Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on

Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on

Marla Cervantes wrote:

Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on

Wednesday, August 14, 2024, 10:18

The turbo pump started up normally. System is purging. and tomorrow the target will be heated.

Marla Cervantes wrote:

Marla Cervantes wrote: Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on Wednesday, August 14, 2024, 10:18 The turbo pump started up normally. System is purging. and tomorrow the target will be heated.

 Wednesday, August 14, 2024, 16:19

• Next ramping: 0.5 A/ 2min  to 250 A.

Very slow rate to allow thermal equilibrium and temperature measurements. Estimated time 3h.

Thursday, August 15, 2024, 08:21

IGP1 = 5.3e-7 Torr

Good vacuum 3e-5 Torr

Bad vacuum 5e-5 Torr

Initial ramping: 2 A/min to 200 A.

Thursday, August 15, 2024, 09:01. Pressure starting to increase at 74 A

Thursday, August 15, 2024, 09:15. Pressure stabilizing 1.8e-6 Torr. Current 103 A, voltage 1.3 V

Thursday, August 15, 2024, 09:21. Pressure increasing (116 A).

 Thursday, August 15, 2024, 09:29 Pressure dropping (Current approx. 120 A)

Thursday, August 15, 2024, 10:54

Started ramping to find a pressure peak corresponding to V vaporization.

IGP1 = 6.4e-7

TGHT = 200 A, 2.9 V, omega 1152 °C

Next ramping: 0.5 A/ 2min  to 250 A

Thursday, August 15, 2024, 11:17

Ramp seem to slow. The temperature change was too subtle (according to the omega).

IGP1 = 6.5e-7

TGHT = 205 A, 3.03 V, omega 1157 °C

Next ramping: 1 A/ 2min  to 250 A

Thursday, August 15, 2024, 11:32

Ramp changed to 0.5 A/min

Thursday, August 15, 2024, 11:54

Ramp was stopped because the pressure was increasing, suggesting the V vaporization.

IGP1 = 6.9e-7

TGHT = 222 A, 3.3 V

Omega 1210 °C, filament 1280 °C

The difference between pyrometers is negligible, suggesting that the V vaporization temperature at 6e-7 Torr of approx. 1300 °C

 Thursday, August 15, 2024, 13:15

IGP1 = 7.9e-7

TGHT = 250 A, 3.8 V

Omega 1289 °C

Thursday, August 15, 2024, 13:16

Ramp set to 0.5 A/min to 300 A

 Pressure mini-spike at 13:18

Omega reading 1291 °C

Thursday, August 15, 2024, 14:08

IGP1 = 8.5e-7

TGHT = 270 A, 4.18 V

Omega 1375 °C, filament 1400 °C

The system stayed at those conditions for 15min

Thursday, August 15, 2024, 14:11

Ramping to 0A at 2A/min

Friday, October 16, 2020, 11:30

 Target mounted in EVAP2. Pump down started

Friday, October 16, 2020, 12:05

Pressure goes up. Checked with Ferran and he says that the valve IEVAP2:RV1 automatically closes sometimes. WEIRD, to be chacked.

Friday, October 16, 2020, 15:20

IGP2 bottoms at 0.2T, and doesn't increase recover if I close RV1 while it shouldn't (as shown before). --> Vented to restart from scratch

Friday, October 16, 2020, 15:45

Pumped down again, vacuum went down to 0.16 and then started raising until ~0.18. This time the valve was open indeed! opening and closing the valve had no effect on the vacuum as if the  booster pump was not effective

Friday, October 16, 2020, 16:27

Tried a THIRD time, this time effectively, to turn the turbo ON. I managed to, but the turbo makes weird spinning sounds every ~30 sec. Moreover, its pumping down plot seems quite weird  - see spike UP while pumping. Could it be related to a dysfunction of the backing pump?

Monday, June 17, 2013, 16:57

Target is loaded with 510 SiC discs

Container was previously coated with TaC and sintered

SiC is wrapped with tantalum heat shield

Chamber is currently being pumped down

Thursday, August 08, 2013, 15:19

NiO target materials loaded into the container yesterday.

Total discs = 530, (5 discs/pack)

length [after loaded] = 9.0cm

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

No end caps were inserted.

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

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

TGHT and TBHT have been stepped up to 50A.

Auto-ramping setting:

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

Good vacuum = 3.00e-05 Torr

Bad vacuum = 4.00e-05 Torr

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

John Wong wrote:

Tuesday, August 27, 2013, 16:48 Target boat is filled with TaC coated endcaps (brown) and some partial sinterred ones (gray) from before.  (see attachment#1). The container is wrapped with Ta heat-shield. Chamber has been pumped down; IG currently @ 7.3e-7 Torr.  Heat-shield cooling water valves are open; no leaks are detected. Initiated TGHT auto-ramping at 0.5A/min, set TGHT max at 580A.  Wednesday, August 28, 2013, 16:09 TGHT has reached to 580A and been heated for over 4 hours. IG is coming down, currently at 1.9 e-6 Torr. Initiated auto-cooling.  2A/min.

 Thursday, August 29, 2013, 11:50

TGHT at 0 A

IG at 3.5e-7 Torr

Turning off EVAP2 and venting chamber

Process complete

John Wong wrote:

Tuesday, September 17, 2013, 11:14 Target boat contains 5 Nb discs.  3 discs are wraps with 0.001" thin of Nb foil (99.8% pure), and 2 are wraps with 0.001" Ta foil (see attachment#1) Chamber has been pumped down over night.  Pressure is currently at 9.8e-7 Torr.  Heating instructions: Samples will be heated up to 800C.  TGHT will be ramped up accordingly. (Two thermocouples are wielded on the target container.) Once at the desired temperature; the samples will be heat for 4 hours before cooling down.  Tuesday, September 17, 2013, 14:37 Target temperature has reached to 800C at around 13:00 (see attachment#2) TGHT @ 230A/3.07V (local 233A/3.25V).  IG @ 1.06e-6 Torr.  The heater will be ramped down at ~17:00 at 2A/min.  Tuesday, September 17, 2013, 17:36 Target temp: T1 = 805C, T2=797.6C IG @ 9.4e-7 Torr. Cooling down initiated.   Wednesday, September 18, 2013, 11:34 TGHT at 0A.  Temp at 22C.  IG @ 5.8e-7 Torr. Venting chamber.

 Thursday, September 19, 2013, 11:41

Target boat contains batch#2 Nb samples (see attachment #1)

Chamber has been pumped down over night.  

IG @ 5.5e-07 Torr. 

CG1B @ 0.033 T

CG1A @ 0.127 T

There is a leak in the backing line.  BV1 was bypassed in order to turn on the turbo pump. (Will investigate the leaks after the processes are done)  

*See attached picture to view samples

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.

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

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, January 20, 2014, 16:32

A new target boat was sprayed with TaC coating and let dry this morning.

The target boat is NOT wrapped with Ta-heat shield.

The boat was installed in Evap#2, chamber is currently being pumped down overnight.

Laura Lambert wrote:

Monday, January 20, 2014, 16:32 A new target boat was sprayed with TaC coating and let dry this morning. The target boat is NOT wrapped with Ta-heat shield. The boat was installed in Evap#2, chamber is currently being pumped down overnight.

 Tuesday, January 21, 2014, 11:10

Chamber was pumped down to ~2e-7 Torr. HS cooling water valves were opened, no leaks detected.

TGHT was stepped up to 35A, voltage max set at 13V. TBHT currently @ 0A.

Waited ~20min, current stabilized, vacuum started to drop, auto-ramp initiated at 2.0A/min and max setpoint to 700A.

Good vacuum: 3.00e-5 Torr, Bad vacuum 4.00e-5 Torr.

Laura Lambert wrote:

Laura Lambert wrote:  Monday, January 20, 2014, 16:32 A new target boat was sprayed with TaC coating and let dry this morning. The target boat is NOT wrapped with Ta-heat shield. The boat was installed in Evap#2, chamber is currently being pumped down overnight.    Tuesday, January 21, 2014, 11:10 Chamber was pumped down to ~2e-7 Torr. HS cooling water valves were opened, no leaks detected. TGHT was stepped up to 35A, voltage max set at 13V. TBHT currently @ 0A. Waited ~20min, current stabilized, vacuum started to drop, auto-ramp initiated at 2.0A/min and max setpoint to 700A. Good vacuum: 3.00e-5 Torr, Bad vacuum 4.00e-5 Torr.

 Tuesday, January 21, 2014, 11:51

Vacuum was grumpy and was well on it's way to tripping off [reached 5e-5 Torr], auto ramping was stopped at ~95A and quickly stepped down to 90A to avoid tripping it off.

Allowed vacuum to settle back down to 2.3e-6 Torr. Auto ramping changed to 0.2A/min and re-started.

 close-call!

Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote:  Monday, January 20, 2014, 16:32 A new target boat was sprayed with TaC coating and let dry this morning. The target boat is NOT wrapped with Ta-heat shield. The boat was installed in Evap#2, chamber is currently being pumped down overnight.    Tuesday, January 21, 2014, 11:10 Chamber was pumped down to ~2e-7 Torr. HS cooling water valves were opened, no leaks detected. TGHT was stepped up to 35A, voltage max set at 13V. TBHT currently @ 0A. Waited ~20min, current stabilized, vacuum started to drop, auto-ramp initiated at 2.0A/min and max setpoint to 700A. Good vacuum: 3.00e-5 Torr, Bad vacuum 4.00e-5 Torr.    Tuesday, January 21, 2014, 11:51 Vacuum was grumpy and was well on it's way to tripping off [reached 5e-5 Torr], auto ramping was stopped at ~95A and quickly stepped down to 90A to avoid tripping it off. Allowed vacuum to settle back down to 2.3e-6 Torr. Auto ramping changed to 0.2A/min and re-started.  close-call!

 Wednesday, January 22, 2014, 09:46

TGHT has been slowly ramping up overnight at a rate of 0.2A/min.

IGP1 = 2.9e-7 Torr, TGHT = 342A; stepping ramping rate up to 2.0A/min.

Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote:  Monday, January 20, 2014, 16:32 A new target boat was sprayed with TaC coating and let dry this morning. The target boat is NOT wrapped with Ta-heat shield. The boat was installed in Evap#2, chamber is currently being pumped down overnight.    Tuesday, January 21, 2014, 11:10 Chamber was pumped down to ~2e-7 Torr. HS cooling water valves were opened, no leaks detected. TGHT was stepped up to 35A, voltage max set at 13V. TBHT currently @ 0A. Waited ~20min, current stabilized, vacuum started to drop, auto-ramp initiated at 2.0A/min and max setpoint to 700A. Good vacuum: 3.00e-5 Torr, Bad vacuum 4.00e-5 Torr.    Tuesday, January 21, 2014, 11:51 Vacuum was grumpy and was well on it's way to tripping off [reached 5e-5 Torr], auto ramping was stopped at ~95A and quickly stepped down to 90A to avoid tripping it off. Allowed vacuum to settle back down to 2.3e-6 Torr. Auto ramping changed to 0.2A/min and re-started.  close-call!    Wednesday, January 22, 2014, 09:46 TGHT has been slowly ramping up overnight at a rate of 0.2A/min. IGP1 = 2.9e-7 Torr, TGHT = 342A; stepping ramping rate up to 2.0A/min.

 Wednesday, January 22, 2014, 13:43

TGHT is sitting at 693A, IGP1 = 1.3e-6 Torr.

Stepping up TGHT voltage up to 14V from 13.05V to reach the max current of 700A.

John Wong wrote:

John Wong wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote:  Monday, January 20, 2014, 16:32 A new target boat was sprayed with TaC coating and let dry this morning. The target boat is NOT wrapped with Ta-heat shield. The boat was installed in Evap#2, chamber is currently being pumped down overnight.    Tuesday, January 21, 2014, 11:10 Chamber was pumped down to ~2e-7 Torr. HS cooling water valves were opened, no leaks detected. TGHT was stepped up to 35A, voltage max set at 13V. TBHT currently @ 0A. Waited ~20min, current stabilized, vacuum started to drop, auto-ramp initiated at 2.0A/min and max setpoint to 700A. Good vacuum: 3.00e-5 Torr, Bad vacuum 4.00e-5 Torr.    Tuesday, January 21, 2014, 11:51 Vacuum was grumpy and was well on it's way to tripping off [reached 5e-5 Torr], auto ramping was stopped at ~95A and quickly stepped down to 90A to avoid tripping it off. Allowed vacuum to settle back down to 2.3e-6 Torr. Auto ramping changed to 0.2A/min and re-started.  close-call!    Wednesday, January 22, 2014, 09:46 TGHT has been slowly ramping up overnight at a rate of 0.2A/min. IGP1 = 2.9e-7 Torr, TGHT = 342A; stepping ramping rate up to 2.0A/min.    Wednesday, January 22, 2014, 13:43 TGHT is sitting at 693A, IGP1 = 1.3e-6 Torr. Stepping up TGHT voltage up to 14V from 13.05V to reach the max current of 700A.    Wednesday, January 22, 2014, 15:09 TGHT reached to 700A/12.83V.  Local temperature on the boat surface was measured at ~1500C. Target will be heated for a few hours and will be cooled down later tonight. The chamber will be vented tomorrow and the boat will be inspected.    Wednesday, January 22, 2014, 18:09 After the boat was heated for ~4hrs, TGHT tripped off on IEVAP2:TBHT2 (see attachment #1, #2).  Tried clearing the water interlock via EPICS - failed to clear.  Checked the local water valves - ALL VALVES are OPEN  Tried closing and re-opening the IEVAP2:TBHT2 valves, interlock cleared after a few minutes.  Maybe a fault in the water signal.  If it happens again, the water signal should be replaced. Turned back on the power supply - TGHT current/voltage are holding.  Target boat may be OK! Chamber is a bit warm now.  Will allow time to cool down. Will vent the chamber tomorrow and the boat will be inspected.

 Thursday, January 23, 2014, 16:18

Chamber vented overnight and was opened up this morning.

Target boat not fully sintered [see attached photos].

Chamber currently being pumped down again in order to continue with sintering TaC coating.

HS cooling water valves were opened, no leaks detected.

Will ramp up to 700A again over the weekend.

Laura Lambert wrote:

John Wong wrote: John Wong wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote:  Monday, January 20, 2014, 16:32 A new target boat was sprayed with TaC coating and let dry this morning. The target boat is NOT wrapped with Ta-heat shield. The boat was installed in Evap#2, chamber is currently being pumped down overnight.    Tuesday, January 21, 2014, 11:10 Chamber was pumped down to ~2e-7 Torr. HS cooling water valves were opened, no leaks detected. TGHT was stepped up to 35A, voltage max set at 13V. TBHT currently @ 0A. Waited ~20min, current stabilized, vacuum started to drop, auto-ramp initiated at 2.0A/min and max setpoint to 700A. Good vacuum: 3.00e-5 Torr, Bad vacuum 4.00e-5 Torr.    Tuesday, January 21, 2014, 11:51 Vacuum was grumpy and was well on it's way to tripping off [reached 5e-5 Torr], auto ramping was stopped at ~95A and quickly stepped down to 90A to avoid tripping it off. Allowed vacuum to settle back down to 2.3e-6 Torr. Auto ramping changed to 0.2A/min and re-started.  close-call!    Wednesday, January 22, 2014, 09:46 TGHT has been slowly ramping up overnight at a rate of 0.2A/min. IGP1 = 2.9e-7 Torr, TGHT = 342A; stepping ramping rate up to 2.0A/min.    Wednesday, January 22, 2014, 13:43 TGHT is sitting at 693A, IGP1 = 1.3e-6 Torr. Stepping up TGHT voltage up to 14V from 13.05V to reach the max current of 700A.    Wednesday, January 22, 2014, 15:09 TGHT reached to 700A/12.83V.  Local temperature on the boat surface was measured at ~1500C. Target will be heated for a few hours and will be cooled down later tonight. The chamber will be vented tomorrow and the boat will be inspected.    Wednesday, January 22, 2014, 18:09 After the boat was heated for ~4hrs, TGHT tripped off on IEVAP2:TBHT2 (see attachment #1, #2).  Tried clearing the water interlock via EPICS - failed to clear.  Checked the local water valves - ALL VALVES are OPEN  Tried closing and re-opening the IEVAP2:TBHT2 valves, interlock cleared after a few minutes.  Maybe a fault in the water signal.  If it happens again, the water signal should be replaced. Turned back on the power supply - TGHT current/voltage are holding.  Target boat may be OK! Chamber is a bit warm now.  Will allow time to cool down. Will vent the chamber tomorrow and the boat will be inspected.     Thursday, January 23, 2014, 16:18 Chamber vented overnight and was opened up this morning. Target boat not fully sintered [see attached photos]. Chamber currently being pumped down again in order to continue with sintering TaC coating. HS cooling water valves were opened, no leaks detected. Will ramp up to 700A again over the weekend.

 Friday, January 24, 2014, 14:21

Chamber was pumped down to 1.7e-7 Torr.

TGHT was stepped up to 35A, voltage max set at 14V. TBHT currently sitting at 0A.

Waited 20min, vacuum consistently stable. Auto-ramp initiated at 2.0 A/min and max setpoint to 700A.

Laura Lambert wrote:

Laura Lambert wrote: John Wong wrote: John Wong wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote:  Monday, January 20, 2014, 16:32 A new target boat was sprayed with TaC coating and let dry this morning. The target boat is NOT wrapped with Ta-heat shield. The boat was installed in Evap#2, chamber is currently being pumped down overnight.    Tuesday, January 21, 2014, 11:10 Chamber was pumped down to ~2e-7 Torr. HS cooling water valves were opened, no leaks detected. TGHT was stepped up to 35A, voltage max set at 13V. TBHT currently @ 0A. Waited ~20min, current stabilized, vacuum started to drop, auto-ramp initiated at 2.0A/min and max setpoint to 700A. Good vacuum: 3.00e-5 Torr, Bad vacuum 4.00e-5 Torr.    Tuesday, January 21, 2014, 11:51 Vacuum was grumpy and was well on it's way to tripping off [reached 5e-5 Torr], auto ramping was stopped at ~95A and quickly stepped down to 90A to avoid tripping it off. Allowed vacuum to settle back down to 2.3e-6 Torr. Auto ramping changed to 0.2A/min and re-started.  close-call!    Wednesday, January 22, 2014, 09:46 TGHT has been slowly ramping up overnight at a rate of 0.2A/min. IGP1 = 2.9e-7 Torr, TGHT = 342A; stepping ramping rate up to 2.0A/min.    Wednesday, January 22, 2014, 13:43 TGHT is sitting at 693A, IGP1 = 1.3e-6 Torr. Stepping up TGHT voltage up to 14V from 13.05V to reach the max current of 700A.    Wednesday, January 22, 2014, 15:09 TGHT reached to 700A/12.83V.  Local temperature on the boat surface was measured at ~1500C. Target will be heated for a few hours and will be cooled down later tonight. The chamber will be vented tomorrow and the boat will be inspected.    Wednesday, January 22, 2014, 18:09 After the boat was heated for ~4hrs, TGHT tripped off on IEVAP2:TBHT2 (see attachment #1, #2).  Tried clearing the water interlock via EPICS - failed to clear.  Checked the local water valves - ALL VALVES are OPEN  Tried closing and re-opening the IEVAP2:TBHT2 valves, interlock cleared after a few minutes.  Maybe a fault in the water signal.  If it happens again, the water signal should be replaced. Turned back on the power supply - TGHT current/voltage are holding.  Target boat may be OK! Chamber is a bit warm now.  Will allow time to cool down. Will vent the chamber tomorrow and the boat will be inspected.     Thursday, January 23, 2014, 16:18 Chamber vented overnight and was opened up this morning. Target boat not fully sintered [see attached photos]. Chamber currently being pumped down again in order to continue with sintering TaC coating. HS cooling water valves were opened, no leaks detected. Will ramp up to 700A again over the weekend.  Friday, January 24, 2014, 14:21 Chamber was pumped down to 1.7e-7 Torr. TGHT was stepped up to 35A, voltage max set at 14V. TBHT currently sitting at 0A. Waited 20min, vacuum consistently stable. Auto-ramp initiated at 2.0 A/min and max setpoint to 700A.

 Monday, January 27, 2014, 10:05

TGHT reached 700A over the weekend. Measured temp @ 2000C.

TGHT auto-cool inititated at 2.0A/min.

Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote: John Wong wrote: John Wong wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote:  Monday, January 20, 2014, 16:32 A new target boat was sprayed with TaC coating and let dry this morning. The target boat is NOT wrapped with Ta-heat shield. The boat was installed in Evap#2, chamber is currently being pumped down overnight.    Tuesday, January 21, 2014, 11:10 Chamber was pumped down to ~2e-7 Torr. HS cooling water valves were opened, no leaks detected. TGHT was stepped up to 35A, voltage max set at 13V. TBHT currently @ 0A. Waited ~20min, current stabilized, vacuum started to drop, auto-ramp initiated at 2.0A/min and max setpoint to 700A. Good vacuum: 3.00e-5 Torr, Bad vacuum 4.00e-5 Torr.    Tuesday, January 21, 2014, 11:51 Vacuum was grumpy and was well on it's way to tripping off [reached 5e-5 Torr], auto ramping was stopped at ~95A and quickly stepped down to 90A to avoid tripping it off. Allowed vacuum to settle back down to 2.3e-6 Torr. Auto ramping changed to 0.2A/min and re-started.  close-call!    Wednesday, January 22, 2014, 09:46 TGHT has been slowly ramping up overnight at a rate of 0.2A/min. IGP1 = 2.9e-7 Torr, TGHT = 342A; stepping ramping rate up to 2.0A/min.    Wednesday, January 22, 2014, 13:43 TGHT is sitting at 693A, IGP1 = 1.3e-6 Torr. Stepping up TGHT voltage up to 14V from 13.05V to reach the max current of 700A.    Wednesday, January 22, 2014, 15:09 TGHT reached to 700A/12.83V.  Local temperature on the boat surface was measured at ~1500C. Target will be heated for a few hours and will be cooled down later tonight. The chamber will be vented tomorrow and the boat will be inspected.    Wednesday, January 22, 2014, 18:09 After the boat was heated for ~4hrs, TGHT tripped off on IEVAP2:TBHT2 (see attachment #1, #2).  Tried clearing the water interlock via EPICS - failed to clear.  Checked the local water valves - ALL VALVES are OPEN  Tried closing and re-opening the IEVAP2:TBHT2 valves, interlock cleared after a few minutes.  Maybe a fault in the water signal.  If it happens again, the water signal should be replaced. Turned back on the power supply - TGHT current/voltage are holding.  Target boat may be OK! Chamber is a bit warm now.  Will allow time to cool down. Will vent the chamber tomorrow and the boat will be inspected.     Thursday, January 23, 2014, 16:18 Chamber vented overnight and was opened up this morning. Target boat not fully sintered [see attached photos]. Chamber currently being pumped down again in order to continue with sintering TaC coating. HS cooling water valves were opened, no leaks detected. Will ramp up to 700A again over the weekend.  Friday, January 24, 2014, 14:21 Chamber was pumped down to 1.7e-7 Torr. TGHT was stepped up to 35A, voltage max set at 14V. TBHT currently sitting at 0A. Waited 20min, vacuum consistently stable. Auto-ramp initiated at 2.0 A/min and max setpoint to 700A.    Monday, January 27, 2014, 10:05 TGHT reached 700A over the weekend. Measured temp @ 2000C. TGHT auto-cool inititated at 2.0A/min.

 Tuesday, January 28, 2014, 11:53

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

Target boat still has a strip of green, still not fully sintered! [see attached photos].

Chamber currently being pumped down again to attempt sintering - round 3.