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Reports until 11:05, Wednesday 25 November 2020
H1 SUS (COC, SUS)
betsy.weaver@LIGO.ORG - posted 11:05, Wednesday 25 November 2020 (57378)
ITMY SUS disassembly

As Patrick recorded in his summary from yesterday, we have put the ITMY in the SAFE Guardian state and then removed many of the OSEMs.  So, ignore any error signals from th ITMY SUS.  (Recall the BSC1 HEPI and ISI are locked so those states are also now static.)  

Yesterday, Travis and I got so far as to lock all of the masses and muscling through the removal of most of the hardware on the QUAD needed in prep to remove the lower structure (and lowest 6) masses of the ITMY QUAD. We plan to do the deinstall with the arm on Monday.  We noted a fair amount of metal particulate on the bottom of our shoe covers each time we exited the chamber.

Prior to disassembly, Travis marched down to the ITMY Optical Lever receiving viewport and double checked our previous mapping.  Namely, with bias enabled for the main and reaction chain, the ITMY-HR beam is ~centered on the OPLEV diode (as confirmed by Kissel's trends yesterday) and the ITMY-AR overlaps the CP-HR very well.  I'll add the sketch soon.

Pictures attached are 1) ITMy pre-disassembly, 2) disassembly in process (ACB swung back, floor planks removed, sleeve removed) and 3) ITMy bit naked and ready for arm-assist removal.

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Displaying report 1-1 of 1.