Wednesday, March 13, 2019, 15:41

An uncoated tantalum tube was loaded with a graphite insert (with conical caps).

3 tantalum foils were wrapped around the tantalum tube and a Ta cap was added.

EVAP2 is currently pumping down

The tube will be hated for 5 days at 2000 C

Thursday, March 14, 2019, 10:07

IGP1 = 5.37e-7 Torr

The TGHT will be tapped manually to 50 A  

After aprox 1 hour IGP1 = 5.08e-7 Torr, TGHT=46.5 A, 0.224 V

Autoramp is set to 1A/min to 300 A

 Autoramp is set to 1A/min to 450 A

Autoramp was stopped at 425 A when 2000 C were achieved

 Sunday, March 17, 2019, 00:25

IGP1 = 2.03e-7 Torr

TGHT=424.2 A, 7.117 V, temp 1976 C

Sunday, March 17, 2019, 15:04 

IGP1 = 21.6e-7 Torr

TGHT=424.1 A, 7.085 V, temp 1967 C

cooling down -1 A/min

Monday, April 01, 2019, 16:35

Container was coated with TaC and a roll of graphite inserted inside the tube.   A couple of TaC coated Ta springs inside to keep graphite pressed against walls of cylinder.

Container wrapped with 2 Ta heat shields.

Desired temp = 1900 C, Omega slope set = 0.990, Auto ramping TGHT at 1A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Chamber is currently being pumped down.  Sintering will proceed tomorrow.

Tuesday, April 02, 2019, 06:27

IGP1 = 4.37e-7 Torr

Current is manually tapped to 40 A

Tuesday, April 02, 2019, 08:12 

Pressure increased to IGP1 = 1.15e-5 Torr

and it stabilized to IGP1 = 2.32e-6 Torr after ~1.5 hrs

Autoramp is set to 1 A/min to 400 A

Tuesday, April 02, 2019, 08:45

Autoramp stopped momentarily, to stop current reduction

When pressure reduced to ~4e-5Torr, current was tapped manually to 50 A

Autoramp is set again, the conditions are

IGP1 = 2.5e-5 Torr

TGHT = 58.87 A, 0.36 V

Tuesday, April 02, 2019, 09:31

Autoramp stopped momentarily, to avoid current reduction

When pressure reduced, autoramp is set again,

the conditions are:

IGP1 = 2.9e-5 Torr, TGHT = 0.52 V, 71.5 A 

 Tuesday, April 02, 2019, 15:32

 Autoramp stopped momentarily, to avoid current reduction

conditions: IGP1=4.99e-5 Torr, TGHT = 0.78 V, 85.9 A

When pressure reduced, autoramp is set again,

 Tuesday, April 02, 2019, 22:37

Camera conexion was lost

Autoramp reached 400 A

the current was manually raise to 425 A to allow the completation of the process

Wednesday, April 03, 2019, 00:27

Camera connection still off

The current was reduced to 410 A to match with the estimated temperature 

Wednesday, April 03, 2019, 06:56

Camera connection is back, temperature reading is 1786 C

IGP1  5.01e- Torr

TGHT = 6.93 V, 412.22 A

Autoramp was set to -1A/min to 0A

Wednesday, April 03, 2019, 11:01

IGP1 = 1.67e-7 Torr

TGHT = 2.25 V, 179.53 A

Autoramp changed to -2 A/min 

Wednesday, April 03, 2019, 16:54

The tube was removed from the EVAP2,

The coating has a different color than regular coatings, but it doe not seem like the graphite adhered as expected. 

 Wednesday, April 03, 2019, 16:57

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

Desired temp = 1900 C (expected TGHT ~445A/7.5V).

EVAP2 currently pumping down.

 Thursday, April 04, 2019, 05:12

IGP1 = 4.5e-7 Torr

The current is tapped manually to 40 A

After1 hour IGP1 = 1.18e-6 Torr, the autoramp was set to 1 A/min to 400 A

Thursday, April 04, 2019, 18:58

After 4 hours at ~1900 C:

IGP1 = 6.13e-7 Torr 

TGHT = 6.74 V, 416.06 A

 Sunday, April 07, 2019, 08:10

A graphite insert (with conical caps) was loaded in tantalum tube previously coated with TaC,

and wrapped with 3 tantalum foils,

a tanalum cap was inserted in one side of the Ta tube and sealed.

The tube was set in the EVAP2 and the furnace was pumped down.

IGP1 = 1.24e-7 Torr.

The current was tapped to 40 A

Autoramp was set to 1 A/min to 300 A.

At TGHT 335.53 S, 5.28 V the temperature was 1560

The autoramp was set to 450 A.

At TGHT 474.75 S, 7.96 V the temperature was 1560

The autoramp was set to 450 A.

To reach 2000 C, TGHT = 500.25 A, 8.45 V.

After 1hr the temperature stabilized to 1959 C

and the  current was increased to TGHT = 510.28 A, 8.64 V.

After stabilization the temperature reached 2010 C.

The current was decreased to TGHT = 503.15 A, 8.45 V

and the temperature stabilized to 2001 C.

The voltage increased  unexpectedly to 8.89 V and the temperature increased to 2055,

the current was reduced to keep the tube at 2000 C.

The voltage kept increasing and we kept decreasing the current to keep the tube at 2000

The final current before venting and getting out the container was

TGHT = 466.219 A and 8.467 V.

Test result: Broken tantalum tube.

 Tuesday, April 16, 2019, 13:38: Replaced the bottom insert on the heat shield. 

Used small amount of isopropyl alcohol to wipe the inside if the HS out. 

 Friday, May 10, 2019, 16:54

A tantalum tube was coated with TaC,and wrapped with three tantalum sheets,

the tube was set in the EVAP2 to sinter the TaC coating.

EVAP2 is currently pumping down. 

 Sunday, May 12, 2019, 18:40

IGP1 = 3.01e-7 Torr

Manually tapped current TGHT to 40 A

IGP1 = 4.89e-Torr

at the IGP1 = 1.961e-6 Torr the autoramp was set to 1 A/min to 380 A

IGP1 = 6.91e-7 Torr

TGHT = 6.133 V, 386.8 A, temperature 1682  C

IGP1 = 7.77e-7

TGHT=6.36V, 399A 1730 C

After 4 hours at 1895 C TGHT = 7.435 V and 445.781 A

TGHT was set -2 A/min to 0 A

The EVAP2 was vented with air and the tube was removed

 Tuesday, May 21, 2019, 14:33: Install flexible line evap 2 HS.

 Tuesday, May 21, 2019, 17:57

A tantalum tube previously coated with TaC and sintered was loaded with graphite foils.

The mass of the foils was 20.04 g.

The system will be heated to 2000 C to find out the corresponding current.

After that the tantalum tube will be trasferred to the EVAP1

and it will be heated there for 5 days. 

EVAP2 currently pumping down

 Thursday, May 23, 2019, 05:48

IGP1 = 2.516e-7 Torr

Manually tap to 50 A

Autoramp set to 1 A/min to 400 A

Thursday, May 23, 2019, 13:09 

IGP1 = 3.78e-6 Torr

TGHT = 6.4 V, 401.3 A

Temperature reading = 1629

Thursday, May 23, 2019, 13:09

Autoramp was set to 550 A at 1 A/min 

Stopped at 530 A

Thursday, May 23, 2019, 21:27

IGP1 = 6.77e-7 Torr

TGHT = 9.2175 V, 507.375 A

After 6 hours at ~2000 C the autoramp was set to -2 A/min to 0 A 

Friday, May 24, 2019, 8:46

EVAP2 was vented with air and the tantalum tube was removed, examined and transferred to EVAP1

Friday, May 24, 2019, 15:26

 A graphite insert with tantalum wires in its caps

was loaded in a tantalum tube, the system will be heated to 2000 C

and after 6 hrs at that temperature, it will be cooled and heated to 2000 C again.

The temperature will be hold at 2000 C for a 6 days.

Currently the chamber is being evacuated.

 Saturday, May 25, 2019, 06:01

IGP1 = 2.2e-7 Torr

Manually tapping to 50 A

Autoramp set to 1 A/min to 400 A

Saturday, May 25, 2019, 13:37

The autoramp was set to 450 A

Then it was manually tappe to 475 A 

Thursday, June 6, 2019, 16:43

A graphite insert with tantalum wires in its caps was loaded in a tantalum tube.

The system will be heated to 2000 C again (see elog 446)

Currently the chamber is being evacuated.

Friday, June 7, 2019, 16:40

Autoramp was set to 450 A at 1A/min to reach 2000 C

The temperature will be hold at 2000 C for a 4 days.

Tuesday, June 11, 2019, 16:46 

Autoramp is set to -2 A/min to 0 A

Wednesday, June 12, 2019, 17:01 

The tube present sever crystallization but is not broken and has some resistance against pressure.

Wednesday, August 28, 2019, 06:00

A graphite insert (with conical caps) was loaded in tantalum tube 

the Ta tube was wrapped with 3 tantalum foils,

a tantalum cap was inserted in one side of the Ta tube and sealed.

The tube was set in the EVAP2 and the furnace was pumped down.

IGP1 = 1.23e-6 Torr.

The current was tapped to 50 A

Autoramp was set to 1 A/min to 400 A.

 Wednesday, August 28, 2019, 12:02

Autoramp reached 400 A

TGHT = 6.57 V, 404.4 A, IGP1=4.7e-6 Torr

Autoramp was set to 450 A at 1A/min

 Wednesday, August 28, 2019, 12:48

Autoramp reached 450 A

TGHT =7.526 V, 450.188 A, IGP1=5.88e-6 Torr

Autoramp was set to 500 A at 1A/min

Wednesday, August 28, 2019, 13:40

Autoramp reached 500 A, temperature 1880 C

TGHT =8.79 V, 501.094A, IGP1=7.48-6 Torr

Autoramp was set to 540 A at 1A/min 

Wednesday, August 28, 2019, 14:03

The autoramp was stopped at 520 A, because according to previous tests that current is enough to have 2000 C,

the temperature read was 1930 C

TGHT =9.23 V, 520.7 A, IGP1=7.8-6 Torr

Wednesday, August 28, 2019, 15:20

The autoramp was set to 540 A at 1A/min

When the ramp stopped the conditions were:

TGHT=9.59 V, 539.5 A, IGP1= 6.08e-6 Torr

Temperature= 1988 C

Manually tapped to 545 A the temperature reached 2000 C

Wednesday, August 28, 2019, 17:08 

To keep the temperature at 2000 or less the current was decreased,

TGHT= 8.91 V, 445.125 A, IGP1=9.93e-7 Torr

Max temperature read: 2001 C

Min temperature read: 1996 C

Tuesday, September 03, 2019, 11:15

The tube was stable at 1950-1960 C during the weekend but today at around 6 am it had a drop in the current indicating mechanical failure 

The autoramp was set to -2A/min to 0 A. 

The tube will be examined and in case that it is not broken it will be set in the EVAP1 to continue heating it.

Monday, September 09, 2019, 16:35  

The tube became brittle and broke.

 Leak noted on previous TaC sintering on HP FEBIAD # 42464-3.

Swapped out gaskets on HS flex line a re-tightened.

Monday, November 25, 2019, 11:31: Roughing.

Monday, November 25, 2019, 11:42: Turbo pump on. 

Monday, November 25, 2019, 13:38: Vacuum @ 7.29e-06T. 

Monday, November 25, 2019, 13:42: Waterlines opened. Vacuum slowly climbed to 7.57e-06T. Waterlines closed / purged. 

Monday, November 25, 2019, 13:47: Vacuum @ 6.83e-06T.

Monday, November 25, 2019, 13:50: Waterlines opened. Vacuum gradually climbed again. Waterlines closed / purged.

Monday, November 25, 2019, 13:51: Turbo pump off. 

Monday, November 25, 2019, 14:41: Vent. Check seals (All on HS line).

Monday, November 25, 2019, 14:48: Roughing. 

Monday, November 25, 2019, 15:06: Vacuum @ 1.22e-04T. Waterlines opened. Vacuum continued to pump down steadily to 8.86e-05T and dropping.

Monday, November 25, 2019, 15:07: Turbo pump off. 

 The TGHT PS was found to be defective.

It was uninstalled w/ Joel S: I2020-02-28-2. 

It was replaced with the conditioning station PS & connected. The chiller is not required and has been unplugged. 

Wednesday, March 04, 2020, 14:00. Controls Involved (PS still locked out via main breaker)

Wednesday, March 04, 2020, 14:31: Water supplies opened. All ok except Chiller (Disconnected from PS, but not the supply/return, do not open Chiller lines) 

Controls work ongoing.

Thursday, March 05, 2020 (Darwin)

Gelo finished installation of the other power supply S:_____________________.

It was tested and proved to be operational and epics controlled.  Tested up to 60A

Chiller interlock was removed as it is no longer needed.

Will wait for Aaron to swap FEBIAD assembly in EVAP 2.

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.  

 Wednesday, May 27, 2020, 10:22

IGP1 = 3.2e-7 Torr

TGHT = 0.186 V, 0.028 A

The autoramp is set to 50A:

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

Wednesday, May 27, 2020, 10:40

 TGHT = 1.17 V, 50.9 A

PS = 1.21 V, 50 A

IGP1 = 8e-4 Torr and going down

Autoramp is set to 80 A same conditions

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

Wednesday, May 27, 2020, 12:29

TGHT = 1.59 V, 80.04 A

PS = 1.58 V, 80 A

IGP1 =  2e-4 Torr and going down

Autoramp is set to 100 A,conditions:

1 A each 20 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr 

Wednesday, May 27, 2020, 12:38

TGHT = 1.97 V, 100.35 A

IGP1 = 4e-4 Torr

Autoramp is set to 120 A,conditions:

1 A each 20 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr 

 Wednesday, May 27, 2020, 12:48

TGHT = 2.27 V, 119.1 A

IGP1 = 4e-4 Torr

Autoramp is set to 190 A,conditions:

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

Wednesday, May 27, 2020, 13:03

TGHT = 3.4 V, 191.25 A

IGP1 = 3e-4 Torr

Autoramp is set to 190 A,conditions:

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

Wednesday, May 27, 2020, 13:36 

TGHT = 7.8 V, 423 A

IGP1 = 3e-4 Torr

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 

Wednesday, May 27, 2020, 13:43

TGHT = 8.5 V, 451.6 A

IGP1 = 2e-4 Torr

Autoramp is set to 520 A,conditions:

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

Wednesday, May 27, 2020, 14:02 

TGHT = 10.3 V, 508.16 A

Power supply = 10.39 V, 506 A

Omega = 2000 degC

AP = 2046.4 degC

After 3 hours at 2000 degC, the autoramp was set to 0 A,

conditions: -2 A each 10 s.

Note: There was a voltage drop of 0.6 V (fig. elog-484-fig2)

 Darwin reported that he was unable to achieve vacuum of 150mTorr. The flex-line HS had been removed last week for modifications. SS gaskets received today. Replaced HS gaskets (Cu). 

Monday, July 13, 2020, 11:00: Roughing. 

Monday, July 13, 2020, 11:44: Vacuum to 200mTorr. Venting.

Monday, July 13, 2020, 11:55: Roughing. HS waterlines were opened. No visible leak detected.

Monday, July 13, 2020, 12:32: Venting. Vacuum to 175mTorr.

Monday, July 13, 2020, 12:34: Roughing.  

Monday, July 13, 2020, 15:21: Turn off the roughing pump. Vent in the am & plan to remove the HS to leak check the HS & EVAP 2. 

Tuesday, July 14, 2020, 07:42: Venting. 

Tuesday, July 14, 2020, 08:23: Flexible line HS removed. U-Line installed. Roughing. 

Tuesday, July 14, 2020, 08:54: Turbo pump on. 

Tuesday, July 14, 2020, 11:15: Vacuum @ 3.14e-06T. Turbo & Roughing pump off. 

Tuesday, July 14, 2020, 11:25:

HS leak checks:

0.0e-08 atm-cc/sec 

0.0e-07 atm-cc/sec @ 75 PSI He w/ sniffer.

0.0e-07 atm-cc/sec @ 120 PSI He w/ sniffer. (Note HS is very dirty inside)

Tuesday, July 14, 2020, 11:35: Venting EVAP 2. He bottle connected on "Air-In" on the HS water supply line. 

Tuesday, July 14, 2020, 13:50:

Pressurized the HS lines on EVAP 2 w/ 30 PSI He for 10 minutes. Remained @ 0.0e-07 atm-cc/sec.

Tuesday, July 14, 2020, 13:53: Roughing.

Tuesday, July 14, 2020, 17:33: Turbo pump on. 

Wednesday, July 15, 2020, 10:31: Turbo pump off. 

Wednesday, July 15, 2020, 12:02: HS Leak checked in the cold lab: 0.0e-07 atm-cc/sec @ 120 PSI He w/ sniffer.

Wednesday, July 15, 2020, 12:34: Venting. 

Wednesday, July 15, 2020, 13:37: Installed flex-line HS. Pressurized the HS lines on EVAP 2 w/ 30 PSI He for 10 minutes. Remained @ 0.0e-07 atm-cc/sec.

Wednesday, July 15, 2020, 13:42: Roughing. 

Wednesday, July 15, 2020, 14:16: Turbo pump on. 

Wednesday, July 15, 2020, 15:59: Vacuum @ 3.85e-06T 

Wednesday, July 15, 2020, 16:00: Waterline opened. No immediate response on Vacuum. 

Wednesday, July 15, 2020, 16:03: Vacuum @ 3.69e-06T and continuing to drop. 

Friday, July 24, 2020, 15:00

Ta tube cotaining 497 ZrC discs 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.

Saturday, July 25, 2020, 08:57

IGP1= 8.7 e-07 Torr

Start ramp at 0.25 A/min to 20 A on TGHT 

Saturday, July 25, 2020, 10:07

IGP1= 2.7e -06 Torr

Set ramp target to 30 A 

Wednesday, July 29, 2020, 13:11 

OMEGA reading 1700 C at 430 A during the night.  It was kept at this temperature for 3.5 hours.  The OMEGA slope was not changed from 0.990

when IGP1 = 1.2 e-06 Torr and stable, cooling was started at -3A/min at 9 am on this day.

IGP1= 2.2 e-07 Torr now at time of dismounting

 BP1 swapped with RP2 (TS beamline)

U-line installed.

Wednesday, August 05, 2020, 13:37: Roughing. 

Wednesday, August 05, 2020, 13:39: Open RV1 to EVAP 2 chamber.

Wednesday, August 05, 2020, 14:08: Turbo pump on. 

Wednesday, August 05, 2020, 14:17: Turbo pump on (green) / Shut - off. 

Wednesday, August 05, 2020, 14:18: BP1 off. Runs ok. 

Flex line HS installed. New SS gaskets. 

Wednesday, August 12, 2020, 08:56: Roughing (Check).

Wednesday, August 12, 2020, 09:17: Ready for turbo pump.

Wednesday, August 12, 2020, 09:20: BP1 Off. Venting. 

Thursday, August 19, 2020, 17:28

 A short tantalum tube was coated with TaC and wrapped with 3 layers of Ta,

a Ta foil was attached to the end of the tube to be able to measure the temperature during heating

Desired temperature= 1900 C,

Omega Slope set = 0.990,

Thursday, August 20, 2020, 17:29

IGP1 = 4.25 e-7 Torr

Autoramp set to 0.5A/min to 400 A 

 Thursday, August 20, 2020, 20:36

IGP1 = 6.78e-7 Torr

TGHT = 267.7 A, 3.28 V

Autoramp set to 0.4 A/min to 450 A

Friday, August 21, 2020, 10:28

 IGP1=7.23e-7 torr

TGHT = 6.3 v, 446.3 A

Omega = 1603 °C

Autoramp set to -5 A/min