aLIGO LHO Logbook

LHO VE (DetChar, VE)

travis.sadecki@LIGO.ORG - posted 11:50, Wednesday 13 August 2025 - last comment - 10:16, Thursday 28 August 2025(86345)

BTRP adapter flange and GV installed at MY

Similar to alog 86227, the BTRP adapter flange and GV were installed on Tuesday at the MY station. Leak checking was completed today with no signal seen above the ~e-12 torrL/s background of the leak detector.

Pumping on this volume will continue until next Tuesday, so some additional noise may be seen by DetChar. This volume is valved out of the main volume, so the pressure readings from the PT-243 gauges can be ignored until further notice.

Comments related to this report

anna.iudintseva@LIGO.ORG - 14:04, Wednesday 13 August 2025 (86351)

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Here are the first and the last pictures of the leak detector values.
The max was 3.5 * 10-12. 90% of the time it stayed at <1 *10-12.

Images attached to this comment

travis.sadecki@LIGO.ORG - 13:30, Tuesday 19 August 2025 (86453)

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As of Tuesday, August 19, the pumps have been shut off and removed from this system, and the gauge tree valved back in to the main volume. Noise/vibration and pressure monitoring at MY should be back to nominal.

janos.csizmazia@LIGO.ORG - 15:33, Tuesday 19 August 2025 (86462)

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The pumping cart was switched off, and the dead volume was valved back in to the main volume. The pressure dropped rapidly to ~5E-9 within a few minutes, and it continues to drop.

Also, we (Travis & Janos) added some more parts (an 8" CF to 6" CF tee; CF to ISO adapters, and an ISO valve) to the assembly, and also added a Unistrut support to the tee; see attached photo. Next step is to add the booster pump itself, and anchor it to the ground.

Images attached to this comment

janos.csizmazia@LIGO.ORG - 08:27, Thursday 28 August 2025 (86606)

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LOTO was applied now both to the handlers of the hand angle valve and the hand Gate Valve.

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