Thursday, April 27, 2017, 14:01

Target container contains 470 discs of SiC 

Target packed length = 16cm. 

Mass of SiC(green)  = 52.13g

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

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

Sintering temp = 1800C

Chamber is currently being pumped down. 

Friday, April 28, 2017, 13:06

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

Tapped up manually to 40A

Waited ~3hrs , vacuum stable.

IGP1 = 4.13e-6 Torr

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

TGHT max = 400A.  TBHT max at 230A. 

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

 Tuesday, May 02, 2017, 09:24

IGP1 = 2.34e-6 Torr

TBHT = 230A, 3.15V

TGHT = 298A, 3.96V

OMEGA = 1030C

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

 Tuesday, May 02, 2017, 13:20

IGP1 = 1.3e-5 Torr

TGHT = 400A, 5.6V

OMEGA = 1175C

Increasing max setpoint to 500A

Laura Lambert wrote:

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

  Wednesday, May 03, 2017, 13:33

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

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

TGHT = 500A, 7.77V

OMEGA = 1440C

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

Tapping the TGHT down made no difference to the vacuum.

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

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

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

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

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

Waiting on a new one from vacuum group...

See photos attached of striptool screenshots.

 Wednesday, May 03, 2017, 15:03

New TP control boxed installed.

Turbo pump turned on, everything pumped down.

Vacuum good, IGP1 = 6.92e-7 Torr.

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

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

Laura Lambert wrote:

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

 Wednesday, May 03, 2017, 16:07

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

IGP2 works again.

Will look into replacement ion gauge...

Laura Lambert wrote:

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

 Wednesday, May 03, 2017, 16:09

HS water valves opened, no leaks detected.

Tapped up manually to 40A.

Vacuum stable.

IGP1 = 3.6e-7 Torr

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

 Thursday, May 04, 2017, 08:41

Reached 300A, 230A 10hrs ago.

IGP1 = 1.5e-7 Torr

OMEGA = 1070C

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

 Thursday, May 04, 2017, 14:58

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

TGHT = 500A, 7.65V

IGP1 = 9.3e-7 Torr

OMEGA = 1450C

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

 Friday, May 05, 2017, 08:53

TGHT = 550A, 8.64V

IGP1 = 2.8e-7 Torr

OMEGA = 1560C

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

 Friday, May 05, 2017, 11:09

TGHT = 600A, 9.58V

IGP1 = 7.3e-7 Torr

OMEGA = 1670C

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

 Friday, May 05, 2017, 12:05

TGHT = 625A, 10.05V

IGP1 = 9.9e-7 Torr

OMEGA = 1710C

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

 Friday, May 05, 2017, 13:13

TGHT = 650A, 10.57V

IGP1 = 1.1e-6 Torr

OMEGA  = 1740C

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

Tapping up manually to 1800C

 Friday, May 05, 2017, 13:42

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

TGHT = 680A, 11.08V

IGP1 = 1.6e-6 Torr

OMEGA = 1795C

MIKRON = 1795C

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

Currently sitting 10A above predicted required current.

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

Window remains clear and uncoated.

Tapped up to TGHT = 685A, 11.2V

OMEGA = 1795C

Will remain at this setpoint over the weekend.

 Monday, May 08, 2017, 08:59

TGHT = 685A, 11.08V

TBHT = 230A, 3.24V

IGP1 = 1.98e-7 Torr

OMEGA has lowered to 1342C

Evap2 sat at max setpoints over the wknd.

Will check window port before cooling...

*UPDATE ON TRIP-OFF*

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

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

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

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

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

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

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

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

 Tuesday, May 09, 2017, 09:16

TGHT = 685A, 11.04V

TGHT power supply = 686A, 11.31V

TBHT = 230A, 3.24V

TBHT power supply = 236A, 3.32V

IGP1 = 1.6e-7 Torr

IGP1 direct readout = 2.3e-7 mbar

IGP2 = 6.8e-8 Torr

IGP2 direct readout = 8.46e-8 Torr

Evap2 reached max setpoint friday afternoon.

Window clearly coated - see attached photo.

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

 Wednesday, May 10, 2017, 09:18

Vented in air and opened up this morning.

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

Target looks good! 

One sample disc removed for SEM.

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

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

Laura Lambert wrote:

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

 Thursday, May 11, 2017, 11:25

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

Ion gauge has been replaced.

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

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

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

 Thursday, May 11, 2017, 11:21

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

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

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

Loaded into EVAP2 and currently pumping down.

 Thursday, May 11, 2017, 13:40

IGP1 = 1.85e-6 Torr.

HS water valves opened.

No leaks detected.

Tapped up manually to 35A.

Vacuum stable.

IGP1 = 3.2e-6 Torr

IGP2 = 4.2e-6 Torr

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

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

OMEGA slope = 0.98

 Friday, May 12, 2017, 07:57

IGP1 = 4.3e-7 Torr.

IGP2 = 4.4e-7 Torr

TGHT = 233A, 2.8V

TBHT = 130A, 1.6V

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

 Friday, May 12, 2017, 08:54

Comparing direct readouts with epics:

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

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

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

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

 Friday, May 12, 2017, 10:28

IGP1 = 1.07e-6 Torr

IGP2 = 1.15e-6 Torr

TGHT = 450A, 6.37V

TBHT = 230A, 3.21V

OMEGA = 1197C

Increasing max setpoint of TGHT = 700A

 Friday, May 12, 2017, 13:06

IGP1 = 2.4e-6 Torr

IGP2 = 2.5e-6 Torr

TGHT = 696A, 11.21V

TBHT = 233A, 3.26V

OMEGA = 1758C

Increasing max setpoint of TGHT = 800A

 Friday, May 12, 2017, 13:32

TGHT maxed out at 715A but continued ramping.

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

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

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

 Friday, May 12, 2017, 14:45

Container has reached max setpoint of ~1900C

TGHT setpoint = 775A

TGHT = 769A, 12.54V

TBHT = 233A, 3.28V

IGP1 = 2.94e-6 Torr

IGP2 = 2.99e-6 Torr

OMEGA = 1912C

Will remain at max setpoint over weekend.

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

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

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

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

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

Monday, May 15, 2017, 13:10

Vented in air and taken out this a.m.

Target container looks good. 

Fully sintered coating.

 Wednesday, May 10, 2017, 16:05

Loaded.

HS water valves opened, no leaks detected.

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

Laura Lambert wrote:

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

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

Anders Mjos wrote:

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

 Thursday, May 11, 2017, 10:51

vented in air and opened it up this morning.

Heat shield looks good!

 Monday, May 08, 2017, 10:05

Turbo pump control box died last week.

Replaced with a new one.

Thursday, April 20, 2017, 12:38

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

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

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

Est. TGHT 480A.

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

Chamber is currently being pumped down.

 Thursday, April 20, 2017, 14:28

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

 Friday, April 21, 2017, 10:56

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

Tapping up TGHT

 Friday, April 21, 2017, 12:32

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

 Friday, April 21, 2017, 15:38

TGHT dropped slightly, no coating on windows. 

Checked with Mikron, agreed with the dropped temp. 

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

 Wednesday, April 26, 2017, 17:06

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

Cooling down TGHT at 1A/min.

 Thursday, April 13, 2017, 12:01

Pellets made this morning and weighed.

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

Boat is wrapped with 3x Ta heat shields.

Loaded into evap2.

Chamber currently pumping down.

 Tuesday, April 18, 2017, 13:53

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

Tapped up manually to 100A, 1.28V

Vacuum stable.

IGP1 = 3.63e-6 Torr.

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

Final desired temperature of 1100C

 Tuesday, April 18, 2017, 14:57

TGHT = 150A, 2.08V

Still no temperature reading on OMEGA.

Vacuum stable, IGP1 = 1.16e-6 Torr.

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

 Tuesday, April 18, 2017, 15:56

TGHT = 200A, 2.91V

OMEGA = 990C

IGP1 = 8.59e-7 Torr

Tapping up manually to 1100C...

 Wednesday, April 19, 2017, 08:34

TGHT = 235A, 3.47V

OMEGA = 1090C

IGP1 = 1.6e-7 Torr.

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

Intitiating auto-cool at 2.0A/min

 Thursday, April 20, 2017, 08:40

Vented in air and taken out yesterday.

Pellets look good.

No obvious colour change.

 Wednesday, April 05, 2017, 15:36

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

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

No ends to target boat

Installed in evap2 and pumping down now...

Laura Lambert wrote:

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

 Thursday, April 06, 2017, 08:56

Problems with IGP2

Won't turn on, has low voltage output.

See screenshot attached.

Laura Lambert wrote:

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

 Thursday, April 06, 2017, 11:12

Turns out it was just a bad connection.

See attached photos.

Laura Lambert wrote:

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

Thursday, April 06, 2017, 13:16

HS water valves opened, no leaks detected.

Tapped up manually to 35A

Waited almost 2hrs

IGP1 = 9.9e-7 Torr

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

Final desired temperature = 1900C

OMEGA slope = 0.98

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

 Monday, April 10, 2017, 09:26

IGP1 = 1.79e-7 Torr

TGHT = 400A, 6.47V

OMEGA = 1505C

Tapping up manually to 1900C...

 Monday, April 10, 2017, 11:46

TGHT tripped off at 410A, ~1530C

Water is still on and good flow.

Vacuum was stable ~1.8e-7 Torr.

No power trips according to controls.

Not sure of reasoning behind trip.

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

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

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

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

 Monday, April 10, 2017, 13:13

Vacuum looks good.

IGP1 = 1.1e-7 Torr

TGHT = 127A, 1.30V

Increasing ramping rate to 2.0A/min

 Monday, April 10, 2017, 16:08

IGP1 = 1.5e-7 Torr

TGHT = 400A, 6.24V

OMEGA = 1510V

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

 Wednesday, April 12, 2017, 11:06

IGP1 = 2.96e-7 Torr

TGHT = 555A, 9.74V

OMEGA = 1935C

Has remained at max setpoints overnight.

Initiating auto-cool at 2.0A/min

 Thursday, April 13, 2017, 11:59

vented in air and opened up this morning.

container looks good.

see photo attached.

Friday, March 31, 2017, 12:21

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

Chamber is pumping down.

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

 Friday, March 31, 2017, 16:31

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

 Saturday, April 01, 2017, 12:30

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

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

 Saturday, April 01, 2017, 13:52

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

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

Pressure coming down (see attachment 2)

Hold temp for several days.

 Saturday, April 01, 2017, 17:22

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

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

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

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

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

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

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

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

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

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

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

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

Ramping down

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

Friday, March 10, 2017, 17:29

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

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

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

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

 Saturday, March 11, 2017, 11:58

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

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

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

Will remain at the current.  Continue monitoring..

 Monday, March 13, 2017, 01:14

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

Initiated cooling at 1A/min. 

Next, Materials inspection.

 Monday, March 13, 2017, 11:24

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

Tuesday, February 21, 2017, 15:19

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

Cleaned ionizer tube with acetone, no coating inside ionizer tube

Wrapped with 3 x Ta heat shields, incl center block

Currently pumping down in evap2

OMEGA slope = 0.98

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

 Wednesday, February 22, 2017, 09:41

HS water valves opened, no leaks detected.

Tapped up manually to 35A

Waited ~45min

Vacuum stable.

IGP1 = 1.2e-6 Torr

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

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

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

Friday, February 24, 2017 by Anders

Continue manually to 1900 C

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

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

Sunday, February 26, 2017 by Anders

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

Lab closed for weekend. No access to temp reading.

 Monday, February 27, 2017, 16:12

Tapped up manually to 1900C this morning.

TGHT = 490A, 8.14V

TBHT = 230A, 2.98V

MIKRON = 1911C

OMEGA = 1904C

evap2 has remained at max setpoints for ~6hrs

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

 Tuesday, February 28, 2017, 11:57

Container finished sintering.

Vented in air and opened up this morning.

Container looks good 

 Friday, February 03, 2017, 14:17

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

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

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

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

Chamber is currently being pumped down.

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

OMEGA slope = 0.98

 Monday, February 06, 2017, 09:29

Power outage this weekend and evap2 tripped off.

Re-pumping down now...

 Tuesday, February 07, 2017, 08:54

HS water valves opened, no leaks detected.

IGP1 = 1.9e-7 Torr

Tapped up manually to 35A

Vacuum stable.

IGP1 = 2.0e-7 Torr

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

Final desired temperature = 1800C

 Wednesday, February 08, 2017, 09:52

IGP1 = 2.98e-7 Torr

TGHT = 325A, 3.5V

Vacuum stable.

Increasing ramping rate to 1.0A/min

 Wednesday, February 08, 2017, 11:46

IGP1 = 6.3e-7 Torr

TGHT = 433A, 4.89V

Increasing max setpoint to TGHT = 500A

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

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

 Wednesday, February 08, 2017, 16:03

IGP1 = 4e-7 Torr

TGHT = 500A, 5.75V

OMEGA still not reading

Initiating auto-cool at -2A/min

Will update elog with more details tomorrow

 Thursday, February 09, 2017, 10:52

Evap2 was cooled down and opened up this morning.

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

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

A lot of power was being lost into the heatshield.

See photos attached of target boat sitting at 500A.

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

Laura Lambert wrote:

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

 Tuesday, February 14, 2017, 15:43

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

Laura Lambert wrote:

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

 Tuesday, February 14, 2017, 15:44

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

HS water valves opened, no leaks detected.

Tapped up manually to 35A

Vacuum stable.

IGP1 = 3.5e-6 Torr

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

Final desired temperature = 1800C

 Wednesday, February 15, 2017, 10:24

IGP1 = 7.2e-7 Torr

TGHT = 260A, 3.95V

OMEGA = 1158C

Vacuum stable.

Increasing ramping rate to 1.0A/min.

 Wednesday, February 15, 2017, 13:02

IGP1 = 2.0e-6 Torr

TGHT = 400A, 6.67V

OMEGA = 1530C

Increasing final setpoint to 450A

 Wednesday, February 15, 2017, 13:55

IGP1 = 2.5e-6 Torr

TGHT =450A, 7.7V

OMEGA = 1640C

Increasing final setpoint to 500A

 Wednesday, February 15, 2017, 15:13

IGP1 = 1.8e-6 Torr

TGHT = 500A, 8.59V

OMEGA = 1770C

MIKRON = 1740C

Tapping up manually to ~1800C...

 Thursday, February 16, 2017, 09:09

IGP1 = 5.28e-7 Torr

TGHT = 520A, 9.1V

OMEGA = 1821C

Target boat has remained at max setpoints for 17.5hrs.

Initiating auto-cool at 1A/min

 Thursday, February 16, 2017, 13:49

Increasing auto-cool to 2.0A/min

 Friday, February 17, 2017, 16:00

Vented in air and opened up today.

Endcaps looks good  see photos attached

Thursday, February 09, 2017, 23:26

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

1.  SiC-SiO2-Lys nanofiber mats

2.  SiC pellets

(see Lab Book for more info)

Desired temperature: ~1500C

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

 Thursday, February 09, 2017, 23:38

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

Vac 2.9e-6 Torr.

 Friday, February 10, 2017, 08:58

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

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

Ramping down at 2A/min

 Friday, February 10, 2017, 10:47

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

 Thursday, February 09, 2017, 11:47

A new heatshield with flexible water lines has been put into evap2 last Friday Feb3rd

 Dave Morris did a remote restart of the IOC after the outage. Turbo pump started.

 Tuesday, January 31, 2017, 13:43

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

Container is wrapped with 3 x Ta heat shields, not incl center block.

Loaded into EVAP2 and currently pumping down.

Tuesday, January 31, 2017, 16:02 

IGP1 = 3.9e-6 Torr.

HS water valves opened.

No leaks detected.

Tapped up manually to 35A.

Vacuum stable.

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

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

OMEGA slope = 0.98

 Wednesday, February 01, 2017, 10:01

IGP1 = 5.7e-7 Torr.

TGHT = 254A, 3.0V

TBHT = 142A, 1.8V

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

 Wednesday, February 01, 2017, 11:48

IGP1 = 1.7e-6 Torr.

TGHT = 450A, 6.27V

TBHT = 230A, 3.14V

OMEGA = 1176C

Increasing max setpoint of TGHT = 600A

 Wednesday, February 01, 2017, 13:09

IGP1 = 3.7e-6 Torr.

TGHT = 600A, 9.0V

TBHT = 230A, 3.18V

OMEGA = 1480C

Increasing max setpoint of TGHT = 700A

 Wednesday, February 01, 2017, 14:08

IGP1 = 3.8e-6 Torr.

TGHT = 700A, 10.96V

TBHT = 230A, 3.2V

OMEGA = 1705C

Increasing max setpoint of TGHT = 750A

 Wednesday, February 01, 2017, 15:02

IGP1 = 5.1e-6 Torr.

TGHT = 750A, 11.87V

TBHT = 230A, 3.2V

OMEGA = 1808C

Increasing max setpoint of TGHT = 800A

 Wednesday, February 01, 2017, 15:30

IGP1 = 6.6e-6 Torr.

TGHT = 800A, 12.86V

TBHT = 230A, 3.2V

OMEGA = 1903C

Will remain at max setpoints overnight.

 Thursday, February 02, 2017, 09:16

Remained at max setpoints for ~18hrs.

IGP1 = 9.5e-7 Torr.

OMEGA =1914C

TGHT = 800A, 12.83V

TBHT = 230A, 3.22V

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

 Friday, February 03, 2017, 14:24

Vented in air and opened up this morning

Coating looks good.

See photos attached.

Tuesday, December 20, 2016, 15:05

confirmed ~full tank of Ar for glove box --> ~1600psi 

 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

 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.

 Thursday, December 01, 2016, 16:06

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

Cleaned ionizer tube with acetone, no coating inside ionizer tube

Wrapped with 3 x Ta heat shields, incl center block

Currently pumping down in evap2

OMEGA slope = 0.98

 Friday, December 02, 2016, 11:24

Opened up HS water valves, no leaks detected.

Tapped up manually to 35A.

Waited ~25min, vacuum stable.

IGP1 = 1.65e-6 Torr

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

Max setpoints set for 350A and 230A for the TGHT and TBHT respectively.

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

 Monday, December 05, 2016, 09:38

TGHT = 350A, 5.38V

TBHT = 230A, 4.03V

OMEGA = 1550C

IGP1 = 3.2e-7 Torr

Tapping up to 1900C...

 Monday, December 05, 2016, 14:11

OMEGA = 1905C

TGHT = 475A, 7.63V

TBHT = 230A, 4.07V

IGP1 = 8.5e-7 Torr

 Tuesday, December 06, 2016, 08:41

TGHT = 475A, 7.76V

TBHT = 230A, 4.07V

IGP1 = 3.9e-7 Torr

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

Wednesday, December 07, 2016, 08:46 

Evap2 was vented in air and opened up yesterday afternoon.

Container looks good, coating fully sintered.