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, February 02, 2015, 16:28

Container is coated with TaC.  No Ta foil wrapped around. 

Chamber is being pumped down.

TGHT/TBHT will be ramped up to 580A/230A at 0.2A/min.

John Wong wrote:

Monday, February 02, 2015, 16:28 Container is coated with TaC.  No Ta foil wrapped around.  Chamber is being pumped down. TGHT/TBHT will be ramped up to 580A/230A at 0.2A/min.

 Tuesday, February 03, 2015, 10:28

HS water valves opened; no leaks detected.

IGP1 = 5.9e-7 Torr

 Wednesday, February 04, 2015, 11:10

attempted to initiate manual ramp up of TGHT and TBHT yesterday, but not responding to EPICS

currently sitting under vacuum, waiting on fix...

 Wednesday, February 04, 2015, 14:16

controls fixed.

initiated auto-ramp.

 Thursday, February 05, 2015, 08:56

IGP1 = 4.1e-7 Torr

TGHT = 290A

TBHT = 225A

Increasing auto-ramp to 1.0A/min

 Thursday, February 05, 2015, 13:49

IGP1 = 1.4e-6 Torr

TGHT = 569A

TBHT = 232A

Increasing auto-ramp to 2.0A/min

Laura Lambert wrote:

John Wong wrote: Monday, February 02, 2015, 16:28 Container is coated with TaC.  No Ta foil wrapped around.  Chamber is being pumped down. TGHT/TBHT will be ramped up to 580A/230A at 0.2A/min.      Tuesday, February 03, 2015, 10:28 HS water valves opened; no leaks detected. IGP1 = 5.9e-7 Torr  Wednesday, February 04, 2015, 11:10 attempted to initiate manual ramp up of TGHT and TBHT yesterday, but not responding to EPICS currently sitting under vacuum, waiting on fix...  Wednesday, February 04, 2015, 14:16 controls fixed. initiated auto-ramp.  Thursday, February 05, 2015, 08:56 IGP1 = 4.1e-7 Torr TGHT = 290A TBHT = 225A Increasing auto-ramp to 1.0A/min  Thursday, February 05, 2015, 13:49 IGP1 = 1.4e-6 Torr TGHT = 569A TBHT = 232A Increasing auto-ramp to 2.0A/min

 Thursday, February 05, 2015, 18:02

Auto-cooling TGHT to 400A at 1A/min.  Need to take voltage reading tomorrow. 

John Wong wrote:

Laura Lambert wrote: John Wong wrote: Monday, February 02, 2015, 16:28 Container is coated with TaC.  No Ta foil wrapped around.  Chamber is being pumped down. TGHT/TBHT will be ramped up to 580A/230A at 0.2A/min.      Tuesday, February 03, 2015, 10:28 HS water valves opened; no leaks detected. IGP1 = 5.9e-7 Torr  Wednesday, February 04, 2015, 11:10 attempted to initiate manual ramp up of TGHT and TBHT yesterday, but not responding to EPICS currently sitting under vacuum, waiting on fix...  Wednesday, February 04, 2015, 14:16 controls fixed. initiated auto-ramp.  Thursday, February 05, 2015, 08:56 IGP1 = 4.1e-7 Torr TGHT = 290A TBHT = 225A Increasing auto-ramp to 1.0A/min  Thursday, February 05, 2015, 13:49 IGP1 = 1.4e-6 Torr TGHT = 569A TBHT = 232A Increasing auto-ramp to 2.0A/min    Thursday, February 05, 2015, 18:02 Auto-cooling TGHT to 400A at 1A/min.  Need to take voltage reading tomorrow.

 Tuesday, February 10, 2015, 09:35

Vented and opened this morning.

Container fully sintered.

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!

Thursday, July 19, 2012, 16:58

The target container was coated with TaC. 

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

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

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

Currently, IGP1 = 1.5e-6 Torr.  BP = 15mTorr

 Friday, July 20, 2012, 13:56

TGHT and TBHT reached to 580A & 230A, respectively, and stayed for ~ 2hrs. 

Measured temperature at the ionizer tube to be 1630C.

Cooling down in process at 2A/min...

 Sunday, July 22, 2012, 20:53

The chamber was vented earlier around 14:00hr.  

The target container looks good! 

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

Monday, November 08, 2021, 09:35

Two groups of 4 caps wrapped in graphite with graphite discs in between. 

Two TaC coated springs at either end of the boat.

Target temperature = 1800 C

Expected around 430 TGHT

Good Vacuum 3e-03 Torr

Bad Vacuum 5e-02 Torr

Evap two was left pressuring down over weekend.

Monday, November 08, 2021, 09:35

Starting autoramp to 40 A at 1A/min

TGHT = 2.5e-07 Torr

Monday, November 08, 2021, 10:57

IGP1 = 8.5e -06 Torr and dropping

set autoramp to 50A at 1A/min

IGP1 1.0e-05 Torr and dropping

Set TGHT to autoramp to 90 A @ 1A/min and leave until pressure below 9e-06 Torr

Monday, November 08, 2021, 15:09

IGP1= 9.6e-06 Torr

Start autoramp to 400A at 2A/min 

Monday, November 08, 2021, 17:37

TGHT = 377 A, 6.1V

OMEGA= 1234 C

Monday, November 08, 2021, 17:58

OMEGA = 1292 (cannot trust )

400A, 6.3 V

1.4 e-05 Torr

 Autoramp @ 1A/min to 425A

Will heat to 425A and keep there for four hours

Monday, November 08, 2021, 22:02

TGHT=420A, 6.7V

IGP1= 7.0e-06 Torr

Start ramp down at -2A/min 

Thursday, October 21, 2021, 10:02

10 TaC coated Ta caps, wrapped in graphite foil.

2 TaC coated Ta springs .

All mounted inside a target boat with enclosed ends.

Good vacuum = 3.0 e-3 Torr

Bad vacuum = 5.0 e-2 Torr

Will heat up to 1800-1900 C and keep at Temp for four hours

OMEGA slope = 0.990

*Note that the turbo pump has been replaced and this is the first EVAP2 operation after replacement*

Thursday, October 21, 2021, 10:03

IGP1= 1.6 e-06 Torr

starting ramp up at  2 amp/min to 30 A on TGHT

Thursday, October 21, 2021, 10:46

Ramping to 40 A at 2A/min and will keep there for 20 minutes. 

Thursday, October 21, 2021, 11:19

 IGP1= 1.2e-05 Torr and dropping

Start ramp up to 400 A at 0.5A/min

Thursday, October 21, 2021, 18:58

Started ramping at 3A/min to 468A on TGHT

Thursday, October 21, 2021, 20:15

Current at 468.  Will keep there until pressure low enough.

Friday, October 22, 2021, 05:50

IGP1= 8.9 e-06 Torr

Start ramp down at -2A/min

 Monday, October 25, 2021, 11:47

Upon examination the caps and springs did not appeared coated.  The camera was not online so the current used was based on previous elogs.  It may have evaporated TaC due to over temperature.

The materials will be cleaned, recoated and resintered.

Alarm noted on passing Hot Lab. RPG notified, no radiological hazards. ISAC ops contacted, drop in DI water last night.

Entered w/ PPE. Chiller alarming. Evap 1 running ok

Friday, June 08, 2018, 08:30: Chiller turned on/off. Reset. No alarm.

Monday, July 30, 2012, 15:38

The evaporator was used for the processing the NiO target for 8 days and it was discovered today that there was a puddle of water underneath the chiller. 

The cover of the chiller was removed and some water around the plumbing was found (see attachment #1). 

Will continue to keep running the chiller to see if there is more water leaking out...

Monday, May 28, 2012, 11:08

It was discovered this morning that the Evaporator #2 chiller was leaking water from the bottom (see attachment 1).  A puddle of water was formed and eventually found its way down to the Hotcell. 

The evaporator was running over the weekend for the BeO pellets process.  The TGHT is now off and the chiller will be inspected... 

Gradually open waterlines under vacuum after period of no use.

Wednesday, May 20, 2020, 07:17: Vacuum @ 1.13e-06T

Wednesday, May 20, 2020, 07:19: Hot lab cooling water return opened. Vacuum @ 1.13e-06T.

Wednesday, May 20, 2020, 07:22: Hot lab cooling water supply opened. Vacuum @ 1.11e-06T.

Wednesday, May 20, 2020, 07:29: Vacuum remains stable @ 1.11e-06T.  

Monday, August 21, 2017, 17:09

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

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

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

Vacuum at 7.5 e-6 Torr.

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

 Thursday, August 24, 2017, 00:28

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

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

 Thursday, August 24, 2017, 23:42

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

Ramp up to 460A at 0.1A/min.

 Friday, August 25, 2017, 10:30

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

Tapping up TGHT to reach 1600c.

Friday, August 25, 2017, 15:17

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

Sample will be taken out next Monday for evaluation.

Tuesday, May 02, 2023, 14:03

Two np-TiO2 spun fibrous pellets and 1 batch of fibre mats were wrapped with graphite foils and loaded into a target boat.

Sample will be heated to 1875C, similar to the previous process, see e-log ID#605 (TGHT: 440A/7.6V).

TGHT will be autoramped to 350 A and monitor the conditions before ramping up further.

Good vacuum: 3e-5 Torr

Bad vacuum: 5e-5 Torr

Omega slope: 1.08

In the previous process (ID#605), Ta-foil was inserted at both ends of the tubes to hold the sample together. However, it was observed that the out-gassing of the material reacted with the Ta-foil, causing issues. Therefore, it's decided not to cover the ends with Ta-foil, and the sensor is now looking at the graphite foil. It had previously determined the slope for SiC material set for its emissivity, but need to note any errors that may have arisen due to the change in the sample setup.

See attachment#1 for sample setup - note that Omega sensor is slightly looking at the edge of the Ta-boat tube. 

Initiate autoramp: 1 A/min

Chamber has been pumped down below 5.6e-6 Torr.

 Tuesday, May 02, 2023, 15:31

Vacuum spike TGHT at 75A, auto-ramping down kicked in.

 Wednesday, May 03, 2023, 12:18Thursday, May 04, 2023, 15:16

TGHT has been holding at 350A/5.7V (1995W) for almost 2hrs, temp is reading at 1368C - 232C lower than the previous process (ID#605) with TGHT = 348/5.8V (2018W).

Pressure started to come down around 344A/5.5V, temp 1331C - see attachment #2.

Current status overall view - see attachment #3

Continue to ramp up t0 440A at 1A/min and monitor.

 Wednesday, May 03, 2023, 14:47

TGHT reached 440A/7.5V, temp reading at 1672C.  Pressure is coming down, currently at 1.8e-6 Torr.  Will keep at this setting overnight and will check the Omega/emmissivity to confirm the temperature.

 Thursday, May 04, 2023, 10:54

Eractic vacuum spikes started just over 3 hrs ago.  Temp at 1681 C; TGHT has been stable at 440A/7.6V. Pressure ranging between 5.0e-7 to 1.5 e-6 and gradually decreasing, see attachment #4. 

Will perform the omega/emmissivity measurement.

 Thursday, May 04, 2023, 15:16

Temperature was checked with the digital and analogue pyrometers. 

With the analogue pyrometer on the Ta-container (left end, top surface), measured temp = 1360 C, with e=0.22, correction + 200 C => 1560 C

With the Omega pyrometer (right end), 1-color mode with e= 0.22, temp = 1585 C. 

Setting Omega pyrometer to 2-color mode with e= 0.99 temp = 1516 C --  this is in agreement with the measurements for Ta.  Note that the pyrometer is looking at some part of the Ta container which is not covered by the sample wrapped with the graphite foil (see attachment #5). 

From e-log#596, temp was reported at 1520 C (slope at 0.99) with a Ta-foil at the end of the tube, but from e-log#605, temp was reported at 1864 C (slope at 0.99) - possibly an error occurred during that time.

In conclusion, the temp should be at 1530 C +/- 10C with TGHT = 440A/7.7V (3388W).

 Thursday, May 04, 2023, 15:43

Vacuum spikes continue every 30 min lasting for 10 min. 

Tapped down TGHT to 430A/7.5V, temp reading at 1500 C.  Will monitor if any improvement with the vacuum.

 Friday, May 05, 2023, 09:34

Vacuum spikes continue to happen; see attachment #6 for the striptool overview.

Lower TGHT to 420A/7.3V, temp = 1480 C.

 Friday, May 05, 2023, 10:10

Vacuum spikes continue every 20-30 min lasting for 10 min. 

Lower TGHT to 410A/7.1V, temp = 1450 C

 Friday, May 05, 2023, 11:25

Vacuum spikes continue,

Lower TGHT to 400A/6.93V, temp = 1433 C

 Friday, May 05, 2023, 12:20

Vacuum spikes - lower TGHT to 390A/6.7V, temp at 1407C

Friday, May 05, 2023, 13:19

Vacuum spikes - lower TGHT to 380A/6.5V, temp at 1388C

Friday, May 05, 2023, 13:47

Vacuum spikes - lower TGHT to 370A/6.3V, temp at1373 C

Friday, May 05, 2023, 14:16

Vacuum spikes - lower TGHT 360A/6.1V, temp at 1348 C

Friday, May 05, 2023, 15:11

Vacuum spikes - lower TGHT 350A/5.9V, temp at 1308 C

Friday, May 05, 2023, 16:34

Vacuum spikes - lower TGHT 340A/5.7V, temp at 1371 C

Friday, May 05, 2023, 16:56

Vacuum spikes continue; container possibly broken.

Slow ramp down TGHT at -0.5A/min to see when the vacuum spikes would stop.

 Monday, May 08, 2023, 09:54

TGHT was ramped down over the weekend.  Chamber was kept under vacuum and vacuum continued to spike; suspecting problem with the gauge?! see attachment &7 for an over view.

Will take out the samples for exam.

Monday, August 19, 2024, 13:06

Target container consists of 2 samples, and both samples were heat stabilized at 150 C for 24 hours then pre-oxidized at 360 C for 4 hours:

1.  PVP (7% wt/v) spun fibres 0.0569 g

2.  np-Ta (Dope 7) spun fibres: 0.1730 g

Samples are wrapped in graphite foil and loaded into a target boat which is wrapped with Ta foil.

Omega slope set at 0.99.

Similar heat treatment as the 1st attempt, see e-log #667 (1800 C = 402A/7.2V).

Good vac = 3 e-5 Torr

Bad vac = 5 e-5 Torr.

Chamber is currently pumping down.

 Monday, August 19, 2024, 16:52

Chamber pressure @ 4.6e-6 Torr.

Initiate auto-ramping at 1A/min to reach 400A.

Continue to monitor the pressure and TGHT.

Tuesday, August 20, 2024, 09:48

TGHT reached 400 A/6.87V about 10 hr ago.  But the temperature has been holding at 1665 C. 

The voltage is much lower this time compared to the previous heat treatment.  See attachment #1 for the overall process.

Ramping up to 450A.  Continue monitoring..

Tuesday, August 20, 2024, 15:43

TGHT at 450A (readback 441A)/7.892V, temperature holding at 1803C

Pressure coming down from 1.62e-6 Torr. 

Continue to hold on the temperature for a few more hours before cooling it down

 Wednesday, August 21, 2024, 09:40

Temperature was holding for about 18 hours before ramping down TGHT was initiated at 2A/min.

The samples can be taken out after 2 pm.

 Thursday, July 25, 2024, 15:18

Target container consists of two np-Ta fibres disk samples. Both disks are made from heat stabilized np-Ta fibres (150 C for 17 hours) and were pressed at 8 tons / 300 MPa.

Sample 1 was made from np-Ta fibres spun using Dope solution #1. Sample 1 disk has an average thickness of 0.727 mm and a diameter of 17.113 mm. Mass of the green sample 1 disk is 0.1957 g. 

Sample 2 was made from np-Ta fibres spun using Dope solution #6. Sample 2 disk has an average thickness of 0.688 mm and a diameter of 17.123 mm. Mass of the heat stabilized fibres used to make the green sample 2 disk is 0.1860 g. Mass loss from pressing the heat stabilized fibres was virtually zero. Therefore, although the mass of the green sample 2 disk was not measured, it can be extrapolated to be 0.1860 g. 

Target container was wrapped with Ta foil. Each sample disk was wrapped in graphite foil and placed inside the target container horizontally near the center. 

Omega slope was initially set to 0.980. After reviewing previous logbook on np-Ti (e-log ID#633), changed the Omega slope to 0.990. 

Chamber is currently being pumped down. The current reading (as of 15:40) is 4.70e-05 Torr. 

Two heating schedules will be tested. Heating schedule 1 entails heating both sample disks at ~1000 C until the pressure reaches below 1.00e-06 Torr. Once heating schedule 1 is completed, sample 1 will be removed. Heating schedule 2 entails heating sample 2 to ~1800 C until the pressure reaches below 1.00e-06 Torr. TGHT is estimated to be approximately 440A/7.6V to reach 1875 C (348A/5.8V to hold temperature at 1600 C). Refer to e-log ID#605. 

Angelina Chen wrote:

Thursday, July 25, 2024, 15:18 Target container consists of two np-Ta fibres disk samples. Both disks are made from heat stabilized np-Ta fibres (150 C for 17 hours) and were pressed at 8 tons / 300 MPa. Sample 1 was made from np-Ta fibres spun using Dope solution #1. The sample 1 disk has an average thickness of 0.727 mm and a diameter of 17.113 mm. The mass of the green sample 1 disk is 0.1957 g.  Sample 2 was made from np-Ta fibres spun using Dope solution #6. The sample 2 disk has an average thickness of 0.688 mm and a diameter of 17.123 mm. The mass of the heat stabilized fibres used to make the green sample 2 disk is 0.1860 g. The mass loss from pressing the heat stabilized fibres was virtually zero. Therefore, while the mass of the green sample 2 disk was not measured, it can be extrapolated to be 0.1860 g.  The target container was wrapped with Ta foil. Each sample disk was wrapped in graphite foil and placed inside the target container horizontally near the center.  The Omega slope was initially set to 0.980. After reviewing previous logbook on np-Ti The chamber is currently being pumped down. The current reading (as of 15:40) is 4.70e-05 Torr.  Two heating schedules will be tested. Heating schedule 1 entails heating both sample disks at ~1000 C until the pressure reaches below 1.00e-06 Torr. Once heating schedule 1 is completed, sample 1 will be removed. Heating schedule 2 entails heating sample 2 to ~1800 C until the pressure reaches below 1.00e-06 Torr. TGHT is estimated to be approximately 440A/7.6V to reach 1875 C (348A/5.8V to hold temperature at 1600 C). Refer to e-log ID#605.

 Friday, July 26, 2024, 09:52

Chamber has been pumped down overnight, pressure currently at 1e-6 Torr.

Initiate auto ramping 1A/min to reach 200 A. 

Good vac = 3 e-5 Torr

Bad vac = 5 e-5 Torr. 

Continue to monitor.

 Friday, July 26, 2024, 17:06

Gas evolution has seen observed to be completed as TGHT slowly ramping up.  Temp is currently reading at 1015 C, TGHT 164A/2.43V.  Pressure holding at 2.4e-6 Torr but slowly coming down, see attachment 1.  Will keep this setting and cool it down on Sunday.

 Sunday, July 28, 2024, 11:27

Temperature has been holding sturdy at ~1000C for over 36 hours, TGHT at 164A/2.59V (a slight increase in the voltage).  Pressure is currentlyat 4.5e-7 Torr (see attachment #2 for the archiver).

Ramping down TGHT at 1A/min. 

Will remove both samples on Monday to measure the mass loss.  Sample 1 will be analyzed.  Sample 2 will be loaded back to the Evap 2 for further heating to reach about 1800 C.

 Monday, July 29, 2024, 14:29

Both samples were removed from the chamber and measured for weight loss, and Sample 2 was put back for further heating; Thanks Darwin for helping up with this. 

Chamber is currently pump down, pressure at 6.0e-5 Torr. Will ramp up TGHT once the pressure has come down to 10e-6 Torr. 

 Monday, July 29, 2024, 16:52

Pressure at 6.5e-6 Torr.  Ramping up TGHT at 2A/min to reach 164A (previous setting at ~1000C).

 Tuesday, July 30, 2024, 09:02

Temperature has been holding at about 1000C. THGT at 160A(readback,, 164A setpoint)/2.56V.  Pressure 7e-7 Torr.

Stepping up 1A/min in 20A increment to reach 1800C. 

Continue to monitor.

 Tuesday, July 30, 2024, 10:07

Plotting out THGT (readback) vs Temp:

181 A/2.91V, 1070C

206A/3.34V, 1153C

225A/3.7V, 1213C

245A/4.1V, 1277C

Wednesday, July 31, 2024, 11:26

TGHT tripped off due to HS water flow NOT oK,  Attempted to clear it but did not work, see attachment #3. 

Will stop the process for now and investigate the problem. 

 Wednesday, July 31, 2024, 12:10

Darwin helped to check the surrounding of the lab for water leaks; everything was good and the chamber remained under vacuum. 

All the water paddle wheels were moving.  A slight touch of the HS paddle wheel somehow cleared the interlock. Maybe the connection was loose. 

We checked all the paddle wheels by shutting and opening the water valves.  All the interlocks responded correctly. 

Continue with the heating process...

Ramping up TGHT at 2A/min to reach 300A.

 Wednesday, July 31, 2024, 15:27

TGHT vs temp:

294A/5.1V 1477C

343A/6.0A, 1633C

402A/7.2V, 1818C

Will keep TGHT at 410A (setpoint) for night.(see attachment#4)

 Tuesday, August 06, 2024, 10:00

Venting Evap 2; the process is done.

The sample will be analyzed.