continue to step up TGHT, check temp at 1400C (change slop 1.08 and check), 1500 C, 1600 C (check windows for coating - if any coating, then OMEGA is no longer useful hereon)

4.  Use the temp plot and continue to tap up TGHT to reach 1800 C and hold it for at least 4 hours or until the vacuum goes below 1 e-6 Torr then proceed with cooling down.

5.  Use the auto cooling program for TGHT (-2A/min) and TBHT (-1A/min)

Note:  For ramping up TGHT, keep vacuum below 1.5 e-4 Torr and keep tapping up to reach 1800 C.  Above 1100 C, this should be a quick step to get to 1800 C; should take < 2 hrs to get there.  

See the striptool or the attachment below to see how I did it. 

Once the chamber is cool down, take out a few samples for SEM analysis. 

Good luck!

Friday, March 13, 2020, 13:52

Total number of foils: 493

Total length packed 17.4 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Two TaC coated Ta wire springs inserted at both ends.

Initially to ramp TGHT and TBHT to 50A at 1A/min

Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 530A A (Omega slope set = 0.990)

Then temperature = 1800 (C using slope 1.08 at after 1700C manually and automatically ramp to 700A then  TGHT will be tapped up accordingly to reach desired Temp).

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

Evaluation discs not included because no space.

Total Green disc mass measured = 58.78 g

Friday, March 13, 2020, 14:22

Container loaded and pressuring down started without any pump issues.

Friday, March 13, 2020, 23:26

IGP1= 9.1e-07 Torr

Start auto tap at .25A/min to 50A on both TBHT and TGHT

Saturday, March 14, 2020, 07:09

IGP1=6.9e-6 Torr

TGHT = 49.1 A, 0.58V

TBHT = 49.2A, .49V

Continue ramp to 80 A on both heaters at .0.25A/min (good vacuum 3.0 e-04 Torr, bad vaccum 5.0 e-04 Torr

Saturday, March 14, 2020, 08:22

IGP1=6.8 e-05 Torr

Pressure spike TGHT =63.7 A, 0.77 V; TBHT = 60.0 A , 0.62 V

Aborted ramp alow to stabilize (Tapped TBHT to 63.8 A

Saturday, March 14, 2020, 12:16

IGP1= 8.1e-05 Torr

start autoramp at 0.25A/min

Saturday, March 14, 2020, 17:47

IGP1= 2.9e-05 Torr

TGHT= 78.4A, 1.0 V

TBHT = 79.4A, .88 V

manual and automatic  tap up to 740A TGHT and 230A TBHT then tap manually to 1800 C (mostly at .075 A/min and increasing to 1A /min as pressure stabilizes)

Sunday, March 15, 2020, 22:40

OMEGA = 1711 C

TGHT = 784,6 A, 12.9V (readback)

TBHT = 232 A, 3.5 V

Tap TGHT to 800 A readback set to 815A

Sunday, March 15, 2020, 23:20

OMEGA =1801 C

TGHT = 799.2 A, 13.3 V, TBHT = 232.9, 3.6V

Start gradual tap-down as temperature rising (1810 C at end of this note)

Sunday, March 15, 2020, 23:49

OMEGAA = 1818 C

TGHT = 769.9A, 12.6 V; TBHT = 232.9 A, 3.6 V

Temperature dropping tapped back up to 799 A on TGHT read back (set to 815 A)

Monday, March 16, 2020, 04:10

OMEGA = 1395 C (not reliable)

TGHT = 799.2 A, 13.2 V

TBHT = 232.9 A, 3.6 V

IGP1 = 2.2 e-06 Torr

Initiate cooling at -1.5 A/min on TGHT to 600A (at 600 A increase cooling rate to 3 A/min ; at 300 A increase cooling to 4 A/min and start TBHT cooling at 1 A/min; at `200 A on TGHT increase cooling to 4 A/min and TBHT 2 A/min)

Monday, March 16, 2020, 09:43

TGHT = 0 A , 0.02V

TBHT = 53,2 A, .56 V  (increase cooling to 4 A/min)

IGP1= 1.12e-07 Torr

Monday, March 16, 2020, 10:37

IGP1= 9.5 e -8 Torr

TGHT and TBHT = 0A, 0V

Will unload container

Monday, March 16, 2020, 12:40

Ten discs removed for evaluation (6 from left side and 4 from right side)

two graphite discs placed at each end as well as two TaC coated and sintered end-caps

total length after sintering = 17.8 cm

 Thursday, July 16, 2020, 11:15

Coated Ta tube cotaining 233 SiC disks wrapped with Ta heat-shields (3 layers)

Desired temperature= 1800C (expected TGHT 410 A), TBHT will be set fixed at 230A (max).

Evap 2 was pumped down

 Friday, July 17, 2020, 08:49

 Sunday, July 19, 2020, 17:35

IGP1 = 2.6e-06 Torr

TGHT = 400 A, 7.2 V

TBHT = 233 A, 4.1 V

Tap manually  to 410 (expected 1800 C )

Note*  OMEGA reading cannot be obtained.  

Leave at 410 A on TGHT for 4 hours.

Sunday, July 19, 2020, 22:57

IGP1 = 7.0 e-07 Torr

TGHT= 410 A , 7.2 V

TBHT = 233 A, 4.2 V

Start cool down at -2A/min for TGHT and -1A/min for TBHT

 Monday, July 20, 2020, 12:20

IGP1 = 2.2e-07 Torr

Unloading target

Monday, July 20, 2020, 19:27 

Coated Ta tube cotaining 355 SiC disks wrapped with Ta heat-shields (3 layers)

Desired temperature= 1800C (expected TGHT 410 A), TBHT will be set fixed at 230A (max).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap 2 was left to pump down over night.

 Monday, July 20, 2020, 23:06

IPG1 = 3.1e-06 Torr

Start autoramp at .25A/min to 40A for both TGHT and TBHT

Tuesday, July 21, 2020, 08:06

TGHT = 40.3 A, 0.51 V

TBHT = 39.0 A, 0.46 V

increase auto ramp limit to 50 A for both TGHT and TBHT 

IGP1=1.8e-05 Torr

Tuesday, July 21, 2020, 16:22

IGP1= 1.5 e-05 Torr 

TGHT = 50.1 A, 0.65 V

TBHT = 50.0 A, 0.60 V

 Change ramp target to 350 A for TGHT and 230A for TBHT

Wednesday, July 22, 2020, 13:24

Stopped autoramp.  Will allow pressure to drop. 

TGHT = 64.0 A, 0.86 V

TBHT = 64.5 A, 0.82 V 

Thursday, July 23, 2020, 23:55

TGHT Reached 430 A,  7.7 V

OMEGA reads 1310 C but reading is not considered accurate so will leave at this current for 4 hours.

Friday, July 24, 2020, 11:31

IGP1 = 1.98e-07 Torr

Window for pyrometer was coated with condensate.  

Dismounted target and cleaned two windows in line with the pyrometer.

Monday, February 01, 2021, 13:52  

Ta boat loaded with 20 Disc on either end capped with Ta springs to prevent overexpansion.   discs wrapped Graphite foil and boat wrapped in Ta heat-shields (3 layers).

Sample A on left side and sample B on right side.

Desired temperature= 1800C (expected TGHT 410 A).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap2 left to pump down over night.

 Tuesday, February 02, 2021, 10:01

Pressure stable at IGP1= 7.8e-7 Torr

TGHT autoramp  set to 50 A @ 1/min

Tuesday, February 02, 2021, 13:45

IGP1=3.5e-6 Torr

TGHT =49.9 A, 0.56 V

Ramp at 1A/min to 100A

Wednesday, February 03, 2021, 08:25

IGP1= 5.5 e-07 Torr

TGHT = 100 A, , 1.2 V

Yesterday the camera failed to operate.  Cloud service discontinued.  The TS camera is offline but it is a different provider.  Will start ramping to 400A .

Ramp rate 2A/min

Wednesday, February 03, 2021, 15:55

ramped up to 520 A and 9.1V TGHT

Temperature average 1644 C but suspect actual temperature higher.

Held for 5 hours and started ramp down at -2A/min

Thursday, February 04, 2021, 9:35

IGP1= 2.99e-7 Torr

Begin pumpdown procedure and remove container

Note:  SiC evaporation on most discs.  The temperature was too high.  Need to repeat.

Saturday, February 13, 2021, 08:10

Ta boat loaded with 80 discs enclosed in graphite foil in pockets of 20.  Sample A at both ends and sample B in the middle spaced out. Boat wrapped in Ta heat-shields (3 layers).

(A B B A)

Desired temperature= 1800C (expected TGHT approx 410 A).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap2 left to pump down over previous night.

IGP1= 5.4e-7 Torr and stable

Initiating TGHT ramp up at 1 A/ min to 30 A

Saturday, February 13, 2021, 12:19

IGP1= 6.9e-06 Torr

Ramp to 50 A 1A/min

Saturday, February 13, 2021, 14:35

IGP1 = 6.4e-6 Torr

Pressure trending down. 

Saturday, February 13, 2021, 14:56

IGP1= 4.9 e-6 Torr

Initiate Ramp up @ 1 A/min to 400 A

Changed ramp up to 0.5 A/min at around 11:30 pm

Sunday, February 14, 2021, 11:43

The current will be ramped up to 420 A according to the trendline approximation (see attachement 1)

Sunday, February 14, 2021, 12:26

IGP1 = 8.9 e-06 Torr and trending down

TGHT = 420 A, 7.5 V

OMEGA = 1730 C

Will ramp up to 428 A manually 

Sunday, February 14, 2021, 12:30

Reached 428 A on TGHT.  

OMEGA = 1760 C

Will bump to 430 A and hold for 4 hours

OMEGA= 1765 C

Sunday, February 14, 2021, 18:00

OMEGA = 1789 C

IGP1= 7.5 e -7 Torr

TGHT = 430.5 A , 7.8 V

Start ramping down at -1A/min to zero A

Wednesday, April 28, 2021, 11:54

Total number of foils: 449 (not including analysis discs)

Total length packed 16.7 cm

5 extra analysis discs and 2 dr. Blade discs

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

One Ta disc inserted at front end

Initially to ramp TGHT and TBHT to 50A at0.5 A/min

Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 530A A (Omega slope set = 0.990)

Then temperature = 1800C

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

Thursday, April 29, 2021, 10:09

IGP1 = 6.5 e-07 Torr

Start heating at 0.5 A/min to 50 A on both TGHT and TBHT 

Thursday, April 29, 2021, 21:45

 IGP1= 7.7 e-06 

TGHT = 50.3A , 0.59 V

TBHT = 49.4 A, 0.56 V

Pressure is taking a while to equilibrate.  Will wait a bit more to continue heating

Thursday, April 29, 2021, 23:49

IGP1 = 7.2 e-06 Torr

will start ramping at 0.5 A/min to 100 A 

Saturday, May 01, 2021, 20:09 

Friday, April 30, 2021, 08:19

IGP1 pressure higher than bad vacuum.  Stopped autoramp.  Will allow vacuum to come back down and restart ramp. 

Saturday, May 01, 2021, 09:04

Yesterday the system had tripped.  All pumps had turned off and the pressure was found at 0.005 torr

vacuum was restarted.

 Current IGP1= 6.5e-07 Torr

Restarting heaters.  

Autoramp at 0.5A/min to 20A on both TGHT and TBHT

Saturday, May 01, 2021, 10:48

IGP1=5.9e-7 Torr

TGHT = 20.0 A, 0.24V

TBHT = 20A, 0.20V 

 Autoramp at 0.5A/min to 40A both TGHT and TBHT

Saturday, May 01, 2021, 13:26 

TGHT = 40.0 A, 0.47 V

TBHT= 39A, 0.44V

IGP1= 5.5 e-07 Torr

Autoramp at 0.5A/min to 60 A on both TGHT and TBHT

Saturday, May 01, 2021, 20:09

TGHT = 60.0 A, 0.72V

TBHT = 59.4 A, 0.69V

IGP1= 4.4e-07 Torr

Autoramp at 0.5A/min to 100 A on both TGHT and TBHT

Sunday, May 02, 2021, 18:30 

IGP1= 1.7 e-06 Torr

TGHT =100A, 1.3V

TBHT = 99.9A, 1.3V

Autoramp both heaters at 0.25A/min to 120A and monitor 

Sunday, May 02, 2021, 18:45

pressure increase to 4.1e-06 Torr.  TBHT unexpectedly rose to 120A and was manually tapped back down to 104 A.  Will keep both , TGHT and TBHT, at 104 A  for a while. 

Sunday, May 02, 2021, 19:50

Stepping at 0.5A/min to 105A then to 110 A on both TGHT and TBHT

Sunday, May 02, 2021, 22:10 

Will leave both TGHT and TBHT at 110 A until pressure comes back down

currently IGP1= 1.3e-05 Torr

Monday, May 03, 2021, 09:35 

IGP1= 2.2 e-06 Torr

Tapping TGHT and TBHT to 115A 

Monday, May 03, 2021, 11:30

 Tapping TGHT and TBHT to 120A @ 1A/min

Monday, May 03, 2021, 18:38

IGP1= 5.4e-06 Torr

TGHT = 130.3 A, 1.8 V

TBHT = 129.1 A, 1.8 V

Continue gradual ramping at 1A/min in increments of 5 A 

Tuesday, May 04, 2021, 09:27

IGP1= 3.2e-5 Torr

TGHT = 400 A, 6.0V

TBHT = 232 A, 3.6V

OMEGA = 1104 C

waiting for pressure to drop then will continue heating 

Tuesday, May 04, 2021, 17:27

TGHT = 420.1 A, 6.5V

TBHT= 232A, 3.6V

OMEGA = 1139 C

IGP1= 1.15e-5 Torr 

will increase ramp up at 0.5A/min to 430A and hold (TGHT)

Tuesday, May 04, 2021, 22:43

TGHT= 430A, 6.6V

TBHT = 232.8A, 3.6V

OMEGA= 1157 C

IGP1=6.6e-6 Torr

 Set Autoramp at 0.5A/min to 540 A (TGHT)

Wednesday, May 05, 2021, 08:09

IGP1= 7.5e-06 Torr

TGHT = 534 A, 8.5V

TBHT=232 A, 3.7 V 

OMEGA = 1485

Continue ramp at 0.5A/min to to 600 A on TGHT

Wednesday, May 05, 2021, 15:07

IGP1=1.2e-5 Torr

TGHT=601A, 9.6V

TBHT= 232A, 3.7V

OMEGA =1600 C

ramp to 650A on TGHT at 0.5A/min 

Wednesday, May 05, 2021, 20:05

Tapped TGHT to 694A, 11.4 V (manually)

TBHT= 232A, 3.7V

OMEGA =  1790 C

IGP1= 2.5e-05 Torr

Will monitor Pressure and temperature .  Will start 4 hour count.

Wednesday, May 05, 2021, 22:03

OMEGA = 1765 C 

TGHT = 694A, 11.5V

TBHT = 232A, 3.8 V

IPG1= 1.6e-05 Torr

Manually bumping TGHT to 700 A