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Entry  Fri Jun 19 17:06:50 2020, gautam, Update, LSC, What should the short-term commissioning goals be? CARM_superBoost.pdf
    Reply  Wed Jun 24 17:20:16 2020, gautam, Update, LSC, What should the short-term commissioning goals be? 
       Reply  Tue Jun 30 10:59:16 2020, gautam, Update, LSC, Three sensing matrices PRMI_1f_20200625sensMat.pdfPRFPMI_20200629sensMat.pdfPRFPMI_20200629sensMat_wOffset.pdf
          Reply  Mon Jul 6 17:41:19 2020, gautam, Update, LSC, An LSC puzzler LSCsignals.jpg
Message ID: 15427     Entry time: Wed Jun 24 17:20:16 2020     In reply to: 15419     Reply to this: 15442
Author: gautam 
Type: Update 
Category: LSC 
Subject: What should the short-term commissioning goals be? 

Per the discussion at the meeting today, the plan of action is:

  1. Lock the PRMI on carrier and measure the sensing matrix, see if the MICH and PRCL signals look sensible in 1f and 3f photodiodes.
  2. Try locking CARM on POP55 (since there is currently no POP55 photodiode, can we use POX/POY as an intermediary?).
  3. For the ASC, can we hijack one of the IMC WFS heads to study what the AS port WFS signals would look like, and maybe close a feedback loop on the ETMs?
    • My guess is no, because currently, the L2A is so poorly tuned on MC2 that the CARM length control messes with the alignment of the IMC significantly.
    • So we need the IMC WFS loops to maintain the pointing.
    • Of course, the MC2 L2A can be tuned to mitigate this problem. 
    • I also believe there is something funky going on with the WFS heads. More to follow on that in a later elog.
    • Apart from these issues, for this scheme to be tested, some mods to the c1ioo model will have to be made so that we can route the servo output to the ETMs (as opposed to the IMC mirrors as is the usual case).

If I missed something, please add here.



I want some input about what the short-term (next two weeks) commissioning goals should be.

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