Laura Lambert wrote:

John Wong wrote:   Laura Lambert wrote:  Thursday, June 09, 2016, 15:39 First target using beta-SiC material! Target container contains 450 discs of SiC [4 x 5 packs + 430 single discs] Target packed length = 16cm.  Mass of 533 discs SiC(green)  = 53.8758g Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Sintering temp = 1800C, TGHT will be set accordingly.  TBHT max at 230A.  Chamber is currently being pumped down.  Friday, June 10, 2016, 13:24 HS water valves opened, no leaks detected. Tapping up manually to 70A... Auto ramp will be set for TGHT = 0.2A/min to a final setpoint of 520A Auto-ramp for TBHT = 0.1A/min to a final setpoint of 230A.      Friday, June 10, 2016, 16:27 TGHT stepped up to 70A/0.55V.  TGHT at 50A/0.62V.  Pressure stabilized at 5.5e-5 Torr. Initiated auto ramping.  TGHT at 0.2A/min --> 520A.  TBHT at 0.1A/min --> 230A.    Monday, June 13, 2016, 09:51 TGHT = 425A, 5.65V TBHT = 225A, 3.7V IGP1 = 8.7e-6 Torr. Increasing ramping rate to 1.0A/min...  Monday, June 13, 2016, 15:56 Tapped up manually from 520A to 1800C Extrapolated data on graph to determine correct current required to reach desired max temperature. Will remain at 1800C for ~48hrs See attachements for excel sheet and screenshot of striptool.

 Wednesday, June 15, 2016, 17:54

TGHT at 710A, 11.35V.  TBHT at 230A/3.86V. 

Omega reading droppd to 1130C due to coating on windows. 

Ionizer tube was measured (center) at around 1900C

Cooling down at 2A/min for TGHT, 1A/min for TBHT. 

Samples will be collected prior to cleaning the windows.

NEXT:  Conditioning.

John Wong wrote:

Laura Lambert wrote: John Wong wrote:   Laura Lambert wrote:  Thursday, June 09, 2016, 15:39 First target using beta-SiC material! Target container contains 450 discs of SiC [4 x 5 packs + 430 single discs] Target packed length = 16cm.  Mass of 533 discs SiC(green)  = 53.8758g Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Sintering temp = 1800C, TGHT will be set accordingly.  TBHT max at 230A.  Chamber is currently being pumped down.  Friday, June 10, 2016, 13:24 HS water valves opened, no leaks detected. Tapping up manually to 70A... Auto ramp will be set for TGHT = 0.2A/min to a final setpoint of 520A Auto-ramp for TBHT = 0.1A/min to a final setpoint of 230A.      Friday, June 10, 2016, 16:27 TGHT stepped up to 70A/0.55V.  TGHT at 50A/0.62V.  Pressure stabilized at 5.5e-5 Torr. Initiated auto ramping.  TGHT at 0.2A/min --> 520A.  TBHT at 0.1A/min --> 230A.    Monday, June 13, 2016, 09:51 TGHT = 425A, 5.65V TBHT = 225A, 3.7V IGP1 = 8.7e-6 Torr. Increasing ramping rate to 1.0A/min...  Monday, June 13, 2016, 15:56 Tapped up manually from 520A to 1800C Extrapolated data on graph to determine correct current required to reach desired max temperature. Will remain at 1800C for ~48hrs See attachements for excel sheet and screenshot of striptool.    Wednesday, June 15, 2016, 17:54 TGHT at 710A, 11.35V.  TBHT at 230A/3.86V.  Omega reading droppd to 1130C due to coating on windows.  Ionizer tube was measured (center) at around 1900C Cooling down at 2A/min for TGHT, 1A/min for TBHT.  Samples will be collected prior to cleaning the windows. NEXT:  Conditioning.

Thursday, June 16, 2016, 09:29

vented in air and opened up this morning.

took some samples to be tested.

Tuesday, September 01, 2015, 17:16

Target container contains 533 discs of SiC with packed length of 17cm. 

Mass of 533 discs SiC(green)  = 57.8979g

Total mass SiC(green) + target container = 1455g

Container is wrapped with 3 heatshields; no end caps are inserted yet.

Sintering temp at 1800C - TGHT will be set accordingly.  TBHT max at 230A. 

Chamber is currently being pumped down. 

John Wong wrote:

Tuesday, September 01, 2015, 17:16 Target container contains 533 discs of SiC with packed length of 17cm.  Mass of 533 discs SiC(green)  = 57.8979g Total mass SiC(green) + target container = 1455g Container is wrapped with 3 heatshields; no end caps are inserted yet. Sintering temp at 1800C - TGHT will be set accordingly.  TBHT max at 230A.  Chamber is currently being pumped down.

 Wednesday, September 02, 2015, 09:11

HS water valves opened, no leaks detected.

IGP1 = 1.15e-6 Torr

Tapped up manually to 40A.

Waited ~1hr40 for vacuum to stabilize.

IGP1 = 3.6e-6 Torr.

Max setpoints set to TGHT = 630A and TBHT = 230A, ~1400C

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

Once max setpoints achieved, will tap up manually until window port becomes coated [as previously observed]

Once window port becomes coated will leave at set temp for ~4hrs to continue with outgassing, then cool down, clean window and ramp back up.

If LS port still clean, will continue to ramp up to final desired temperature of 1800C.

 Wednesday, September 02, 2015, 14:23

IGP1 = 4.0e-5 Torr.

Vacuum too high, stopped auto-ramp and tapped down manually.

Dropped TGHT down from 80A to 50A

Dropped TBHT down from 55A to 50A

Wednesday, September 02, 2015, 15:29

Vacuum down to IGP1 = 1.2e-5 Torr.

Re-initiating auto-ramp...

 Tuesday, September 08, 2015, 10:04

IGP1 = 4.5e-7 Torr.

TGHT = 630A, 9.6V

TBHT = 230A, 3.2V

DV = 0.22V

OMEGA RS = 1476C

OMEGA LS = 1450C

see attached photo for screenshot.

will tap up manually with a visual on both window ports...

Laura Lambert wrote:

John Wong wrote: Tuesday, September 01, 2015, 17:16 Target container contains 533 discs of SiC with packed length of 17cm.  Mass of 533 discs SiC(green)  = 57.8979g Total mass SiC(green) + target container = 1455g Container is wrapped with 3 heatshields; no end caps are inserted yet. Sintering temp at 1800C - TGHT will be set accordingly.  TBHT max at 230A.  Chamber is currently being pumped down.     Wednesday, September 02, 2015, 09:11 HS water valves opened, no leaks detected. IGP1 = 1.15e-6 Torr Tapped up manually to 40A. Waited ~1hr40 for vacuum to stabilize. IGP1 = 3.6e-6 Torr. Max setpoints set to TGHT = 630A and TBHT = 230A, ~1400C Initiating auto ramp at a rate of 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. Once max setpoints achieved, will tap up manually until window port becomes coated [as previously observed] Once window port becomes coated will leave at set temp for ~4hrs to continue with outgassing, then cool down, clean window and ramp back up. If LS port still clean, will continue to ramp up to final desired temperature of 1800C.  Wednesday, September 02, 2015, 14:23 IGP1 = 4.0e-5 Torr. Vacuum too high, stopped auto-ramp and tapped down manually. Dropped TGHT down from 80A to 50A Dropped TBHT down from 55A to 50A Wednesday, September 02, 2015, 15:29 Vacuum down to IGP1 = 1.2e-5 Torr. Re-initiating auto-ramp...  Tuesday, September 08, 2015, 10:04 IGP1 = 4.5e-7 Torr. TGHT = 630A, 9.6V TBHT = 230A, 3.2V DV = 0.22V OMEGA RS = 1476C OMEGA LS = 1450C see attached photo for screenshot. will tap up manually with a visual on both window ports...

 Tuesday, September 08, 2015, 15:44

TGHT has stepped up to 820A.  Coating on both windows is becoming obvious and it's interfering the temp readers; however, the left window (see attachment, which is further away from the target) is lightly coated than the right.  See attachment for The Temp (and Power) vs current plots.

Target will remained heated at the current and will be cooled down later today. 

The target will be re-conditioned up to 820A and temp and mass will be re-measured.

Plans:

The chamber will be vented tomorrow and the target will be taken out to weigh for mass change. 

The chamber windows will need to be clean.

A piece of Ta foil will be cover in front of the ionizer to trap any loss material (if any).

 Tuesday, September 08, 2015, 17:37

TGHT was at 800A for 2 hours before ramping up 820A for another 2 hours heating.  More coating on the right window is observed and temp reading came down to 1340C.  The left window remains the same and temp reads at 1646C.  

Ramping TGHT/TBHT to 0A at 2A/min and 1A/min, respectively.  

 Wednesday, September 09, 2015, 12:27

Result after the sintering process:

No yellow crystal formed (compared to previously observed SiC targets that heated up above 1900C). 

Total green mass = 57.90g 

mass of graphite foil = 0.035g x 533 discs = 18.7g 

mass of green SiC = 39.30g 

Target container with SiC before sintered = 1455g 

Target container after sintered = 1450g 

mass loss ~ 5.0g ~ 13% organic mass, as expected!  

The target will undergo the re-condition stage, and the temperature will be measured from 600A to 820A. 

 Friday, April 17, 2015, 16:01

Total number of foils: 520 discs

Total mass of materials [incl graphite foils]: 60.2441g

Total length packed: 17.0cm

Container is wrapped with 3x Ta-heat shields.

No endcaps inserted to allow outgasing.

Currently being pumped down.

 Monday, April 20, 2015, 11:08

Target container is coated with TaC and wrapped with 3-Ta heat shields, not incl center block.

TGHT and TBHT will be ramped up to 820A and 230A, respectively.

Chamber pumped down over the weekend.

IGP1 = 2.1e-7 Torr.

HS cooling water valves opened; no leaks detected.

TGHT max voltage = 18V, TBHT max voltage = 5V

....

attempted to start stepping up manually.

power supply not responding to epics controls for TBHT only...looking into problems now...

 Monday, April 20, 2015, 16:06

Epics is working.

Power supply connections unplugged/plugged back in.

Everything working again.

Tapped up manually to 40A.

Waited ~1hr30 for vacuum to stabilize.

IGP1 = 1.8e-6 Torr.

Good vac = 3e-5 Torr. Bad vac = 4e-5 Torr.

TGHT and TBHT will be ramped up to 820A and 230A, respectively.

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

 Wednesday, April 22, 2015, 15:23

TGHT = 200A, 2.26V; TBHT = 117A, 1.58V

IGP1 = 9.8e-6 Torr.

Increasing auto-ramp to 0.4A/min and 0.2A/min for the TGHT and TBHT respectively.

Laura Lambert wrote:

Friday, April 17, 2015, 16:01 Total number of foils: 520 discs Total mass of materials [incl graphite foils]: 60.2441g Total length packed: 17.0cm Container is wrapped with 3x Ta-heat shields. No endcaps inserted to allow outgasing. Currently being pumped down.  Monday, April 20, 2015, 11:08 Target container is coated with TaC and wrapped with 3-Ta heat shields, not incl center block. TGHT and TBHT will be ramped up to 820A and 230A, respectively. Chamber pumped down over the weekend. IGP1 = 2.1e-7 Torr. HS cooling water valves opened; no leaks detected. TGHT max voltage = 18V, TBHT max voltage = 5V .... attempted to start stepping up manually. power supply not responding to epics controls for TBHT only...looking into problems now...  Monday, April 20, 2015, 16:06 Epics is working. Power supply connections unplugged/plugged back in. Everything working again. Tapped up manually to 40A. Waited ~1hr30 for vacuum to stabilize. IGP1 = 1.8e-6 Torr. Good vac = 3e-5 Torr. Bad vac = 4e-5 Torr. TGHT and TBHT will be ramped up to 820A and 230A, respectively. Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively.  Wednesday, April 22, 2015, 15:23 TGHT = 200A, 2.26V; TBHT = 117A, 1.58V IGP1 = 9.8e-6 Torr. Increasing auto-ramp to 0.4A/min and 0.2A/min for the TGHT and TBHT respectively.

 Thursday, April 23, 2015, 10:15

Vac at 2.e-6 Torr.  Increased TGHT ramping rate to 1.0A/min.  Current temperature at 1443C, TGHT at 641A, TBHT at 230A.

 Thursday, April 23, 2015, 15:02

Evap#2 window for the temp reader is now coated, so temp reading is not available.  (see attachment). 

TGHT has been at 820A/13.45V for almost 2 hours, will continue to heat at this current for a few more hours.  Will initiate the cooling process from home…  

 Thursday, April 23, 2015, 22:31

Target has been heated at 820A for about 9.5hrs.  Current vacuum at 4.7e-7 Torr.

Initiating cooling process at -2A/min for TGHT and -1A/min for TBHT.

Friday, April 24, 2015, 10:13  

Target has been cooled at 0A for about 5 hours.  Chamber is currently being vented and the target will be taken out for inspection.

Friday, April 24, 2015, 12:37  

The target was inspected.  

Some yellow crystals were form around the ends but they were easily removed this time.  

With both ends open during the sintering process and shorten the target length with 1cm space of both side, the target is looking a lot better.  

 No visible damage on the target surface.  

Inside, the channel has a clear pathway, and the discs are nicely aligned.  

End caps and Rh foils are inserted - It's ready for assembly.

See link for pics after the sintering process.

https://www.dropbox.com/sh/w5k4l3fezfat2cm/AAAyX67zyUPUVvN_WzEHFXM2a?dl=0

Friday, February 22, 2013, 15:49

The LP-SIS RFQ target container was previously coated with TaC and sintered up to ~1500C (TGHT @ 600A, TBHT @ 300A). 

The container is loaded with 325 discs of SiC, a total of 10.9cm in length. 

For this process,

TGHT will be ramped up to 600A and at the same time TBHT will go up to 300A.  No Ta-heat shield is used. 

The ramping rate is set to 0.2A/min.

The chamber is currently being pumped down. 

 Friday, March 01, 2013, 15:57

The target was further heated up to 650A TGHT and 300A TBHT for 4 hours yesterday; then it was cooled down.  

Some reactions on the target end (where the D-cap inserted) was observed.  

Yellow crystals on the D-cap was formed, just as we have seen before.  

Overall, the target looks good!  

See attachment#2 for the target production. 

More about the gasses analyst from the RGA later...  

 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, 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...

 Sunday, July 22, 2012, 20:30

The NiO target materials were loaded into the container today.  

Total discs = 500, (10 discs/pack) 

length (after loaded) = 9.0cm 

Target container is wrapped with Ta-heat shields, and will be removed after the sintering process. 

One regular end cap is inserted (with Ni-foil inserted as a divider).  The caps, however, are very loose (tried 2 caps and still loose).  Hopefully the thermo diffusion bonding will seal the cap... 

The other end is inserted with a D-cap for out-gassing proposes, and will be replaced with the regular end-cap after the process. 

(see attachment#1)

Sunday, July 22, 2012, 20:48 

The camber has been pumped down and currently IG1=1.3e-6 Torr.

The HS cooling water was turned on and no leaks were detected.  

TGHT and TBHT were stepped up to 50A. 

Auto-ramping is initiated at 0.2A/min for TGHT max = 250A, TBHT max = 230A. 

 Thursday, July 26, 2012, 23:31

TGHT and TBHT have reached to 250A (local @ 242A/2.88V) and 230A, respectively, and have stayed for ~4hrs (see attachment#2)  

Currently, IGP1 = 4.9e-7 Torr, IGP2 = 3.5e-7 Torr, CG1B = 13mTorr. 

Initiating auto-cool down at 2A/min.  

 Monday, July 30, 2012, 15:11

The chamber was vented and the target was removed.

There was significant condensation oily fluid coated Cu-heatshield lid and around the ionizer opening.

Overall, the target looks very good.  The NiO target material was nicely sintered.  No shrinkage or loose particles were observed (see attachment #3).

The endcap, however, was not properly fitted and it just fell off, (see attachment #4). 

Both ends of the target are currently opened; the expension tool for the endcap is in order and hopefully this will solve the problem.

The target is being stored in the fumehood

Thursday, August 08, 2013, 15:19

NiO target materials loaded into the container yesterday.

Total discs = 530, (5 discs/pack)

length [after loaded] = 9.0cm

Target container is wrapped with Ta-heat shields, and will be removed after sintering process.

No end caps were inserted.

The chamber has been pumped down and currently IG1 = 3.8x10-06 Torr.

The HS cooling water was turned on and no leaks were detected.

TGHT and TBHT have been stepped up to 50A.

Auto-ramping setting:

0.2A/min for TGHT max = 250A, TBHT max = 230A.

Good vacuum = 3.00e-05 Torr

Bad vacuum = 4.00e-05 Torr

**See attachment #1 for pictures of target pre-sintering

Laura Lambert wrote:

Thursday, August 08, 2013, 15:19 NiO target materials loaded into the container yesterday. Total discs = 530, (5 discs/pack) length [after loaded] = 9.0cm Target container is wrapped with Ta-heat shields, and will be removed after sintering process. No end caps were inserted. The chamber has been pumped down and currently IG1 = 3.8x10-06 Torr. The HS cooling water was turned on and no leaks were detected. TGHT and TBHT have been stepped up to 50A. Auto-ramping setting: 0.2A/min for TGHT max = 250A, TBHT max = 230A. Good vacuum = 3.00e-05 Torr Bad vacuum = 4.00e-05 Torr **See attachment #1 for pictures of target pre-sintering

 Thursday, August 08, 2013, 17:26

Pressure is stabilizing at ~2.2e-5 Torr.  TGHT/TBHT at 50A.

Initiated auto-ramping... 

Sunday, August 11, 2013, 21:30  

TGHT/TBHT have reached to 250A/230A.  Target have been heated over the weekend.  

Cooling down initiated; 2A/min.  

The chamber wil be vented in air tomorrow. 

 Monday, August 12, 2013, 18:01

The sinterring process is complete. 

The target is ready to be removed from the evaporator, and the endcaps will be inserted.

 Monday, July 31, 2017,  

Pellets previously pressed by Marla and Pauline. 

Pellets are placed inside a small graphite container.

Graphite container loaded with 5 pellets was loaded into Ta-boat previously coated with TaC.

Ta-boat is wrapped with 3 Ta heat shields.

Loaded in evaporator 2.

 Tuesday, August 01, 2017,

Chamber pumping down.

 Wednesday, August 02, 2017, 16:03

HS water valves were opened, no leaks were detected.

Current was tapped manually to 40 A.

After the stabilization of the vacuum auto ramping was set up to 0.5 A/min.

Up to a final set up point of 300 A.

Final desired temperature ~1700 C.

Marla Cervantes wrote:

Monday, July 31, 2017,   Pellets previously pressed by Marla and Pauline.  Pellets are placed inside a small graphite container. Graphite container loaded with 5 pellets was loaded into Ta-boat previously coated with TaC. Ta-boat is wrapped with 3 Ta heat shields. Loaded in evaporator 2.  Tuesday, August 01, 2017, Chamber pumping down.  Wednesday, August 02, 2017, 16:03 HS water valves were opened, no leaks were detected. Current was tapped manually to 40 A. After the stabilization of the vacuum auto ramping was set up to 0.5 A/min. Up to a final set up point of 300 A. Final desired temperature ~1700 C.

 Friday, August 04, 2017, 10:20

evap2 tripped twice yesterday.

1st trip) there was a power bump which caused a trip at ~4:20pm, this can be seen in the striptool image attached.

-TGHT spiked to zero, but immediately went back to the ~420A it was sitting at at the time.

-This did not initiate a full trip of everything, but a visual spike in the system can be seen

-Oddly this was not picked up in archives - happened so fast and must have been in the small time frame it was not picking up information

-Did TGHT actually drop to zero followed by then applying an immediate 420A?

-Or did it simple not register a reading due to power bump?

2nd trip) IGP1 stopped communicating at ~5:45pm, this can be seen in both the archives, striptool and evap2 control screenshot images attached

-IGP1 was fine, vacuum was good

-Registering good vacuum in epics - can see in screen shot vacuum was still good but IGP1 turned yellow as if turned off

-This resulted in TP followed by BV tripping off due to no longer getting a vacuum reading making the TP think there was a bad vacuum.

-Possible miscommunication with PLC?

-This is the same scenario that happened on mon - see elog i.d. 381

Will follow up when more information acquired...

Laura Lambert wrote:

Marla Cervantes wrote:  Monday, July 31, 2017,   Pellets previously pressed by Marla and Pauline.  Pellets are placed inside a small graphite container. Graphite container loaded with 5 pellets was loaded into Ta-boat previously coated with TaC. Ta-boat is wrapped with 3 Ta heat shields. Loaded in evaporator 2.  Tuesday, August 01, 2017, Chamber pumping down.  Wednesday, August 02, 2017, 16:03 HS water valves were opened, no leaks were detected. Current was tapped manually to 40 A. After the stabilization of the vacuum auto ramping was set up to 0.5 A/min. Up to a final set up point of 300 A. Final desired temperature ~1700 C.    Friday, August 04, 2017, 10:20 evap2 tripped twice yesterday. 1st trip) there was a power bump which caused a trip at ~4:20pm, this can be seen in the striptool image attached. -TGHT spiked to zero, but immediately went back to the ~420A it was sitting at at the time. -This did not initiate a full trip of everything, but a visual spike in the system can be seen -Oddly this was not picked up in archives - happened so fast and must have been in the small time frame it was not picking up information -Did TGHT actually drop to zero followed by then applying an immediate 420A? -Or did it simple not register a reading due to power bump? 2nd trip) IGP1 stopped communicating at ~5:45pm, this can be seen in both the archives, striptool and evap2 control screenshot images attached -IGP1 was fine, vacuum was good -Registering good vacuum in epics - can see in screen shot vacuum was still good but IGP1 turned yellow as if turned off -This resulted in TP followed by BV tripping off due to no longer getting a vacuum reading making the TP think there was a bad vacuum. -Possible miscommunication with PLC? -This is the same scenario that happened on mon - see elog i.d. 381 Will follow up when more information acquired...

 Friday, August 04, 2017, 14:05

Vented in air and transferred to glove box today.

Container did not break.

Some wires in PLC were not creating a good contact - could be problem re: IGP1 tripping off.

Wires replaced by Gelo.

Put back under vacuum with nothing loaded over weekend to see how things run...

 Wednesday, July 19, 2017, 13:44

Discs previously casted by Marla and Pauline and weighed. 

Discs are placed inside a small graphite container.

Graphite container with discs loaded with 30 discs was loaded into Ta-boat previously coated with TaC.

Ta-boat is wrapped with 3 Ta heat shields.

Loaded in evaporator 2.

Chamber currently pumping down.

Thursday, July 20, 2017, 16:07

 HS water valves were opened in the morning, no leaks were detected.

Perform water test to confirm paddle wheels are working well.

Current was tapped manually to 40 A.

Read out on meter confirmed paddle wheels are registering 

Tap back down to 20 A, tripped off system on purpose by closing HS water valves.

TGHT tripped off as expected.

Water flow test was good, initiating ramp up of samples.

Taped manually to 40 A.

After the stabilization of the vacuum auto ramping was set up to 0.2 A/min.

Up to a final set up point of 250 A.

Final desired temperature ~1800 C.

 Friday, July 21, 2017, 10:20

Final set up from July 20 was reached.

Current reading: 244.6 A.

Voltage reading: 3.82 V.

Temperature reached: 1105 C.

Final set up was change to 1500 A.

The temperature reached at 6 pm was 1936 C so the current  was decreased  to 488 A.

The final temperature after 30 min was 1800 C.

The set up stayed the same for the weekend.

 Monday, July 24, 2017, 13:06

Temperature reading in the morning was 1856 C.

TGHT: 487.87 A, 9.07 V

TGHT power supply: 

IGP1: 3.75e-7 Torr

IGP2: 3.51e-7 Torr

Started to ramp down at 1 A/min rate.

Initiating auto cooling at 1.0A/min for TGHT.

 Tuesday, July 25, 2017, 09:27

LaC2/C discs were taken off of evap2.

LaC2/C discs were brought in to glove box.

 Tuesday, May 07, 2013, 16:48

5 BeO pellets were made.  Each weights about 1.3 g (including org mass). 

A piece of Re foil (0.002" thick) is used as the under layer to protect the reaction between Be(g) and the Ta-boat.  (see Pictures)

Another layer of Ta-foil is used as the heat-shield to wrap around the Ta-boat.

The chamber was pumped down. 

TGHT will be ramped up to 600 A (~1360°C) at 0.2 A/min. The vacuum limit parameter was set for good vacuum at < 3.0e-5 Torr and bad vacuum at > 4.0e0-5 Torr.

The pressure, voltage and current will be closely monitored. 

If the Ta-boat survives, the TGHT will continue to ramp up to max 800 A (~1580°C).