| Marla Cervantes wrote: |
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Friday, March 20, 2020, 19:39
The target material is loaded in a graphite cartridge.
The graphite cartridge is placed in a new tantalum boat previously without TaC,
the Ta boat was wrapped with three new Ta heat shields.
The system is currently pumping down.
Monday, March 23, 2020, 07:49
IGP1 = 2.2e-7 Torr
Good vacuum= 3.00 e-5 Torr
Bad vacuum = 5.00 e-5 Torr
Ramping TGHT to 40A at 0.5A/min
Monday, March 23, 2020, 10:35
Due to the COVID-19, non-essential activities are wrapped up,
the conditioning of the carbon target will be postponed until further notice
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Wednesday, May 20, 2020, 12:50
On May 19 the pumps of EVAP2 were turned on to purge the system
Today Aaron made a leak check, for details, visit elog-481
Currently IGP1 = 8.17e-7 Torr
Thursday, May 21, 2020, 09:41
IGP1 = 4.5e-7 Torr
TGHT = 0.03 V, 0.028 A
Current will be increased manually to 10 A, and then it will be autoramp to 500 A
Whit this power supply the current increments are register since the beging
TGHT = 0.145 V, 10.35 A
During the input of the 10 A there was no anomaly with the pressure and the autoramp was set to 50A:
1 A each 10 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr
Thursday, May 21, 2020, 10:39
The autoramp reached the 50 A set
TGHT = 0.65 V, 49.05 A
Power supply = 0.64 V, 50 A
IGP1 = 4.7e-7 Torr
Everything looks good, autoramp is set to 80 A same conditions
1 A each 10 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr
Thursday, May 21, 2020, 10:49
The autoramp reached the 80 A set
TGHT = 1.075 V, 79.36 A
Power supply = 1.07 V, 80 A
IGP1 = 1.7e-6 Torr and increasing
Autoramp is set to 100 A,conditions:
1 A each 20 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr
There was a jump in the vacuum e-log-482-fig-1.
Thursday, May 21, 2020, 11:01
The autoramp reached the 100 A set
TGHT = 1.4V, 99.9 A
Power supply = 1.4V, 100 A
IGP1 = 0.001 Torr and increasing
Autoramp is set to 120 A,conditions:
1 A each 20 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr
Thursday, May 21, 2020, 11:12
TGHT = 1.75 V, 120.6 A
Power supply = 1.74 V, 120 A
IGP1 = 0.0018 Torr
The current will be hold and to let the vacuum reduce
Thursday, May 21, 2020, 11:34
TGHT = 1.8 V, 120.825 A
Power supply = 1.74 V, 120 A
IGP1 = 9.8e-5 Torr
Thursday, May 21, 2020, 11:37
Autoramp is set to 300 A,conditions:
2 A each 10 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr
Thursday, May 21, 2020, 12:21
TGHT = 5.015 V, 298.125 A
Power supply = 5 V, 300 A
IGP1 = 4.77e-5 Torr
Omega = 1130 degC
Note: Measurments will be taken with ARIEL's pyrometer (I will call it AP in this elog).
The emmisivity this pyrometer accounts for is 0.91 for the range of 1000 C to 1800 C
Above 01800 it will use 0.93 as the emissivity
AP = 977.7 degC
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