ID |
Date |
Author |
Target Material |
Target Oven W.O# |
Source |
Status |
Subject |
688
|
Friday, March 28, 2025, 10:34 |
Darwin Ortiz Rosales | Empty | 45447-20 | LP-SIS | Done | TaC coating sintering | Friday, March 28, 2025, 06:49
The coated container was wrapped in 4 Ta foil heatshields.
Vacuum IGP1 initial =8.0e-07 Torr
Target temperature on OMEGA= 1800-1850 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~400A (adjustable)
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Starting ramp at 2A/min
Friday, March 28, 2025, 09:41
At 412A readback on TGHT OMEGA reads 1702 C. Maybe re-use of Ta heatshields resulted in loss of efficiency. Will ramp to 420 A and leave for 4 hours.
Friday, March 28, 2025, 14:25
Started rampdown at -2A/min TGHT and -1A/min TBHT |
687
|
Tuesday, March 25, 2025, 15:26 |
Darwin Ortiz Rosales | Empty | 45447-16 | LP-SIS | Done | TaC coating sintering | Tuesday, March 25, 2025, 15:25
The coated container as wrapped in 4 Ta foil heatshields.
Vacuum IGP1 initial =e-07 Torr
Target temperature on OMEGA= 1800-1850 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~400A (adjustable)
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Will be left overnight to pump down
Wednesday, March 26, 2025, 09:07
starting ramp up at 2A/min to 230A for both TGHT and TBHT
Wednesday, March 26, 2025, 12:48
1800 C at 400A TGHT, 6.9V TGHT
Leaving for 4 hours |
686
|
Thursday, March 20, 2025, 06:10 |
Darwin Ortiz Rosales | Empty | 45447-19 | LP-SIS | Done | TaC coating sintering | Wednesday, March 19, 2025, 13:08
The coated container was wrapped in 4 Ta foil heatshields.
Vacuum IGP1 initial =
Target temperature on OMEGA= 1800-1850 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~400A (adjustable)
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Thursday, March 20, 2025, 06:10
IGP1 initial = 6.1e-7 Torr
start ramp at 2A/min
Thursday, March 20, 2025, 07:04
paused ramp to prevent pressure spike
Thursday, March 20, 2025, 10:16
OMEGA 1800 C @ TGHT = 402A, 6.8V
Will leave for 4 hours.
Thursday, March 20, 2025, 13:53
Starting rampdown at 2A/min TGHT and 1A/min TBHT |
685
|
Tuesday, March 18, 2025, 06:53 |
Darwin Ortiz Rosales | Empty | 45447-6 | LP-IG-LIS | Done | TaC coating sintering | Tuesday, March 18, 2025, 06:48
The coated container was wrapped in 4 Ta foil heatshields.
Vacuum IGP1 initial =9.1 e-07 Torr
Target temperature on OMEGA= 1850-1900 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~400A (adjustable)
Heating autoramp starged a 2A/min on TGHT and TBHT
to =300 A TGHT and 230A TBHT
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Tuesday, March 18, 2025, 13:47
OMEGA read 1850C at 380A on TGHT. The temperature dropped and current was raised to 390A, 6.5V on TGHT.
TBHT was kept at 230A, 3.2V
Temperature dropped to 1756 after 4 hours of sintering. Will start rampdown at -2A/min for TGHT and -1A/min TBHT.
|
684
|
Wednesday, March 12, 2025, 07:10 |
Darwin Ortiz Rosales | Endcaps | | TARGET BOAT | Done | TaC coating sintering | Tuesday, March 11, 2025, 15:44
The coated container was wrapped in 3 Ta foil heatshields.
16 caps and 4 springs
Target temperature on OMEGA= 1750-1800C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= N/A
Final TGHT current= ~400A (adjustable)
Wednesday, March 12, 2025, 07:07
Heating autoramp started at 1A/min on TGHT 90A
Then at 4A/min to 400 A.
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
IGP1 initial =4.8e-07 Torr
Wednesday, March 12, 2025, 09:52
starting ramp at 2A/min to 400A
Wednesday, March 12, 2025, 10:21
increasing ramp to 4A/min (2A/30s)
Wednesday, March 12, 2025, 11:57
TGHT=441A, 7.2V
Will keep for 4 hours
1750C
Wednesday, March 12, 2025, 15:57
starting rampdown at -2A/min |
683
|
Monday, March 10, 2025, 09:56 |
Darwin Ortiz Rosales | Empty | 45447-3 | HP-FEBIAD | Done | TaC coating sintering |
Monday, March 10, 2025, 09:50
The coated container was wrapped in 4 Ta foil heatshield and left in evap2 over weekend to decrease pressure.
Target temperature on OMEGA= 1850-1900 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~650A (adjustable)
Heating autoramp starged at 2A/min on TGHT and TBHT to 120A
Then at 2 A/min to =400 A TGHT and 230A TBHT
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Initial IGP1=
Monday, March 10, 2025, 10:36
Initial IGP1= 8.5 e-06 torr
Starting ramp to 120A for both TGHT and TBHT
Monday, March 10, 2025, 16:57
RD TGHT =686A set to 700A, 10.8V
TBHT = 230A, 3.1V
OMEGA= 1710
Will leave for 4 hours
Monday, March 10, 2025, 20:42
IGP1=7.9e-06 Torr
OMEGA= 1750 C
TGHT = 686 A, 10.8V
TBHT= 230A, 3.1 V
starting rampdown at -2A/min TGHT and -1A/min TBHT
|
682
|
Monday, March 03, 2025, 17:58 |
Darwin Ortiz Rosales | Empty | 45447-21 | LP-FEBIAD | Done | TaC coating sintering | Monday, March 03, 2025, 17:56
LP FEBIAD WO# 45447-21 initial wt=471.0 g (without T bar)
wrapped in 4 Ta heatshields.
Will heat at 2A/min to 95A on TGHT and TBHT
Then will heat at 2A/min to 1800 C ~400A on TGHT and 230A on TBHT
Monday, March 03, 2025, 18:01
IGP1=3.3e-06 Torr
started initial ramp to 95A
Monday, March 03, 2025, 21:52
Start 4 hour count at 940 pm
OMEGA reading 1750 C
TGHT= 435 A set and RD = 426 A, 7.0V
TGHT = 230A
Tuesday, March 04, 2025, 01:42
Start rampdown |
681
|
Saturday, February 01, 2025, 09:24 |
Darwin Ortiz Rosales | Empty | 45447-28 | HP-SIS | Done | TaC coating sintering | Saturday, February 01, 2025, 09:23
The coated container was wrapped in 4 Ta foil heatshield and left in evap2 over night to attain vacuum.
Target temperature on OMEGA= 1850-1900 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~650A (adjustable)
Heating autoramp starged at 1A/min on TGHT and TBHT to 120A
Then at 2 A/min to =400 A TGHT and 230A TBHT
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Initial IGP1=5.6e-07Torr
Saturday, February 01, 2025, 11:05
@ 194A, 2.5V on TGHT, the pressure is dropping (has been dropping since 150A). starting ramp at 4a/min
Thursday, February 13, 2025, 11:40
Log entries lost as computer rebooted. Max temperature on OMEGA was 1850 C and held for 4 hours. Cooled @ -2A/min TGHT and -1A/min TBHT. |
680
|
Thursday, January 30, 2025, 09:21 |
Darwin Ortiz Rosales | Empty | 45447-30 | HP-SIS | Done | TaC coating sintering | Thursday, January 30, 2025, 09:17
Left to pump down on previous night
The coated container was wrapped in 4 Ta foil heatshields.
Vacuum IGP1 initial =8.1 e-06 Torr
Target temperature on OMEGA= 1850-1900 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~500A (adjustable)
Heating autoramp starged at 0.5A/min(1A/120s) to 60A on both TGHT and TBHT
Then at 0.5A/min to 90 A, both TGHT and 230A TBHT
When pressure stable will ramp at 2A/min to ~500A on TGHT and 230A on TBHT
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Thursday, January 30, 2025, 09:20
currently ramping to 90A
Thursday, January 30, 2025, 12:30
Ramping to 120A @ 0.5 A/min
Thursday, January 30, 2025, 13:59
Ramping to 140 A at 1A/min (to check pressure change. So far with slower heating, pressure has not spiked very high).
Thursday, January 30, 2025, 15:59
Started ramping @ 2A/30s to 500 A on TGHT
TBHT is at 230A
Thursday, January 30, 2025, 21:25
Target was sintered when OMEGA reading 1700-1750 C
At 640-660A on TGHT RD
Check target coating and repeat these setting if good.
Thursday, January 30, 2025, 21:43
Cooling started at -2A/min on TGHT and -1A/min TBHT
|
679
|
Saturday, November 23, 2024, 11:11 |
Darwin Ortiz Rosales | ZrC | | LP TUBE | Done | ZrC 24E9T1 + std conditioning and sintering | Saturday, November 23, 2024, 11:08
No milling ZrC material sintering inside graphite cartridge
baseline standard discs included for comparison.
4 Ta foils wrapped around container
one spring at the back end to retain the graphite cartridge
One Ta cap with perforations at the front for T readings
initial heating at 2A/min to 50A, followed by heating at 1A/min to 90 A
Initial IGP1= 1.0e-6 Torr
OMEGA slope =0.990
Good and bad vacuum =5.0e-5 Torr and 5e-4 torr
Saturday, November 23, 2024, 11:20
autoramp start at 2A/min to 50A on tght
Saturday, November 23, 2024, 20:11
allowed pressure to drop to 3.3e-6 Torr after degassing.
Started ramp to 90A at 1A/min
Saturday, November 23, 2024, 23:46
started ramping at 1.5A/120s or 0.75A/min to 400A
Sunday, November 24, 2024, 07:55
Reached 1900 C at 410 A setpoint and 402 A on RD
Pressure did not increase after bumping up to 410 setpoint so will keep at this current until 11 am (four hours near 1900 C in total)
Sunday, November 24, 2024, 10:58
Final IGP1 at start of rampdown = 2.9e-6 Torr
Ramping down at -2A/min |
678
|
Wednesday, October 02, 2024, 19:24 |
Darwin Ortiz Rosales | TiC | | LP TUBE | Done | sintering TiC Experiment | Wednesday, October 02, 2024, 19:21
Ta endcup at front end of container
End-caps on the graphite cartridge have holes for outgassing.
initial heating @ 2A/min to 85 A then 2A/min to 120A TGHT. Allow pressure to drop and then ramp to 400 A at 2A/min, leave 4 hours and start ramp down.
OMEGA slope = 0.99
Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr
Max current~400A (1900 C)
Wednesday, October 02, 2024, 19:25
Starting IGP1 = 6.65e-06 Torr
Thursday, October 03, 2024, 05:09
Starting rampdown. Pressure stable at 4.5 e-06 Torr
Top temperature 1850 C on OMEGA
ramping down at -2A/min |
677
|
Tuesday, September 10, 2024, 13:16 |
Darwin Ortiz Rosales | Endcaps | | TARGET BOAT | Done | TaC coating sintering | A boat lined up with graphite and wrapped in 3 Ta heatshileds
Vacuum IGP1 initial =6.1 e-06 Torr
Target temperature on OMEGA= 1800-1900 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final TGHT current= ~400A (adjustable)
Heating autoramp started semi-manually on TGHT to 65A and then at continue to 100A
After peak heat at 1A/min to =400 A TGHT
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Tuesday, September 10, 2024, 22:22
1810C OMEGA at 439A TGHT readback |
676
|
Monday, September 09, 2024, 19:08 |
Darwin Ortiz Rosales | TaC | | LP-SIS | Done | TaC coating sintering LP-SIS with gas line | Monday, September 09, 2024, 19:06
The coated container was wrapped in 4 Ta foil heatshields.
Vacuum IGP1 initial =2.6 e-06 Torr
Target temperature on OMEGA= 1800-1900 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~400A (adjustable)
Heating autoramp starged at 1A/min on TGHT and TBHT until outgassin peak passed
Then at 1A/min to =400 A TGHT and 230A TBHT
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Monday, September 09, 2024, 19:08
Peak passed around 70A will continue ramp up at 1A/min to 400A on TGHT and 230A TBHT
Tuesday, September 10, 2024, 13:13
Was ramped down at -2 A/min TGHT and -1 A/min TBHT
|
675
|
Saturday, September 07, 2024, 09:55 |
Darwin Ortiz Rosales | TaC | 45447-13 | LP-SIS | Done | TaC coating sintering | Saturday, September 07, 2024, 09:54
The coated container was wrapped in 4 Ta foil heatshields.
Vacuum IGP1 initial =8.1 e-07 Torr
Target temperature on OMEGA= 1850-1900 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~400A (adjustable)
Heating ramp manually to 50A on TGHT and TBHT
Then at 1A/min to =400 A TGHT and 230A TBHT
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
Saturday, September 07, 2024, 17:38
At 400 A set point on TGHT, read back is 392A and OMEGA reads 1840C. TBHT set to 230A reads 233A.
It will be kept at this current for four hours before rampdown. |
674
|
Friday, August 30, 2024, 11:33 |
Darwin Ortiz Rosales | TaC | 45447-8 | LP-IG-LIS | Done | TaC coating sintering | Friday, August 30, 2024, 11:31
The coated container was wrapped in 4 Ta foil heatshields.
Vacuum IGP1 initial =3.1 e-07 Torr
Target temperature on OMEGA= 1850-1900 C
OMEGA slope:= 0.990
Target time at max temperature = 4 hours
Final Current TBHT= 230 A
Final TGHT current= ~400A (adjustable)
Heating autoramp starged at 1A/min on TGHT 100A and TBHT
Then at 1A/min to =400 A TGHT and 230A TBHT
Good vacuum = 5.0 e-04 Torr
Bad vacuum = 5.0E-02 Torr
note: Left TBHT hole is off from center by a good margin
Sunday, September 01, 2024, 07:32
Starting initial ramp at 1A/min to 50A
Sunday, September 01, 2024, 15:20
have ramped ;up at 1A/min on both TGHT and TBHT but had two issues.
1) Set current and readback current have discrepancies but the TBHT discrepancy is significant (TBHT Set at 188 while RD is 231.9 A @ 1.9V)
TGHT also has odd behavior with set point 405 giving 392A RD and 0.067V. Will hold until 430pm before starting ramp down
Sunday, September 01, 2024, 16:30
Started rampdown at -2A/min TGHT and -1A/min TBHT
Note: OMEGA not able to give any reasonable readings
Tuesday, September 03, 2024, 13:51
After troubleshooting EVAP2 it was found that a copper line was touching the metal encasement grid most likely resulting in a short. A short was seeing and it disappeared after moving the copper line away from the grid.
Upon restarting on epics the PS went to maximum current and it was shut off after 30seconds to a minute. The system was checked again by Arthur and TGHT was manually increased to 5A and then set to Zero again. Arthur thinks that the PS probably requires this step after switching from local controls to remote. Will start the sintering again as the container is coated but not sintered.
Tuesday, September 03, 2024, 14:03
ramping at 1A/min on both TGHT and TBHT to 90A.
Tuesday, September 03, 2024, 22:25
Started rampdown at -2A/min TGHT and -1A/min TBHT. HIgh temperature from OMEGA was 1825 C at 430A readback on TGHT. |
673
|
Monday, August 19, 2024, 13:17 |
John Wong | np-Ta | | TARGET BOAT | In progress | Carbonization of heat stabilized np-Ta fibres - 2nd Attempt | 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.
|
672
|
Wednesday, August 14, 2024, 16:24 |
Marla Cervantes | C | 44139-5 SK | LP TUBE | In progress | EVAP2 Calibration - Vanadium |
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
A vanadium wire was introduced in a tantalum pouch and snug among the graphite foils of a conditioned graphite target. The V wire was introduced in the Ta pouch to prevent the direct contact of the wire with the carbon and avoid the reaction between them.
As a first approach, the target will be heated to approximately 1377 °C, aiming at the vaporization temperature of the V wire. If the wire does not vaporize, heating with the turbo pump off would be considered to aim at the vanadium's melting point of 1910 °C.
|
|
Vaporization (at 3e-6 Torr)
|
|
|
|
In case of outgassing, let the pressure reduce
- 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
|
671
|
Wednesday, August 14, 2024, 16:22 |
Marla Cervantes | C | 44139-5 SK | LP TUBE | Problems resolved | EVAP2 Calibration - Vanadium |
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.
|
670
|
Wednesday, August 14, 2024, 07:23 |
Marla Cervantes | C | 44139-5 SK | LP TUBE | Problems | EVAP2 Calibration - Vanadium | 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 |
669
|
Thursday, August 08, 2024, 11:17 |
Marla Cervantes | C | 44139-5 SK | LP TUBE | Done | Graphite foils conditioning |
Aaron Schmidt wrote: |
Wednesday, August 07, 2024, 15:36: Roughing. Had initially been roughed & TP started w/ Marla CS, however it timed out. Restarting.
Wednesday, August 07, 2024, 15:37: TP on.
Wednesday, August 07, 2024, 15:46: Tripped at 4 KRPM. Restarted. Up to 5 KRPM.
Failed to start.
Thursday, August 08, 2024, 10:00: TP started.
Thursday, August 08, 2024, 10:12: TP Tripped but nearly spun up. Reset & Restarted. TP Green / on.
|
Thursday, August 08, 2024, 10:43
A cartridge was filled with graphite foils and loaded in an uncoated tantalum tube. The tube was wrapped with four Ta-sheets. A Ta-foil was placed in the tube's right end for measuring the temperature.
Green graphite target characteristics
Number of discs |
822 |
Mass of discs |
11.74 g |
Mass of loaded cartridge with normal cap and hole-cap |
31.1290 g |
Mass of tube loaded, w/shields and tantalum cap |
250 g |
Note: A cartridge loaded with graphite foils has not been conditioned before. Thus, there is no reference on what current to use to reach 2000 °C.
The conditioning of a graphite composite target will be used as a reference, but note that the graphite foils are not expected to outgas as the composites since the foils do not contain binders and plasticizers.
Reference: Elog 636 Graphite inside insert Experiment 2 (regular formulation discs)
Initial ramps used in elog 636:
Currently waiting for vacuum to reduce to IGP1= 8.2e-07
Thursday, August 08, 2024, 11:23
Slope: 0.98 (same as slope used for tantalum targets since temperature is measured on Ta foil)
Friday, August 09, 2024, 08:50
Good vacuum 3e-5 Torr
Bad vacuum 5e-5 Torr
Initial IGP1 = 5.06E-7 Torr
Starting ramp at 1A/min to 200 A
Friday, August 09, 2024, 09:40 Pressure started to rise, but temperature is not within pyrometer range yet. Current 42 A, Voltage 0.5 V
Friday, August 09, 2024, 10:46 Pressure started to reduce (peak 1.4e-5 Torr). Temperature is not within pyrometer range yet Current 100 A, Voltage 1.3 V
Friday, August 09, 2024, 11:28 Temperature started to be detected, but not stable enough. Current 135 A, Voltage 1.9 V
Friday, August 09, 2024, 12:54 Temperature 1129 °C, current 196 A, voltage 3 V.
Friday, August 09, 2024, 12:56
Next ramp 0.5A/min while taking temperature readings periodically until 250A
Friday, August 09, 2024, 14:45
IGP1 = 1.0e-6 Torr
Next ramp 1A/min to 480 A aiming at 2000 °C
Friday, August 09, 2024, 17:13
IGP1 = 1.9e-6 Torr, Current 327A, Voltage 5.3V
Ramp changed to 2A/min to 480 A aiming at 2000 °C
Coolded down after 4 hours at ~2000°C
at -2A/min |
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