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Monday, October 28, 2019, 10:29
A loaded graphite cartridge was set in a tantalum boated and wrapped with 3 tantalum sheets
The set up was installed in the EVAP1 and pumped dwon during the weekend.
IGP1 = 1.10 e-6 Torr
Monday, October 28, 2019, 10:31
Good vacuum = 1e-1 Torr
Bad vaccum = 5e-1 Torr
The current ramp is 1 A each 10 s from 0 A to 100 A
Monday, October 28, 2019, 11:13
After 18 min the pressure started dropped.
Monday, October 28, 2019, 11:22
When the pressure reduced to 5e-4 Torr the current ramp was changed to 3.3 A each 10 s to 480 A, the vacuum limits stayed the same.
Monday, October 28, 2019, 11:45
The limit was set to 500 A with same ramp
Monday, October 28, 2019, 11:48
The ramp was changed to 1A/10s to 550 A
Monday, October 28, 2019, 11:55
At 520 A the pressure reach 1e-1 Torr and the autoramp stopped
Monday, October 28, 2019, 13:39
the current was increased manually at aprox. 1A/30 s
The current dropped suddenly even though the pressure was under the limits and the ramping was in the limits.
Autoramp was set to 3 A/ 10 s from to to 500 A
Then it was changed to 1 A /30s from 500 to 506 A
Finally it was changed to 1 A/ 10 s from 506 to 520 A
Manually tapped to 530 A
Monday, October 28, 2019, 15:40
At 13:45 the current reached 530 A.
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