This morning the pressure was 3.5E-7 T. Current at 275 A is 30nA.

Continue cathode heating to 290 A during meeting.

Start seeing some electron current from the cathode around 275 A.

start mass scan to do new mass calibration

mass spectrum saved as

plotdump-local-clean.txt_Jun29_12_14-55-43.txt

Friedhelm Ames wrote:

mass spectrum saved as plotdump-local-clean.txt_Jun29_12_14-55-43.txt

 new parameters for mass scan program after fit of mass scan

CONST11 = -4.13

CONST22 = 0.09595

purged Ne line and started cathode heater ramp up to 295 A

A short in the anode has developed during the heater ramp up. Increasing the current limit did not cure it. Start heater ramp down to investigate.

turbo pumps stopped to prepare for venting for anode short investigation.

Friedhelm Ames wrote:

turbo pumps stopped to prepare for venting for anode short investigation.

 Wednesday, July 04, 2012, 13:07: Water lines purged

Friedhelm Ames wrote:

A short in the anode has developed during the heater ramp up. Increasing the current limit did not cure it. Start heater ramp down to investigate.

 Wednesday, July 04, 2012: short found between anode and target. probably caused by the target tube coming in contact with the anode due to bending of the tube caused by heating and deformation of the grid retaining ring. see attachements

Replaced grid containing ring (target side) with new ring. No contact between target and anode measured in lab.

NOTE: While closing up the VCR fittings the tube rotated causing the tube to flatten in a bend. This may reduce water flow on the heat shield circuit. (see attachment)

Wednesday, July 04, 2012, 15:33: Started roughing.

Wednesday, July 04, 2012, 15:57 : Started turbos

Wednesday, July 04, 2012, 16:03: Turbos at speed. Vacuum at 3E-5

Anders Mjos wrote:

Replaced grid containing ring (target side) with new ring. No contact between target and anode measured in lab. NOTE: While closing up the VCR fittings the tube rotated causing the tube to flatten in a bend. This may reduce water flow on the heat shield circuit. (see attachment) Wednesday, July 04, 2012, 15:33: Started roughing. Wednesday, July 04, 2012, 15:57 : Started turbos Wednesday, July 04, 2012, 16:03: Turbos at speed. Vacuum at 3E-5

 Thursday, July 05, 2012, 08:39: Water supply open. Vacuum stable at 5.9E-7. Due to the kink in the heat shield cooling line, flow in the heat shield line is lower than other lines (visually inspecting speed of paddle wheels).

Found some water tripping in front of the high voltage power supplies rack from the water lines at the ceiling. Plastic sheets have been put on top of the racks and MCR has been informed.

tube heater ramping started

The current at the magnet power supply TMS:MB1 shows fluctuations every 1-2 minutes. The same can be seen in the Hall probe read back and in the beam current at Fc6.

Friedhelm Ames wrote:

The current at the magnet power supply TMS:MB1 shows fluctuations every 1-2 minutes. The same can be seen in the Hall probe read back and in the beam current at Fc6.

 a fault report has been issued to power supplies group. Dan Louie will look into it.

A big vacuum excursion tripped the source off at about 1am. The vacuum did not fully recover afterwards only down to about 1.3e-6T. Ne leak has been closed and vacuum went down to 6e-7T within a few minutes. After the trip the current of the magnet stayed constant. Fluctuations may have been caused by high voltage sparks.

heater ramping up again with Ne leak closed.

turbo pump TSG:TP1B has tripped off. Cannot be restarted. Fault report to vacuum. Everything switched off again