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Message ID: 25     Entry time: Wednesday, January 23, 2013, 15:51
Author: Keith C Ng 
Category: Primary Beamlines 
Type: Repair 
Subject: 1A triplet repair (ground fault) 

Continued work on finding ground fault in 1A triplet magnets;

 

D. Preddy connected ohmeters to 1AQ14 & 15 power supplies with power leads disconnected. Ohmmeters were connected from magnet power leads to ground (pwr supply chassis).

- Q14 read 250 ohm and Q15 read 3 ohm.

- Disconnected power leads on Q14 and Q16 steering magnets. No change to ground faults.

 

Systematically moved wires off of magnets to find ground fault

- Moved north side asymmetric steering wire on live bus bars, no change

- Moved beam spill monitor (#57) cable, saw fluctuation in resistance on Q15.

- Moved disconnected thermocouple wire (from last year) on Q15, resistance change was observed.

- Moved thermocouple cable on coil #11, resistance change observed. No change on coil # 5.

- Resistance varied from 3 ohm to infinity.

 

Replaced RH bridge over Q15 shield block to facilitate re-installation of disconnected thermocouple.

- Removed RH bridge over Q15.

- Re-installed Q15 shield block.

- Re-installed 8' bridge over Q14 space.

- J. McKinnon reconnected thermocouple connectors & bound with Ø1/16" aluminum wire before covering. See photo.

20130123_tripletrepair_P1020666.JPG20130123_tripletrepair_P1020664.JPG

 

Q14 re-covered with shielding.

- Cover plate on Q14 replaced.

- No water was found on beam line floor.

  

1AQ14 shielding restored and two lead panels replaced to cover T2 monument. See photo.

 

20130123_tripletrepair_P1020669.JPG

 

Tomorrow:

- Uncover Q15 # 16 to find ground fault.

 

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