aLIGO LHO Logbook

LHO VE

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chandra.romel@LIGO.ORG - posted 17:06, Wednesday 04 April 2018 - last comment - 19:12, Thursday 05 April 2018(41296)

Vacuum summary for the day

Gerardo, Mark D. Tyler, Chandra

Corner

Torqued IP5 studs metal on metal
Got XBM & YBM on turbos/scrolls and leak checked:
- IP6 valve (beam tube side) and PT-170 gauge with background at 3.1e-9 Torr-L/s (there will be no IP6 installed here until rebuilt unit ships from vendor in May)
- IP5 + valve with background at 2.0e-9 Torr-L/s. We had some troubles pumping down IP5 with pump carts. The little red "cube" kept tripping, even with a 'hung' turbo. The trusty old pump cart survived the long wait through ~10 Torr. We thought we had a big air leak somewhere, but all checked out. IP5 isolation gate valve was left open to pump down with main YBM volume
- New GV on XBM turbo is leak tight with background at 3.3e-9 Torr-L/s
Vented vertex
Loosened bolts on IP3 to prepare for R&R tomorrow (no, not that kind of R&R). Left its isolation GV open
Loosened HAM5 doors bolts

Torqued IP11 stack studs metal to metal
Installed BSC10 door and successfully pumped down annulus (i.e. no leaks)
Turned on QDP80 to warm up
Purge air scroll #4 is loud, so we turned it off for now. Might be a bad one-way valve
Connected charged battery pack for turbo

We will start roughing down EY tomorrow.

Comments related to this report

chandra.romel@LIGO.ORG - 17:22, Wednesday 04 April 2018 (41297)

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Checked on CP4 at MY.

gerardo.moreno@LIGO.ORG - 17:49, Wednesday 04 April 2018 (41299)VE

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We have an aux cart running at Y-End right next to the BRS, it will be there until pressure at the BSC10 annulus system is kept at nominal by its ion pump.

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jeffrey.kissel@LIGO.ORG - 08:00, Thursday 05 April 2018 (41301)CDS, ISC, SYS

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Prior to corner station vent, high voltage has been turned off (as per items mentioned in M1300464).
    - ESD driver
    - Fast shutter de-energized
    - OMC's PZT actuator drive
    - Picomotors
ITM Ring heater's measured power is zero (power is off at chassis), and I've changed the requested power to zero via MEDM.

kyle.ryan@LIGO.ORG - 19:12, Thursday 05 April 2018 (41318)

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The net pump speed of this diaphragm backing pump is "much" less than what we are used to. I used this portable pump station for the first time the other day to evacuate 4 lengths of 1.5" flex line + the volume between IP6's closed GV and the zero-length reducer and it took "minutes" not seconds.