Tuesday, June 17, 2014, 13:20, Laura Lambert, Empty, 39530-8, HP-FEBIAD, Done, Sintering TaC coating container for SiC#30 part 2
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Tuesday, June 17, 2014, 13:11
Target container is coated with TaC.
Container is wrapped with 3x Ta-heat shields.
Currently being pumped down.
For sintering process:
TGHT and TBHT will be ramped up to 820A and 300A respectively at 0.1A/min
Tuesday, June 17, 2014, 14:22
HS water cooling valves opened, no leaks detected.
IGP1 @1.8e-6 Torr
TGHT max = 820A/ 17V
TBHT max = 300A/ 5V
Stepped up manually to 40A, waited ~20min, vacuum stable.
Initiating auto-ramp @ 1.0A/min
Wednesday, June 18, 2014, 11:24
TGHT and TBHT reached their respective 820A and 300A last night.
Internal temp measured from side of EVAP2 with mikron = 1830C
IGP1 = 7.6e-7 Torr
Initiating auto-cool down process at 2.0A/min and 1.0A/min for TGHT and TBHT respectively
vented and opened this morning.
smooth run 
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Friday, June 20, 2014, 12:01, Laura Lambert, SiC, 39530-8, HP-FEBIAD, In progress, Conditioning SiC#31 target
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Friday, June 20, 2014, 11:14
Made from batch's: oct 23/2013, oct 31/2013 and june 2012
Total number of foils: 515 discs
Total mass of materials [incl graphite foils]: 64.7224g
Total length packed: 17.8cm
Container is wrapped with 3x Ta-heat shields.
Currently being pumped down.
Friday, June 20, 2014, 14:56
HS cooling water valves opened, no leaks detected.
IGP1 = 6.2e-6 Torr
TGHT max = 820A/ 17V
TBHT max = 300A/ 5V
Stepping up manually to 40A
Friday, June 20, 2014, 16:04
IGP1 = 8e-6 Torr
Slowly stepped up to 35A manually.
Vacuum has stabilized.
Initiating auto-ramp at 0.1A/min
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Friday, June 20, 2014, 16:22, John Wong, SiC, 39530-8, HP-FEBIAD, In progress, Conditioning SiC#31 target
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Laura Lambert wrote: |
Friday, June 20, 2014, 11:14
Total number of foils: 515 discs
Total mass of materials [incl graphite foils]: 64.7224g
Total length packed: 17.8cm
Container is wrapped with 3x Ta-heat shields.
Currently being pumped down.
Friday, June 20, 2014, 14:56
HS cooling water valves opened, no leaks detected.
IGP1 = 6.2e-6 Torr
TGHT max = 820A/ 17V
TBHT max = 300A/ 5V
Stepping up manually to 40A
Friday, June 20, 2014, 16:04
IGP1 = 8e-6 Torr
Slowly stepped up to 35A manually.
Vacuum has stabilized.
Initiating auto-ramp at 0.1A/min
|
Friday, June 20, 2014, 16:16
Changing the heating current...
From the previous SiC targets, TGHT was ramped up to 800A and yellow crystals were found; the end caps and target legs were also found broken (see my iPad). This might be too hot for the Ta-boat to handle the sintering process.
For this process,
TGHT will ramp up to 600A and TBHT to 230A over the weekend.
Then, the temperature will be measured. The sintering temperature of SiC is ~1800 - 2000C.
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Monday, June 23, 2014, 09:47, Laura Lambert, SiC, 39530-8, HP-FEBIAD, In progress, Conditioning SiC#31 target
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John Wong wrote: |
Laura Lambert wrote: |
Friday, June 20, 2014, 11:14
Total number of foils: 515 discs
Total mass of materials [incl graphite foils]: 64.7224g
Total length packed: 17.8cm
Container is wrapped with 3x Ta-heat shields.
Currently being pumped down.
Friday, June 20, 2014, 14:56
HS cooling water valves opened, no leaks detected.
IGP1 = 6.2e-6 Torr
TGHT max = 820A/ 17V
TBHT max = 300A/ 5V
Stepping up manually to 40A
Friday, June 20, 2014, 16:04
IGP1 = 8e-6 Torr
Slowly stepped up to 35A manually.
Vacuum has stabilized.
Initiating auto-ramp at 0.1A/min
|
Friday, June 20, 2014, 16:16
Changing the heating current...
From the previous SiC targets, TGHT was ramped up to 800A and yellow crystals were found; the end caps and target legs were also found broken (see my iPad). This might be too hot for the Ta-boat to handle the sintering process.
For this process,
TGHT will ramp up to 600A and TBHT to 230A over the weekend.
Then, the temperature will be measured. The sintering temperature of SiC is ~1800 - 2000C.
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Monday, June 23, 2014, 09:45
IGP1 = 5e-6 Torr
TGHT and TBHT are at ~200A
Increasing ramping rate to 0.2A/min
Monday, June 23, 2014, 11:19
IGP1 = 6.9e-6 Torr
Increasing ramping rate to 2.0A/min
Monday, June 23, 2014, 12:09
JW: Pressure went up too fast... lower the TGHT ramping up rate to 1A/min.
Tuesday, June 24, 2014, 16:06
Increasing current with respect to temperature: See attached table
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Tuesday, June 24, 2014, 23:57, John Wong, SiC, 39530-8, HP-FEBIAD, In progress, Conditioning SiC#31 target
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Laura Lambert wrote: |
John Wong wrote: |
Laura Lambert wrote: |
Friday, June 20, 2014, 11:14
Total number of foils: 515 discs
Total mass of materials [incl graphite foils]: 64.7224g
Total length packed: 17.8cm
Container is wrapped with 3x Ta-heat shields.
Currently being pumped down.
Friday, June 20, 2014, 14:56
HS cooling water valves opened, no leaks detected.
IGP1 = 6.2e-6 Torr
TGHT max = 820A/ 17V
TBHT max = 300A/ 5V
Stepping up manually to 40A
Friday, June 20, 2014, 16:04
IGP1 = 8e-6 Torr
Slowly stepped up to 35A manually.
Vacuum has stabilized.
Initiating auto-ramp at 0.1A/min
|
Friday, June 20, 2014, 16:16
Changing the heating current...
From the previous SiC targets, TGHT was ramped up to 800A and yellow crystals were found; the end caps and target legs were also found broken (see my iPad). This might be too hot for the Ta-boat to handle the sintering process.
For this process,
TGHT will ramp up to 600A and TBHT to 230A over the weekend.
Then, the temperature will be measured. The sintering temperature of SiC is ~1800 - 2000C.
|
Monday, June 23, 2014, 09:45
IGP1 = 5e-6 Torr
TGHT and TBHT are at ~200A
Increasing ramping rate to 0.2A/min
Monday, June 23, 2014, 11:19
IGP1 = 6.9e-6 Torr
Increasing ramping rate to 2.0A/min
Monday, June 23, 2014, 12:09
JW: Pressure went up too fast... lower the TGHT ramping up rate to 1A/min.
Tuesday, June 24, 2014, 16:06
Increasing current with respect to temperature: See attached table
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Tuesday, June 24, 2014, 23:44
Target has been heated at 600A. Local temperature measured on the right leg = 1814C.
RGA/ striptool/temperature data can be found on this link:
https://www.dropbox.com/sh/69memvh6fthodoz/AABZiSKAR9njhbqO4sBATVbla
Something interesting was observed about the out gassing of this target - the right window was coated when the temperature rose above 1500C (on the right end, could be hotter inside?) - see attachment.
I suspect this is Si vapour deposited on the window when the target heater got closed to the sintering temperature for SiC (1800 - 2000C).
Once the chamber is vented, the coated window will be inspected and analyzed. More details later...
Initiate auto-cooling (slow cool down) TGHT 1A/min; TBHT 0.5/min. Chamber should be able for venting tomorrow afternoon.
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Thursday, October 23, 2014, 15:38, Laura Lambert, SiC, 39530-8, HP-FEBIAD, In progress, Testing the new OMEGA-IR2C on SiC#31 target 
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Thursday, October 23, 2014, 15:34
*See elog #142 for target description*
one endcap still in place, one removed for OMEGA-IR2C beam to reach material [see pic]
no heat shields
currently being pumped down
Friday, October 24, 2014, 11:34
EVAP2 pumped down overnight.
IGP1 = 7e-7 Torr
HS water valves opened, no leaks detected.
TGHT will be ramped up to 1400C
TBHT will be ramped up to 230A
Friday, October 24, 2014, 14:32
TBHT reached 230A, TGHT reached 1400C
Stepped TGHT up manually to 1600C; TGHT = 693A, 10.6V [see pic]
Friday, October 24, 2014, 15:58
TGHT = 760A, 12.07V [local read back] = setpoint.
epics readback TGHT = 754.8A, 11.76V
OMEGA = 1700C
Friday, October 24, 2014, 16:26
OMEGA = 1800C
epics readback TGHT = 828.7A, 13.15V
Friday, October 24, 2014, 16:34
OMEGA = 1900C
epics readback TGHT = 899A, 14.53V
Friday, October 24, 2014, 16:46
OMEGA = 2000C
epics readback TGHT = 967A, 15.8V
MIKRON target spot on SiC = 1650C, e = 0.97
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Tuesday, November 04, 2014, 16:21, John Wong, SiC, 39530-8, HP-FEBIAD, Done, Testing the new OMEGA-IR2C on SiC#31 target (NOT TO BE USED ONLINE)
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Laura Lambert wrote: |
Thursday, October 23, 2014, 15:34
*See elog #142 for target description*
one endcap still in place, one removed for OMEGA-IR2C beam to reach material [see pic]
no heat shields
currently being pumped down
Friday, October 24, 2014, 11:34
EVAP2 pumped down overnight.
IGP1 = 7e-7 Torr
HS water valves opened, no leaks detected.
TGHT will be ramped up to 1400C
TBHT will be ramped up to 230A
Friday, October 24, 2014, 14:32
TBHT reached 230A, TGHT reached 1400C
Stepped TGHT up manually to 1600C; TGHT = 693A, 10.6V [see pic]
Friday, October 24, 2014, 15:58
TGHT = 760A, 12.07V [local read back] = setpoint.
epics readback TGHT = 754.8A, 11.76V
OMEGA = 1700C
Friday, October 24, 2014, 16:26
OMEGA = 1800C
epics readback TGHT = 828.7A, 13.15V
Friday, October 24, 2014, 16:34
OMEGA = 1900C
epics readback TGHT = 899A, 14.53V
Friday, October 24, 2014, 16:46
OMEGA = 2000C
epics readback TGHT = 967A, 15.8V
MIKRON target spot on SiC = 1650C, e = 0.97
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Tuesday, November 04, 2014, 15:59
Target was heated up to 2000C and last for about 1.5 days before the right leg (ionizer points into the page) broke off.
Interesting discovery... The "yellowish" crystals are forming on the discs.
Suspecting a phase transformation of 6H (hexagonal/- alpha SiC (hexagonal) polytype to 3C(cubic) - beta SiC
More study needs to be done...
See elog # 168.
The leg of this target was repaired in the Machine shop.
THIS TARGET WILL NOT BE USED ONLINE - IT WILL BE USED FOR OFFLINE R&D PURPOSES.
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Thursday, August 08, 2013, 15:41, Laura Lambert, NiO, 39530-6, HP-FEBIAD, In progress, Sintering NiO # 2
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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
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Thursday, August 08, 2013, 17:28, John Wong, NiO, 39530-6, HP-FEBIAD, Done, Sintering NiO # 2
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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
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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.
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Tuesday, September 01, 2015, 17:20, John Wong, SiC, 39530-5, HP-FEBIAD, In progress, Sintering SiC#32
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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.
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Wednesday, September 02, 2015, 11:28, Laura Lambert, SiC, 39530-5, HP-FEBIAD, In progress, Sintering SiC#32
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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...
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Tuesday, September 08, 2015, 15:56, John Wong, SiC, 39530-5, HP-FEBIAD, In progress, Sintering SiC#32   
|
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.
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Wednesday, September 09, 2015, 18:24, John Wong, SiC, 39530-5, HP-FEBIAD, In progress, Re-conditioning SiC#32
|
John Wong wrote: |
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.
|
Wednesday, September 09, 2015, 17:39
Both end-caps are inserted onto the targets. The total mass (Target, Sintered SiC, end caps, 4x 19"round graphite foils) = 1453g.
Target is wrapped with 3 layers of heat shields.
The extraction electrode is wrapped with Ta-foil (see attachment). This is to trap any lose particle, if any.
Chamber is currently being pumped down, currently at 1.2e-5 Torr.
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Thursday, September 10, 2015, 09:58, Laura Lambert, SiC, 39530-5, HP-FEBIAD, In progress, Re-conditioning SiC#32
|
John Wong wrote: |
John Wong wrote: |
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.
|
Wednesday, September 09, 2015, 17:39
Both end-caps are inserted onto the targets. The total mass (Target, Sintered SiC, end caps, 4x 19"round graphite foils) = 1453g.
Target is wrapped with 3 layers of heat shields.
The extraction electrode is wrapped with Ta-foil (see attachment). This is to trap any lose particle, if any.
Chamber is currently being pumped down, currently at 1.2e-5 Torr.
|
Thursday, September 10, 2015, 09:55
HS water valves opened this morning, no leaks detected.
TGHT and TBHT tapped up manually to 35A.
IGP1 = 4.4e-7 Torr, vacuum stable.
Initiating auto-ramp at 1.0A/min and 0.5A/min for the TGHT and TBHT respectively with final setpoints of 600A and 230A.
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Thursday, September 10, 2015, 12:05, John Wong, SiC, 39530-5, HP-FEBIAD, Done, Re-conditioning SiC#32  
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Laura Lambert wrote: |
John Wong wrote: |
John Wong wrote: |
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.
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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...
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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.
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Wednesday, September 09, 2015, 17:39
Both end-caps are inserted onto the targets. The total mass (Target, Sintered SiC, end caps, 4x 19"round graphite foils) = 1453g.
Target is wrapped with 3 layers of heat shields.
The extraction electrode is wrapped with Ta-foil (see attachment). This is to trap any lose particle, if any.
Chamber is currently being pumped down, currently at 1.2e-5 Torr.
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Thursday, September 10, 2015, 09:55
HS water valves opened this morning, no leaks detected.
TGHT and TBHT tapped up manually to 35A.
IGP1 = 4.4e-7 Torr, vacuum stable.
Initiating auto-ramp at 1.0A/min and 0.5A/min for the TGHT and TBHT respectively with final setpoints of 600A and 230A.
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Thursday, September 10, 2015, 12:05
Changed TGHT to 2A/min and TGHT remains at 1A/min. Vacuum is table at 1.0e-6 Torr.
Friday, September 11, 2015, 11:34
TGHT was at 600A for almost 20 hours. Vac at 5.2 e-7 Torr. L-temp at 1490C, R-temp at 1685 (odd?). Using pyrometer to measure - Right end does seem brighter than the L end.
Continue to ramp up TGHT. Date is collected, will be posted later.
Friday, September 11, 2015, 11:53
L/R-temp measurements just don't seem normal.
Ramped up to 220A- temp reads L = 1522C, R = 1722C.
Ramping down TBHT doesn't change the temp.
Will cool TGHT/TBHT to 0A at 2A/min & 1A/min, respectively.
Will vent the chamber on Monday and inspect for any wrong.
Monday, September 14, 2015, 12:13
The target has taken out for inspection. No visible damage/problem was observed. The Ta-foil for loss particle capture only showed some heat marking but no material was trapped.
Target was weighted, no mass loss was observed.
Try expending the end caps to get a good thermal conductivity and will re-conditiong again.
Tuesday, September 15, 2015, 12:31
The end caps have been expended.
New Ta foils are used for the heat shields. The foils are cut in 3 1/4" x 12" and wrapped around the target. (see attachment). This is to see if the heat is evenly distributed.
Both omega optical lens are aligned properly.
Target is installed but the chamber is NOT yet being pumped down. Awaiting for the fume hood work in B2 level to be complete before the evaporator can be started.
Wednesday, September 16, 2015, 17:57
The work in the B2 level is done; the nuclear ventilation for the evaporators is now operational.
Chamber is currently being pumped down.
Thursday, September 17, 2015, 12:19
Chamber has been pump down overnight and pressure is currently at 5.8e-7 Torr.
HS valves are opened and no leaks are detected.
Ramping up TGHT/TBHT to 600A at 2A/min and 230A at 1A/min, respectively.
Thursday, September 17, 2015, 17:58
TGHT has reached to 600A/9.14V. Both the L and R temperatures are measured at 1710C and 1760C, respectively. At 600A, the temperature now is about 300C higher compared to that during the sintering process.
The difference in the temperature could be from Ta surface vs SiC surface. (But the 2-color IR temp reader shouldn't matter what color it's measuring?!! I don't know!)
Note:
Both temperature readings are fairly close. Could this be improved from the new Ta-foils? Possible!
It is still unclear what is the absolute temperature. A more systematic student needs to be done.
Using a thermocouple couple to measurement the endcaps at 600A and compared with the Omage reader may help to understand more.
After discussing with Friedhelm, it is decided to stay the target at 600A for the conditioning process.
Friday, September 18, 2015, 09:10
Target has been heated at 600A at stable temperature at 1716C (LS) and 1769C (RS), see attachment.
Friday, September 18, 2015, 11:45
Initiated cooling down at 2A/min for TGHT, and 1A/min TBHT.
Currently vac at 5.48e-7 Torr.
Thursday, September 24, 2015, 11:31
Target was inspected after the 2nd conditioning, up to 1700C at 600A for overnight.
No solid particle was observed that might have extracted from the ionizer tube.
The heat shields have been removed and the target is ready for assembly.
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Friday, December 16, 2016, 14:14, Laura Lambert, Ta, 39530-3, LP-FEBIAD, Done, Conditioning Ta FEBIAD target for shutdown tests 
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Friday, December 16, 2016, 14:08
Target consists of 470 discs.
Total packed length 3.4cm [exactly 7.8cm space on both sides]
Total mass 45.9091g [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
3x Ta Heat shields.
LP-FEBIAD container with large center block.
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
Friday, December 16, 2016, 14:32
HS water valves opened, no leaks detected
Tapped up manually to 35A
Vacuum stable, IGP1 = 2.1e-6 Torr
Initiating auto-ramp.
OMEGA slope = 0.98
Monday, December 19, 2016, 11:52
Tapped up manually to ~1900C [see attached excel for details on data collected - interesting temperature fluctuations]
Will remain at max setpoints for min 4hrs then auto-cool
Monday, December 19, 2016, 15:20
Target has remained at max setpoints for just over 4hrs
TGHT = 520A, 8.67V
OMEGA = 1820C
IGP1 = 5.2e-7 Torr
Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.
Tuesday, December 20, 2016, 11:52
Vented in air and opened up this morning.
Looks like the windows was coated in evap2, unsure if this was missed and coated before conditioning target or if this is from materials coming out during conditioning process...
Target looks good.
Endcaps inserted but not expanded.
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Wednesday, November 29, 2017, 16:18, Laura Lambert, Empty, 39530-3, LP-FEBIAD, Done, Temperature measurements for ARIEL
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Wednesday, November 29, 2017, 16:17
LP-FEBIAD loaded into evap2 today and currently pumping down.
Temperature measurements of the ionizer will be done by Fernando for ARIEL development.
Ta foil covering side holes on heat shield so no temp measurements can be done using OMEGA on side ports of evaporator as per request of Fernando
No Ta heat shields on container.
Final desired temperature of ionizer = 2000C
Thursday, November 30, 2017, 09:51
HS water valves opened, no leaks detected.
IGP1 = 2.1e-7 Torr
IGP2 = 1.7e-7 Torr
Tapped up to TGHT = 350A, 5.83V; TBHT = 230A, 3.31V
IGP1 = 6.3e-7 Torr
IGP2 = 3.7e-7 Torr
Will check temp measurements in lab after lunch before proceeding...
Friday, December 01, 2017, 11:04
Temperature measurements done.
Initiated auto-cool this morning.
TGHT cooling at 2.0A/min and TBHT at 1.0A/min.
Monday, December 04, 2017, 11:04
Removed from evap2 this morning. |
Wednesday, December 13, 2017, 10:55, Laura Lambert, Empty, 39530-3, LP-FEBIAD, Done, Temperature measurements for ARIEL
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Wednesday, December 13, 2017, 10:36
LP-FEBIAD loaded into evap2 this morning and pumped down.
Temperature measurements of the ionizer will be done by Fernando for ARIEL development.
Ta foil covering side holes on heat shield so no temp measurements can be done using OMEGA on side ports of evaporator as per request of Fernando
No Ta heat shields on container.
HS water valves opened, no leaks detected.
IGP1 = 2.3e-6 Torr
IGP2 = 1.7e-6 Torr
Tapped up to TGHT = 50A, 0.30V; TBHT = 50A, 0.59V
IGP1 = 1.8e-6 Torr
IGP2 = 1.4e-6 Torr
Initiating auto ramp for TGHT at 2.0A/min up to 350A and TBHT at 1.0A/min up to 210A
Wednesday, December 13, 2017, 14:53
IGP1 = 7.6e-7 Torr
IGP2 = 6.4e-7 Torr
TGHT = 350A, 5.85V
TBHT = 210A, 3.02V
TGHT and TBHT will be adjusted accordingly for temperature measurements...
Thursday, December 14, 2017, 09:16
IGP1 = 2.1e-7 Torr
IGP2 = 1.7e-7 Torr
TGHT = 385A, 6.80V
TBHT = 210A, 3.01V
Tapped up to TGHT = 400A, 7.11V
Stopped for temperature measurements.
Tapped up to TGHT = 450A, 8.20V
Friday, December 15, 2017, 09:50
IGP1 = 1.2e-7 Torr
IGP2 = 9.6e-8 Torr
TGHT = 350A, 5.82V
TBHT = 210A, 2.94V
Initiating auto-ramp to TGHT = 650A
Monday, December 18, 2017, 10:43
Temperature measurements done.
Initiated auto-cool.
TGHT cooling at 2.0A/min and TBHT at 1.0A/min.
Tuesday, December 19, 2017, 11:40
Vented in air and removed from evap2 today.
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Monday, February 19, 2018, 14:16, Laura Lambert, Empty, 39530-3, LP-FEBIAD, Done, Temperature measurements for ARIEL
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Monday, February 19, 2018, 13:39
LP-FEBIAD loaded into evap2 this morning and pumped down.
Temperature measurements of the ionizer will be done by Fernando for ARIEL development.
Ta foil covering side holes on heat shield so no temp measurements can be done using OMEGA on side ports of evaporator as per request of Fernando
No Ta heat shields on container.
HS water valves opened, no leaks detected.
IGP1 = 2.75e-6 Torr
IGP2 = 1.42e-6 Torr
Tapped up to TGHT = 50A, 0.53V; TBHT = 50A, 0.56V
IGP1 = 2.64e-6 Torr
IGP2 = 1.35e-6 Torr
Initiating auto ramp for TGHT at 2.0A/min up to 350A and TBHT at 1.0A/min up to 210A
Tuesday, February 20, 2018, 09:15
IGP1 = 6.9e-7 Torr
IGP2 = 3.8e-7 Torr
TGHT = 350A, 5.98V
TBHT = 210A, 3.02V
TGHT and TBHT will be adjusted accordingly for temperature measurements...
Tuesday, February 27, 2018, 14:55
Temperature measurements done.
Initiated auto-cool.
TGHT cooling at 2.0A/min and TBHT at 1.0A/min.
Wednesday, February 28, 2018, 10:39
Tuesday, December 19, 2017, 11:40
Vented in air and removed from evap2 today.
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Thursday, March 08, 2018, 11:05, Marla Cervantes, Empty, 39530-3, LP-FEBIAD, Done, Temperature measurements for ARIEL
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Friday, March 09, 2018, 11:03
LP-FEBIAD loaded into evap2 and pumped down.
Temperature measurements of the ionizer will be done by Fernando for ARIEL development.
Ta foil covering side holes on heat shield so no temp measurements can be done using OMEGA on side ports of evaporator as per request of Fernando
No Ta heat shields on container.
HS water valves opened, no leaks detected.
IGP1 = 1.72e-7 Torr
IGP2 = 1.36e-7 Torr
Tapped up to TGHT = 50 A, 0.54 V; TBHT = 50 A, 0.45 V
IGP1 = 1.8e-6 Torr
IGP2 = 1.4e-6 Torr
Initiating auto ramp for TGHT at 2.0A/min up to 310A and TBHT at 1.0A/min up to 210A
Monday, March 12, 2018, 10:16
IGP1 = 8.8e-8 Torr
IGP2 = 6.6e-8 Torr
TGHT = 310A, 5.06V
TBHT = 210A, 2.98 V
TGHT and TBHT will be adjusted accordingly for temperature measurements
Tuesday, March 13, 2018, 16:00
Temperature measurements done.
Initiated auto-cool.
TGHT cooling at 2.0A/min and TBHT at 1.0A/min.
Wednesday, March 14, 2018, 16:03
Removed from evap2. |
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