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Reports until 10:57, Tuesday 30 May 2017
H1 TCS
nutsinee.kijbunchoo@LIGO.ORG - posted 10:57, Tuesday 30 May 2017 - last comment - 13:34, Tuesday 30 May 2017(36516)
CR HWS end testmass reflection test

TJ, Nutsinee

Per Aidan's request we misaligned ITMs and moved ETMs around to see if the CR HWS sees any reflection from the ETM surface. HWSY streamed images didn't appear to have any residuals from the ETMY but HWSX saw some light from the ETMX.

Here's HWSX with only ITMX misaligned (ITMX delta YAW = -191.3u)

And here's HWSX with both ITMX and ETMX misaligned (ETMX delta YAW = -110.5u)

 

We also appeared to have this mesh-looking feature on the left hand side. Stray light?

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nutsinee.kijbunchoo@LIGO.ORG - 12:17, Tuesday 30 May 2017 (36520)
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TJ, Nutsinee

We went in and move top+bottom periscope to get ride of the reflection. Here's what it looks like now:

 

HWSX with ETM

 

HWSX without ETM

 

HWSX with ETM and ITM

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aidan.brooks@LIGO.ORG - 13:18, Tuesday 30 May 2017 (36521)
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Alignment looks good. How much did you guys have to move these mirrors?

nutsinee.kijbunchoo@LIGO.ORG - 13:34, Tuesday 30 May 2017 (36522)
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I moved the top periscope at least one whole turn (probably something like 1 turn and a half) to get rid of the dim shape of the test mass. Then I moved the bottom periscope to bring back the return SLED beam.

The Hartmann plates are back on and the codes are running.

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