Wednesday, October 14, 2014

 The BIAS voltage was brought up between 1:30pm and 5pm. Sparks tripped the BIAS power supply at voltages between 20 - 24 kV. Multiple attempts were made. The current was about 50-60 uA.

Wednesday, October 15, 2014

Temperature in the cooling circuit is too hight to do a HV test. The cooling circuit was started, but shuts off after ~10 m

Thursday, October 16, 2014

David and I found that the fans on the cooling unit on the roof did not run and that the compressors get hot and likely trip on over temperature protection (hot to the touch). We found the manual in the control panel of the unit.

10am: HV to 20kV before a spark tripped the PS. Current at 40 uA - resistivity at 11.9 Mohm

5pm: HV to 20kV before fluctuations in current, then a spark tripped the PS. Current around 40 uA. Resistivity 12.6 Mohm

Friday, October 17, 2014

8am: Staging did not start over night. TS5 temp is 31 deg C, which would have tripped power supplies. Reset and enabled staging.
The system increased staging until all 3 compressors were running.
9am: Cooling supply temperature reached ~3 deg C. Disabled staging and switched off all pumps
2pm: Switched off water circulation for the weekend.