ELOG CARME

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

CARME

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Entry time:

Fri Oct 29 15:09:27 2021

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(Mon 25 October - Tue 26 October)

Considered different strategies to mount DSSDs inside CARME, while waiting for 2x new DSSD to arrive.

Plan A: Mount DSSDs on plate on the bench, slide plate on rod, then attach cables, then attach strain relief

Plan B: Mount DSSDs on plate, attach cables, attach strain relief, slide plate on rod, connect cables to feedthroughs

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Mounted detectors on plate using new &quot;dog leg&quot; connectors. Threaded and unthreaded holes are flipped! Asked DR to unthread hole in two out of four, and clean.

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Attempted to proceed with Plan B with stand-in broken detector. Found even a single wire harness attached to the detector was quite hard to insert in the chamber. Temporarily dismounted left-hand 2x UHV1400 to give more space.

Slid plate on rod. New position of rod block makes it easier to mount. Spraying ethanol on the rod to lubricate also helps greatly. Secured plate to rod. Holding flange with cables in left hand, attempted to mount macor plug in feedthrough with right hand. Unable to exert sufficient strength (CB, JM, OG). Pulling on the cable puts strain on the DSSD. Decided to avoid.

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Attempted Plan A. Jacked connector in with no issues using M6x40 partly threaded bolts. Unable to unjack due to part threads! Obtained fully threaded rods. Unjacked using washer + two nuts tightened on each other. Jacked and unjacked another connector.

Decided to proceed with A. Having any cable pre-mounted in the chamber is a potential hazard to the detectors while mounting plate. Decided to dismount all flanges, re-organise harnesses and mount one flange+harness at a time after mounting detector on rod.

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Used thick Kapton coated Cu from NEG pumps to organise the cables and improve strain relief.

Due to width of MACOR strain relief and nuts on the back of the MACOR plugs, realised strain relief cannot be mounted as intended. Asked DR to produce 90 x 30 x 3 mm extender plates instead. MACOR strain relief are 15 mm wide. Extender plate have 3x M4 unthreaded countersunk to fix to detector plate, 3x M4 threaded holes to hold MACOR strain relief.

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Organised cable harnesses.

4 short: all good -&gt; two to be mounted

2 long: all good -&gt; to be mounted

1 long: Broken MACOR backplate and lead. Lead removed. Attempted to mount with backplate in new lead - unable to do so. Removing backplate requires re-crimping. Will have to send back to Edinburgh

1 long: Wires cross in odd way. Will have to re-organise. Probably requires re-crimping. One pin smashed during jacking. Not sure if rescuable. See attached.

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