Monday, September 14, 2015, 15:28
Green cast dried UO2/C + organic mass = 61.31g
The green was rolled up and wrapped in a piece of graphite sheet.
The Ta-target boat is wrapped with 3-layers of heat shield and installed in Evap1.
Chamber is NOT yet being pumped down due to the fume hood job in B2 level that will take place this week. Once the job is complete the UC2Flk process will begin.
Wednesday, September 16, 2015, 17:55
The work in the B2 level is done; the nuclear ventilation for the evaporators is now operational.
Tried to turn on the backing pump, but failed.
Submitted an fault #8428 to vacuum group
Thursday, September 17, 2015, 12:23
Vacuum group responded to the e-fault, and a new pump is installed.
Chamber is currently being pumped down.
Friday, September 18, 2015, 14:12
Chamber pressure is at 3.0e-6 Torr.
TGHT stepped up to 30A.
Target boat will be ramped up to 520A at the rate of 0.1A/min
Vacuum limit stop at 5.0e-5 Torr, backing off at 6.0e-5 Torr.
Friday, September 18, 2015, 16:05
Pressure stabilized at 3.6e-5 Torr.
Initiate autoramping
Monday, September 21, 2015, 11:38
TGHT was found tripped off at 50A on Saturday at about 6am; the backing pump gauge went up to 150mTorr at the same time (see attachment)
Note that a refurbished backing pump was installed before starting this process. It could be a leak somewhere; will let vacuum group to inspect this.
Monday, September 21, 2015, 15:34
Vacuum group took a look at the pump. It was the bleeding valve that was not properly close while the pump was installed. So after some period of running, the valve got loosen from the pump's vibration and caused the leak.
The pump is now back to operational.
Chamber is being pumped again. Once the vacuum is good, TGHT will be stepped up to 50A and autoramping will be initiated once it's ready.
Monday, September 21, 2015, 17:51
TGHT at 50A, IG at 3.6e-6 Torr.
Initiated autoramping.
Wednesday, September 30, 2015, 10:11
TGHT has reached to 520A/5.36V. The carbonization process is complete, vacuum at 3.29e-6 Torr, BP at 12mTorr. (see attachment#2)
Initiated auto-cooling at 2A/min.
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