2020-10-13 11:13 Target was left under vacuum over the weekend. IGP1: 1.6e-7T water on- leak check ok. Ramping up 2A/30s to 100A.

 2020-10-13 11:47 All ok at 100A. Ramping up, 1A/10s to 200A.

 2020-10-13 12:08 All ok at 200A. Temp tc on foil 200degC. Ramping up, 1A/10s to 300A.

 2020-10-13 12:08 All ok at 300A. Temp tc on foil 340degC. Ramping up, 1A/10s to 400A.

 2020-10-13 12:48 All ok at 400A. Temp tc on foil 474degC. pyro shows 1050degC Ramping up, 1A/10s to 500A.

 2020-10-13 13:06 All ok at 500A. Temp tc on foil 615degC. pyro shows 1238degC Ramping down, 1A/10s to 0A.

 2020-10-13 17:04 The foil has been replaced due to suspected radiation transparency being the cause of low measured temperatures. A graphite and tantalum pack is now attached. Vacuum is back to IGP1: 9.5e-6T. Ramping up to 100A, 1A/10s.

 2020-10-13 17:31 All ok at 100A. Temp tc on foil 80degC. Ramping up, 1A/10s to 200A.

 2020-10-13 17:31 All ok at 200A. Temp tc on foil 310degC. Ramping up, 1A/10s to 300A.

 2020-10-13 17:31 All ok at 300A. Temp tc on foil 468degC. Ramping up, 1A/10s to 400A.

2020-10-13 17:31 All ok at 400A. Temp tc on foil 598degC. Ramping up, 1A/10s to 500A.

2020-10-13 17:31 All ok at 500A. Temp tc on foil 700degC. Ramping up, 1A/10s to 600A.

2020-10-13 17:31 All ok at 600A. Temp tc on foil 760degC. Ramping down, 1A/20s to 0A.

2020-10-14 17:09 foils for radiation focusing have been replaced and doubled to reduce transmission. IGP1:1.5e-5T , water leak check ok. Ramping up to 100A 1A/10s.

2020-10-14 17:30 All ok at 100A. Temp tc on foil 60degC. Ramping up, 1A/10s to 500A. 

2020-10-14 17:50 All ok at 200A. Temp tc on foil 378degC. 

2020-10-14 18:10 All ok at 300A. Temp tc on foil 550degC. 

2020-10-14 18:10 All ok at 400A. Temp tc on foil 705degC. 

2020-10-14 18:10 All ok at 500A. Temp tc on foil 816degC.Ramping up, 1A/10s to 600A.

2020-10-14 18:10 All ok at 600A. Temp tc on foil 906degC.Ramping up, 1A/10s to 625A.

2020-10-14 18:10 All ok at 625A, IGP1: 1.3e-5T. Temp tc on foil 924degC.Ramping up, 1A/10s to 650A.

2020-10-14 19:21 All ok at 650A. Temp tc on foil 940degC.Ramping down, 1A/10s to 0A. Pyrometer on foil 1200degC

 2020-10-15 18:51 : Setup installed during the day. Pumped down to IGP1:1.5e-5T , water leak check ok. Ramping up to 100A. 

 2020-10-15 19:30 : A heating element was showing bad signs and failed very early. ramping down and venting. 

 2020-10-27 10:24 setup introduced yesterday. Pumping over night IGP1: 5.7e-7T. Water leak check ok. Performing heating elements check.

 2020-10-27 10:43 Heating elements check show low cooling. Ramping up target 1A/15s to 200A.

 2020-10-27 11:54 all ok 200A, thermocouples show room temperature on cartridge and heat shield. Ramping up target 2A/10s to 300A.

 2020-10-27 11:54 all ok 300A, thermocouples show 28/25degC. Ramping up target 2A/10s to 400A.

 2020-10-27 11:54 all ok 400A, thermocouples show 36.5/29degC. Ramping up target 2A/10s to 500A.

 2020-10-27 11:54 all ok 500A, thermocouples show 48.9/33degC. Ramping up target 2A/15s to 550A.

 2020-10-27 12:43 all ok 550A, thermocouples show 55/34degC. Ramping up target 2A/15s to 600A.

 2020-10-27 12:43 all ok 600A, thermocouples show 61.5/35.2degC. Ramping up target 2A/15s to 625A.

 2020-10-27 13:14 all ok 625A, thermocouples show 64.6/34.2degC. Ramping up target 2A/15s to 650A.

2020-11-02 6:32: roughing on

2020-11-02 7:21: Turbo on for a while, IGP1:1.8e-5T . water leak check ok.

2020-11-02 7:47: IGP1:1e-5T . Ramping up target heater to 200A, 1A/10s.

2020-11-02 7:47: TGHT at 275A, pyrometer at 1300degC. Leaving it hot for 24h.

 2020-11-04 9:06: After 37h treatment, ramping down to 0A.2A/10s.

2020-11-04 9:46: target ramped down. Venting.

2020-11-04 17:30: Big amounts of outgassing non detected in GP1 coated some inner walls in evap2. The walls got cleaned with acetone. All as before now.

Thursday, April 15, 2021, 18:24

Tantalum samples were loaded in a tantalum testing tube and installed in the EVAP2 to heat under vacuum for 3 days at 2000 degC (~500A, 4kW).

The temperature is measured with the Omega pyrometer (slope 0.98)

Some of the samples are in contact with graphite and enclosed with Ta caps, the other samples are not in contact with carbon.

The testing tube is wrapped with 3 Ta heat shields and is not TaC coated.

Thursday, April 15, 2021, 18:31

IGP1 = 4.5e-7 Torr

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

The TGHT will be ramped to 500A at 5A/min

Thursday, April 15, 2021, 20:00

Finished ramping

TGHT = 502 A, 8.22 V, Omega 2012 degC

Sunday, April 18, 2021, 20:38

After 3 days at ~2000 degC, TGHT was ramped at -2A/min to 0A

Aaron Schmidt wrote:

Wednesday, August 07, 2024, 15:36: Roughing. Had initially been roughed & TP started w/ Marla CS, however it timed out. Restarting. Wednesday, August 07, 2024, 15:37: TP on. Wednesday, August 07, 2024, 15:46: Tripped at 4 KRPM. Restarted. Up to 5 KRPM. Failed to start. Thursday, August 08, 2024, 10:00: TP started.  Thursday, August 08, 2024, 10:12: TP Tripped but nearly spun up. Reset & Restarted. TP Green / on.

Thursday, August 08, 2024, 10:43

A cartridge was filled with graphite foils and loaded in an uncoated tantalum tube. The tube was wrapped with four Ta-sheets. A Ta-foil was placed in the tube's right end for measuring the temperature.

Good vacuum 3e-5 Torr

Bad vacuum 5e-5 Torr

Initial IGP1 = 5.06E-7 Torr

Starting ramp at 1A/min to 200 A

Friday, August 09, 2024, 09:40 Pressure started to rise, but temperature is not within pyrometer range yet. Current 42 A, Voltage 0.5 V

Friday, August 09, 2024, 10:46 Pressure started to reduce (peak 1.4e-5 Torr). Temperature is not within pyrometer range yet Current 100 A, Voltage 1.3 V

Friday, August 09, 2024, 11:28 Temperature started to be detected, but not stable enough. Current 135 A, Voltage 1.9 V

Friday, August 09, 2024, 12:54 Temperature 1129 °C, current 196 A, voltage 3 V.

Friday, August 09, 2024, 12:56

Next ramp 0.5A/min while taking temperature readings periodically until 250A

Friday, August 09, 2024, 14:45

IGP1 = 1.0e-6 Torr

Next ramp 1A/min to 480 A aiming at 2000 °C

Friday, August 09, 2024, 17:13

IGP1 = 1.9e-6 Torr, Current 327A, Voltage 5.3V

Ramp changed to 2A/min to 480 A aiming at 2000 °C

Coolded down after 4 hours at ~2000°C

at -2A/min

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

Monday, November 07, 2022, 14:24

The coated container tube was wrapped in four Ta foil heatshields.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final TGHT current= ~400A (adjustable)

Heating autoramp starged at 4A/min to 40A

Then at 1A/min on both heaters to 120A.

Good vacuum = 5.0 e-02 Torr

Bad vacuum = 5.0E-04 Torr

 IGP1 initial =

Wednesday, May 24, 2023, 15:22

A Ta container tube was wrapped with 4 Ta heatshields.  Note final container is 45220-11

219 graphite discs were loaded.

a TaC coated Ta spring at the front end.

The system was left to establish vacuum over previous night.

Good vacuum set to5e-04Torr

Bad vacuum was set to 5e-2 Torr

Total weight of system including spring= 250.1 g

OMEGA slope = 0.99

The target will be heated to 2000 C, held there for 10 hours. 

Initial ramp at 1A/min to 200A

Then ramp at 0.5A/min while taking temperature readings periodically unti l250A.

At 250 A will let pressure stabilize and then ramp at 1A/min to 2000C or 450A.  

Will hold at target Temperature or Current for 10 hours before starting ramp-down.

 Wednesday, May 24, 2023, 15:50

Currently heating at 0.5A/min to250A.  Taking temperature/current measurements

IGP1= 1.06e-06 Torr

Wednesday, May 24, 2023, 18:28

heating at 1A/min to 275A to collect more temperature data

Wednesday, May 24, 2023, 19:22

Slight offset between set and RD current observed. 

Ramping at 1A/min to 440A according to the regression below

Should be around 2000 C.

Wednesday, May 24, 2023, 20:22

Currently at 339 A, 4.8V

OMEGA = 1614 C, IGP1= 2.04e-06 Torr

Will ramp up at 2A/min to 450A as new data point suggests

Wednesday, May 24, 2023, 21:05

heating curve has new slope suggesting 500A as minimum to reach 2000 C

Increasing ramp to 1A/10s to reach 450A

Wednesday, May 24, 2023, 21:17

TGHT

IGP1= 3.9e-06 Torr

Continue ramping to 480A

Wednesday, May 24, 2023, 22:11

Offset between setpoint of current and readback.  readback 10A below. 

Will keep at this setting until 7:30 am tomorrow then start ramp down @-2A/min

Thursday, May 25, 2023, 07:25

OMEGA=1912C, IGP1 =1.29e-06 Torr, TGHT = 480A, 9.0V

begin ramp down at -2A/min

Thursday, May 25, 2023, 09:52

Some odd current readback behaeviour noticed.  Have contacted Gelo from controls.  He will look at it next week.  Discrepancy between read back and set point and drop in read back currrent. See picture

Tuesday, June 06, 2023, 09:11

A Ta container tube was wrapped with 4 Ta heatshields.  Note final container is 45220-6

272 graphite discs were loaded.

a TaC coated Ta spring at the front end.

The system was left to establish vacuum over previous night.

Good vacuum set to5e-04Torr

Bad vacuum was set to 5e-2 Torr

Total weight of system including spring= 253.94 g

OMEGA slope = 0.99

The target will be heated to ~2000 C, held there for 10 hours. 

Initial ramp at 1A/min to 200A

Then ramp at 0.5A/min while taking temperature readings periodically unti l250A.

At 250 A will let pressure stabilize and then ramp at 1A/min to 2000C or 480A.  Will use read back current

Will hold at target Temperature or Current for 10 hours before starting ramp-down.

Tuesday, June 06, 2023, 09:14

 Starting ramt at 1A/min

initial IGP1= 8.2e-07

Tuesday, June 06, 2023, 21:25

@480 A on readback, 1823C on OMEGA.  ramping to 510A set point which should be around 490 RD.  (see heating profile for details)

Tuesday, June 06, 2023, 22:02

ramped to 516 on RD 527 on set.  Will leave for 10 hours

OMEGA =1930 C

Wednesday, June 07, 2023, 06:32

OMEGA at 1950 C this morning.  Will continue heating.  Lowered to 1940 C as in experiment 1 this was the top temperature.

Wednesday, June 07, 2023, 07:40

OMEGA= 1940 C

IGP1=1.7-6 Torr

TGHT= 513A, 9.4V

starting ramp down at -2A/min

Thursday, September 29, 2022, 09:57

A Ta container tube was wrapped with 3 Ta heatshields.

338 graphite discs were loaded.

one Tantalum cup (modified to fit losely) was inserted on the front end along with a Ta spring.

on the backside there is no spring but four discs glued together with PVA

The system was left to establish vacuum over night.

Good vacuum set to5e-04Torr

Bad vacuum was set to 5e-2 Torr

Total weight of system including springs = 249.07 g

OMEGA slope = 0.99

The target will be heated to 2100 C, held there for 10 hours.  The target Temperature vs Power will be tabulated and the current required to reach 2100 will  be extrapolated to avoid using OMEGA at higher temperatures.

a)  The target will be removed, weighed and inspected

b) If the target boat is still good, run again at 10A higher than previous for 2 hours.

c) The target will be removed, weighed and inspected

d) i) If the weight is the same or negligible, experiment ends

  ii) if the weight has decreased and target still intact, repeat from step b and document all measurements and settings

 Thursday, September 29, 2022, 10:04

IGP1= 1.4e-04 Torr

TGHT= 80.0 A, 1.0V

Will allow pressure to drop and then continue heating

Thursday, September 29, 2022, 10:20

IGP1= 7.9e-05 Torr pressure on downward trend

Start heating at 2A/min to 200A

The target started dropping in temperature as current increased.  Suspected OMEGA issue.

Started cooling at -2A/min

Will continue next week.

Monday, October 03, 2022, 11:05

Upon inspection, the window though which the OMEGA laser travels was coated with dark precipitate (mostly a spot in the direct path of the laser).

Cleaned the window and started pumpdown.

Monday, October 03, 2022, 12:57

start heating @2A/20s = 6A/min because the target had previously been heated past additive evaporation point.

IGP1= 3.8e-06 Torr

Monday, October 03, 2022, 18:41

Will heat to 500A and leave for 10 hours.  The regression shows too high current to reach 2100.  Not reasonable.  So will work with 500A as a baseline.

Tuesday, October 04, 2022, 06:52

Temperature @500 A read 1742C

maintained for 10 hours

start rampdown at -2A/min 

OMEGA currently 1099C

Current = 500 A

Voltage =9.9 V

IGP1= 5.9e-7 Torr

Tuesday, October 04, 2022, 21:32

Quartz window was completely covered with graphite like dust.  final weight after heating = 244.57 g (a couple of discs came loose and they were weighed separately and not included in the next heating).

weighted target and added one extra heatshield because it looked like a lot of heat was escaping.  Will treat at 500A again for 2 hours.  The extra heat-shield should provide hotter environment.

new initial weight = 254.24 g (don't have a balance with greater precision .

Wednesday, October 05, 2022, 07:42

IGP1= 3.8e-07 Torr

ramping to 280A @ 3A/min

Wednesday, October 05, 2022, 11:40

ramping to 350 @ 3A/min

Then ramp to 500A

500A at 12:50

Wednesday, October 05, 2022, 15:52

ramping down at -2A/min

Thursday, October 06, 2022, 09:27

IGP1= 1.8e-07 Torr

Will dismount and weigh, then decide how to proceed

according to second regression, second heating was ~2000 C.  OMEGA not reliable after 1700 C in this case. 

Thursday, October 06, 2022, 12:34

The final weight after the second heating was = 254.19 g

reinstalled target and cleaned quartz window. 

will heat up to 510 A

Friday, October 07, 2022, 07:46

IGP1=  3.0 e-07 Torr

ramp at 2A/min to 500A.  will pause to take data points for regression.

Friday, October 07, 2022, 13:05

Start rampdown after two hours at 500A, 10.3V

-2A/min

Tuesday, October 25, 2022, 12:18

Container wrapped in 4 Ta foil heatshields

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~420A (adjustable)

Heating autoramp started at 2A/min on both TGHT and TBHT to40A

Then at 1A/min on both heaters to 120A.

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Wednesday, October 26, 2022, 07:07

IGP1= 7.5e-7 Torr

start ramp at 2A/min to 40A

Ramped at 1A/min to 120A then held until pressure drop.  Then ramped @ 4A/min to 400A on TGHT.

Wednesday, October 26, 2022, 14:09 

Manually rampted TGHT to 415A, 6.9V will hold for 4 hours 

OMEGA reads 1870 C initially

Thursday, October 27, 2022, 09:44

was held for 5 hours due to technical issues but should be ok.

OMEGA @ time of rampdown = 1830C

Rampdown @-2A/min TGHT and -1A/min TBHT

IGP1= 3.5e-07 Torr

 Ta#60 LP-SIS target description:

Total Ta foils = 470 [6x20 packs + 350 single discs]

Foil Thickness = 0.025mm

Target density =  14.081 g/cm3

Target length = 3.33 cm

Total Mass =  46.891 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  445g w/ end caps)

Discs in target are arranged as follows: 1pack / 75singles / 1pack / 100singles / 2packs / 100singles / 1pack / 75singles / 1pack

End caps installed (Expanded). No Ta heat shield added.

https://elog.triumf.ca/TIS/Target+Production/98

Monday, June 01, 2020, 11:38: Roughing.

Monday, June 01, 2020, 12:03: Turbo pump on. 

TBHT will be ramped up to 230A at 1.0A/min.

TGHT will be ramped up to 600A + at 2.0A/min.

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Tuesday, June 02, 2020, 07:13: Omega slope set to 0.98. Power supplies / sources on. vacuum@ 5.13e-07T.

Tuesday, June 02, 2020, 07:16: Manually tap up TGHT / TBHT to 40 / 5 A. Vacuum @ 5.08e-07T.

Tuesday, June 02, 2020, 07:19: Auto-ramping TGHT / TBHT @ 2 A per min to 350 / 150 A. 

Tuesday, June 02, 2020, 10:02: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 450 / 200 A. Vacuum @ 1.39e-06T. TGHT Voltage= 5.955V. Omega: 1288 deg C.

Tuesday, June 02, 2020, 11:54: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 500 / 230 A. Vacuum @ 1.85e-06T. TGHT Voltage= 7.998V. Omega: 1528 deg C.

Tuesday, June 02, 2020, 13:16: Auto-ramping TGHT @ 2 A per min to 550 A. Vacuum @ 2.51e-06T. TGHT Voltage= 9.060V. Omega: 1625 deg C. 

Tuesday, June 02, 2020, 13:58: Auto-ramping TGHT @ 2 A per min to 600 A. Vacuum @ 3.53e-06T. TGHT Voltage= 9.060V. Omega: 1728 deg C. 

Tuesday, June 02, 2020, 14:23: Auto-ramping TGHT @ 2 A per min to 625 A. Vacuum @ 5.56e-06T. TGHT Voltage= 11.236V. Omega: 1821 deg C.

Tuesday, June 02, 2020, 14:36: TGHT / TBHT 625 / 230 A. Vacuum @ 6.65e-06T. TGHT Voltage= 11.724V. Omega: 1865 deg C. 

Tap up TGHT manually.

Tuesday, June 02, 2020, 14:48: TGHT / TBHT 643 / 230 A. Vacuum @ 7.24e-06T. TGHT Voltage= 12.129V. Omega: 1901-1903 deg C.  

Desired temperature = 1900C reached.

Tuesday, June 02, 2020, 22:20: TGHT / TBHT 643 / 230 A. Vacuum @ 2.05e-06T. TGHT Voltage= 12.212V. Omega: 1901-1903 deg C. 

Tuesday, June 02, 2020, 22:22: Auto-Cooling @ 1 A per min. 

Wednesday, June 03, 2020, 06:08: TBHT @ 0. TGHT set for Auto-Cooling @ 2 A per min.

Wednesday, June 03, 2020, 11:38: PS off. Turbo pump off. 

Wednesday, June 03, 2020, 12:40: Venting. 

 Thursday, June 11, 2020, 09:56

Previous day (Wednesday June 10, 2020) 

Container coated with TaC and wrapped with 3 Ta heat shields.

Desired temperature= 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max).

Good vac at 3.00e -5 Torr

Bad vac at 5.00e-5 Torr

Chamber pump down

Thursday, June 11, 2020, 10:19

IEVAP2:IGP1=1.06e-6 Torr

ramping to 40A (TGHT and TBHT) at 1A/min

Thursday, June 11, 2020, 12:35

IEVAP2:IGP1=1.8e-6 Torr

TGHT = 39.8 A, 0.45V

TBHT=38.5 A, 0.48V

Manually rampted to 45A on both TGHT and TBHT 

Thursday, June 11, 2020, 12:58

IEVAP2:IGP1=1.6e-6 Torr

TGHT = 34.8 A, 0.52V

TBHT=44.2A, 0.55V 

Start Autoramp at .5A/min to 400A on TGHT and 230A on TBHT

Thursday, June 11, 2020, 17:14

Irregular pressure profile.  Cooling .  Need to check for leak.

TGHT = 99 A 1.3 V

TBHT = 99 A 1.4 V

Friday, June 12, 2020, 12:59

Restarting ramping

IGP1= 4.98e7 Torr

Autoramp at 1A/min to 400A on TGHT and 230A on TBHT

(pressure and TGHT current and voltage profile seem normal compared to previous coating sintering with the same power supply)

Friday, June 12, 2020, 14:40

Paused ramping

TGHT = 90A

After a few minutes the profile (noise) was still there.  Continue autoramp at 0.5A/min to 400 A on TGHT and 230A on TBHT

Friday, June 12, 2020, 15:21

IGP1= 1.97e-06 Torr trending down

TGHT = 111.5 A , 1.5 V

TBHT = 112.9 A, 1.9 V

Increase ramping speed to 1A/min to 400A on TGHT and 230A on TBHT

Friday, June 12, 2020, 20:50

OMEGA = 1754 C

IGP1= 2.5e-6 Torr

TGHT = 394.1 A, 6.6 V

TBHT = 232.8 A, 4.0 V 

Tapping to 1900 C

Friday, June 12, 2020, 21:00

OMEGA =1901 C

IGP1= 5.6e-6 Torr

TGHT = 448.3 A, 7.5 V

TBHT = 232.8 A, 4.1 V

Saturday, June 13, 2020, 00:51 

 OMEGA = 1898 C

IGP1 = 2.0e-6 Torr

TGHT = 447.2 A, 7.5 V

TBHT = 232.9 A, 4.1 V

Start cooling at -2A/ min for TGHT and -1A/min for TBHT

 Wednesday, March 18, 2020, 07:10

Ta tube was coated with TaC and wrapped with Ta heat-shields (3 layers)

Desired temperature= 1900 C (expected TGHT ~430 A), TBHT will be set fixed at 230A (max).

Evap 2 was pumped down on the previous night.

Good vacuum= 3.00 e-5 Torr

Bad vacuum = 5.00 e-5 Torr

Ramped TGHT and TBHT to 40A at 0.5A/min

Initial pressure IGP1 = 4.8e-7Torr

 Wednesday, March 18, 2020, 09:29

After an hour pressure reduced to 5.45e-6 Torr

TGHT; 0.518 V, 40.5 A

TBHT: 0.41 V, 38.6 A

Autoramp TGHT and TBHT at 1A/min to 400A and 230A respectively.

 Wednesday, March 18, 2020, 18:29

TGHT = 400A, 6.6V, TBHT= 232.9, 3.9V

OMEGA = 1240 C, this is 500 degC lower than previous LP-SIS at same conditions

https://elog.triumf.ca/TIS/Evaporator_2/464

Start autoramp to 460A on TGHT at 1A/min

Wednesday, March 18, 2020, 20:51

TGHT: 464 A, 7.75 V

Temperature 1328, I won't increase the temperature because there is a chance that the reading is 500 degC off and the target is sitting at 1828 degC instead of 1328 degC 

Wednesday, March 18, 2020, 23:17

After ~4 hours at 1317 degC according to the pyrometer:

TGHT = 7.7 V, 457.8 A,

TBHT = 3.9 V, 232.9 A,

IGP1 = 1.16e-6

Commence cooling at -2A/min for TGHT and -1A/min for TBHT

Thursday, March 19, 2020, 15:53

Venting and dismounting.

The coating does not have the quality to be used online, another LP-SIS will be coated and sinter

 Sunday, May 24, 2020, 06:54

Ta tube was coated with TaC and wrapped with Ta heat-shields (3 layers)

Desired temperature= 1900 C (expected TGHT ~430 A), TBHT will be set fixed at 230A (max).

Evap 2 was pumped down

Good vacuum= 3.00 e-5 Torr

Bad vacuum = 5.00 e-5 Torr

Ramped TGHT and TBHT to 40A at 0.5A/min

Initial IGP1 = 2.5e-7 Torr

Sunday, May 24, 2020, 08:24

Autoramp deliver 40 A

TGHT = 0.58 V, 39.6 A

TBHT = 0.46 V, 39.81 A

IGP1 = 2.9 e-7 Torr and increasing

Heater conditions will be hold for 15 min to account for pressure changes.

 Sunday, May 24, 2020, 08:39

IGP1 = 2.7e-7 Torr and decreasing

Autoramp TGHT and TBHT at 1A/min to 400A and 230A respectively.

 Sunday, May 24, 2020, 14:57

After 15 min the autoramp stopped

TGHT = 6.8 V, 394.65 A

TBHT =4 V, 232.9 A

IGP1 = 2.2e-6 Torr and going down

Omega = 1747 degC

Autoramp set to TGHT 1A/min to 450A

Sunday, May 24, 2020, 16:07

After 15 min the autoramp stopped

TGHT = 7.7 V, 448 A

IGP1 = 2.88e-6 Torr

Omega = 1886 degC

The current will be increased manually to reach 1900 deg C

Final TGHT = 7.9 V, 453.15 A (455 A input)

Omega = 1899 degC

The TGHT and TBHT will leave at current conditions until pressure reduce (approx 4 hours)

Sunday, May 24, 2020, 20:01

TGHT = 7.9 V, 456 A

TBHT = 4 V, 232.9 A

IGP1 = 1.8e-6 Torr

Omega = 1893 degC

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

 Thursday, July 16, 2020, 11:15

Coated Ta tube cotaining 233 SiC disks wrapped with Ta heat-shields (3 layers)

Desired temperature= 1800C (expected TGHT 410 A), TBHT will be set fixed at 230A (max).

Evap 2 was pumped down

 Friday, July 17, 2020, 08:49

 Sunday, July 19, 2020, 17:35

IGP1 = 2.6e-06 Torr

TGHT = 400 A, 7.2 V

TBHT = 233 A, 4.1 V

Tap manually  to 410 (expected 1800 C )

Note*  OMEGA reading cannot be obtained.  

Leave at 410 A on TGHT for 4 hours.

Sunday, July 19, 2020, 22:57

IGP1 = 7.0 e-07 Torr

TGHT= 410 A , 7.2 V

TBHT = 233 A, 4.2 V

Start cool down at -2A/min for TGHT and -1A/min for TBHT

 Monday, July 20, 2020, 12:20

IGP1 = 2.2e-07 Torr

Unloading target

Monday, July 20, 2020, 19:27 

Coated Ta tube cotaining 355 SiC disks wrapped with Ta heat-shields (3 layers)

Desired temperature= 1800C (expected TGHT 410 A), TBHT will be set fixed at 230A (max).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap 2 was left to pump down over night.

 Monday, July 20, 2020, 23:06

IPG1 = 3.1e-06 Torr

Start autoramp at .25A/min to 40A for both TGHT and TBHT

Tuesday, July 21, 2020, 08:06

TGHT = 40.3 A, 0.51 V

TBHT = 39.0 A, 0.46 V

increase auto ramp limit to 50 A for both TGHT and TBHT 

IGP1=1.8e-05 Torr

Tuesday, July 21, 2020, 16:22

IGP1= 1.5 e-05 Torr 

TGHT = 50.1 A, 0.65 V

TBHT = 50.0 A, 0.60 V

 Change ramp target to 350 A for TGHT and 230A for TBHT

Wednesday, July 22, 2020, 13:24

Stopped autoramp.  Will allow pressure to drop. 

TGHT = 64.0 A, 0.86 V

TBHT = 64.5 A, 0.82 V 

Thursday, July 23, 2020, 23:55

TGHT Reached 430 A,  7.7 V

OMEGA reads 1310 C but reading is not considered accurate so will leave at this current for 4 hours.

Friday, July 24, 2020, 11:31

IGP1 = 1.98e-07 Torr

Window for pyrometer was coated with condensate.  

Dismounted target and cleaned two windows in line with the pyrometer.