Friday, March 05, 2021, 10:47

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

Initial weight including heat-shields = 431.0 g

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

Evap 2 will be pumped down over night.

Good vacuum = 3.00 e-5 Torr

Bad vacuum = 5.00 e-5 Torr

 Saturday, March 06, 2021, 10:29

IGP1= 2.7 e-07 Torr and stable

AutoRamp at 1A/min to 40 A on TGHT and TBHT

Saturday, March 06, 2021, 22:36

IGP1= 2.2e-07 Torr

TGHT = 40.3 A, .46V

TBHT = 38.48 A, .48 V  (set to 40 A)

Start Autoramp at 0.5A/min to 400 A on TGHT and 230A on TBHT

Sunday, March 07, 2021, 07:48

IGP1=8.5e-7 Torr

TGHT = 287 A, 4.6V

TBHT = 232 A, 4.0 V

OMEGA = 1493C

 Increase ramp speed on TGHT to 2A/min to 400A

Sunday, March 07, 2021, 08:36 

 IGP1=1.7 e-06 Torr

TGHT = 373.7 A, 6.3V

TBHT = 232.9 A, 4.1 V

OMEGA = 1752 C

Sunday, March 07, 2021, 08:53

 IGP1= 1.7e-06 Torr

TGHT = 400 A, 6.8 V

TBHT = 232.8 A, 4.1 V

OMEGA= 1842

Ramp TGHT @ 2A/min to 420 A as per attached current approximation

Sunday, March 07, 2021, 09:25

OMEGA=1915 C

TGHT = 420A, 7.2V

TBHT= 232.8 A, 4.1V

IGP1= 1.6 e-06 Torr

Tap down manually to approx 1900 C

TGHT = 412.9 A, 7.0 V and OMEGA=1900 C

Will leave for about 4 hours at this temperature

Sunday, March 07, 2021, 13:05

IGP1= 1.1 e-06 Torr

TGHT = 415 A, 7.2 V

TBHT = 232.8 A, 4.1 V

OMEGA = 1880C

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

 Monday, November 01, 2021, 07:37

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

Note* on the leading end of the assembly I placed tantalum foil heatshield similar to what I previously observed there.  I believe it may impact temperature at the entrance of the container tube. 

Desired temperature = 1800 C (expected TGHT ~430 A), TBHT will be set fixed at 230A (max).

Evap 2 was pumped down over the weekend

Good vacuum = 3.00 e-03Torr

Bad vacuum = 5.00 e-02 Torr

Monday, November 01, 2021, 07:39

Starting autoramp at 1 A/min to 40 A on both TGHT and TBHT 

IGP1= 3.5 e-07 Torr

Monday, November 01, 2021, 09:08

 IGP1= 1.6 e-06 Torr

TGHT = 40A, 0.99 V

TBHT = 39A, 1,2 V

Start autoramp @ 1A/min for both TGHT and TBHT to 400A and 230A respectively.

Monday, November 01, 2021, 14:33

OMEGA= 1545 C

TGHT =  354 A, 6.0 V

TBHT = 233 A, 4.8 V

IGP1= 1.7 e-05 Torr

increase ramp rate to 2A/min

Monday, November 01, 2021, 14:44 

OMEGA= 1585C

TGHT =  367A, 6.3 V

TBHT = 233 A, 4.8 V

IGP1= 1.7 e-05 Torr

Monday, November 01, 2021, 14:49

OMEGA= 1604 C

TGHT =  377A, 6.5V

TBHT = 233 A, 4.8 V

IGP1= 2.1 e-05 Torr 

Monday, November 01, 2021, 14:53 

OMEGA= 1624C

TGHT =  384 A, 6.6V

TBHT = 233 A, 4.8 V

Monday, November 01, 2021, 15:00

OMEGA= 1660C

TGHT =  400 A, 6.8V

TBHT = 233 A, 4.8 V

IGP1= 2.4 e-05 Torr 

Monday, November 01, 2021, 15:17

Initiate autoramp to 430A on TGHT @2A/min

Monday, November 01, 2021, 16:34 

 OMEGA = 1750 C

TGHT = 430 A, 7.3 V

Better heat insulation than before.  Next time need to place a Ta heatshield at the other end on the copper assembly.  Will raise T to 435 A and keep until 1930  hours.

Monday, November 01, 2021, 20:23

IGP1= 1.6 e-05 Torr

Omega = 1760 C

TGHT= 436 A, 7.4 V

TBHT = 232 A, 4.8 V

* Note: kept a approx 1 hour extra hoping that pressure would drop further

Started ramp down at -2A/min for TGHT and -1A/min for TBHT

Coating looks reasonably good.  

 Nb#9 LP-SIS target description:

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

Foil Thickness = 0.025mm

Target density =  7.24 g/cm3

Target length = 3.5 cm

Total Mass = 25.343 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  425 g (w/ end caps)

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

End caps installed (not yet expanded). No Ta foil heat shield added.

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Wednesday, October 21, 2020, 14:09: Roughing. 

Wednesday, October 21, 2020, 14:32: Turbo pump on. 

Wednesday, October 21, 2020, 15:29: Waterlines opened. Vacuum ok @ 1.05E-05T. 

Wednesday, October 21, 2020, 15:30: TGHT / TBHT PS on. Slope Set.

Wednesday, October 21, 2020, 19:06: Auto-ramping TGHT / TBHT to 300 / 100 @ 1 A per min. Vacuum @ 1.85e-06T.

Thursday, October 22, 2020, 07:26: Auto-ramping TGHT / TBHT to 500 / 200 @ 2 A per min. Vacuum @ 7.61e-07T.

Thursday, October 22, 2020, 11:28: Auto-ramping TGHT / TBHT to 580 / 230 @ 2 A per min. Vacuum @ 1.53e-06T. The Omega IR2C is back. Temp @ 1576 deg C.

Thursday, October 22, 2020, 12:22: Auto-ramping TGHT to 625 A @ 2 A per min. Vacuum @ 2.47e-06T. Temp @ 1734 C.  

Thursday, October 22, 2020, 12:48: Auto-ramping TGHT to 645 A @ 2 A per min. Vacuum @ 3.11e-06T. Temp @ 1815 C.   

Thursday, October 22, 2020, 13:10: Auto-ramping TGHT to 660 A @ 2 A per min. Vacuum @ 3.39e-06T. Temp @ 1851 C.  

Thursday, October 22, 2020, 13:25: Manually tap up TGHT until 1900 C. Vacuum @ 3.53e-06T.

Thursday, October 22, 2020, 13:30: TGHT @ 673 A. Temp @ 1903 C. Vacuum @  3.79e-06T.

Thursday, October 22, 2020, 14:00: Auto-cooling @ 1 A per min. 

Friday, October 23, 2020, 07:50: PS off. Turbo pump off. Purge waterline. 

Friday, October 23, 2020, 09:02: Venting. 

Ta#61 LP-SIS target description:

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

Foil Thickness = 0.025mm

Target density =  12.76 g/cm3

Target length = 3.4 cm

Total Mass = 43.388 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  464 g (w/ end caps)

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

End caps installed (not yet expanded). No Ta foil heat shield added 

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, October 06, 2020, 14:17: Roughing.

Tuesday, October 06, 2020, 14:36: Turbo pump on.

Tuesday, October 06, 2020, 14:43: Turbo pump not spinning up. Holding at 4 krpm. Will need to vent and Troubleshoot in the am.  

Attempted to run the turbo pump again. Only runs to 4 krpm. Shut down to avoid trip. Vent & remove Flex-line HS. Change all the SS gaskets. Re-install Flex-line HS w/ Ta#61.

Wednesday, October 07, 2020, 09:16: Roughing. 

Wednesday, October 07, 2020, 09:32: Turbo pump on. 

Wednesday, October 07, 2020, 10:05: Multiple attempts made to spin up the turbo pump. TP1 holds at 4 krpm, occasionally to 5 krpm, times out & trips. 

Wednesday, October 07, 2020, 10:08: Shut off TP1 & backing pump. 

Replaced TP1. https://elog.triumf.ca/TIS/Evaporator_2/514

Wednesday, October 07, 2020, 13:45: TP1 off. Soft start function off. Remote start configuration initiated. TP1 on @ 38krpm. OK. 

Wednesday, October 07, 2020, 13:47: Vacuum @ 1.31e-05T.

Wednesday, October 07, 2020, 13:49: Waterlines opened. Vacuum ok @ 1.27e-05T.

Wednesday, October 07, 2020, 13:50: PS switched on. 

Wednesday, October 07, 2020, 15:24: Slope set @ 0.98. Vacuum @ 3.30e-06T.

Wednesday, October 07, 2020, 15:26: TGHT / TBHT on. Manually tap up to 10 / 10 A.

Wednesday, October 07, 2020, 15:28: Auto-ramping TGHT / TBHT to 300 / 150 A @ 2 / 1 A per min. 

Thursday, October 08, 2020, 05:23: Vacuum @ 7.00e-07T. 

Thursday, October 08, 2020, 05:25: Auto-ramping TGHT / TBHT to 450 / 200 A @ 2 / 1 A per min. Temp @ 996 C

Thursday, October 08, 2020, 06:44: Auto-ramping TGHT / TBHT to 550 / 230 A @ 2 / 1 A per min. Temp @ 1426 C

Thursday, October 08, 2020, 07:43: Vacuum @ 3.88e-06T. Temp @ 1685 C. 

Thursday, October 08, 2020, 07:45: Auto-ramping TGHT to 600 A @ 2 A per min.

Thursday, October 08, 2020, 08:42: Auto-ramping TGHT to 630 A @ 2 A per min. Vacuum @ 4.01e-06T. Temp @ 1800 C. 

Thursday, October 08, 2020, 09:07: Auto-ramping TGHT to 645 A @ 2 A per min. Vacuum @ 4.91e-06T. Temp @ 1851 C.  

Thursday, October 08, 2020, 09:19: Auto-ramping TGHT to 655 A @ 2 A per min. Vacuum @ 5.37e-06T. Temp @ 1879 C.   

Thursday, October 08, 2020, 09:28: TGHT @ 650-657 A. Vacuum @ 5.70e-06T. Temp @ 1901 C. Desired temperature reached*

Thursday, October 08, 2020, 09:59: TGHT @ 650-657 A. Vacuum @ 4.64e-06T. Temp @ 1903 C.

Thursday, October 08, 2020, 10:01:  Auto-cooling TGHT / TBHT @ -3 / -2 A per min. 

Thursday, October 08, 2020, 13:57: TP1 / PS off.

Thursday, October 08, 2020, 14:08: Venting. 

Thursday, October 08, 2020, 14:15: Flex-Line HS removed w/ Ta#61. 

 Short oven loaded with additional hardware are spacers into the flex-line HS.

A Ta short tube was wrapped with 3 tantalum foils,

a tantalum cap was inserted in both sides of the Ta tube, the caps weren't sealed.

The tube was set in the EVAP2 

Wednesday, August 12, 2020, 11:48: Electrical check in EVAP 2:

Target to HS @ 563V 

Leg to leg above bracket

TGHT A @ 10A: 1.332 mOhm

TGHT B @ 10A: 1.300 mOhm

Leg to leg w/ bracket

TGHT A @ 10A: 1.490 mOhm

TGHT B @ 10A: 1.491 mOhm

Wednesday, August 12, 2020, 12:08: Roughing.

Wednesday, August 12, 2020, 2:08: Turbo.

Thursday, August 13, 2020, 09:14

 IGP1 = 7.9e-7 Torr

A leak check was performed, no leak detected.

 TGHT power supply on.

Thursday, August 13, 2020, 10:03

IGP1 = 7.7e-7 Torr.

The current was tapped to 50 A 

Autoramp set to 1 A each 10 s to 200 A

Good vaccum 3e-5 Torr

Bad vacuum 5e-5 torr

Thursday, August 13, 2020, 10:47

Autoramp reached 200 A

TGHT =  200.25 A, 2.38 V

IGP1 = 1.58e-6 Torr

 Thursday, August 13, 2020, 11:07

TGHT =  200.25 A, 2.38 V

IGP1 = 9.66e-7 Torr

Target is shinning dimly

Omega reads 1033 +-50 degC

ARIEL pyrometer is installed in the back of the EVA2 to measured the body temperature of the oven

Thursday, August 13, 2020, 15:30

The connection of the pyrometer with the software was not possible to establish and delay the ramp up of the oven

Friday, August 14, 2020, 10:47

Restarting experiment, 

IGP1 =  4.24e-7 Torr

TGHT = 0 A, ) V, (TGHT was ramped down)

Autoramp set to 1 A each 10 s to 200 A

Good vaccum 3e-5 Torr

Bad vacuum 5e-5 torr

Friday, August 14, 2020, 11:48

Target is shinning dimly

Omega reads 1033 +-50 degC

Autoramp set to 1 A each 10 s to 250 A

Autoramp set to 5 A each 60 s to 450 A

Friday, August 14, 2020, 13:51

TGHT = 6.46 V, 450.13 A

IGP1 = 2.32e-6 Torr

Omega = 1931 °C (slope 0.99)

ARIEL pyrometer = 1504.5 °C (slope 0.929)

Friday, August 14, 2020, 14:06

Autoramp = 5A each 2 min until 500 

Autoranp stopped at 475 A (EPICS TGHT = 6.87V, 476.663A)

Omega = 2013 °C

ARIEL pyrometer = 1547 °C

Friday, August 14, 2020, 17:34

Autoramp is set to  5A each 2 min until 500 

TGHT = 7.403 V, 500.006 A, 

omega = 2104 C

AP= 1586 C

Friday, August 14, 2020, 17:49

Autoramp  is set to  5A each 2 min until 550 

Autoramp stopped by itself at 545 A instead of 550 A

TGHT = 8.11V, 547.65A, 

omega = 2214C

AP= 1656.8 C

IGP1=6.8e-6 Torr

Friday, August 14, 2020, 18:13

 Autoramp  is set to  10A each 2 min until 600

Friday, August 14, 2020, 21:42

TGHT = 9.213 V, 597.8 A,

IGP1 3.27e-6 Torr

Omega =  2380 °C

Ramping down at 5 A per min to 475 A

Monday, August 17, 2020, 09:02

TGHT =  6.741 V, 471.6 A,

IGP1 = 3.46e-7 Torr

Omega = 2052 6°C 

Proceeded to ramp down at  5 A per min to 0 A 

 Wednesday, August 26, 2020, 10:26

A Ta short tube was loaded with a C-cartridge

Currently, the tube is under vacuum and it will be heated to 2000 °C during 3 days.

IGP1 = 3.2e-7 Torr

 Wednesday, August 26, 2020, 16:15

IGP1 = 2.5e-7 Torr

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

Autoram set to 200A at 10A/30 s

Wednesday, August 26, 2020, 17:05

TGHT = 3.9 V, 301.3 A

IGP1 = 5.4e-7 torr 

Omega = 1378 °C

AP (slope 0.9) = 1441.8 °C

Wednesday, August 26, 2020, 17:20 

Autoramp set to 550 A at 5A/30s

Wednesday, August 26, 2020, 23:43 

TGHT = 7.561 V, 504.9 A

Omega = 2124 °C

AP = 2010.5 °C

Thursday, August 27, 2020, 07:15

TGHT =  7.461 V, 510.2 A

Omega = 2103 °C

 Thursday, August 27, 2020, 13:41

TGHT = 7.5 V, 510.8 A

Omega = 2099 °C

Friday, August 28, 2020, 09:24

TGHT = 7.4 V, 513.9 A 

Omega = 2103 °C

Friday, August 28, 2020, 13:12

TGHT = 7.46 V, 505.6 A

IGP1 = 2.7e-7 Torr

Omega = 2103 °C

Saturday, August 29, 2020, 14:18

IGP1 = 2.5e-7 Torr

TGHT = 7.5 V, 510.8 A

Omega = 2109 °C 

Saturday, August 29, 2020, 17:44

IGP1 = 2.4e-7 Torr

TGHT = 7.5 V, 505.2 A

Omega = 2119 °C 

Saturday, August 29, 2020, 17:51 

Starting ramp down to 0 A at 5 A/min

Objective: Coating the inner surface of a tantalum tube to make a destructive test and use a reference for the tantalum boats coatings

Results: 

Sunday, March 27, 2021, 11:23

No water leak

IGP1 = 3.7e-7 torr

Sunday, March 27, 2021, 16:10

The wire was heated in the same manner as the last three runs

From 0A to 7A the autoramp was set to 0.5A/min

At 8A the wire started the glow dimmly 

Above 8A, the wire was heated manually at 0.5A until 16A where the step was changed to 1A, 

the temperature was measured with the filament pyrometer every 2 A starting at 10A

At 42 A the step was changed to 0.6A until 42.6A, 4.38V (2020 °C), the wire was kept at that temperature for 90 min

After that time, the current was ramped down at 0.5A/min until ~20A when the current rampping was changed too 1A/min

Objective: Coating the inner surface of a short tantalum boat with rhenium.

Result:

• The wire snnaped around 376 W (53 A, and 7.09 V) and 2170 °C (measured with filament pyrometer)
• The tube does not have indications of coating

Thursday, March 25, 2021, 11:23

Yesterday a heat shield was installed in the EVAP2.

The desired temperature of the Re wire is 2500 degC

A water leak was performed (elog 539 describes it), no leak was detected.

Tuesday, March 23, 2021, 11:01

Pressure 3.8e-7 Torr, current rate set to 6 A @ 0.5 A/min

The wire started glowing at TGHT =  4W, 7A, 0.56V

When reaching 7A the current was increased 0.5 A manually 

When reaching 16 A,  the current was increased 1 A manually until reaching 54 A when the wire snapped

Friday, March 26, 2021, 13:55

Yesterday a heat shield was installed in the EVAP2.

A 1mm thick rhenium wire was held within two copper brackets to pass through a Cu tube with the intention of coating its inside face.

The desired temperature of the Re wire is 2500 degC

A water leak was performed and no leak was detected

 Monday, August 31, 2020, 12:23

A short naked Ta tube (no heat shielding), previously coated with TaC was set under vacuum, 

and it will be kept at 2000 °C for 3 days to later identify the TaC's carbon penetration.

Currently pumping down.

 Tuesday, September 01, 2020, 12:25

IGP1 = 2.0-7 Torr

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

Autoram set to 200A at 10A/30 s

Tuesday, September 01, 2020, 12:36

IGP1 = 5.2e-7 Torr

Autoramp set to 300 A at 5 A/30 s 

Tuesday, September 01, 2020, 14:11

IGP1 = 3.4e-7 Torr 

TGHT = 330.2 A, 4.2 V

Omega = 1234 °C

Tuesday, September 01, 2020, 14:31

IGP1 = 1.76e-6 torr

TGHT = 6.94 V, 510 A

Oemga = 1564 C, 

AP = 1390.2 C

Autoramp set to 600 A at 5 A/30s 

Tuesday, September 01, 2020, 15:33

TGHT power supply = 600 A, 8.74 V

Omega = 1807 C

Autoramp set to 700 A at same rate

 Tuesday, September 01, 2020, 15:33

TGHT power supply = 11.94 V, 765 A

Omega = 2157 °C

Wednesday, September 02, 2020, 10:15 

IGP1 = 1.0e-6 Torr

TGHT = 12.0 V, 772 A

Omega = 2167 °C

Wednesday, September 02, 2020, 13:26

IGP1  = 9.1e-7 Torr

TGHT = 12 V, 769.5 A

Omega = 2166 °C 

Wednesday, September 02, 2020, 16:06

IGP1 = 8e-7 Torr

TGHT = 12 V, 773.3 A

Omega = 2167 °C 

Wednesday, September 02, 2020, 20:53

IGP1 =7.4e-7 Torr

TGHT = 11.8 V, 760.95 A

Omega = 2164 °C 

Thursday, September 03, 2020, 09:54

IGP1 = 5.5e-7 Torr

TGHT = 11.9 V, 774 A

Omega = 2162 °C 

Thursday, September 03, 2020, 11:06

IGP1 = 5.3e-7 Torr

TGHT  = 11.9 V, 758.7A

Omega = 2161 °C

Thursday, September 03, 2020, 14:39

IGP1 = 4.8e-7 Torr 

TGHT = 11.9 V, 771.8 A

Omega = 2164 °C

Friday, September 04, 2020, 09:34

IGP1 = 3.9e-7 Torr

TGHT = 11.9 V, 760.1 A

Omega = 2168 °C 

Friday, September 04, 2020, 13:39

 IGP1 = 3.5e-7 Torr

TGHT = 11.9 V, 758.6 A

Omega = 2170 °C

 Friday, September 04, 2020, 15:55

IGP1 = 3.5e-7 Torr

TGHT = 12 v, 760.6 a

Omega = 2171 °C

 Tuesday, August 18, 2020, 09:06

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,

IGP1 = 3.75e-7 Torr

Autoramp set to TGHT at 0.2 A/min to reach 52 A

Tuesday, August 18, 2020, 13:47

IGP1=  6.8e-7 Torr

TGHT =0 .511 V, 51.3 A

IGP1 = 6.8e-7 Torr

Autoramp set to TGHT at 0.5 A/min to reach 100 A

IGP1 = 3.3e-7 Torr

Autoramp set to TGHT at 0.5 A/min to reach 430 A 

Wednesday, August 19, 2020, 06:57 

Autoramp stopped at 402 A

IGP1 = 1.12e-6 Torr

TGHT = 5.6 V, 403.65 A

Autoramp set to TGHT at 1 A/min to reach 500 A 

Wednesday, August 19, 2020, 08:59

IGp1 = 1.7e-6 Torr

 TGHT = 7.22 V, 500.34 A

After 30 min at 1900 °C, autoramp set to TGHT at -1 A/min to reach 450 A, the ramp will be stopped when the temperature reads 1850 °C

Autoramp stopped at 1845 °C

IGP1 = 1.17e-6 Torr

TGHT = 6.8 V, 472.95 A 

 Sunday, August 30, 2020, 06:47

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

a Ta cap was inserted to the end of the tube to be able to measure the temperature during heating

Desired temperature= 1900 C,

Omega Slope set = 0.990

Sunday, August 30, 2020, 06:48

IGP1 = 3.9e-7 Torr

Autoramp set to 0.5A/min to 400 A 

Sunday, August 30, 2020, 18:27

IGP1 8.41e-7 Torr

TGHT = 4.2 V, 327.15 A

Omega  = 1367 °C 

Sunday, August 30, 2020, 18:49

IGP1 = 9.6e-7 Torr

TGHT = 4.4 V, 337.1 a

Omega = 1402 °C 

Sunday, August 30, 2020, 19:25

IGP1 = 9.5e-7 Torr

TGHT = 4.6 A, 347.5 A

Omega = 1472 °C 

Autoramp set to 450 A at 0.1A/30s

Sunday, August 30, 2020, 19:59

IGP1 = 8.5e-7 Torr

TGHT = 4.8 V, 360.5 A

Omega = 1510 °C

 Sunday, August 30, 2020, 22:07

IGP1 = 7.2e-7 Torr

TGHT = 5.3 V, 392.6 A

Omega = 1675 °C 

 Sunday, August 30, 2020, 22:16

IGP1 = 7.1e-7 Torr

TGHT = 5.5 V, 403.2 A

Omega = 1678 °C

Autoramp set to 450 at 0.1A/min

 Sunday, August 30, 2020, 22:26

IGP1 = 6.9e-7 Torr

TGHT = 5.5 V, 399.15 A

Omega = 1689 °C

Monday, August 31, 2020, 08:08

IGP1 = 4.4e-7 Torr

TGHT = 6.4 V, 453.4

Omega =  1852 °C

Monday, August 31, 2020, 08:12 

Autorap set to 0 A at -5 A/min

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

Saturday, August 22, 2020, 11:41

A Ta short tube was coated with TaC and sintered, then it was loaded with a c-cartridge

Now is currently under vacuum and it will be heated to 2000 °C during 3 days

Saturday, August 22, 2020, 11:43

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

IGP1 = 3.08e-7 Torr 

Autoram set to 10A/30 s to 200 A

 Saturday, August 22, 2020, 11:59

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

TGHT = 2.36 V, 200.1 A

IGP1 =2.46e-6 Torr

Autoramp set to to 300 A at 5A/30s 

Saturday, August 22, 2020, 13:03

TGHT = 7.32 V, 495.3 A

IGP1 = 2.7e-6 Torr

Omega = 2016 °C

AP = 1970.1 °C

Autoramp set to 550 A at 5A/30s

 Saturday, August 22, 2020, 13:11

TGHT =7.6 V, 523.2 A

IGP1 = 3.2e-6 Torr

Omega = 2077 °C

Monday, August 24, 2020, 07:59

Voltage increased ~0.2 V while current remained the same indicating an increment in resistance, temperature increment increased accordingly

TGHT = 7.815 V, 520.87 A

Omega = 2126 °C

Monday, August 24, 2020, 08:04

The current was reduced 0.1 A to 519.9

Monday, August 24, 2020, 08:55 Omega =  2112 °C

Monday, August 24, 2020, 09:12

The temperature returned to Omega = 2130 °C

The current was reduced 0.1 A to 519.8

Monday, August 24, 2020, 09:56

TGHT = 7.7 V, 518.3 A

Omega = 2132 °C 

Monday, August 24, 2020, 09:59 

The current was reduced 0.2 A to 519.6 A

TGHT = 7.7 V, 517.3 A

Monday, August 24, 2020, 10:07  Omega = 2130°C

 Monday, August 24, 2020, 10:08

The current was reduced 0.4 A to 519.2 A

TGHT = 7.7 V, 513.5 A

Monday, August 24, 2020, 10:13  Omega = 2129°C

Monday, August 24, 2020, 10:21

Voltage dropped to 7.6 V and temperature reduced to 2105 °C

Monday, August 24, 2020, 10:30

Voltage increased to 7.8 V and temperature increased to 2128 °C

Monday, August 24, 2020, 10:33

The current was reduced 0.4 A to 518.6 A

TGHT = 7.7 V, 513.06 A

Monday, August 24, 2020, 10:38  Omega = 2130 ­°C

Monday, August 24, 2020, 10:41

 The current was reduced 0.4 A to 518.2 A

Monday, August 24, 2020, 11:13 

 The current was reduced 0.4 A to 517.8 A

Monday, August 24, 2020, 11:19  Omega = 2128 °C

Monday, August 24, 2020, 11:19 

 The current was reduced 0.4 A to 517.4 A

Monday, August 24, 2020, 11:22  Omega = 2126

Monday, August 24, 2020, 11:22

 The current was reduced 0.4 A to 517.0 A

Monday, August 24, 2020, 11:25  Omega = 2123 °C

Monday, August 24, 2020, 11:26

 The current was reduced 0.4 A to 516.6 A 

Monday, August 24, 2020, 11:30  Omega = 2109 °C

Monday, August 24, 2020, 11:30 

 The current was reduced 0.4 A to 516.2 A

Monday, August 24, 2020, 11:36  Omega = 2100 °C

Monday, August 24, 2020, 11:37

  The current was reduced 0.4 A to 516.0 A

TGTH = 7.5 V, 512.9 A

Omega = 2095 °C

Monday, August 24, 2020, 14:17

Voltage dropped and later on increased 

TGHT = 7.7 V, 517.5 A

Omega = 2120 °C 

Monday, August 24, 2020, 14:18

 The current was reduced 0.4 A to 515.6 A

TGHT = 7.6 V, 509.4 A

Monday, August 24, 2020, 14:20  Omega = 2125 °C

Monday, August 24, 2020, 14:20

The current was reduced 0.4 A to 515.2 A

Monday, August 24, 2020, 14:22  Omega = 2122 °C

Monday, August 24, 2020, 14:22

 The current was reduced 0.4 A to 514.8 A

Monday, August 24, 2020, 14:29  Omega = 2116 °C

Monday, August 24, 2020, 15:27

The voltage dropped as well as the temperature

TGHT = 7.5 V, 512.5 A 

Monday, August 24, 2020, 15:28 Omega = 2095 °C

Monday, August 24, 2020, 22:06

TGHT = 7.6 V, 515.9 A 

Omega = 2105 °C

Tuesday, August 25, 2020, 09:07

TGHT = 7.6 V, 519.13 A

Omega = 2102 °C 

Tuesday, August 25, 2020, 13:02

TGHT = 7.6 V, 518.0 A

Omega = 2116 °C

IGP1 = 3e-7 Torr

Tuesday, August 25, 2020, 13:04 

Starting ramp down to 0 A at 5 A/min 

 Thursday, September 17, 2020, 16:10

An LP-SIS was wrapped with 3 Ta layers, and installed in the EVAP2

Desired temperature= 1900 C, Omega Slope = 0.990

Friday, September 18, 2020, 10:56

IGP1 = 4.4e-7 Torr 

Leak check performed, no leak observed

Friday, September 18, 2020, 11:16

Power supplies on.

Good vac at 3.00e -5 Torr

Bad vac at 5.00e-5 Torr

Autoramp at 0.5A/min to 400A on TGHT and 230A on TBHT

 Friday, September 18, 2020, 11:21

Autoramp paused because, TBHT is not ramping

Ramping manually current to 10 A in 0.5 A steps

Friday, September 18, 2020, 11:38

Restarted autoramp  (Autoramp at 0.5A/min to 400A on TGHT and 230A on TBHT)

Friday, September 18, 2020, 22:50

IGP1 = 2.04e-6 Torr 

TGHT = 5 V, 322.8 A

TBHT = 4 V, 233.1 A

Omega = 1459 °C

Autoramp changed to 0.2 A/min to 450 A

Saturday, September 19, 2020, 10:49

IGP1 = 8e-7 Torr

TGHT = 7.3 V, 449.1 A

TBHT = 4 V, 233.1 A

Omega = 1789 degC

 Saturday, September 19, 2020, 13:25

IGP1 = 6.5 e-7 Torr

TGHT  7.2 V, 447.975 A

TBHT = 4.08 V, 233.09 A

Omega = 1785 °C

Saturday, September 19, 2020, 13:26

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

Monday, September 21, 2020, 09:16

Turning off pumps 

Monday, September 21, 2020, 16:47

EVAP2 was vented with air and the tantalum oven was removed, the coating seems sintered. 

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, September 21, 2020, 16:50

450 graphite foils coated with graphite slurry were loaded in a tantalum tube, the tantalum tube was wrapped with 3 Ta heat shields and installed in the EVAP, to measure the temperature, a pack of 4 Ta foils were inserted in each side of the tube.

System is currently pumping down. 

 Tuesday, September 22, 2020, 07:54

IGP1 = 2e-6 Torr

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

The autoramp is set to 50 A at 1 A each 10 s 

Tuesday, September 22, 2020, 08:18 

IGP1 = 3.7e-6 Torr

TGHT = .586 V, 50.06 A

Autoramp is set to 80 A same conditions.

 Tuesday, September 22, 2020, 08:26

IGP1 = 0.0006 Torr

TGHT = .97 V 80.3 A

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

Tuesday, September 22, 2020, 08:45

IGP1 = 0.003 Torr 

TGHT = 1.3 V, 100.5 A

Autoramp is set to 120 A at same conditions 

Tuesday, September 22, 2020, 09:36

IGP1 = 0.0001 torr

TGHT = 1.6 v, 122 A

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

Tuesday, September 22, 2020, 10:19

IGP1 = 5.4e-5 Torr

TGHT = 2.9 V, 200.5 A

Omega = 1123 °C

AP = 1164 °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, September 22, 2020, 11:24

TGHT = 447.8 A, 7.4 V

IGP1 =  3.7e-5 Torr

Omega = 1750 °C

AP = 1720.4 °C

Autoramp set to 520 A at same conditions

 Tuesday, September 22, 2020, 11:38

TGHT = 8.9 V, 525.8 A

IGP1 = 4.8e-5 Torr

Omega = 1914 °C

AP = 1835.6 °C

Autoramp set to 560 A at same conditions

Tuesday, September 22, 2020, 12:13

Omega 2038 °C 

Tuesday, September 22, 2020, 12:14

Current manually reduced to 555 A 

TGHT = 9.8 V, 560.8 A

IGP1 = 2.5e-5 Torr

Tuesday, September 22, 2020, 12:17 

Omega = 2030 °C

Tuesday, September 22, 2020, 12:19 

Current manually reduced to 550 A 

TGHT = 9.8 V, 547.8 A

IGP1 = 2.3e-5 Torr

Tuesday, September 22, 2020, 12:27 

Omega = 2027 °C

Tuesday, September 22, 2020, 12:27

Current manually reduced to 540 A 

TGHT = 9.6 V, 541.6 A

IGP1 = 2e-5 Torr

Tuesday, September 22, 2020, 12:34

Voltage suddenly increased!

TGHT = 10.3 V, 533.8 A

IGP1 = 2.9e-5 Torr

Omega = 2129 °C

Current reduced manually to 520 A to compensate the voltage increment 

Tuesday, September 22, 2020, 12:52

Another voltage increment 

TGHT = 9.9 V, 519.75 A

IGP1 = 1.9 e-5 Torr

Omega 2108 °C

Current reduced manually to 500 A to compensate the voltage increment 

Omega = 2070 °C

Tuesday, September 22, 2020, 13:05 

TGHT = 9.4 V, 492.4 A

Omega = 2063 °C

Tuesday, September 22, 2020, 13:08

Another voltage increment! this time it was an spike 

Tuesday, September 22, 2020, 16:13

After 5 hours

IGP1 = 6e-6 Torr

TGHT = 9.5 V, 488 A

Autoramp was set to 0 A at 2 A/min 

Omega = 2044 °C

AP = 2003.7 °C

Wednesday, September 23, 2020, 16:18

EVAP2 vented with air, target removed. 

 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 

 2021-03-30 7:48 Target loaded with parasitic target only. No container. Leaving under vacuum over night.

 2021-03-31 13:43 Leak check performed. Water on. Need to vent system, electric connection disconnected.

 2021-03-31 15:02 First test successfully finished. Venting to introduce container with radiating heating gun.

 2021-04-01 14:58 Vacuum 3.5E-7 torr. Leak check done. Ramping up target heater to 100A at 1A/10s

 2021-04-01 14:58 Vacuum 5E-7, 100A all ok. Temp foil 24.3DegC. ramping to 500A at 1A/10s.

 2021-04-01 14:58 Temp of foil not increasing much. Probably issue with TC. ramping down at 1A/10s to vent and inspect.

 2021-04-02 11:03 Target reinstalled, foil TC reinstalled. Vacuum 3E-7 torr. Leak check done. Ramping up container to 500A 1A/10s. 

 2021-04-02 13:07 Still isues with TC. Container ramped down at 1A/10s. Venting, brought heat gun to check TC.

 2021-04-02 15:10 TC connection fixed, origin of issues. Vacuum down to 3E-5 torr. Ramping up container to 200A 1A/10s.

 2021-04-02 18:32 TGTH 200A Tc temp 327.5degC. ramping up to 300A. 1A/10s.

 2021-04-02 18:32 TGTH 300A Tc temp 500degC. ramping up to 400A. 1A/10s.

 2021-04-02 19:17 TGTH 400A Tc temp 618degC. ramping down.

 2021-04-03 13:37 Foil was changed, ramped up to 200A at 1A/10s, Temp TC 360degC. Ramping to 300A. Vac 8.6E-6 torr.

 2021-04-03 13:59 300A Temp TC 580degC. Ramping to 500A, 1A/10s. Vac 7.6E-6 torr.

 2021-04-03 14:36 500A Temp TC 836degC. Ramping to 600A, 1A/10s. Vac 9E-6 torr.

 2021-04-03 14:36 600A Temp TC 960degC. Vac 1.1E-5 torr. Ramping down. 

2021-04-03 19:00 After venting an opening the evap2, it was found that remaining from a past heat treatment where on the Tantalum container. The sublimation of the material coated the inner walls of the evap.2. Now cleaned.

 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)