Darwin Ortiz Rosales wrote:

Friday, September 25, 2020, 10:30  Target boat with a layer of niobium foil on the bottom is used to heat up Nb samples to 1400 C for 4 hrs. OMEGA slope = 0.99 The niobium samples are wrapped in two layers of  Nb foil. Boat is wrapped with 2 layers of Ta foil, careful to avoid touching samples.  Friday, September 25, 2020, 10:35 Manually ramped TGHT to 40 A and kept at that current for approximately 15 minutes.   Then started autoramp at  1A/min up to 100 A  Friday, September 25, 2020, 16:58 IPG1= 4.7e-07 Torr TGHT =100.0 A, 1.3 V Start autoramp to TGHT to 300 A  @ 2A/min  @ 300A temperature = 1179 C   Friday, September 25, 2020, 20:00  autoramp to 345 A  Friday, September 25, 2020, 20:39 TGHT = 345 A, 5.4 V OMEGA = 1296 C IPG1= 8.1 e-07 Torr Ramp manually to 1400 C  Friday, September 25, 2020, 20:51 reached 1400 C on OMEGA at TGHT = 476 A Friday, September 25, 2020, 20:59 OMEGA increased to 1410, lowered TGHT to 468 A to get back to 1400 C on OMEGA  Friday, September 25, 2020, 21:40 Lowered TGHT to 463 A,  5.79 V to bring OMEGA to 1400 C from 1404 C  Saturday, September 26, 2020, 00:51 Sample has been at 1400 C for 4 hours. IGP1= 7.2 e-07 Torr Cooling at- 2A/min

 Monday, September 28, 2020, 09:36

Vented chamber - for Darwin.

Monday, September 28, 2020, 11:49

6 discs of np-SiC were loaded to the target boat wrapped with 3 layers of heat shields.

Desired temperature at 1500 C, (As per e-log 414/416, TGHT = 450A/7.31V, 3.28kW) 

Omega slope set at 1.05 (for carbide)

Good vac = 3.0e-5 Torr,

Bad vac = 5.0e-5 Torr.

Pumping down in progress

 Monday, September 28, 2020, 21:44

Pressure at 1e-6 Torr.  Initiated autoramping at 0.2A/min to reach 300 A.  Monitor temp.

 Wednesday, September 30, 2020, 11:39

TGHT reached to 300 A/ 4.5V, temp at 1130 C.  No coating on windows.

Continue to ramp up 330A.  Monitor temp.

 Wednesday, September 30, 2020, 16:38

TGHT reached 330 A / 5.04 V, temp at 1190 C. 

Ramp up to 400 A. Current pressure at 9.8 e-7 Torr.

Thursday, October 01, 2020, 10:28

TGHT reached 400 A/ 6.3V, temp at 1320 C.  Continue to ramp up to 450 A.

 Thursday, October 01, 2020, 16:44

TGHT reached to 450 A/ 7.4 V.  TEmp at 1500 C. 

Pressure at 1.35 e-6 Torr and coming down.   Continue to hold TGHT at 1500 C for at least 24 hr.

 Sunday, October 04, 2020, 16:49

TGHT has been holding at 450 A/ 7.3 V for nearly 3 days; temp has gone up and stabilized at 1554 C; pressure at 2.13 e -7 Torr.

Initiated cooling down at -2A/min.

 Monday, October 05, 2020, 10:02

Chamber vented.

 2020-10-09 9:48 The target was installed the day before and left pumping over night. IGP1=4.7e-7Torr. leak check when water on, ok. Setting ramp up

 2020-10-09 10:16 Ramping up the target to 50A, 1.5A/30s. All good. Going to 200A same rate.

 2020-10-09 11:11 Target at 200A. Pyrometer 1170degC. ramping to 300A same rate. 

 2020-10-09 11:51 Target at 300A. Pyr. 1510. Ramping to 400A same rate.

 2020-10-09 12:27 Target at 400A. Pyr. 1820. Ramping to 500A same rate.

 2020-10-09 13:01 Target at 500A. Pyr. 2100. Ramping down to 0A 2A/30s.

 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. 

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?

 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.

 2020-11-04 17:31: target installed with boat containing graphite container for outgassing. Roughing pump on.

 2020-11-04 17:49 turbo on, leaving it pumping over night.

 2020-11-05 11:32 leak check ok. Ramping up target to 200A 2A/10s.

 2020-11-05 11:53 IGP1:1.1e-6T . Ramping up target to 300A 1A/10s.

 2020-11-05 11:53 IGP1:1.2e-6T . Pyrometer:1320degC. Ramping up target to 400A 1A/10s.

 2020-11-05 11:53 IGP1:1.8e-6T . Pyrometer:1650degC. Ramping up target to 500A 1A/10s.

 2020-11-05 12:57 IGP1:3.4e-6T . Pyrometer:1910degC. Ramping up target to 525A 1A/10s.

 2020-11-05 13:02 IGP1:3.6e-6T . Pyrometer:1990degC. Leaving it hot for 1h.

 2020-11-05 14:00 IGP1:2e-6T stable . Pyrometer:1990degC. cooling down 2A/10s.

 2020-11-05 15:44 empty and naked boat in for heating up system and clean up. Turbo on.

 2020-11-06 16:58 IGP1:4e-7T leak check ok. Ramping up target to 500A. 1A/10s.

 2020-11-09 12:43 The target was left at 1500degC during the weekend. 

 2020-11-17 14:11 turbo pump off. Slow venting.

 2020-11-18 09:18 Evap2 vented. Target removed.

Tuesday, November 24, 2020, 09:23

A batch of 60 discs of 18 mm diameter were loaded in a tantalum tube. The tantalum tube was wrapped with 3 layers of Ta foil for heat shielding and mounted in the EVAP2. EVAP2 pumped down overnight and Aaron made a leak test this morning (elog 524). 

The target material will be heated to 1990 degC. To measure the temperature, the tube has a Ta foil close to the graphite foils and it is held in place with a tantalum spring. Another Ta spring holds the graphite foils in the opposite side of the tube. The temperature will be measured with the Omega pyrometer (slope 0.99)

IGP1 = 6e-7 Torr. Note: The pressure has an usual behavior (see 2020-11-24-IGP1  and 2020-11-24IGP1-zoom out). After ~9 hrs, the pressure became stable (see 2020-11-24IGP1 -stable)

Tuesday, November 24, 2020, 13:00

IGP1 = 6.7e-7 Torr

Good vacuum of 3e-2 Torr and Bad vacuum 5e-2 Torr

The autoramp is set to 80 A at 1 A each 10 s 

 Tuesday, November 24, 2020, 13:43

IGP1 = 2.7e-5 Torr

TGHT = 1.13 V 80.5 A

Autoramp is set to to 100 A at 1 A each 20 s

Tuesday, November 24, 2020, 13:57 

IGP1 = 2.5e-5 Torr and going down

TGHT = 100.2 A, 1.47 V

Autoramp is set to to 120 A at 1 A each 20 s

Tuesday, November 24, 2020, 14:06 

IGP1 = 2.09e-5 Torr

TGHT = 1.6 v, 122 A

Autoramp is set to 200 A at 2 A each 10 s

Tuesday, November 24, 2020, 14:18 IGP1 = 5.4e-5 Torr

IGP1 = 1.5e-5 Torr

TGHT = 2.9 V, 200.5 A

Omega = 1123 °C

Autoramp is set to 450 A, conditions:

2 A each 10 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr 

Tuesday, November 24, 2020, 14:45

The autoramp was stopped at 424 A 

TGHT = 421.65 A, 8.353 V

IGP1= 2.5e-5 Torr and going down

Omega 2020 degC

The TGHT current was reduced to 420 A (8.27 V) and the temperature reduced to 2007 degC

Tuesday, November 24, 2020, 21:03

IGP1 = 2.09e-6 Torr

TGHT = 7.899 V, 421.312 A

Temperature = 1870 degC

Autoramp is set to 0 A at 1 A/min 

Monday, February 01, 2021, 13:52  

Ta boat loaded with 20 Disc on either end capped with Ta springs to prevent overexpansion.   discs wrapped Graphite foil and boat wrapped in Ta heat-shields (3 layers).

Sample A on left side and sample B on right side.

Desired temperature= 1800C (expected TGHT 410 A).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap2 left to pump down over night.

 Tuesday, February 02, 2021, 10:01

Pressure stable at IGP1= 7.8e-7 Torr

TGHT autoramp  set to 50 A @ 1/min

Tuesday, February 02, 2021, 13:45

IGP1=3.5e-6 Torr

TGHT =49.9 A, 0.56 V

Ramp at 1A/min to 100A

Wednesday, February 03, 2021, 08:25

IGP1= 5.5 e-07 Torr

TGHT = 100 A, , 1.2 V

Yesterday the camera failed to operate.  Cloud service discontinued.  The TS camera is offline but it is a different provider.  Will start ramping to 400A .

Ramp rate 2A/min

Wednesday, February 03, 2021, 15:55

ramped up to 520 A and 9.1V TGHT

Temperature average 1644 C but suspect actual temperature higher.

Held for 5 hours and started ramp down at -2A/min

Thursday, February 04, 2021, 9:35

IGP1= 2.99e-7 Torr

Begin pumpdown procedure and remove container

Note:  SiC evaporation on most discs.  The temperature was too high.  Need to repeat.

Saturday, February 13, 2021, 08:10

Ta boat loaded with 80 discs enclosed in graphite foil in pockets of 20.  Sample A at both ends and sample B in the middle spaced out. Boat wrapped in Ta heat-shields (3 layers).

(A B B A)

Desired temperature= 1800C (expected TGHT approx 410 A).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap2 left to pump down over previous night.

IGP1= 5.4e-7 Torr and stable

Initiating TGHT ramp up at 1 A/ min to 30 A

Saturday, February 13, 2021, 12:19

IGP1= 6.9e-06 Torr

Ramp to 50 A 1A/min

Saturday, February 13, 2021, 14:35

IGP1 = 6.4e-6 Torr

Pressure trending down. 

Saturday, February 13, 2021, 14:56

IGP1= 4.9 e-6 Torr

Initiate Ramp up @ 1 A/min to 400 A

Changed ramp up to 0.5 A/min at around 11:30 pm

Sunday, February 14, 2021, 11:43

The current will be ramped up to 420 A according to the trendline approximation (see attachement 1)

Sunday, February 14, 2021, 12:26

IGP1 = 8.9 e-06 Torr and trending down

TGHT = 420 A, 7.5 V

OMEGA = 1730 C

Will ramp up to 428 A manually 

Sunday, February 14, 2021, 12:30

Reached 428 A on TGHT.  

OMEGA = 1760 C

Will bump to 430 A and hold for 4 hours

OMEGA= 1765 C

Sunday, February 14, 2021, 18:00

OMEGA = 1789 C

IGP1= 7.5 e -7 Torr

TGHT = 430.5 A , 7.8 V

Start ramping down at -1A/min to zero A

 Tuesday, March 16, 2021, 08:28 

Each endcap is separated with a disc of graphite foil and rolled into packs of 5 within a foil envelope in a target boat.

There are also 4 coated springs, one in between endcaps and three on the ends

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

Chamber pumping down

OMEGA slope = 0.99

Will ramp TGHT up to 40 A then autoramp to 400A at 1A/min.

Final desired temperature on OMEGA (tap)= 1800C

Tuesday, March 16, 2021, 11:22

 IGP1= 3.5e-06 Torr

TGHT = 40A, 0.4V

Will ramp up at 1A/min to 400 A

Wednesday, March 17, 2021, 08:06

IGP1=  2.98 e-07 Torr

TGHT = 400 A, 4.3V

OMEGA shows no temperature reading.  Will ramp up to 450A at 1A/min

Wednesday, March 17, 2021, 08:58

OMEGA still shows no reading

IGP1= 4.2e-07 Torr

ramping to 470A @ 1A/min 

Wednesday, March 17, 2021, 09:21

OMEGA no reading

IGP1 = 4.4 e-07 Torr

TGHT = 470 A, 5V

ramp up to 490 A at 1A/min

Wednesday, March 17, 2021, 11:05 

TGHT at 490 A, 5.2 V since 10 am.  Will start cooling at 2 pm.  

Wednesday, March 17, 2021, 13:47

TGHT = 493A, 5.3V

IGP1= 3.2e-07 Torr and stable

Start ramp down at -2A/min

Thursday, March 18, 2021, 11:20 

The boat was dismounted but the materials had not sintered properly.  The boat looked very twisted.  Everything was transferred to a new boat with uncoated Ta caps at either end.  

It was left overnight to establish vacuum.

Friday, March 19, 2021, 08:23

IGP1= 2.2 e-07 Torr

initiate heating at 1A/min on TGHT to 60 A

Friday, March 19, 2021, 10:04

IGP1= 3.6 e-07 Torr

TGHT = 60 A, .73 V

Ramp up to 450 A @ 2A/min

Friday, March 19, 2021, 14:26

OMEGA 1895 at 455A, 8.4 V

manually ramp down to 1800C

OMEGA 1800C at 416A, 7.6V

will leave like that for 3 hours more

Friday, March 19, 2021, 17:12

OMEGA 1795 C

 TGHT = 415A, 7.6V

IGP1= 6.8e-07 Torr

Start ramp down at -2A/min

Monday, March 22, 2021, 23:07 

Marla removed from Evap 2.  Sintering vwas very good.  The container with Ta caps is better for sintering these pieces.

 2021-04-04 16:07 New container is in with heatshields, vacuum 8.6E-6 torr. leak check done. ramping up current, checking both pyrometer and TC, 1A/10s.

 2021-04-04 16:49 200A TGHT 250degC on TC 1130degC on pyrometer. Too low on TC, ramping down and venting to reposition TC in the foil. 

 2021-04-04 18:00 TC was slightly broken, repaired now. Pumping chamber.

 2021-04-04 18:41 ramping up to 200A 1A/10s.

2021-04-04 18:41 200A TGHT, TC 389degC pyro 1130degC. ramping to 400A 1A/10s.

2021-04-04 18:41 300A TGHT, TC 554degC pyro 1440degC. 

2021-04-04 18:41 400A TGHT, TC 735degC pyro 1720degC. ramping to 600A 1A/10s. 

2021-04-04 20:15 500A TGHT, TC 891degC pyro 1990degC

2021-04-04 20:15 553A TGHT, TC 975degC pyro 2129degC, ramping down.

2021-04-06 13:44 Parasitic target plus thermocouples were introduced in evap2 the day before and put under vacuum. IG1 3E-7 torr, leak check done. Putting some power into HE while ramping up container to 100A 1a/10s.

2021-04-06 14:06 20W on HE 100A on target container. Everything stable. Ramping up to 200A 1A/10s 

2021-04-06 14:06 20W on HE 200A on target container. Everything stable. Ramping up to 300A 1A/10s 

2021-04-06 14:06 20W on HE 300A on target container. Everything stable 4.6E-7 torr. Ramping up HE to 40W.

2021-04-06 14:06 40W on HE 300A on target container. Everything stable 4.6E-7 torr. Ramping up container to 400A 1A/10s.

2021-04-06 14:06 40W on HE 400A on target container. Everything stable 1E-6 torr. Ramping up container to 500A 1A/10s.

2021-04-06 15:52 35W on HE 500A on target container. Everything stable 1.6E-6 torr. Ramping up He to 65W.

2021-04-06 18:40 at 50W on HE one of them broke, system ramped down, vented, HE replaced, pumping down system again.

2021-04-07 10:38 HE at 70W, ramping up container to 200A 1A/10s. Vacuum 3.3E-7 torr.

2021-04-07 10:59 HE at 70W, 200A on container, ramping up container to 300A 1A/10s. Vacuum 3.9E-7 torr.

2021-04-07 10:59 HE at 65W, 300A on container, ramping up container to 400A 1A/10s. Vacuum 4.5E-7 torr.

2021-04-07 11:50 HE at 70W, 400A on container, ramping up container to 500A 1A/10s. Vacuum 7.8E-7 torr.

2021-04-07 11:50 HE at 65W, 500A on container, ramping up container to 553A 1A/10s. Vacuum 1.4E-6 torr.

2021-04-07 11:50 HE at 65W, 553A on container. All good, ramping down. 1A,10s.

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

 Friday, June 11, 2021, 08:05

Target boat with a layer of niobium foil on the bottom is used to heat up Nb samples to 1100 C for 4 hrs.

OMEGA slope = 0.99

The niobium samples are wrapped in a layer of  Nb foil.

Boat is wrapped with 2 layers of Nb foil.

Good vacuum 3.00e-02 Torr

Bad vacuum 5.00e-02 Torr

Autoramping TGHT at 2A/min to 50A then to 100A, then monitor until desired temperature

Initial IGP1= 9.4e-07 Torr

Friday, June 11, 2021, 09:59

TGHT = 200 A, 2.7V

IGP1=  9.8e-07 Torr

Tap to 1100C

Friday, June 11, 2021, 10:09 

Temperature reached at 10:05 am.

TGHT = 224A, 3.1V

IGP1= 1.0e-06 Torr

OMEGA= 1100C +/- 10C fluctuations

Friday, June 11, 2021, 14:10

TGHT = 224A, 3.1V

IGP1= 9.2e-.07 Torr

OMEGA = 1100C +/-  10C fluctuations

Started rampdown at -3A/min

 2021-07-21 4:44pm Vacumm at 1e-5Torr. Water cooling leak check ok.

 2021-07-21 4:54pm ramping up TGHT to 200A 1A/10s.

2021-07-21 5:31pm 200A TGHT, TC 94degC pyro 1100degC. TC very low, ramping down and venting.

2021-07-22 5:00pm Parasitic prototype target installed, Vacuum 3e-5T, leak check ok. Power on HE of parasitic target.

2021-07-22 5:14pm vacuum 2e-5T. Ramping up container to 100A , 1A/10s.

2021-07-22 5:33pm vacuum 1e-5T. All good at 100A. Ramping up container to 200A , 1A/10s.

2021-07-22 5:54pm vacuum 8.2e-6T. All good at 200A pyro at 1100degC. Ramping up container to 300A , 1A/10s.

2021-07-22 6:15pm vacuum 7.6e-6T. All good at 300A pyro at 1420degC. Ramping up container to 400A , 1A/10s.

2021-07-22 6:36pm vacuum 8e-6T. All good at 400A pyro at 1700degC. Ramping up container to 500A , 1A/10s.

2021-07-22 6:57pm vacuum 1e-5T. All good at 500A pyro at 1960degC. Ramping up container to 553A , 1A/10s.

2021-07-22 7:13pm vacuum 1e-5T. All good at 553A pyro at 2100degC.

2021-07-22 7:36pm Ramping down 1A/10s.

2021-07-23 10:00am Venting.

 Wednesday, September 08, 2021, 12:36

297 C discs were loaded onto a Ta tube wrapped in 3 Ta heatshields. (10 of which are analysis discs).  They should be the first to be pushed out as they were loaded last.

The discs were loaded upside down to facilitate transfer to final container post conditioning.

a Ta foil disc was placed at the front end and a Ta spring at the back end of the tube.

The weight of the whole system is 254.4 g

Evap 2 was left to reduce pressure overnight.

Target temperature is 2000 C for five hours @ approx 450A

Good vacuum = 3e-2 Torr

Bad vacumm= 5e-2 Torr

 Thursday, September 09, 2021, 08:46IGP1= 7.5 e-07 Torr

Will manually ramp up TGHT to 80 A 

Thursday, September 09, 2021, 09:09 

pressure began to rise at 50A so will leave at 50 A waiting for stabilization.

Current began to shoot up to rapidly, lowered current to 40A.  

Thursday, September 09, 2021, 10:34

At IGP1= 1.3e-4 Torr manually increasing current again 

Thursday, September 09, 2021, 12:52 

IGP1= 8.6e-5 and dropping

TGHT = 60A, 0.87 V

Will begin autoramp to 120A at 1A/min

Thursday, September 09, 2021, 14:06

IGP1= 3.2e-05Torr

TGH T= 120A, 1.9V

Set autoramp to 1A/10s to 200A 

Thursday, September 09, 2021, 14:57

IGP1=  1.5e-05 Torr

TGHT = 200A, 3.4V

Set Autoram to 2A/10s to 450A

OMEGA = 1249 C

 At 258A OMEGA = 1420 C

continue ramp up at 2A/10s to 450

projected 2000 C is 454 A

Thursday, September 09, 2021, 16:10 

Tapped up to 470 A and OMEGA 1993C.  Will leave at this current because T may rise.  

Thursday, September 09, 2021, 21:21

OMEGA 2011 C

IGP1 = 6.9e-06 Torr

Ramping down @ -1 A/min

Thursday, September 09, 2021, 17:27

Temperature kept around 2000 C by reducing current.  It was reduced to 455A and Temperature stabilized .  Time of ramp down will be  21:10 

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.