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Thursday, October 11, 2018, 18:06
Target consists of 284 UCx discs, total packing length of 8.0 cm.
Container was previously coated/sintered with TaC (see elog #417) in Evap#2 with TGHT set to 400A and TBHT 230A, but there was a problem with the readback. Will ramp up TGHT to 400A to see if the carbonization is complete; if not, additional 50A on TGHT can be applied.
One end-cap is inserted on the right, wrt to the ionizer, and left end is open.
Vacuum initial setting:
Good Vac = 5.0 e-5 Torr, Bad vac = 8.0 e-5 Torr.
pressure level will be monitored accordingly...
Auto-ramping setting
TGHT: 60 wait time, 0.2A/min, final 400A (or addtional of 50 A if required as mentioned above)
TGHT: 60 wait time, 0.2A/min, final 230A.
Chamber is currently being pumped down.
Friday, October 12, 2018, 15:35
Chamber has pumped down to 1.8e-6 Torr.
Stepping up TGHT and TBHT to 40A.
Friday, October 12, 2018, 17:07
TGHT/TBTH was held at 40A reaching max pressure of 1.7e-5 before slowly coming down.
Initiated autoramping.
Thursday, October 18, 2018, 11:10
TGHT reached to 400A/3.98V, pressure is coming down from the upper limit at around 320A which indicated the carbonization is approaching to completion (see attachment#1). However, two more out-gassing steps are typically observed as TGHT reached around 450 A (see previous UCx conditioning process). Currently the pressure is at 1.04 e-5 torr.
Auto-ramping TGHT to 450A at 1A/min, continue to observe the vacuum...
Thursday, October 18, 2018, 12:57
TGHT reached to 450A/4.6V. Pressure is coming down from 1.6 e-5 Torr. (see attachment#2). Will remain at this heating current until pressure reached to mid 10-6 torr.
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