Laura Lambert wrote:

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

 Wednesday, May 03, 2017, 16:07

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

IGP2 works again.

Will look into replacement ion gauge...

Laura Lambert wrote:

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

 Wednesday, May 03, 2017, 16:09

HS water valves opened, no leaks detected.

Tapped up manually to 40A.

Vacuum stable.

IGP1 = 3.6e-7 Torr

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

 Thursday, May 04, 2017, 08:41

Reached 300A, 230A 10hrs ago.

IGP1 = 1.5e-7 Torr

OMEGA = 1070C

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

 Thursday, May 04, 2017, 14:58

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

TGHT = 500A, 7.65V

IGP1 = 9.3e-7 Torr

OMEGA = 1450C

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

 Friday, May 05, 2017, 08:53

TGHT = 550A, 8.64V

IGP1 = 2.8e-7 Torr

OMEGA = 1560C

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

 Friday, May 05, 2017, 11:09

TGHT = 600A, 9.58V

IGP1 = 7.3e-7 Torr

OMEGA = 1670C

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

 Friday, May 05, 2017, 12:05

TGHT = 625A, 10.05V

IGP1 = 9.9e-7 Torr

OMEGA = 1710C

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

 Friday, May 05, 2017, 13:13

TGHT = 650A, 10.57V

IGP1 = 1.1e-6 Torr

OMEGA  = 1740C

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

Tapping up manually to 1800C

 Friday, May 05, 2017, 13:42

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

TGHT = 680A, 11.08V

IGP1 = 1.6e-6 Torr

OMEGA = 1795C

MIKRON = 1795C

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

Currently sitting 10A above predicted required current.

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

Window remains clear and uncoated.

Tapped up to TGHT = 685A, 11.2V

OMEGA = 1795C

Will remain at this setpoint over the weekend.

 Monday, May 08, 2017, 08:59

TGHT = 685A, 11.08V

TBHT = 230A, 3.24V

IGP1 = 1.98e-7 Torr

OMEGA has lowered to 1342C

Evap2 sat at max setpoints over the wknd.

Will check window port before cooling...

*UPDATE ON TRIP-OFF*

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

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

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

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

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

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

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

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

 Tuesday, May 09, 2017, 09:16

TGHT = 685A, 11.04V

TGHT power supply = 686A, 11.31V

TBHT = 230A, 3.24V

TBHT power supply = 236A, 3.32V

IGP1 = 1.6e-7 Torr

IGP1 direct readout = 2.3e-7 mbar

IGP2 = 6.8e-8 Torr

IGP2 direct readout = 8.46e-8 Torr

Evap2 reached max setpoint friday afternoon.

Window clearly coated - see attached photo.

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

 Wednesday, May 10, 2017, 09:18

Vented in air and opened up this morning.

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

Target looks good! 

One sample disc removed for SEM.

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

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

Laura Lambert wrote:

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

 Wednesday, October 31, 2018, 19:35

Container is coated with TaC and wrapped with Ta heat-shield (3 layers)

Desired temp = 1900 C (expected TGHT ~445A/7.5V), TBHT will be set fixed at 230A (max).

Chamber is currently being pumped down

 Thursday, November 01, 2018, 10:31

Pressure at IGP1 9.44e-7 Torr. 

Tapped up TGHT and TBHT manually to 40 A

Thursday, November 01, 2018, 12:32

Waited ~1 hr for vacuum to stabilize.

IGP1 = 1.42e-6 Torr

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Initiating auto ramp for TGHT @ 1 A/min to a max setpoint of 350 A

Initiating auto ramp for TBHT @ 0.5 A/min to a max setpoint of 230 A

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

 Tapped manually to 445 A, Temperature 1896 C.

Friday, November 02, 2018, 07:35

TGHT 7.86 V 445.6 A

TBHT 3.22 V 233.3 A

IGP1 1e-6 Torr

Ramping down TGHT and TBHT to 0 A @ 2 A/min.  

Friday, November 02, 2018, 17:28

Monday, October 29, 2018, 12:39

Venting EVAP2, TaC coat sintering completed. 

 Friday, November 02, 2018, 17:33

A new LP-FEBIAD was coated and syntered (e-log 421 Evaporator_2) 

The container was loaded with an empty graphite insert.

Graphite insert mass = 24.1724 g

A current of 440 A TGHT and 230 A TBHT will be inputed to the container

EVAP2 currently pumping down

 Saturday, November 03, 2018, 08:04

IGP1 = 5.66e-7 Torr

Tapping manually to 40 A on TGHT and TBHT

Then auto/ramp wiill be set to 2 A/min on TGHT and 1 A/min on TBHT

Maximum temperature achieve 1802 C

 Tuesday, November 06, 2018, 14:49

Container has reduced and increased its temperature from ~1760 to 1802 C.

IGP1  3.44e-7 Torr

TGHT 441.7 A and 7.7 V

TBHT 233.2 A and 3.2 V

 Wednesday, November 07, 2018, 08:32

Temperature 1785 C

IGP1  2.90e-7 Torr

TGHT 441.38 A and 7.7 V

TBHT 233.2 A and 3.2 V

 Friday, November 09, 2018, 17:26

Temperature 1787 C

IGP1  2.12 -7 Torr

TGHT 442.03 A and 7.7 V

TBHT 233.06 A and 3.19 V

Tuesday, November 13, 2018, 14:13: Turbos, power supplies off. Prepare for venting. 

 Wednesday, January 15, 2014, 17:30

Target container is coated with TaC.  No Ta-heat shields are used.

TGHT will be ramped up to 580A at 0.2A/min. 

TBHT will be ramped up to 230A at 0.2A/min.  

 Chamber is currently being pumped.  Tomorrow, the HS water valve can be opened to test for leaks.  

Notes: 

If everything is fine, TGHT/TBHT can be stepped up to 30A-50A.  Watch for the vacuum; once it's stable the auto ramping program can be initiated.  

Once TGHT/TBHT reached above 200A, the ramping rate for TGHT can be increased up to 2A/min.  (This step is to speed up the process; however it's not mandatory) 

John Wong wrote:

Wednesday, January 15, 2014, 17:30 Target container is coated with TaC.  No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min.  TBHT will be ramped up to 230A at 0.2A/min.    Chamber is currently being pumped.  Tomorrow, the HS water valve can be opened to test for leaks.   Notes:  If everything is fine, TGHT/TBHT can be stepped up to 30A-50A.  Watch for the vacuum; once it's stable the auto ramping program can be initiated.   Once TGHT/TBHT reached above 200A, the ramping rate for TGHT can be increased up to 2A/min.  (This step is to speed up the process; however it's not mandatory)

 Thursday, January 16, 2014, 11:35

Chamber was pumped down overnight to 10-7 Torr. HS water valve was opened and no leak in vacuum was observed.

TGHT and TBHT were stepped up to 35A. Waited ~30min, current stabilized and vacuum starting to drop.

Initiating auto-ramping: Good Vac = 2.0e-5 Torr, Bad Vac = 3.0e-5 Torr.

Laura Lambert wrote:

John Wong wrote:  Wednesday, January 15, 2014, 17:30 Target container is coated with TaC.  No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min.  TBHT will be ramped up to 230A at 0.2A/min.    Chamber is currently being pumped.  Tomorrow, the HS water valve can be opened to test for leaks.   Notes:  If everything is fine, TGHT/TBHT can be stepped up to 30A-50A.  Watch for the vacuum; once it's stable the auto ramping program can be initiated.   Once TGHT/TBHT reached above 200A, the ramping rate for TGHT can be increased up to 2A/min.  (This step is to speed up the process; however it's not mandatory)     Thursday, January 16, 2014, 11:35 Chamber was pumped down overnight to 10-7 Torr. HS water valve was opened and no leak in vacuum was observed. TGHT and TBHT were stepped up to 35A. Waited ~30min, current stabilized and vacuum starting to drop. Initiating auto-ramping: Good Vac = 2.0e-5 Torr, Bad Vac = 3.0e-5 Torr.

 Friday, January 17, 2014, 09:28

TGHT/TBHT @ 300/200A.  TBHT voltage is limited at 3A.  

TGHT ramping rate increased to 2A/min.  Pressure @ 4.5e-7 Torr.  

John Wong wrote:

Laura Lambert wrote: John Wong wrote:  Wednesday, January 15, 2014, 17:30 Target container is coated with TaC.  No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min.  TBHT will be ramped up to 230A at 0.2A/min.    Chamber is currently being pumped.  Tomorrow, the HS water valve can be opened to test for leaks.   Notes:  If everything is fine, TGHT/TBHT can be stepped up to 30A-50A.  Watch for the vacuum; once it's stable the auto ramping program can be initiated.   Once TGHT/TBHT reached above 200A, the ramping rate for TGHT can be increased up to 2A/min.  (This step is to speed up the process; however it's not mandatory)     Thursday, January 16, 2014, 11:35 Chamber was pumped down overnight to 10-7 Torr. HS water valve was opened and no leak in vacuum was observed. TGHT and TBHT were stepped up to 35A. Waited ~30min, current stabilized and vacuum starting to drop. Initiating auto-ramping: Good Vac = 2.0e-5 Torr, Bad Vac = 3.0e-5 Torr.    Friday, January 17, 2014, 09:28 TGHT/TBHT @ 300/200A.  TBHT voltage is limited at 3A.   TGHT ramping rate increased to 2A/min.  Pressure @ 4.5e-7 Torr.

 Friday, January 17, 2014, 10:14

TBHT stopped at 200A with voltage limit sitting at 3V.

Aborted auto-ramp, changed the voltage limit to 5V and increased ramping rate to 2A/min. Re-started auto-ramp.

IGP1 @ 5.0e-7 Torr

Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote: John Wong wrote:  Wednesday, January 15, 2014, 17:30 Target container is coated with TaC.  No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min.  TBHT will be ramped up to 230A at 0.2A/min.    Chamber is currently being pumped.  Tomorrow, the HS water valve can be opened to test for leaks.   Notes:  If everything is fine, TGHT/TBHT can be stepped up to 30A-50A.  Watch for the vacuum; once it's stable the auto ramping program can be initiated.   Once TGHT/TBHT reached above 200A, the ramping rate for TGHT can be increased up to 2A/min.  (This step is to speed up the process; however it's not mandatory)     Thursday, January 16, 2014, 11:35 Chamber was pumped down overnight to 10-7 Torr. HS water valve was opened and no leak in vacuum was observed. TGHT and TBHT were stepped up to 35A. Waited ~30min, current stabilized and vacuum starting to drop. Initiating auto-ramping: Good Vac = 2.0e-5 Torr, Bad Vac = 3.0e-5 Torr.    Friday, January 17, 2014, 09:28 TGHT/TBHT @ 300/200A.  TBHT voltage is limited at 3A.   TGHT ramping rate increased to 2A/min.  Pressure @ 4.5e-7 Torr.      Friday, January 17, 2014, 10:14 TBHT stopped at 200A with voltage limit sitting at 3V. Aborted auto-ramp, changed the voltage limit to 5V and increased ramping rate to 2A/min. Re-started auto-ramp. IGP1 @ 5.0e-7 Torr

 Friday, January 17, 2014, 12:45

TGHT voltage limiting at 9.9V, and  current stayed at 560A.  Increased the TGHT voltage to 10.5V and continued ramping the heater up.

TGHT/TBHT stabilized at 580A (~10V) and 230A(3.6V). 

Pressure at 1.03e-6 Torr and coming down... 

Target will be heated until 5pm (4hrs) before cooling down at the ramping rate of 2A/min. 

Chamber will be vented in air, next week.

 Friday, January 17, 2014, 16:51

Auto-cooling initiated at 2A/min.

Vac @ 5.3e-7 Torr.

John Wong wrote:

Laura Lambert wrote: John Wong wrote: Laura Lambert wrote: John Wong wrote:  Wednesday, January 15, 2014, 17:30 Target container is coated with TaC.  No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min.  TBHT will be ramped up to 230A at 0.2A/min.    Chamber is currently being pumped.  Tomorrow, the HS water valve can be opened to test for leaks.   Notes:  If everything is fine, TGHT/TBHT can be stepped up to 30A-50A.  Watch for the vacuum; once it's stable the auto ramping program can be initiated.   Once TGHT/TBHT reached above 200A, the ramping rate for TGHT can be increased up to 2A/min.  (This step is to speed up the process; however it's not mandatory)     Thursday, January 16, 2014, 11:35 Chamber was pumped down overnight to 10-7 Torr. HS water valve was opened and no leak in vacuum was observed. TGHT and TBHT were stepped up to 35A. Waited ~30min, current stabilized and vacuum starting to drop. Initiating auto-ramping: Good Vac = 2.0e-5 Torr, Bad Vac = 3.0e-5 Torr.    Friday, January 17, 2014, 09:28 TGHT/TBHT @ 300/200A.  TBHT voltage is limited at 3A.   TGHT ramping rate increased to 2A/min.  Pressure @ 4.5e-7 Torr.      Friday, January 17, 2014, 10:14 TBHT stopped at 200A with voltage limit sitting at 3V. Aborted auto-ramp, changed the voltage limit to 5V and increased ramping rate to 2A/min. Re-started auto-ramp. IGP1 @ 5.0e-7 Torr  Friday, January 17, 2014, 12:45 TGHT voltage limiting at 9.9V, and  current stayed at 560A.  Increased the TGHT voltage to 10.5V and continued ramping the heater up. TGHT/TBHT stabilized at 850A (~10V) and 230A(3.6V).  Pressure at 1.03e-6 Torr and coming down...  Target will be heated until 5pm (4hrs) before cooling down at the ramping rate of 2A/min.  Chamber will be vented in air, next week.  Friday, January 17, 2014, 16:51 Auto-cooling initiated at 2A/min. Vac @ 5.3e-7 Torr.

Monday, April 08, 2013, 17:39

Target container is coated with TaC; the container will be used for the UCx#6 target. 

No Ta-heat shields are used.

For the sintering process:

TGHT will be ramped up to 580A at 0.2A/min

TBHT will be ramped up to 230A at 0.2A/min

Chamber has been pumped down.  HS cooling H2O valve opened; no leaks have detected.

Thursday, April 11, 2013, 14:35 

Target and tube heaters have reached to optimum.

Auto-cooling initiated...

 Friday, April 12, 2013, 11:17

P/S off.  Chamber vented. 

Done!

Wednesday, August 22, 2012, 17:25

Note:  LP-FEBIAD target container ( W.O#37918-3) was coated with TaC and sintered on July 19 for UCx#5 target.  Then, a last minute request from the Sci Dev. to run the UCx#5 in LP-SIS. 

The target container was coated with TaC  (Using IR heat lamp to speed the drying time)

It's wrapped with 3 layers of Ta as the heat-shield, including the backblock.

TGHT will be ramped up to 580A at 0.5A/min.

TBHT will be ramped up to 230A at 0.5A/min.

Chamber is currently being pumped down.

 Wednesday, August 22, 2012, 18:27

Chamber was pumped down to 5.4e-6 Torr; the HS cooling water valve was opened and no leaks were detected.

Stepped up TGHT/TBHT to 20A.

Initiated auto-ramping...

 Friday, August 24, 2012, 00:21

TGHT/TBHT have reached to 580A/230A, respectively, and have remained at the currents for ~10hrs.

Current, IG1 is at 9.3e-7 torr.  The sintering process is done.

Initiating auto-cool down at 2A/min.

 Friday, August 24, 2012, 13:31

TGHT & TBHT power supplies are off.

The chamber is vented.

Wednesday, October 10, 2012, 16:35

Target container is coated with TaC.  No Ta-heat shields are used.

TGHT will be ramped up to 580A at 0.2A/min.

TBHT will be ramped up to 230A at 0.2A/min.

Chamber is currently being pumped down

 Wednesday, October 10, 2012, 17:31

Chamber was pumped down to mid 10-6 Torr.  HS water valve was opened and no leak in vacuum was observed.

TGHT and TBHT were stepped up to 30A.  Everything seems fine...

Initiated auto-ramping:  Good vac = 2.0e-5 torr, Bad Vac = 3.0e-5 Torr. 

 Thursday, October 11, 2012, 10:35

TBHT has reached to 230A, 3.52V. 

TGHT has reached to 232A.  Vacuum is stabilizing at 8.0e-7 Torr, BP at 19 mTorr. 

Increased TGHT ramping rate to 2.0A/min. 

 Thursday, October 11, 2012, 14:55

TGHT reached to 580A/9.95V, local 575A/10.03V. 

TGHT at 230A/3.62V

Local target container temperature measured at ~1430C, central block at ~1220C

IGP1 currently at 1.68e-6 Torr. 

Heaters will be remained on for another 2 hours or so before auto-cooling is initiated.

 Thursday, October 11, 2012, 17:49

Target container has been heated for over 4 hrs.

IGP1 @ 1.10e-6 Torr, BP @ 18mTorr

Auto-cooling initiated, rate @ 2A/min.

 Friday, October 12, 2012, 10:02

TBHT/TGHT have reached to zero current. 

P/S off.

Venting chamber..

see attachment#1: striptool archiver

 Tuesday, October 16, 2012, 10:35

Container looks good.  It will be used for TiC#3

Tuesday, October 16, 2012, 14:12

Target is filled with 360 discs of TiC (with 1 mole of graphite) backed on C-grv foil.  

No Ta heat-shields wrapped around the container.

One regular end-cap is inserted and expanded.  The other end is inserted with a D-cap for out-gassing.

Re ionizer foil is inserted.

TGHT will be ramped up to 580A, TBHT to 230A; ramping rate at 0.2A/min.

Chamber is currently being pumped down...

 Tuesday, October 16, 2012, 16:11

HS water valve is opened.  No leaks is detected.

Vacuum is coming down steadily.  IGP1 currently at 1.7e-5 Torr.

 Wednesday, October 17, 2012, 11:41

The chamber was pumped down overnight.  IGP1 reads at 5.8e-7 Torr.

Both TGHT & TBHT were stepped up to 30A. P/S OK! 

Initiated auto-ramping...

Monday, October 22, 2012, 10:58

TGHT and TBHT have reached to 580A & 230A, respectively (see attachment#1).

IGP1 currently at 6.27e-6 Torr.  BP@20mTorr.

Currents will remain at max for another 3 hours. 

Local temperature measured at 1500C (container surface), 1300C (center block)

 Monday, October 22, 2012, 17:27

Auto cooling initiated.

 Tuesday, October 23, 2012, 17:54

TGHT & TBHT are at 0A.  P/S & pumps off. 

The chamber will be vented, and the target will be taken out for inspections.

 Friday, January 31, 2014, 11:28

Target container is coated with TaC.

The container is wrapped with 3 x Ta heat-shield.

Chamber was pumped down to 1.9e-7 Torr.

HS water valves were opened, no leak detected.

TGHT and TBHT were stepped up to 35A. Waited ~20min, current stabilized and vacuum starting to drop.

TGHT will be ramped up to 580A at 0.2A/min, max voltage = 11.05V.

TBHT will be ramped up to 230A at 0.2A/min, max volatge = 5V.

Initiating auto-ramping: Good Vac = 3.0e-5 Torr, Bad Vac = 4.0e-5 Torr.

 Monday, February 03, 2014, 10:21

TGHT reached 580A pver the weekend.

TBHT sitting at 1.4A, checked archive: never went over 1.6A. Aborted auto-ramp, re-starting auto ramp process for TBHT.

IGP1 = 1.6e-7 Torr.

 Monday, February 03, 2014, 15:23

TBHT running smoothly, must have been and electrical problem.

TBHT currently at 85A, vacuum has not changed, increasing TBHT auto-ramp to 2.0A/min

 Tuesday, February 04, 2014, 10:10

TBHT reached 230A yesterday pm. Measured temp this morning at 1800C.

Initiated TGHT/TBHT auto-cooling at 2.0A/min.

 Wednesday, February 05, 2014, 11:33

Chamber cooled down overnight, vented and opened up this morning.

Smooth run! Container fully sintered.

Wednesday, August 06, 2014, 15:59

Target consists of 400 Ta discs. 

Total packed length 4.5cm

Total mass 47.490g.

Re foil inserted.

Wednesday, August 06, 2014, 16:07

Chamber is currently being pumped down.

No Ta heat-shield wrapped (Want to check the temperature without it) 

One end-cap inserted on left (wrt ionizer into the page).

TGHT and TBHT will be ramped up to 820A/230A at 2A/min.

 Wednesday, August 06, 2014, 18:07

Vacuum at 2.3e-6 Torr.  HS water valve opened.  No leaks.

Initiated auto-ramping.

 Thursday, August 07, 2014, 11:39

Target has been heated for 11hrs at TGHT/TBHT = 820A/230A.

Temperature measured with pyrometer:

Target leg = 1600C + (250 correction for e=0.25) = 1850C

Inside target material = dark, temp can't be measured.

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

John Wong wrote:

Wednesday, August 06, 2014, 15:59 Target consists of 400 Ta discs.  Total packed length 4.5cm Total mass 47.490g. Re foil inserted. Wednesday, August 06, 2014, 16:07 Chamber is currently being pumped down. No Ta heat-shield wrapped (Want to check the temperature without it)  One end-cap inserted on left (wrt ionizer into the page). TGHT and TBHT will be ramped up to 820A/230A at 2A/min.  Wednesday, August 06, 2014, 18:07 Vacuum at 2.3e-6 Torr.  HS water valve opened.  No leaks. Initiated auto-ramping.  Thursday, August 07, 2014, 11:39 Target has been heated for 11hrs at TGHT/TBHT = 820A/230A. Temperature measured with pyrometer: Target leg = 1600C + (250 correction for e=0.25) = 1850C Inside target material = dark, temp can't be measured. Cooling down at 2A/min for TGHT and 1A/min TBHT.

 Friday, August 08, 2014, 15:14

Vented in air and opened up up this morning.

Endcaps inserted and expanded.

Rh foil and salts added.

 Tuesday, February 11, 2014, 13:43

Target container is coated with TaC and wrapped with 3-Ta heat shields.

TGHT and TBHT will be ramped up to 820A and 300A, respectively.

Ramping rate set to 0.2A/min.

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

Chamber currently being pumped down...

 Tuesday, February 11, 2014, 16:33

Chamber pumped down to 2e-6 Torr.

HS cooling water valves opened; no leaks detected.

Will step up in the a.m.

 Wednesday, February 12, 2014, 11:41

IGP1 = 1.5e-7 Torr

TGHT max voltage = 17.05V, TBHT max voltage = 5V

Stepped TGHT and TBHT up to 35A

Waited 1hr15 before vacuum stabilized/ started to drop.

Initiating auto-ramping.

 Thursday, February 13, 2014, 10:19

TBHT and TGHT have both reached 300A

IGP1 = 2.4e-7 Torr.

Increasing TGHT auto-ramp to 2.0A/min

 Friday, February 14, 2014, 08:58

TGHT reached 820A yesterday afternoon. Measured internal temp this morning at 1300C.

Initiated TGHT auto-cooling at 2.0A/min and TBHT at 1.0A/min.

IGP1 = 3.2e-7 Torr.

 Monday, February 17, 2014, 12:02

Cooled down friday. Vented this morning.

Container fully sintered, smooth run!

 Friday, March 21, 2014, 16:09

Target container is loaded with 360 Discs of TiC.  

Target length = 11.7cm.  

Total green mass = 40.945g 

Container is wrapped with 3 Ta-heat shields, and have been pumped down in the chamber. 

For the sintering process: 

TGHT ramp up to 820A, and TGHT to 300A at 0.1A/min. 

Friday, March 21, 2014, 16:15

TGHT/TBHT were manually stepped up to 40A.  

Vac stabilizes at 1.7e-6 Torr.  

Initiate auto-ramping...