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Reports until 17:50, Monday 15 May 2017
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jenne.driggers@LIGO.ORG - posted 17:50, Monday 15 May 2017 (36197)
IMC not locking - not on IMC REFL PD?

[Vaishali, TJ, Jenne]

In order for Team TCS to work on their stuff, we wanted to get DRMI-related optics somewhat aligned.  Vaishali put all of the optics (including end stations) back to where their local sensors (OSEMs, or OpLevs if available) said they were on 7 May 2017.  This gives us good-looking IMC refl flashes, but the mode cleaner isn't locking.  Note that during this work, we have the IMC refl camera, but we're not seeing anything on MC trans camera.  Not sure why. 

I am not seeing peaks that look nice in either of the IMC trans PDs (IM1 trans or MC2 trans), even though the flashes on the refl camera look good.  Also, we're not seeing nice dips in IMC REFL DC when we get flashes.  We've run all of the Down guardian states, so everything should be set up the way we expect.  All of the settings that I can think of look fine.  We tweaked the input PZT and MC1 to get the WFS DC values back to that May 7th time, but I'm still not seeing normal-looking things on MC trans or MC refl PDs. 

I just don't think the IMC refl beam is hitting the REFL PD, or for some other reason we're not getting a valid PDH error signal for the mode cleaner. Never having been on the IOT2L table before, I don't want to start just before having to leave, so we'll come back to this tomorrow during maintenance, or whenever we can.

NB: TJ is leaving the LVEA in laser hazard.

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