aLIGO LHO Logbook

LHO VE

travis.sadecki@LIGO.ORG - posted 16:12, Tuesday 28 April 2026 - last comment - 16:37, Wednesday 29 April 2026(90042)

HAM3 D3 feedthru swapped

The D3 feedthru on HAM3 was swapped from the 3-port version with 3x Dual DB25 feedthrus to the single piece 12x DB25 connector feedthru. We re-attached the in-vac cables that were originally in that port and Betsy re-attached the in-air cables so that the SUSes can be controlled overnight.

Comments related to this report

betsy.weaver@LIGO.ORG - 08:09, Wednesday 29 April 2026 (90050)

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Cables were unplugged on both the vac and air sides, so keeping track was a bit tedious.  I have started an AS-BUILT cheatsheet which tracks the serial numbers as we go on the main LHO HAM3 Flange Layout DCC page https://dcc.ligo.org/D1002874-v10, see the google doc.  Attached is a snapshot of the sheet with the D3 work logged so far.  
TBC...

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D1002874-v10LHOAs-BuiltApril2026.pdf

betsy.weaver@LIGO.ORG - 16:37, Wednesday 29 April 2026 (90061)

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Note, for the 24hours that this feedthru work and recabling was happening, I turned off the chassis that powers this ISC/IO_245 cable to POPA/POPB at the transimpedence amp  SLot U25 of the ISC_R4 rack near the PSL (Thanks Kissel for the consult to get me there).  Per Fil, the picomotors had already been "turned off" when their plug in was disconnected at the ISCT2 picomotor "box", so I didn't do anything for that one.