Thursday, October 17, 2019, 12:00

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 IGP1= 7.0 e-07 Torr

Thursday, October 17, 2019, 13:53

After pressure stabilization at 40A:

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

 Friday, October 18, 2019, 6:20

TGHT = 400A, 6.52V, TBHT= 233A, 4.1V

OMEGA = 1733C

Start autoramp to 430A on TGHT at 1A/min

Friday, October 18, 2019, 7:05

TGHT= 431A, 7.1V

TBHT= 233A, 4.1V

IGP1= 1.13e-06 Torr

OMEGA = 1828 C

Set autoramp to 465 at 1A/min

Friday, October 18, 2019, 11:13

TGHT = 465A, 7.8V, TBHT = 233A, 4.1V

OMEGA = 1865C

(Something is different with the heat dissipation on this target.  Will leave at this current and start cooling at 1200 noon to avoid container strain)

 Friday, October 18, 2019, 12:00

TGHT = 462.7A, 7.8V

TBHT= 233.4A, 4.1V

OMEGA = 1863C

IPG1= 1.02e-06 Torr

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

 Monday, October 21, 2019, 09:11

Pump down and dismount.

Tuesday, October 08, 2019, 14:14: Remove Flex line HS. 

HS: 42752-1

Waterlines not open yet.

Tuesday, October 08, 2019, 14:15: roughing.

Tuesday, October 08, 2019, 14:24: Turbo pump on. 

Tuesday, October 08, 2019, 14:32: TP @ speed. 

Wednesday, October 09, 2019, 13:24 

The initial pressure was 3.25e-7 Torr

The current was manually increased to 25 A on both TBHT and TGHT  at a rate of 1 A each 30 s for both heaters.

Wednesday, October 09, 2019, 13:33

At 1 pm an additional ram was made to TGHT 350 A and TBHT 200 at same rate.

Friday, October 04, 2019, 11:37

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 3 coated springs, one in between endcaps and two on either end

The boat is wrapped with 2-layers of Ta heatshields.

Chamber pumping down

OMEGA slope = 0.99

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

Final desired temperature on OMEGA (tap)= 1800C

Monday, October 07, 2019, 09:08

Sunday night heating started at 1A/ min on TGHT to 54 A

heating paused for 1 hour to allow IGP1 to equillibrate.  Then restarted at 1A/min to 400A as planned. 

This morning IGP1 = 1.3e-06 Torr

TGHT = 401A, 4.2V

OMEGA = 1550 C

Monday, October 07, 2019, 09:36

manually tapping to 1800 C

Monday, October 07, 2019, 14:09

Temperature @ ~1800 for 3.5 hours

TGHT= 495.4, 9.2 V

IGP1= 1.1e-06 Torr Pressure Steady there begin cooling

Cooling @ -2A/min

Thursday, October 03, 2019, 08:58

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

Initial weight including heat-shields = 427 g

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

Evap 2 was pumped down previous night.

IGP1= 7.81e-07 Torr

Manually tapping up to ~40A on both TGHT and TBHT at ~1A/min

Good vacuum = 3.00 e-5 Torr

Bad vacuum = 5.00 e-5 Torr

Thursday, October 03, 2019, 09:21

Manually tapped to 50A on TGHT and TBHT

Will allow pressure to stabilize and begin autoramp TGHT and TBHT at 1A/min to 400A and 230A respectively.

autoramp increments might be increased to 2A/min depending on stability of system.

Thursday, October 03, 2019, 10:00

TGHT = 51.6A, 0.36V

TBHT = 49.5A, 0.62V

IGP1=9.6e-7 Torr

Starting autoramp at 1A/min to a max of 400A for TGHT and 230A for TBHT.  Will monitor and increase ramp increments to 2A/min if stable.

Thursday, October 03, 2019, 11:09

TGHT = 103A, TBHT=97A

IGP1=9.1e-06 Torr and dropping

Will increase autoramp increments to 2A/min

Thursday, October 03, 2019, 11:41

With TGHT = 148A, 1.9V and TBHT = 141A, 2.3V

IGP1= 7.9e-6 Torr

Autoramp was increased to 3A/min

Thursday, October 03, 2019, 13:45

TGHT=401A, 6.9V

TBHT=233A, 4.2V

IGP1= 1.14e-05Torr

OMEGA = 1874

begin manual ramp to 1900C

(Temperature dropping as pressure drops)

 Thursday, October 03, 2019, 14:11

 TGHT= 416A, 7.1V

TBHT=233A, 4.2V

OMEGA = 1900 C

IGP1= 6.9e-06 Torr and trending down

Thursday, October 03, 2019, 15:24

TGHT manually bumped to 421A,  7.2 V because temperature dropped slightly.

Thursday, October 03, 2019, 19:00

TGHT manually increased to 425A, 7.3V

Thursday, October 03, 2019, 19:12

TGHT = 424.9A, 7.3V

TBHT=233.2A, 4.1V

OMEGA= 1897 C

IGPA=1.45e-06 Torr

Starting ramp-down at -1A/min on TGHT and 0.5A/min on TBHT

Friday, October 04, 2019, 11:34

Container taken out.

Wednesday, September 25, 2019, 18:06

Target boat with a layer of niobium foil on the bottom is used to heat up Nb samples to 1400 C for 4 hrs.

The niobium samples are wrapped in a Nb foil.

Boat is wrapped with 2 layers of Ta foil, careful to avoid touching samples.

Thursday, September 26, 2019, 18:10 

The target assembly was exchange to a clean one e-log 459 and the Nb arrangement was loaded into evap2.

Friday, September 27, 2019, 18:13

HS water valves opened, no leaks detected.

Tapped up manually to 40 A.

IGP1 = 9.54e-7 Torr

Setting auto-ramp rate at 0.2 A/min to max setpoint of 100 A.

Vacuum stable.

Setting auto-ramp at 1 A/min to 300 A lead to ~1200 C.

Autoramping at 1 A/min to 400 A will stop at 1400 C.

Temperature reading is 1400 C at:

TGHT = 5.61 V, 345.656 A

The temperature reading went to 1408 C on Omega and 1417 C on Micron so the current was dropped to 342.537 A and 5.56 V

The temperature went to 1418 C on Omega and the current was dropped to 339.281 A

After 4 hours at 1400 C, the Nb was cooled down

The final pressure was 3.07e-7 Torr 

The EVAP2 was vented with air and the Nb was removed. 

 HS# 42752-7

Thursday, September 26, 2019, 13:46: Remove Flexible lines HS

Thursday, September 26, 2019, 14:03: Assy installed.

Friday, September 27, 2019, 07:07: Vacuum @ 1.16e-06T. 

Friday, September 27, 2019, 07:09: Waterlines opened. Vacuum stable @ 1.15e-06T 

Monday, September 30, 2019, 10:04: Remove Nb target & assy. Install flexible line HS. 

Swapped out VCRs on HS to tray connection. (Right one felt slightly off)

Tuesday, September 17, 2019, 13:23: roughing.

Tuesday, September 17, 2019, 13:32: Turbo pump on. 

Tuesday, September 17, 2019, 13:44: waterlines re-opened. No vacuum response. Ok. @ 7.90e-05T & dropping. 

Wednesday, September 18, 2019, 08:05: Vacuum ok @ 6.87e-07T. Turbo pump off. 

Wednesday, September 18, 2019, 08:21: Venting. 

Pumped down again easy for Ta#59. Issue resolved.

 Ta#59 LP-SIS target description:

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

Foil Thickness = 0.025mm

Target density =  13.74 g/cm3

Target length = 3.4 cm

Total Mass =  46.7314 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  436 g (440 g w/ end caps)

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

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

Monday, September 16, 2019, 14:47: Roughing. 

Monday, September 16, 2019, 14:55: Turbo pump on. 

Monday, September 16, 2019, 15:04: Timed out. Open RV1

Monday, September 16, 2019, 15:05: Restart Turbo pump.

Monday, September 16, 2019, 15:14: Attempt stop / restart before timeout. 

Monday, September 16, 2019, 15:21: Turbo pump unable to pass 4krpm. Close for re-attempt tomorrow am.

Tuesday, September 17, 2019, 12:33: Venting. Sort out pump down issues.

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

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Wednesday, September 18, 2019, 08:50: Omega slope set to 0.98. Power supplies / sources on. vacuum@ 3.34e-05T & dropping. 

Wednesday, September 18, 2019, 08:25: Roughing.

Wednesday, September 18, 2019, 08:34: Turbo pump on. 

Wednesday, September 18, 2019, 10:22: TGHT manually to 40A. Vacuum @ 3.18e-06T.

Wednesday, September 18, 2019, 10:25: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 350 / 180 A. 

Wednesday, September 18, 2019, 13:43: Vacuum @ 2.30e-06T. Temp @ 1120 deg C. TGHT / TBHT @ 350 / 180 A. 

Wednesday, September 18, 2019, 13:45: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 550 / 215 A.  

Thursday, September 19, 2019, 06:39: Vacuum @ 8.79e-07T. Temp @ 1722 deg C. TGHT / TBHT @ 550 / 215 A.  

Thursday, September 19, 2019, 06:42: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 600 / 230 A.   

Thursday, September 19, 2019, 08:18: Auto-ramping TGHT to 630A @ 2 A per min

Step up to desired temp

Thursday, September 19, 2019, 08:49: Vacuum @ 3.22e-06T. TGHT / TBHT 645 (642.7) / 230 (233.44) A. TGHT Voltage= 12.501V. Omega: 1902-1903 deg C. Desired temperature = 1900C reached. 

Thursday, September 19, 2019, 14:17: Vacuum @ 1.45e-06T. Begin auto-cooling TGHT / TBHT @ -1 / -1 A per min. 

Friday, September 20, 2019, 07:59: Turbo pump off. PS / Sources off. 

Friday, September 20, 2019, 08:42: Venting. 

 Wednesday, September 11, 2019, 15:12

A target container coated with TaC elog 455 was loaded with an empty graphite cartridge and set it in the EVAP2

The system is currently pumping down.

The target container was wrapped with 3 new Ta heat shields.

The target container will be heated to 2000 C and the temperature will be held for 4 hours.

 The autoramp was set to:

TGHT 1 A/min, 450 A

TBHT 0.5 A/min, to 230 A

At 500 A on the TGHT, 20 additional amps were programmed to increased at 1 A/min, however, the autoramp increased the current to 520 A without stepping (see figure A). 

The final conditions were:

TGHT: 9.95 V, 565.59 A

TBHT: 4.18 V, 233.43 A

IGP1: 2.2 e-6 Torr

Friday, September 13, 2019, 11:16

After 4 hours the EVAP2 was cooled down

at a rate of TGHT 1 A/min and TBHT 0.5 A/min

The EVAP2 was vented with air.

Friday, September 06, 2019, 11:20

Container was coated with Tac and wrapped with 2 Ta heat shields.

Desired temp=1900 C, Omega slope set =0.990

Chamber pumped down over night and will be initially tapped manually to 40A for both TGHT and TBHT.

Subsequently, current will be automatically ramped up in increments of 1A/min to reach 400A for TGHT and 230A for TBHT.

Then TGHT will be manually tapped to target temperature and allow to stabilize for a minimum of 3 hours.

Good vac at 3.0e-5 Torr

Bad vac at 5.0e-5 Torr

Friday, September 06, 2019, 11:32

IEVAP2:IGP1=9.6e-7 Torr

Tapping to 40A (TGHT and TBHT).

Friday, September 06, 2019, 12:54

Start autoramp

1A/min TGHT and TBHT

IGP1=4.0e-06 Torr

Friday, September 06, 2019, 13:29

TGHT = 70A, TBHT=70A, pressure started to spike rapidly so aborted autoramp and lowered the current to 66A for both TGHT and TBHT.

pressure continued to rise so tapped current to 60A.  A drop observed.  Will allow to stabilize.

Friday, September 06, 2019, 14:06

IGP1=5.3e-06 Torr.  Restart previous ramping. 

At 66A paused ramping.  IPG1= 1.0e-5 Torr

Friday, September 06, 2019, 15:44

IGP1=6.0e-6 Torr

Start modified autoramping: 0.4A/min for TGHT and TBHT.  Will manually tap up in the morning, over ham and eggs. 

Saturday, September 07, 2019, 10:52

 Will tap up to 423 A on TGHT as per attachment #1 regression

IGP1= 1.13e-6 Torr

OMEGA = 1802 C

TGHT= 401.0 A, 6.84V

TBHT=233.6A, 4.1V

Saturday, September 07, 2019, 11:06

Tapped up TGHT to 438A

OMEGA= 1903C

Will monitor and adjust if necessary.

Saturday, September 07, 2019, 15:06

IGP1 =  1.17e-6 Torr

TGHT = 7.46 V, 439.3 A

TBHT = 4.13 V, 233.4 A

Autoramps

TGHT = -2 A/min, TBHT = -1 A/min

Monday, September 09, 2019, 16:34

The EVAP2 was vented and the target container was removed. 

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.

Tuesday, July 30, 2019, 15:33

ZrC backup Target 12.6 cm disc length, 465 g total weight (no springs and no analysis discs).

Total weight= 470 g.

20 Analysis discs weighing 2.368 g (10 at each end).

Two springs (one at each end).

OMEGA slope initially = 0.990  (was changed to 1.09 at higher Temperature as per eLog #434

Target is being pumped down.

Wednesday, July 31, 2019, 09:31

Desired temp = 1900 C, Auto ramping TGHT at  0.1 A/min to reach 400A then  TGHT will be tapped up accordingly to reach desired temperature. (eLog 434)

TBHT will be set fixed at 230A (max). TBHT at 0.1 A/min to reach 230A.

Note: Initially both TGHT and TBHT will be ramped up at 0.3A/min up to 30A each.

IGP1= 1.35e-06 Torr

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Wednesday, July 31, 2019, 12:02

At 30A pressure was increasing a bit fast, therefore, the ramp was changed to increments of .1A every 120s (.05A/min). 

Thursday, August 01, 2019, 08:42

TGHT = 54.7

TBHT = 54.3

IGP1 = 3.86e-5 Torr

Will changer heat ramp to .1A/min by changing wait interval to 60s

Tuesday, August 06, 2019, 07:14

OMEGA = 1212 C

TGHT = 344.7 A, 5.79 V

TBHT = 233 A, 4.17 V

IGP1 = 1.05 e-06 Torr

Autoramping to 400A at increments of 0.1A/min

Tuesday, August 06, 2019, 09:50

OMEGA = 1233 C

TGHT = 360 A, 6.05 V

TBHT = 233 A, 4.18 V

IGP1 = 1.21 e-06 Torr

increasing autoramp increments to .5A/min

Tuesday, August 06, 2019, 12:27

OMEGA = 1356 C

TGHT = 400.6 A, 6.92 V

TBHT = 233.8 A, 4.20 V

IGP1 = 1.95 e-06 Torr

Autoramping to 430 A on TGHT at 0.5 A/min

Tuesday, August 06, 2019, 14:02

OMEGA = 1447 C

TGHT= 430.9 A, 7.66V

TBHT = 233.2A, 4.2 V

IGP1= 2.01e-06 Torr

Autoramping to 440 A on TGHT at 0.5 A/min

Wednesday, August 07, 2019, 09:10

OMEGA = 1548

TGHT = 441.56 A, 8.2 V

TBHT = 233.3 A, 4.2 V

IGP1 = 6.21e-07 Torr

Manually ramping up to 1900C @ 1A/min

Wednesday, August 07, 2019, 09:43

Changed OMEGA slope to 1.09 as per eLog #434

OMEGA reads 1773 C @ TGHT 451A, 8.4V

IGP1 = 7.02 e-07

Wednesday, August 07, 2019, 10:56

OMEGA = 1903 C

TGHT = 483.5 A, 9.2V

TBHT = 233.3 A, 4.3V

IGP1 = 1.7 e-06 Torr trending down

Wednesday, August 07, 2019, 11:40

OMEGA = 1914 C

TGHT = 483.5 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.5 e-06 Torr trending down

Decrease TGHT current to 480.4 A

Wednesday, August 07, 2019, 13:04

OMEGA = 1918 C

TGHT = 480.3 A, 9.4V

TBHT = 233.3 A, 4.3V

IGP1 = 1.28e-06 Torr

Decrease TGHT current to 474.5 A

Wednesday, August 07, 2019, 13:26

OMEGA = 1904 C

TGHT = 474.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.11e-06 Torr

Wednesday, August 07, 2019, 13:47

OMEGA = 1912 C

TGHT = 474.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.10e-06 Torr

Decrease TGHT to 471.8 A

OMEGA temperature went down to 1904 C

Wednesday, August 07, 2019, 14:26

OMEGA = 1911 C

TGHT = 471.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.00e-06 Torr

Decrease TGHT to 469.0 A

OMEGA temperature down to 1904C

Wednesday, August 07, 2019, 15:45

OMEGA = 1912 C

TGHT = 468.8.8 A, 9.2V

TBHT = 233.3 A, 4.3V

IGP1 = 9.2e-07 Torr

Decrease TGHT to 466.0 A

OMEGA temperature down to 1903C

Wednesday, August 07, 2019, 22:09

OMEGA = 1924 C

TGHT = 466.8. A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 7.6e-07 Torr

Cooling at 2A/min TGHT to 456.0 A, 9.0 V and 1A/min TBHT to 230.1 A, 4.2 V

OMEGA = 1900 C

Will allow Pressure to stabilize

 Thursday, August 08, 2019, 06:54

OMEGA = 1919 C

TGHT = 456.9 A, 9.1V

TBHT = 230.3 A, 4.2 V

IGP1 =5.7e-07 Torr

Cooling at 2A/min TGHT and 1A/min TBHT

Thursday, August 08, 2019, 13:30

Target removed from Evap2.  Awaiting inspection by John.

Darwin Ortiz Rosales wrote:

Tuesday, July 30, 2019, 15:33 ZrC backup Target 12.6 cm disc length, 465 g total weight (no springs and no analysis discs). Total weight= 470 g. 20 Analysis discs weighing 2.368 g (10 at each end). Two springs (one at each end). OMEGA slope initially = 0.990  (was changed to 1.09 at higher Temperature as per eLog #434 Target is being pumped down. Wednesday, July 31, 2019, 09:31 Desired temp = 1900 C, Auto ramping TGHT at  0.1 A/min to reach 400A then  TGHT will be tapped up accordingly to reach desired temperature. (eLog 434) TBHT will be set fixed at 230A (max). TBHT at 0.1 A/min to reach 230A. Note: Initially both TGHT and TBHT will be ramped up at 0.3A/min up to 30A each. IGP1= 1.35e-06 Torr Good vac at 3.00-5 Torr Bad vac at 5.0e-5 Torr. Wednesday, July 31, 2019, 12:02 At 30A pressure was increasing a bit fast, therefore, the ramp was changed to increments of .1A every 120s (.05A/min).  Thursday, August 01, 2019, 08:42 TGHT = 54.7 TBHT = 54.3 IGP1 = 3.86e-5 Torr Will changer heat ramp to .1A/min by changing wait interval to 60s Tuesday, August 06, 2019, 07:14 OMEGA = 1212 C TGHT = 344.7 A, 5.79 V TBHT = 233 A, 4.17 V IGP1 = 1.05 e-06 Torr Autoramping to 400A at increments of 0.1A/min Tuesday, August 06, 2019, 09:50 OMEGA = 1233 C TGHT = 360 A, 6.05 V TBHT = 233 A, 4.18 V IGP1 = 1.21 e-06 Torr increasing autoramp increments to .5A/min Tuesday, August 06, 2019, 12:27 OMEGA = 1356 C TGHT = 400.6 A, 6.92 V TBHT = 233.8 A, 4.20 V IGP1 = 1.95 e-06 Torr Autoramping to 430 A on TGHT at 0.5 A/min Tuesday, August 06, 2019, 14:02 OMEGA = 1447 C TGHT= 430.9 A, 7.66V TBHT = 233.2A, 4.2 V IGP1= 2.01e-06 Torr Autoramping to 440 A on TGHT at 0.5 A/min Wednesday, August 07, 2019, 09:10 OMEGA = 1548 TGHT = 441.56 A, 8.2 V TBHT = 233.3 A, 4.2 V IGP1 = 6.21e-07 Torr Manually ramping up to 1900C @ 1A/min Wednesday, August 07, 2019, 09:43 Changed OMEGA slope to 1.09 as per eLog #434 OMEGA reads 1773 C @ TGHT 451A, 8.4V IGP1 = 7.02 e-07 Wednesday, August 07, 2019, 10:56 OMEGA = 1903 C TGHT = 483.5 A, 9.2V TBHT = 233.3 A, 4.3V IGP1 = 1.7 e-06 Torr trending down Wednesday, August 07, 2019, 11:40 OMEGA = 1914 C TGHT = 483.5 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.5 e-06 Torr trending down Decrease TGHT current to 480.4 A Wednesday, August 07, 2019, 13:04 OMEGA = 1918 C TGHT = 480.3 A, 9.4V TBHT = 233.3 A, 4.3V IGP1 = 1.28e-06 Torr Decrease TGHT current to 474.5 A Wednesday, August 07, 2019, 13:26 OMEGA = 1904 C TGHT = 474.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.11e-06 Torr Wednesday, August 07, 2019, 13:47 OMEGA = 1912 C TGHT = 474.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.10e-06 Torr Decrease TGHT to 471.8 A OMEGA temperature went down to 1904 C Wednesday, August 07, 2019, 14:26 OMEGA = 1911 C TGHT = 471.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.00e-06 Torr Decrease TGHT to 469.0 A OMEGA temperature down to 1904C Wednesday, August 07, 2019, 15:45 OMEGA = 1912 C TGHT = 468.8.8 A, 9.2V TBHT = 233.3 A, 4.3V IGP1 = 9.2e-07 Torr Decrease TGHT to 466.0 A OMEGA temperature down to 1903C   Wednesday, August 07, 2019, 22:09 OMEGA = 1924 C TGHT = 466.8. A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 7.6e-07 Torr Cooling at 2A/min TGHT to 456.0 A, 9.0 V and 1A/min TBHT to 230.1 A, 4.2 V OMEGA = 1900 C Will allow Pressure to stabilize    Thursday, August 08, 2019, 06:54 OMEGA = 1919 C TGHT = 456.9 A, 9.1V TBHT = 230.3 A, 4.2 V IGP1 =5.7e-07 Torr Cooling at 2A/min TGHT and 1A/min TBHT Thursday, August 08, 2019, 13:30 Target removed from Evap2.  Awaiting inspection by John.

 Monday, August 12, 2019, 15:45

Visual inspection on the target was performed today.  See attachment for details.

Target container is slightly bent, and some visible crystallization on the container surface.  

The discs are nicely packed with only a slight expansion in length was measured.

No clogging inside the container nor the ionizer tube. 

Some sintered discs samples were collected and SEM will be perform later. 

 Wednesday, July 17, 2019, 10:57

Annealing of five RRR Nb samples following cold-working and resistance measurements.  Used to validate computational annealing model developed for SRF studies.  For more information contact Norman Muller, x6398.

Desired temperature 1025 C.

Five Nb samples wrapped with Nb foil were set on a tantalum boat (coated with TaC)

the tantalum boat was wrapped with two tantalum sheets.

The boat was installed in the EVAP2.

The initial vacuum was IGP1 = 1.26e-6 Torr.

Ramping rate 5 A/min to final current of 200 A.

Wednesday, July 17, 2019, 11:18 

At 155 A, the ramping rate was changed to 1 A/min 

Wednesday, July 17, 2019, 11:28 

The ramping was stopped at 167 A.

 Wednesday, July 17, 2019, 11:57

Conditions:

IGP1 = 1.65e-6 Torr

TGHT = 2.54 V, 174.46 A

Temperature ~ 950 C

Wednesday, July 17, 2019, 18:07

IGP1 = 1.16 e-6

TGHT = 3.18 V, 206.7 A

Temperature ~950 C

Cooling ramp 10 A/min 

 Vented with air

Suggestion for future annealing:

  Use tantalum boat without TaC coating.

Monday, June 24, 2019, 08:24

Total number of foils: 484

Total mass in  including container = 1495 grams

Total length packed 17.28 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate outgassing

Two TaC coated Ta wire springs inserted at either end.

Initially will heat via autoramp to OMEGA 1400 C , ramping TGHT at  0.1 A/min to reach 530A A (Omega slope set = 0.990)

Then temperature= (Correction to 1800C) 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 700A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max).  TBHT at 0.1 A/min.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

System was pumped down on Friday June 24th, 2019.

IGP1= 3.3 e-07 Torr

(EPICS was down this morning and came back up around 930 a.m.)

Will proceed to manually tap up TGHT and TBHT to 40A as soon as EPICS stability confirmed

Mondayy, June 24, 2019, 15:30

TBHT = 39 A, 0.4V

TGHT=40 A, 0.1V

IGP1= 4.3 e-06 Torr and trending down

Autoramp increments to 0.1 A/min , to 400A on TGHT and 230A on TBHT

Tuesday, June 25, 2019, 08:40

Current has only increased to 53 A and pressure limit reached.  Lowered current back to 51 A on TGHT and TBHT.  Waiting for pressure to stabilize.

Tuesday, June 25, 2019, 12:16

TGHT 51.3 A, 0.39 V

TBHT 51.1 A, 0.58 V

IGP1 = 1.91 e-05 Torr

Starting autoramp with  increments to 0.1 A/min , to 400A on TGHT and 230A on TBHT

 Saturday, June 29, 2019, 22:45

Autoramp increments for TGHT set to 0.2 A/min

 IGP1=2.4 e-06 Torr

 Sunday, June 30, 2019, 07:46

Autoramp incrementsTGHT set to 0.1 A/min to prevent pressure spike. 

IGP1= 1.5 e-05 Torr

 Sunday, June 30, 2019, 08:26

Set autoramp increments on TGHT back to 0.2 A/min

Sunday, June 30, 2019, 15:47

Set autoramp max on TGHT to 500 A

Sunday, June 30, 2019, 21:15

OMEGA = 1240C

TGHT= 465A, 7.0V

TBHT = 233A, 3.2V

IGP1= 1.6 e-05 Torr

Set autoramp max on TGHT to 600A

Monday, July 01, 2019, 09:48

OMEGA = 1605 C

TGHT = 599A, 9.7V

TBHT = 233A, 3.2V

IGP1= 1.3 e-06 Torr

Set autoramp max on TGHT to 650A

Monday, July 01, 2019, 18:21

OMEGA = 1630 C

TGHT = 650 A, 10.6V

TBHT = 233A, 3.2V

IGP1 = 9.7 e-07 Torr

Set utoramp max on TGHT to 700A

Monday, July 01, 2019, 22:07

OMEGA = 1663 C

TGHT = 682A, 11.4V

TBHT = 233A, 3.2V

IGP1= 1.5 e-06 Torr

Set autoramp max on TGHT to 730A

Tuesday, July 02, 2019, 08:15

OMEGA =1700 C

TGHT = 730A, 12.0V

TBHT = 233A, 3.2V

IGP1= 1.1 e-06 Torr

Set autoramp max on TGHT to 750A and increments to 0.4A/min

Tuesday, July 02, 2019, 09:49

Temperature on OMEGA began dropping.  Changed OMEGA slope to 1.09 (Elog 371) and temperature reading = 1884 C.  Aborted autoramp and lowered TGHT current to 740A.

Tuesday, July 02, 2019, 12:14

Temperature and pressure have dropped at a consistent rate. 

IGP1= 9.6 e-07 Torr

OMEGA = 1715 C

Will tap up manually to 750A on TGHT

No appreciable increase in pressure will tap back down to 745A on TGHT

Tuesday, July 02, 2019, 13:11

OMEGA = 1675 C

TGHT = 745A, 12.4V

TBHT = 233A, 3.2V

IGP1 = 1.03 e-06Torr

 Will start to ramp- down TGHT @ -2.0A/min

OMEGA = 1354 C

TGHT = 495A, 7.01V

TBHT = 233.2A, 3.2V

IGP1= 2.2 e-07 Torr

Continue ramp-down TGHT @ -2.0A/min

Tuesday, July 02, 2019, 17:14

TGHT = 285.5A, 3.4V

TBHT = 232A, 3.1V

IGP1= 1.4 e-07 Torr

Start TBHT ramp-down at -1.0 A/min

Wednesday, July 03, 2019, 08:37

Turned off TGHT and TBHT

IGP1 = 7.8 e-08 Torr

Wednesday, July 03, 2019, 13:18

Final total weight of Target = 1489.5 g

Removed 18 discs after weighing.

Monday, June 17, 2019, 17:04

A LP-SIS target container  was wrapped with 3 heat shielding layers,

and an empty graphite insert of 17.4 g was introduce in it.

The system was loaded in the EVAP2 and the chamber is currently being evacuated.

The container will be heated to 2000 C in order to correlate the temperature, current and voltage,

as well as to condition the container.

 Tuesday, June 18, 2019, 07:28

The TGHT and TBHT current will be tapped to 40 A manually

Autoramp will be set to TGHT 1A/min to 500 A

and TBHT 0.5A/min to 230 A.

Tuesday, June 18, 2019, 20:51

After 2 hours at ~1800 C the container was cooled,

IGP1 = 1.2e-6 Torr

TGHT = 7.16 V, 447.094 A

TBHT = 4.19 V, 233.43 A

Temperature 1793 C

 Auto ramp TGHT = -2 A/min, TBHT = -1A/min 

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.

Tuesday, June 04, 2019, 08:36

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, 2 on each side of the stack of endcaps.

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

Chamber pumped down overnight.

OMEGA slope = 0.99

IGP1 = 3.5e-7 Torr

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

Final desired temperature on OMEGA (tap)= 1800C

Tuesday, June 04, 2019, 11:54

IGP1= 6.1e-06 Torr

TGHT= 40 A

Begin autoramp to 400A at 1A/min

Out-gassing cycles observed.  Reduced autoramp to 0.5A/min

Currently TGHT=65A, 0.60 V

Wednesday, June 05, 2019, 08:27

TGHT = 321A, 4.9V @1149C

IGP1= 8.49 e-6 Torr

Set autoramp to 1A/min to530 A

Wednesday, June 05, 2019, 13:26

TGHT 530A, 9.2V

IGP1= 3.01e-05 Torr

OMEGA Temperature = 1689 Celsius

Set autoramp to 570A at 1A/min

 Wednesday, June 05, 2019, 15:51

Tapped manually to 1800 Celsius

TGHT 579A, 10.1V

IGP1= 2.06e-05 Torr

TGHT tapped down to 575A when OMEGA T ~1810 C

Thursday, June 06, 2019, 08:13

TGHT = 575A, 9.95V

OMEGA = 1809 C

IGP1 = 4.1e-7 Torr

Initiating auto-cool at -2.0A/min

Thursday, June 06, 2019, 16:00

After 1 hour  of TGHT at 0A and 0V, unloaded the Target boat.

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 

 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

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