Tuesday, June 27, 2022, early afternoon: We assembled the setup in evap2 and started the pumps leaving it running over night.

Tuesday, June 28, 2022, 09:31 Turbo pump stopped for unknown reasons a few hours after we left. Restarting the pump.

Tuesday, June 28, 2022, 10:23 Vacuum down to 1e-5T start to ramp up TGHT 1A/10s to 200A.

Tuesday, June 28, 2022, 1:20 pm, Ramped from 0-500A. thermocouple reading 900C while pyrometer reads 1600C. begin ramping down to 0A.

 11am: Setting up new target tube thermocouple test

Thursday, August 04, 2022, 09:31 Test finished August 3rd afternoon. Venting now.  

1st test polarity 1

10:12 am Begin pumping down to rough vacuum
12:50 pm begin ramping up towards 2000C. Ta tube only, welded thermocouple mount
3:08 Ta tube reached 2000C, began ramping down. The ramping up process was smooth and no hiccups happened
4:57 ramp down complete, began shutting down the evap2, will let the turbopump to slow down spin overnight.

2nd test polarity 2(swapped)

Tuesday, Aug 09 2022, 4pm begin pumping to vacuum after switching the polarity of the power supply

Wednesday, August 10, 2022, 13:09 begin ramping up

3:18 ramped to 671A. 2000C, no hiccups, everything is nominal. The thermocouple reads higher than before, about 20-30 deg C colder than pyro at high temperatures (1400C and above)

No bad connections, short circuits or unexpected overheating.

begin ramping down

ramping down was smooth, with error being the TC about 40 deg C colder than pyro at temp above 1500C

ramping done completed at Wednesday, August 10, 2022, 16:46 , shutting down evap 2 roughing and turbopump

Thursday, March 30, 2023, 12:27: 

Ta#65 LP-SIS target description: 

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

Foil Thickness = 0.033mm (0.0013") avg Measured. 

Target material batch: Ta 2023-1  Mt'l PO# TR-2022-03028

Target density = 18.2685 g/cm3

Target length = 3.40 cm

Total Mass = 62.113 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 460.8 g (w/ end caps)

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

Dimpling direction on foils/ Packs.                                                               --> Center <--

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

Tuesday, May 16, 2023, 10:44: End cap removed post conditioning to remove the rhenium foil. End cap replaced, & weight updated. Length remains the same.

Final desired temperature = 1900C.

Thursday, March 30, 2023, 12:41: RP on. 

Thursday, March 30, 2023, 12:42: Roughing 

Thursday, March 30, 2023, 12:44: OMEGA slope = 0.98. 

Thursday, March 30, 2023, 12:59: TP1 on. 

Thursday, March 30, 2023, 13:00: TP1 off.

Thursday, March 30, 2023, 13:03: Venting. (Steel pair of shields req'd - Install)

Thursday, March 30, 2023, 13:05: Roughing.

Thursday, March 30, 2023, 13:20: TP1 on. 

Thursday, March 30, 2023, 13:29: TP1 trip @ 38 krpm. Quick Reset. Fully "green". OK.

Thursday, March 30, 2023, 13:31: Vacuum @ 5.84e-05T. TGHT / TBHT PS on.

Thursday, March 30, 2023, 13:32: Operation Check. TGHT / TBHT tapped up to 5 / 5 A. Ok. Back to 0A. 

Friday, March 31, 2023, 06:32: Auto-ramping TGHT / TBHT to 500 / 200 A @ 2 A per minute. Vacuum @ 6.52e-07T.

Friday, March 31, 2023, 12:08: TGHT / TBHT @ 500 / 200 A. Vacuum @ 2.24e-06T. Temperature @ 1575 C. Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min

Friday, March 31, 2023, 13:05: TGHT / TBHT @ 580 / 230 A. Vacuum @ 3.69e-06T. Temperature @ 1748 C. Auto-ramping TGHT to 600 @ 2 A per min

Friday, March 31, 2023, 13:27: TGHT / TBHT @ 600 / 230 A. Vacuum @ 3.83e-06T. Temperature @ 1790 C. Auto-ramping TGHT to 620 @ 2 A per min

Friday, March 31, 2023, 13:42: TGHT / TBHT @ 620 / 230 A. Vacuum @ 4.34e-06T. Temperature @ 1820 C. Auto-ramping TGHT to 640 @ 2 A per min    

Friday, March 31, 2023, 13:51: TGHT / TBHT @ 640 / 230 A. Vacuum @ 5.51e-06T. Temperature @ 1858 C. Tap up TGHT to 650 A

Friday, March 31, 2023, 13:54: Vacuum @ 6.03e-06T. Temp @ 1902 C. Tapped up TGHT to 660 manually. Desired temperature reached. 

Friday, March 31, 2023, 13:57: Auto-cooling @ 2 A per minute.

Friday, March 31, 2023, 17:31:

Monday, April 03, 2023, 07:35: PS off. TP off. 

Darwin Ortiz Rosales wrote:

Wednesday, April 26, 2023, 09:32 LP FEBIAD loaded with 367 TiC discs and 4 TiC removable discs for analyses 50 packs of 5 and the rest are singles TaC coated (sintered) springs placed at both ends Initial total Weight = 521.83 g Initial heating @ 1A/min to 400 A on TGHT and 280A on TBHT OMEGA slope = 0.99 Vacuum limits up to 200A:  3.0e-05 Torr -- 5.0e-04 Torr Vacuum limit up after 200A: 3.0e-05 Torr -- 5.5e-05 Torr No Ta heat-shields used Initial IGP1 = 4.1e-07 Torr Wednesday, April 26, 2023, 09:49 Starting initial ramp up to 200A on both TGHT and TBHT @ 1A/min Wednesday, April 26, 2023, 12:50 Around 120A on TGHT, the pressure started to slowly drop.  First outgassing done. Wednesday, April 26, 2023, 14:03 IGP1 = 6.0 e-05 Torr TGHT = 200 A, 2.7V TBHT = 200 A, 2.6 v OMEGA = Below lower limit Waiting for pressure to fall below 5e0-5 Torr.  Will change bad vacuum to 5.0e-05 Torr and then continue ramping @1A/min to 400 A on TGHT and 280 A on TBHT. Wednesday, April 26, 2023, 14:13 IGPI= 4.2 e-05 Torr starting ramping to 400 A on TGHT and 280A on TBHT  Wednesday, April 26, 2023, 14:26 The IGP1 pressure just fell below 3.0e-05 Torr and ramping has resumed Wednesday, April 26, 2023, 14:42 pressure hovering around good vacuum so very slow progress. Wednesday, April 26, 2023, 15:12 TGHT= 223 A, 3.1 V TBHT = 226 A, 3.0 V Set ramp rate is 1A/min but real rate is slightly less than 0.5A/min due to pressure fluctuation.

 Vacuum spike at 300A.

Currently:

TGHT= 316A, 4.6V

TBHT=283A, 3.9V

Wednesday, April 26, 2023, 18:18 Ramping TBHT down from 280A to 270A

Carla Babcock wrote:

Darwin Ortiz Rosales wrote: Wednesday, April 26, 2023, 09:32 LP FEBIAD loaded with 367 TiC discs and 4 TiC removable discs for analyses 50 packs of 5 and the rest are singles TaC coated (sintered) springs placed at both ends Initial total Weight = 521.83 g Initial heating @ 1A/min to 400 A on TGHT and 280A on TBHT OMEGA slope = 0.99 Vacuum limits up to 200A:  3.0e-05 Torr -- 5.0e-04 Torr Vacuum limit up after 200A: 3.0e-05 Torr -- 5.5e-05 Torr No Ta heat-shields used Initial IGP1 = 4.1e-07 Torr Wednesday, April 26, 2023, 09:49 Starting initial ramp up to 200A on both TGHT and TBHT @ 1A/min Wednesday, April 26, 2023, 12:50 Around 120A on TGHT, the pressure started to slowly drop.  First outgassing done. Wednesday, April 26, 2023, 14:03 IGP1 = 6.0 e-05 Torr TGHT = 200 A, 2.7V TBHT = 200 A, 2.6 v OMEGA = Below lower limit Waiting for pressure to fall below 5e0-5 Torr.  Will change bad vacuum to 5.0e-05 Torr and then continue ramping @1A/min to 400 A on TGHT and 280 A on TBHT. Wednesday, April 26, 2023, 14:13 IGPI= 4.2 e-05 Torr starting ramping to 400 A on TGHT and 280A on TBHT  Wednesday, April 26, 2023, 14:26 The IGP1 pressure just fell below 3.0e-05 Torr and ramping has resumed Wednesday, April 26, 2023, 14:42 pressure hovering around good vacuum so very slow progress. Wednesday, April 26, 2023, 15:12 TGHT= 223 A, 3.1 V TBHT = 226 A, 3.0 V Set ramp rate is 1A/min but real rate is slightly less than 0.5A/min due to pressure fluctuation.  Vacuum spike at 300A. Currently: TGHT= 316A, 4.6V TBHT=283A, 3.9V Wednesday, April 26, 2023, 18:18 Ramping TBHT down from 280A to 270A

 Wednesday, April 26, 2023, 22:12

TGHT = 400A, 6.1V; TBHT = 274A/3.7V. Temp is holding sturdy ~1100 C and will leave it overnight.

Pressure is coming down, currently at 8.8 e-6 Torr.  See attachment for the overview. 

TGHT will continue to ramp up tomorrow morning; check the pressure to ensure it has come down below 5e-6 Torr before proceeding.  Refer to the instructions for details.   

Darwin Ortiz Rosales wrote:

John Wong wrote: Carla Babcock wrote: Darwin Ortiz Rosales wrote: Wednesday, April 26, 2023, 09:32 LP FEBIAD loaded with 367 TiC discs and 4 TiC removable discs for analyses 50 packs of 5 and the rest are singles TaC coated (sintered) springs placed at both ends Initial total Weight = 521.83 g Initial heating @ 1A/min to 400 A on TGHT and 280A on TBHT OMEGA slope = 0.99 Vacuum limits up to 200A:  3.0e-05 Torr -- 5.0e-04 Torr Vacuum limit up after 200A: 3.0e-05 Torr -- 5.5e-05 Torr No Ta heat-shields used Initial IGP1 = 4.1e-07 Torr Wednesday, April 26, 2023, 09:49 Starting initial ramp up to 200A on both TGHT and TBHT @ 1A/min Wednesday, April 26, 2023, 12:50 Around 120A on TGHT, the pressure started to slowly drop.  First outgassing done. Wednesday, April 26, 2023, 14:03 IGP1 = 6.0 e-05 Torr TGHT = 200 A, 2.7V TBHT = 200 A, 2.6 v OMEGA = Below lower limit Waiting for pressure to fall below 5e0-5 Torr.  Will change bad vacuum to 5.0e-05 Torr and then continue ramping @1A/min to 400 A on TGHT and 280 A on TBHT. Wednesday, April 26, 2023, 14:13 IGPI= 4.2 e-05 Torr starting ramping to 400 A on TGHT and 280A on TBHT  Wednesday, April 26, 2023, 14:26 The IGP1 pressure just fell below 3.0e-05 Torr and ramping has resumed Wednesday, April 26, 2023, 14:42 pressure hovering around good vacuum so very slow progress. Wednesday, April 26, 2023, 15:12 TGHT= 223 A, 3.1 V TBHT = 226 A, 3.0 V Set ramp rate is 1A/min but real rate is slightly less than 0.5A/min due to pressure fluctuation.  Vacuum spike at 300A. Currently: TGHT= 316A, 4.6V TBHT=283A, 3.9V Wednesday, April 26, 2023, 18:18 Ramping TBHT down from 280A to 270A  Wednesday, April 26, 2023, 22:12 TGHT = 400A, 6.1V; TBHT = 274A/3.7V. Temp is holding sturdy ~1100 C and will leave it overnight. Pressure is coming down, currently at 8.8 e-6 Torr.  See attachment for the overview.  TGHT will continue to ramp up tomorrow morning; check the pressure to ensure it has come down below 5e-6 Torr before proceeding.  Refer to the instructions for details.         Thursday, April 27, 2023, 06:27 IGP1= 1.7e-06 Torr OMEGA= 1097 C TGHT= 400A, 6.2V TBHT= 273A, 3.7 V Starting ramp up of TGHT @0.2A/min set to 550A

 Reached 550A on TGHT (paused there until I realized it was stopped) then resumed ramping to 580A at 0.2A/min. Saw both vacuum spikes before 550A. Attaching screenshot from John.

Darwin Ortiz Rosales wrote:

John Wong wrote: Carla Babcock wrote: Darwin Ortiz Rosales wrote: Wednesday, April 26, 2023, 09:32 LP FEBIAD loaded with 367 TiC discs and 4 TiC removable discs for analyses 50 packs of 5 and the rest are singles TaC coated (sintered) springs placed at both ends Initial total Weight = 521.83 g Initial heating @ 1A/min to 400 A on TGHT and 280A on TBHT OMEGA slope = 0.99 Vacuum limits up to 200A:  3.0e-05 Torr -- 5.0e-04 Torr Vacuum limit up after 200A: 3.0e-05 Torr -- 5.5e-05 Torr No Ta heat-shields used Initial IGP1 = 4.1e-07 Torr Wednesday, April 26, 2023, 09:49 Starting initial ramp up to 200A on both TGHT and TBHT @ 1A/min Wednesday, April 26, 2023, 12:50 Around 120A on TGHT, the pressure started to slowly drop.  First outgassing done. Wednesday, April 26, 2023, 14:03 IGP1 = 6.0 e-05 Torr TGHT = 200 A, 2.7V TBHT = 200 A, 2.6 v OMEGA = Below lower limit Waiting for pressure to fall below 5e0-5 Torr.  Will change bad vacuum to 5.0e-05 Torr and then continue ramping @1A/min to 400 A on TGHT and 280 A on TBHT. Wednesday, April 26, 2023, 14:13 IGPI= 4.2 e-05 Torr starting ramping to 400 A on TGHT and 280A on TBHT  Wednesday, April 26, 2023, 14:26 The IGP1 pressure just fell below 3.0e-05 Torr and ramping has resumed Wednesday, April 26, 2023, 14:42 pressure hovering around good vacuum so very slow progress. Wednesday, April 26, 2023, 15:12 TGHT= 223 A, 3.1 V TBHT = 226 A, 3.0 V Set ramp rate is 1A/min but real rate is slightly less than 0.5A/min due to pressure fluctuation.  Vacuum spike at 300A. Currently: TGHT= 316A, 4.6V TBHT=283A, 3.9V Wednesday, April 26, 2023, 18:18 Ramping TBHT down from 280A to 270A  Wednesday, April 26, 2023, 22:12 TGHT = 400A, 6.1V; TBHT = 274A/3.7V. Temp is holding sturdy ~1100 C and will leave it overnight. Pressure is coming down, currently at 8.8 e-6 Torr.  See attachment for the overview.  TGHT will continue to ramp up tomorrow morning; check the pressure to ensure it has come down below 5e-6 Torr before proceeding.  Refer to the instructions for details.         Thursday, April 27, 2023, 06:27 IGP1= 1.7e-06 Torr OMEGA= 1097 C TGHT= 400A, 6.2V TBHT= 273A, 3.7 V Starting ramp up of TGHT @0.2A/min set to 550A

 Thursday, April 27, 2023, 22:04

TGHT has reached 580A/10.33V. Temp = 1540C. 

The two out-gassing peaks were observed: 1st peak around 1300C and 2nd peak 1370C.  See attachments 1 & 2.

A few minutes after TGHT reached to 580A, there was a small jump in TGHT current/voltage and also the pressure, but didn't notice any change in the temp, see attachment 3&4. 

Pressure is currently at 3.4e-6 Torr; will hold TGHT until pressure reaches close to 1e-6 Torr before cooling down. 

 Friday, April 28, 2023, 01:06

Pressure has reached 1.8 e-6 Torr; TGHT has been holding at 580A for 3.5 hrs, a slight increase in voltage, reading at 10.45V and temperature, 1548C.  See attachment #5 for overview.

Initiating auto-cooling TGHT at -2A/min, TBHT at -1A/min.

Tuesday, May 02, 2023, 14:03

Two np-TiO2 spun fibrous pellets and 1 batch of fibre mats were wrapped with graphite foils and loaded into a target boat.

Sample will be heated to 1875C, similar to the previous process, see e-log ID#605 (TGHT: 440A/7.6V).

TGHT will be autoramped to 350 A and monitor the conditions before ramping up further.

Good vacuum: 3e-5 Torr

Bad vacuum: 5e-5 Torr

Omega slope: 1.08

In the previous process (ID#605), Ta-foil was inserted at both ends of the tubes to hold the sample together. However, it was observed that the out-gassing of the material reacted with the Ta-foil, causing issues. Therefore, it's decided not to cover the ends with Ta-foil, and the sensor is now looking at the graphite foil. It had previously determined the slope for SiC material set for its emissivity, but need to note any errors that may have arisen due to the change in the sample setup.

See attachment#1 for sample setup - note that Omega sensor is slightly looking at the edge of the Ta-boat tube. 

Initiate autoramp: 1 A/min

Chamber has been pumped down below 5.6e-6 Torr.

 Tuesday, May 02, 2023, 15:31

Vacuum spike TGHT at 75A, auto-ramping down kicked in.

 Wednesday, May 03, 2023, 12:18Thursday, May 04, 2023, 15:16

TGHT has been holding at 350A/5.7V (1995W) for almost 2hrs, temp is reading at 1368C - 232C lower than the previous process (ID#605) with TGHT = 348/5.8V (2018W).

Pressure started to come down around 344A/5.5V, temp 1331C - see attachment #2.

Current status overall view - see attachment #3

Continue to ramp up t0 440A at 1A/min and monitor.

 Wednesday, May 03, 2023, 14:47

TGHT reached 440A/7.5V, temp reading at 1672C.  Pressure is coming down, currently at 1.8e-6 Torr.  Will keep at this setting overnight and will check the Omega/emmissivity to confirm the temperature.

 Thursday, May 04, 2023, 10:54

Eractic vacuum spikes started just over 3 hrs ago.  Temp at 1681 C; TGHT has been stable at 440A/7.6V. Pressure ranging between 5.0e-7 to 1.5 e-6 and gradually decreasing, see attachment #4. 

Will perform the omega/emmissivity measurement.

 Thursday, May 04, 2023, 15:16

Temperature was checked with the digital and analogue pyrometers. 

With the analogue pyrometer on the Ta-container (left end, top surface), measured temp = 1360 C, with e=0.22, correction + 200 C => 1560 C

With the Omega pyrometer (right end), 1-color mode with e= 0.22, temp = 1585 C. 

Setting Omega pyrometer to 2-color mode with e= 0.99 temp = 1516 C --  this is in agreement with the measurements for Ta.  Note that the pyrometer is looking at some part of the Ta container which is not covered by the sample wrapped with the graphite foil (see attachment #5). 

From e-log#596, temp was reported at 1520 C (slope at 0.99) with a Ta-foil at the end of the tube, but from e-log#605, temp was reported at 1864 C (slope at 0.99) - possibly an error occurred during that time.

In conclusion, the temp should be at 1530 C +/- 10C with TGHT = 440A/7.7V (3388W).

 Thursday, May 04, 2023, 15:43

Vacuum spikes continue every 30 min lasting for 10 min. 

Tapped down TGHT to 430A/7.5V, temp reading at 1500 C.  Will monitor if any improvement with the vacuum.

 Friday, May 05, 2023, 09:34

Vacuum spikes continue to happen; see attachment #6 for the striptool overview.

Lower TGHT to 420A/7.3V, temp = 1480 C.

 Friday, May 05, 2023, 10:10

Vacuum spikes continue every 20-30 min lasting for 10 min. 

Lower TGHT to 410A/7.1V, temp = 1450 C

 Friday, May 05, 2023, 11:25

Vacuum spikes continue,

Lower TGHT to 400A/6.93V, temp = 1433 C

 Friday, May 05, 2023, 12:20

Vacuum spikes - lower TGHT to 390A/6.7V, temp at 1407C

Friday, May 05, 2023, 13:19

Vacuum spikes - lower TGHT to 380A/6.5V, temp at 1388C

Friday, May 05, 2023, 13:47

Vacuum spikes - lower TGHT to 370A/6.3V, temp at1373 C

Friday, May 05, 2023, 14:16

Vacuum spikes - lower TGHT 360A/6.1V, temp at 1348 C

Friday, May 05, 2023, 15:11

Vacuum spikes - lower TGHT 350A/5.9V, temp at 1308 C

Friday, May 05, 2023, 16:34

Vacuum spikes - lower TGHT 340A/5.7V, temp at 1371 C

Friday, May 05, 2023, 16:56

Vacuum spikes continue; container possibly broken.

Slow ramp down TGHT at -0.5A/min to see when the vacuum spikes would stop.

 Monday, May 08, 2023, 09:54

TGHT was ramped down over the weekend.  Chamber was kept under vacuum and vacuum continued to spike; suspecting problem with the gauge?! see attachment &7 for an over view.

Will take out the samples for exam.

Nb#10 LP-IG-LIS target description:

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

Foil Thickness = 0.025mm (0.001")

Target density =  7.36 g/cm3

Target length = 3.5 cm

Total Mass = 25.7576 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  438 g (w/ end caps)

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

Dimpling direction on foils/ Packs.                                                               --> Center <--

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

Wednesday, June 21, 2023, 10:37: Roughing.

Wednesday, June 21, 2023, 13:39: TP1 on. 

Wednesday, June 21, 2023, 13:55: TGHT / TBHT PS on. Vacuum @ 3.35e-05T

Thursday, June 22, 2023, 13:16: TGHT / TBHT Manually set to 5 / 5 A. Vacuum @ 8.17e-07T.

Final desired temperature = 1900C.

Thursday, June 22, 2023, 13:49: OMEGA slope = 0.98.

Friday, June 23, 2023, 06:24: Auto-ramping TGHT / TBHT to 580 / 230 @ 2 A per min. 

Friday, June 23, 2023, 12:11: TGHT / TBHT @ 580 / 230 A (568 / 233 A). Auto-ramping TGHT to 610 A @ 2 A per min (600 A w/ offset). Temperature @ 1697 C. Vacuum @ 3.38e-06T.

Friday, June 23, 2023, 12:32: TGHT / TBHT @ 610 / 230 A (600 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min (620 A w/ offset). Temperature @ 1748 C. Vacuum @ 4.61e-06T.

Friday, June 23, 2023, 12:44: TGHT / TBHT @ 630 / 230 A (617 / 233 A). Auto-ramping TGHT to 650 A @ 2 A per min (640 A w/ offset). Temperature @ 1790 C. Vacuum @ 5.74e-06T.

Friday, June 23, 2023, 13:07: TGHT / TBHT @ 650 / 230 A (638 / 233 A). Auto-ramping TGHT to 670 A @ 2 A per min (660 A w/ offset). Temperature @ 1825 C. Vacuum @ 5.90e-06T.

Friday, June 23, 2023, 13:22: TGHT / TBHT @ 670 / 230 A (658 / 233 A). Auto-ramping TGHT to 680 A @ 2 A per min (668 A w/ offset). Temperature @ 1858 C. Vacuum @ 6.75e-06T. 

Friday, June 23, 2023, 13:29: TGHT / TBHT @ 680 / 230 A (667 / 233 A). Auto-ramping TGHT to 690 A @ 2 A per min (677 A w/ offset). Temperature @ 1877 C. Vacuum @ 6.99e-06T. 

Friday, June 23, 2023, 13:37: Manually tap up to temperature. 

Friday, June 23, 2023, 13:38: Vacuum @ 7.54e-06T. TGHT /  TBHT @ 694 / 230 A (680.5 / 233 A direct w/ offset). Temperature @ 1901-1902 C. Desired Temperature Reached.

Friday, June 23, 2023, 13:42: Auto-cooling @ 2 A per min. 

 Nb#11 LP-IG-LIS target description:

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

Foil Thickness = 0.025mm (0.001")

Target density =  7.13 g/cm3

Target length = 3.53 cm

Total Mass = 25.165 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  434 g (w/ end caps)

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

Dimpling direction on foils/ Packs.                                                               --> Center <--

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

Final desired temperature = 1900C.

Replacement for Nb#10

Thursday, August 24, 2023, 14:16: Roughing.

OMEGA slope = 0.98.

Thursday, August 24, 2023, 14:31: Turbo pump started. 

Thursday, August 24, 2023, 14:41: TGHT / TBHT PS on. Manually test @ 5 / 5 A. ok. Tap back to 0 A. 

Thursday, August 24, 2023, 18:26: Vacuum @ 4.35e-06T. Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per minute. 

Thursday, August 24, 2023, 22:00: TGHT / TBHT @ 414 / 230 A (406 / 233 A - Offset). Auto-ramping TGHT to 580 A @ 2 A per min continued. Temperature @ 1353 C. Vacuum @ 4.03e-06T. 

Thursday, August 24, 2023, 23:29: TGHT / TBHT @ 580 / 230 A (569 / 233 A). Auto-ramping TGHT to 610 A @ 2 A per min (approx 600 A w/ offset). Temperature @ 1708 C. Vacuum @ 6.61e-06T. 

Thursday, August 24, 2023, 23:49: TGHT / TBHT @ 610 / 230 A (598 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min (620 A w/ offset). Temperature @ 1765 C. Vacuum @ 7.22e-06T. 

Friday, August 25, 2023, 00:04: TGHT / TBHT @ 630 / 230 A (618 / 233 A). Auto-ramping TGHT to 650 A @ 2 A per min (640 A w/ offset). Temperature @ 1808 C. Vacuum @ 7.54e-06T. 

Friday, August 25, 2023, 00:16: TGHT / TBHT @ 650 / 230 A (638 / 233 A). Auto-ramping TGHT to 670 A @ 2 A per min (660 A w/ offset). Temperature @ 1845 C. Vacuum @ 7.72e-06T. 

Friday, August 25, 2023, 00:27: TGHT / TBHT @ 670 / 230 A (657 / 233 A). Auto-ramping TGHT to 680 A @ 2 A per min (668 A w/ offset). Temperature @ 1880 C. Vacuum @ 8.46e-06T. 

Manually tap up to temperature.

Friday, August 25, 2023, 00:34: TGHT / TBHT @ 682 / 230 A (669 / 233 A). Temperature @ 1900-1901 C. Vacuum @ 8.59e-06T. Desired Temperature Reached.

Friday, August 25, 2023, 00:37: Auto-cooling @ 2 A per min. 

Friday, August 25, 2023, 06:15: 

Friday, August 25, 2023, 07:40: PS & TP off.

 Ta#66 LP-SIS target description: 

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

Foil Thickness = 0.033mm (0.0013") avg Measured. 

Target material batch: Ta 2023-1  Mt'l PO# TR-2022-03028

Target density = 12.446 g/cm3

Target length = 5.0 cm

Total Mass = 62.230 g [Incl foils + Ta wire on 6 packs]

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

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

Dimpling direction on foils/ Packs.                                                               --> Center <--

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

Desired temperature 1900C

Wednesday, September 20, 2023, 14:18: Roughing. 

Wednesday, September 20, 2023, 14:35: TP Started. 

Wednesday, September 20, 2023, 14:43: TP on. 

Wednesday, September 20, 2023, 14:45: TGHT / TBHT raised to 5 / 5 A & lowered. Quick check ok. 

Thursday, September 21, 2023, 07:47: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min. Vacuum @ 8.30e-07T.

Thursday, September 21, 2023, 09:54: Slope set to 0.98 

Thursday, September 21, 2023, 13:42: TGHT / TBHT @ 580 / 230 A (568 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min (640 A w/ offset). Temperature @ 1748 C. Vacuum @ 2.47e-06T.

Thursday, September 21, 2023, 14:10: TGHT / TBHT @ 630 / 230 A (618 / 233 A). Auto-ramping TGHT to 650 A @ 2 A per min (640 A w/ offset). Temperature @ 1843 C. Vacuum @ 3.30e-06T.

Thursday, September 21, 2023, 14:23: TGHT / TBHT @ 650 / 230 A (638 / 233 A). Auto-ramping TGHT to 660 A @ 2 A per min (648 A w/ offset). Temperature @ 1879 C. Vacuum @ 3.77e-06T.

Thursday, September 21, 2023, 14:29: Tapped TGHT to 662.  TGHT / TBHT @ 662 / 230 A (649 / 233 A). Temperature @ 1903 C. Vacuum @ 4.08e-06T. Desired Temperature reached.

Thursday, September 21, 2023, 14:33: Auto-cooling started @ 1 A per min.

Monday, September 25, 2023, 08:09: Turbo pump off. 

Ta#(Spare) LP-SIS target description: 

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

Foil Thickness = 0.033mm (0.0013") avg Measured. 

Target material batch: Ta 2023-1  Mt'l PO# TR-2022-03028

Target density = 12.515 g/cm3

Target length = 4.97 cm

Total Mass = 62.202 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven =  461g (w/ end caps)

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

Dimpling direction on foils/ Packs.                                                               --> Center <--

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

Was labelled Ta#67 until the Thin foil target 45447-14 became so.

Thursday, October 05, 2023, 12:44: Roughing. 

Thursday, October 05, 2023, 13:10; TP1 on.  

Thursday, October 05, 2023, 13:11: TGHT / TBHT test. Tap up to 5 / 5 A & back to 0 A. Ok.

Thursday, October 05, 2023, 13:13: Slope Set @ 0.98 

Friday, October 06, 2023, 05:54: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min. 

Friday, October 06, 2023, 11:50: TGHT / TBHT @ 580 / 230 A (568 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min (640 A w/ offset). Temperature @ 1716 C. Vacuum @ 2.76e-06T.

Friday, October 06, 2023, 12:20: TGHT / TBHT @ 630 / 230 A (618 / 233 A). Auto-ramping TGHT to 650 A @ 2 A per min (640 A w/ offset). Temperature @ 1809 C. Vacuum @ 3.77e-06T.

Friday, October 06, 2023, 12:37: TGHT / TBHT @ 650 / 230 A (638 / 233 A). Auto-ramping TGHT to 665 A @ 2 A per min (650 A w/ offset). Temperature @ 1844 C. 

Friday, October 06, 2023, 12:53: Tapped up to TGHT / TBHT @ 670/ 230 A (657 / 233 A). Temperature @ 1880 C. Vacuum @ 4.94e-06T. 

Friday, October 06, 2023, 12:57: Tapped TGHT to 675.  TGHT / TBHT @ 675 / 230 A (662 / 233 A). Temperature @ 1889 C. Vacuum @ 5.03e-06T. 

Friday, October 06, 2023, 13:00: Tapped TGHT to 682.  TGHT / TBHT @ 682 / 230 A (669 / 233 A). Temperature @ 1901 C. Vacuum @ 5.46e-06T. Desired Temperature reached.

Friday, October 06, 2023, 13:01: Auto-cooling @ 2 A per min.

Tuesday, October 10, 2023, 08:37: PS & TP off. 

 Ta#67 Thin foil LP-SIS target description: 

Total Ta foils = 470 loaded into 2 packs of 235 foils each.

Foil Thickness = 0.010mm (0.0004") avg Measured. 

Target material batch:  https://elog.triumf.ca/TIS/Target+Production/143

Target density = 4.498 g/cm3

Target length = 3.7465 cm

Total Mass = 16.8509 g [Incl foils + Ta wire on 2 packs]

Total mass w/ Target oven =  415g (No end caps)

Discs in target are arranged as follows: 2packs

Dimpling direction on foils/ Packs.                                                               --> Center <--

No Ta foil heat shield added

Monday, July 22, 2024, 14:53: Roughing. 

Halt roughing. Install heat plates.

Monday, July 22, 2024, 15:06: Roughing.

Monday, July 22, 2024, 15:26: TP On.

Monday, July 22, 2024, 15:34: TP Timeout. Restart. 

Monday, July 22, 2024, 15:35: TP at speed (Green) 

Monday, July 22, 2024, 15:36: PS On. TGHT / TBHT to 5/5 A manually. OK. Tap down. 

Tuesday, July 23, 2024, 07:03: Auto-ramping TGHT / TBHT to 120 / 60 A @ 2 A per min. Desired temperature 1900 C.

Tuesday, July 23, 2024, 08:02: OMEGA IR2C Laser off. Slope set to 0.98. 

Tuesday, July 23, 2024, 08:06: Auto-ramping TGHT / TBHT to 300 / 150 A @ 2 A per min. 

Tuesday, July 23, 2024, 09:57: Auto-ramping TGHT / TBHT to 500 / 200 A @ 2 A per min. Temperature @ 1022 C. 

Tuesday, July 23, 2024, 11:59: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min. Temperature @ 1538 C.

Tuesday, July 23, 2024, 12:46: TGHT / TBHT @ 580 / 230 A (569 / 233 A). Temperature @ 1710 C. Vacuum @ 7.44e-06T. 

Tuesday, July 23, 2024, 14:23: TGHT / TBHT @ 580 / 230 A (568 / 233 A). Auto-ramping TGHT to 620 A @ 2 A per min. Temperature @ 1721 C. Vacuum @ 5.06e-06T. 

Tuesday, July 23, 2024, 14:48: TGHT / TBHT @ 620 / 230 A 609 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min. Temperature @ 1799 C. Vacuum @ 6.76e-06T.  

Tuesday, July 23, 2024, 14:56:  TGHT / TBHT @ 630 / 230 A 618 / 233 A). Temperature @ 1816 C. Vacuum @ 7.14e-06T. Tapping up manually TGHT to get to 1900degC 

Tuesday, July 23, 2024, 15:23:  TGHT / TBHT @ 670 / 230 A 657 / 233 A).  Temperature @ 1890 C. Vacuum @ 9.94e-06T.  Stopping and waiting for 5min.

Tuesday, July 23, 2024, 15:39: Target ramp down 2A/min to 0 both TGHT and TBHT. 

Wednesday, July 24, 2024, 08:50: TP off.

Wednesday, July 24, 2024, 09:18: Venting.

Wednesday, July 24, 2024, 10:28: Target removed. EVAP2 clear. 

 Thursday, July 25, 2024, 15:18

Target container consists of two np-Ta fibres disk samples. Both disks are made from heat stabilized np-Ta fibres (150 C for 17 hours) and were pressed at 8 tons / 300 MPa.

Sample 1 was made from np-Ta fibres spun using Dope solution #1. Sample 1 disk has an average thickness of 0.727 mm and a diameter of 17.113 mm. Mass of the green sample 1 disk is 0.1957 g. 

Sample 2 was made from np-Ta fibres spun using Dope solution #6. Sample 2 disk has an average thickness of 0.688 mm and a diameter of 17.123 mm. Mass of the heat stabilized fibres used to make the green sample 2 disk is 0.1860 g. Mass loss from pressing the heat stabilized fibres was virtually zero. Therefore, although the mass of the green sample 2 disk was not measured, it can be extrapolated to be 0.1860 g. 

Target container was wrapped with Ta foil. Each sample disk was wrapped in graphite foil and placed inside the target container horizontally near the center. 

Omega slope was initially set to 0.980. After reviewing previous logbook on np-Ti (e-log ID#633), changed the Omega slope to 0.990. 

Chamber is currently being pumped down. The current reading (as of 15:40) is 4.70e-05 Torr. 

Two heating schedules will be tested. Heating schedule 1 entails heating both sample disks at ~1000 C until the pressure reaches below 1.00e-06 Torr. Once heating schedule 1 is completed, sample 1 will be removed. Heating schedule 2 entails heating sample 2 to ~1800 C until the pressure reaches below 1.00e-06 Torr. TGHT is estimated to be approximately 440A/7.6V to reach 1875 C (348A/5.8V to hold temperature at 1600 C). Refer to e-log ID#605. 

Marla Cervantes wrote:

Marla Cervantes wrote: Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on Wednesday, August 14, 2024, 10:18 The turbo pump started up normally. System is purging. and tomorrow the target will be heated.

 Wednesday, August 14, 2024, 16:19

• Next ramping: 0.5 A/ 2min  to 250 A.

Very slow rate to allow thermal equilibrium and temperature measurements. Estimated time 3h.

Thursday, August 15, 2024, 08:21

IGP1 = 5.3e-7 Torr

Good vacuum 3e-5 Torr

Bad vacuum 5e-5 Torr

Initial ramping: 2 A/min to 200 A.

Thursday, August 15, 2024, 09:01. Pressure starting to increase at 74 A

Thursday, August 15, 2024, 09:15. Pressure stabilizing 1.8e-6 Torr. Current 103 A, voltage 1.3 V

Thursday, August 15, 2024, 09:21. Pressure increasing (116 A).

 Thursday, August 15, 2024, 09:29 Pressure dropping (Current approx. 120 A)

Thursday, August 15, 2024, 10:54

Started ramping to find a pressure peak corresponding to V vaporization.

IGP1 = 6.4e-7

TGHT = 200 A, 2.9 V, omega 1152 °C

Next ramping: 0.5 A/ 2min  to 250 A

Thursday, August 15, 2024, 11:17

Ramp seem to slow. The temperature change was too subtle (according to the omega).

IGP1 = 6.5e-7

TGHT = 205 A, 3.03 V, omega 1157 °C

Next ramping: 1 A/ 2min  to 250 A

Thursday, August 15, 2024, 11:32

Ramp changed to 0.5 A/min

Thursday, August 15, 2024, 11:54

Ramp was stopped because the pressure was increasing, suggesting the V vaporization.

IGP1 = 6.9e-7

TGHT = 222 A, 3.3 V

Omega 1210 °C, filament 1280 °C

The difference between pyrometers is negligible, suggesting that the V vaporization temperature at 6e-7 Torr of approx. 1300 °C

 Thursday, August 15, 2024, 13:15

IGP1 = 7.9e-7

TGHT = 250 A, 3.8 V

Omega 1289 °C

Thursday, August 15, 2024, 13:16

Ramp set to 0.5 A/min to 300 A

 Pressure mini-spike at 13:18

Omega reading 1291 °C

Thursday, August 15, 2024, 14:08

IGP1 = 8.5e-7

TGHT = 270 A, 4.18 V

Omega 1375 °C, filament 1400 °C

The system stayed at those conditions for 15min

Thursday, August 15, 2024, 14:11

Ramping to 0A at 2A/min

Monday, August 19, 2024, 13:06

Target container consists of 2 samples, and both samples were heat stabilized at 150 C for 24 hours then pre-oxidized at 360 C for 4 hours:

1.  PVP (7% wt/v) spun fibres 0.0569 g

2.  np-Ta (Dope 7) spun fibres: 0.1730 g

Samples are wrapped in graphite foil and loaded into a target boat which is wrapped with Ta foil.

Omega slope set at 0.99.

Similar heat treatment as the 1st attempt, see e-log #667 (1800 C = 402A/7.2V).

Good vac = 3 e-5 Torr

Bad vac = 5 e-5 Torr.

Chamber is currently pumping down.

 Monday, August 19, 2024, 16:52

Chamber pressure @ 4.6e-6 Torr.

Initiate auto-ramping at 1A/min to reach 400A.

Continue to monitor the pressure and TGHT.

Tuesday, August 20, 2024, 09:48

TGHT reached 400 A/6.87V about 10 hr ago.  But the temperature has been holding at 1665 C. 

The voltage is much lower this time compared to the previous heat treatment.  See attachment #1 for the overall process.

Ramping up to 450A.  Continue monitoring..

Tuesday, August 20, 2024, 15:43

TGHT at 450A (readback 441A)/7.892V, temperature holding at 1803C

Pressure coming down from 1.62e-6 Torr. 

Continue to hold on the temperature for a few more hours before cooling it down

 Wednesday, August 21, 2024, 09:40

Temperature was holding for about 18 hours before ramping down TGHT was initiated at 2A/min.

The samples can be taken out after 2 pm.

John Wong wrote:

Nikita Bernier wrote: Nikita Bernier wrote: Thursday, April 05, 2012, 16:31 Target boat contains 6 BeO pellets : Sample,   Mass (g),   Thickness (mm),   Density (g/cm3) 1   1.2842,    5.406,        1.4647 2   1.2619,    5.150,        1.5108 3   1.2886,    5.316,        1.4946 4   1.2858,    5.310,        1.4931 5   1.3382,    5.520,        1.4948 6   1.3916,    5.650,        1.5187   Samples are made of BeO powder with 30% PVB which was treated at 400 RPM for 26 minutes. A ratio of 1:0.1 of mineral oil was added before another high speed treatment for 10 minutes. The powder was then pressed into pellets. Pellets are loaded on a target boat coated/sintered with TaC. The target boat is wrapped with a Ta foil that is 0.002 inches thick. **** Sintering is postponed until the situation with the ventilation in the lab06 is cleared. ****    Tuesday, May 22, 2012, 16:44 Target chamber is currently being pumped down. Leak check will be done tomorrow by turning on the cooling water for the heat shield.  Wednesday, May 23, 2012, 17:38 TGHT was stepped up to about 55A before the auto ramping was initiated.  The vacuum limit parameter was set for good vac at <4.0 e-5 Torr and bad vac at >5.0 e0-5 Torr.  The pressure is coming close to the trip limit (8.5 e-5 Torr) (see attachment 1: strip tool over the past 5 hours).  Changed the vacuum limit parameter:  good vac =3.0e-5 Torr, bad vac= 4.0e-5 Torr.   Saturday, May 26, 2012, 10:44 TGHT is auto ramping up smoothly as the pressure is regulating between 1e-5 to 4 e-5 torr.  (See attachment 2, past 21 hr) Sunday, May 27, 2012, 12:25   There could be a power bump  early this morning at 06:30hr, and tripped off the TGHT power supply (see attachment #3).  The computer in the cold lab was found to be off expectedly, so the alarm handler running on that computer was also shut off (*Need a UPS on this computer!)   Called the ISAC Ops, and  nothing about any power bump around that time was noticed.   Turned on TGHT p/s and set TGHT at 318A, local at 315A/4.58V.  TGHT has been running for about 10 mins.  Currently vac at 4.2e-7 Torr.   Sunday, May 27, 2012, 12:35 Initiating TGHT auto ramping...   Monday, May 28, 2012, 00:20 TGHT has reached to 600A and will remain at that current for the rest of the night.  The target oven temperature will be measured tomorrow. See attachment#4 for the striptool over the past 10hr.  Monday, May 28, 2012, 10:56 TGHT stayed at 600A for about 12 hours.  Pressure gradually came down to 7.6e-7 Torr. (See attachment #5).  At TGHT=600A, The target boat temperature was measured at 1400C (with the pyrometer), and the Ta-heat shield (1-layer) was at 1050C. [Note: These temperature measurements are very closed to the measurements with an empty LP target (with not heat shield), TGHT @ 600A = 1360C]. Monday, May 28, 2012, 11:04 Due to the water leak from the Evap2 chiller, the system has to be shut off for inspection.  TGHT was tapped down to 0A.  The target was cooled down for about 20min before the chiller was turned off. Will continue with the process after the problem is solved...

 Tuesday, May 29, 2012, 15:30

Evap2 was vented out and the pellets were taken out of the boat and examined.

The six pellets are cracked and have a greyish colour. The cracking is probably caused by the instant cooling and reheating when the system tripped on Sunday morning.

The light grey colour and white spots suggest that the sintering process was not completed and so the shrinkage cannot be determined.

A new batch of BeO pellets will have to be prepared and sintered in order to determine the dimensions of the final die.

John Wong wrote:

Nikita Bernier wrote: Wednesday, June 20, 2012, 17:23 New Target boat, with no coating, wrapped with a 0.002 inches thick Ta foil, contains NiO D-shape discs : Sample,   # Disks,    Mass (g),    Thickness (mm) 1    12,  1.9396,  1.938 2    13,  0.9592,  0.847 3    25,  2.6675,  3.06 See John's Ipad for their recipes. Evaporator #2 is now auto-ramping overnight at 0.5 A/min, up to 580 A, with the maximum voltage limited at 14 V, between 3.00e-05 (Good vacuum) and 4.00e-05 Torr (Bad vacuum).   Wednesday, June 20, 2012, 22:28 TGHT tripped off at 78A due to high out-gassing pressure.  The current was tapped down to 75A before it was turned back on.  Changed ramping rate from 0.5A/min to 0.2A/min.   Initiate auto-ramping...   Thursday, June 21, 2012, 08:35 Vacuum has come down to 7e-7 as TGHT is being ramped up at 0.2A/min. (see attachment#1). Increase TGHT rate to 2A/min. The temperature should be measured when the heater gets up to around 500A.

 Thursday, June 21, 2012, 17:37

The NiO discs were heated up to 1500C at 560A.  The target heater was lowered in steps and the temperature was measured.  At 320A, the target container was ~1110C.  (see attachment #1) 

There was a sign of resistant on the target container as the p/s voltage started to go up at a higher rate.  (see attachment#2, 3, 4 for the archived striptool).

Unfortunately, the target container was broken; it was most likely reacted with the Ni.  (see attachment#5)

So.... the possible solution?!  TRY coating the container with Ta2O5.  Will discuss more in the Friday Jun 22 meeting. 

Nikita Bernier wrote:

Nikita Bernier wrote: Nikita Bernier wrote:  Friday, August 10, 2012, 19:54   Target boat with TaC coating, inside covered with a 0.002 inches thick Ta foil, wrapped with a 0.002 inches thick Ta foil, contains a Ta foil with TaO coating. See John's Ipad for their recipes. Evaporator #2 is now auto-ramping overnight at 0.2 A/min, up to 830 A, with the maximum voltage limited at 14 V, between 2.00e-05 (Good vacuum) and 3.00e-05 Torr (Bad vacuum).    Saturday, August 11, 2012, 19:15 Heating process was going smoothly up to 400 A. See Attachment 1. Around 420 A, vacuum went up again and the voltage increased more quickly. It seems like resistance is building up. After reaching 530 A, the current was tapped down to 420 A in an effort to save the Ta boat. See Attachment 2. The current will stay at 420 A for the weekend until John takes a look at this.    Monday, August 13, 2012, 13:46  TGHT was ramped down at 2 A/min and then tapped down to 0A. See Attachment 1.  The target boat will be cooled down for about an hour before turning off the chiller.

 Tuesday, August 14, 2012, 16:56

Summary:

The purpose of this experiment is to test the chemical and high temperature (1600C) resistance of a Ta foil (0.001" thick) coated with Ta2O5, so it can be used as the under-layer for the BeO sintering process.

The Ta2O5 (white powder, -325 mesh) was prepared in a non-aqueous solution and was sprayed on a piece of Ta foil. 

The coated foil was rolled up and inserted in a Ta-coated (previously sintered) target boat for heating.

The foil was heated up to 520A (~1200C) and evidently,Ta2O5 started to react with Ta foil, and the foil became brittle and cracked (see attachment#1).

In conclusion, Ta2O5 is not a good protection layer for Ta material - at least for our applications.