Thursday, May 17, 2012, 13:15

After the test-stand, the EE was removed for inspection.  It was discovered that there were some solid residues coated on the extraction electrode and the common plate, but the ionizer tube was clean (see attachment#1).  Some samples were collected and will try to do some analysis.  This problem has been seen before but it's still not clear why the solid residues form after the test-stand.  

The EE & the common plate were cleaned with acetone and re-assembled back to the target.  

 A crack in the insulator ITD0054 was observed while mounting the target assembly. See attachment.

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

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.

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 new turbo has been installed. Eddie said the other one had crashed but not catastrophically. He recommends the test stand be wiped clean before pumping because there is a fine layer of Aluminum dust on the chamber base.

Wednesday, July 11, 2012, 15:27: Started TSGTP1A and 1B

Wednesday, July 11, 2012, 15:31: Started TSMTP2 and 6

Wednesday, July 11, 2012, 15:33: TMS tubos at speed. Vacuum 4.8E-7

Wednesday, July 11, 2012, 15:34: TSG turbos at speed. Vacuum 9.5E-6

Shut down TSGTP1A due to noise (possibly from bearings) after consulting Edi.

Aluminum oxide found inside TSHSV1 and the copper line to TSHUHV1.

SV1 replaced and copper line cleaned.

Leak found on the Ne supply line. 1E-4 - 1E-5 range. Replaced fittings. Had to use one brass piece. Leak rate 6E-9 (probably due to Ne response). No response to He.

Leak rate around low E-8 with regulation valve open.

When closing the HV rack, an air supply leak developed on the manifold for the valves. Shut off air supply. Valves still operational, but requires opening up air supply to actuate.

Anders Mjos wrote:

Leak found on the Ne supply line. 1E-4 - 1E-5 range. Replaced fittings. Had to use one brass piece. Leak rate 6E-9 (probably due to Ne response). No response to He. Leak rate around low E-8 with regulation valve open. When closing the HV rack, an air supply leak developed on the manifold for the valves. Shut off air supply. Valves still operational, but requires opening up air supply to actuate.

 With the help of Rick, the leak was fixed.

The vacuum pump for the gas lines was removed for repairing the leaking hose.

Due to high vacuum a leak check will be done on the system.

Thursday, July 19, 2012, 09:00 : Base leak rate 4E-9 atm-cc/sec

Thursday, July 19, 2012, 09:07: Leak detected on side door. Mid 1E-8 range.

Thursday, July 19, 2012, 09:08: Leak detected on front door. Mid 1E-6 range. Main leak left or bottom side.

Thursday, July 19, 2012, 09:20: Leak on side door could not be reproduced. Previous response possibly due to  "cross-talk" with front door.

Anders Mjos wrote:

Due to high vacuum a leak check will be done on the system. Thursday, July 19, 2012, 09:00 : Base leak rate 4E-9 atm-cc/sec Thursday, July 19, 2012, 09:07: Leak detected on side door. Mid 1E-8 range. Thursday, July 19, 2012, 09:08: Leak detected on front door. Mid 1E-6 range. Main leak left or bottom side. Thursday, July 19, 2012, 09:20: Leak on side door could not be reproduced. Previous response possibly due to  "cross-talk" with front door.

 Thursday, July 19, 2012, 11:29: Wiped both o-rings, grooves and sealing faces with kimwipes. Removed black and brown residues.

Thursday, July 19, 2012, 12:57: Doors leak checked. No response. Base rate 1.6E-8 atm-cc/sec. TP pressuer 0.0E-4 Torr . TSGIG1 4.2E-6 Torr. TSG:CG1A 0.014 Torr.

A major leak was found on the connection to the regulation valve on the He bottle. Ferrule replaced. System leak checked.

After He bottle: base 5E-6, no response to He spray

AfterSV1: base 5E-7, no response

After SV2: base 4E-7, no response

The system should now be operational. Gas lines were evacuated with the leak checker.

Archivers not running this morning. Started both ISACT and SOURCES