Reports until 14:19, Thursday 25 April 2024
H1 ISC
camilla.compton@LIGO.ORG - posted 14:19, Thursday 25 April 2024 - last comment - 12:16, Wednesday 01 May 2024(77420)
LSC FF Meassuremnts taken with ITMY L2 L2L DRIVEALIGN LP filter off.

In  77236, Gabriele found the ETMY L2 DRIVEALIGN L2L filter bank has a "L2L3LP" engaged that might be making it harder for us to fit the LSC FF. Today we re-measured the LSC FF, not interatively, with both FF's off and the "L2L3LP" filter off.

Nothing changed but we hope to refit the feedforward and implement them later. When installed, we would need to turn "L2L3LP" filter off after the ISC_LOCK states have been transitioned back to ETMX (77240).

  1. ISC_LOCK to NLN_CAL_MEAS
  2. Turned off both MICH and SRCL FF.
  3. Measured MICH_excitation.xml and SRCL_excitation.xml (used half the nominal exc amplitudes as the FF's were off, saved with full exc amp)
  4. Turned off ETMY L2_L2L_DRIVEALIGN L2L3LP filter, see 77236
  5. Set up for FF injections, see readme. (turn off F filter and input, but turn on filter to allow excitation though)
  6. Measure NoLP_MICHFF_excitation_ETMYpum.xml and NoLP_SRCLFF_excitation_ETMYpum.xml (have adjusted exc shape for L2L3LP being off, used half nominal amplitude)
  7. Undo set-up for FF injections, see readme. Keep FF's off as L2L3LP filter's still off.
  8. Turn on L2 L2L3LP filter
  9. Turn on both MICH and SRCL FF.
  10. ISC_LOCK to NLN

All code saved to /opt/rtcds/userapps/release/lsc/h1/scripts/feedforward/

Comments related to this report
camilla.compton@LIGO.ORG - 17:28, Thursday 25 April 2024 (77431)
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Struggling to fit these.

I have a MICHFF (pasted below) that's a factor of 10 worse than usual (plot attached). We may need to try to put this in and measure iterativly next week.

zpk([-6.816742648521258+i*81.77990170298034;-6.816742648521258-i*81.77990170298034;-77.88634028587184+i*89.33349468557826;-77.88634028587184-i*89.33349468557826;-718.113182677264+i*694.9426298748548;-718.113182677264-i*694.9426298748548;900.2096672125509+i*1208.040185682559;900.2096672125509-i*1208.040185682559;44.6571105273674;-170.8240187509259;-448.0004789051675;-596.150964242976],[-7.116688087177324+i*81.29900739837851;-7.116688087177324-i*81.29900739837851;-310.9419719288208+i*548.6326527169308;-310.9419719288208-i*548.6326527169308;-27.13254150394529;-30.48270823801881;-135.6924431195733;-151.8787517615438;-191.3877206479833;-2313.589507955138;-2602.376933025248;-2783.911401801387],-3.94153891134724)

Somethings wrong with the SRCL data I  exported (even after re-exporting), plot attached. Data prepared using NotItter_LSC_FF_PrepareData.ipynb

Images attached to this comment
camilla.compton@LIGO.ORG - 12:16, Wednesday 01 May 2024 (77546)
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Gabriele found that the SRCL data was fine if (DELTA_L / SRCLFF_IN2) was exported but that the SRCLFF was even harder to fit than previously. We have taken TFs in 77542 to try to understand why.