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PEM (EY)
tatsuki.washimi - 18:44 Sunday 22 March 2020 (13749) Print this report
Enviromental Noise Hunting @ Y-end

[Tomaru, Uchiyama, Ushiba, Washimi]@Y-end  + [Miyoki, Yokozawa]@Ctrl room

Today we did the enviromental noise Hunting at Y-end.

The results are here:

  • Turning off for EYA booth FFUs  -> No change
  • Hammering for this bellows (picture) -> 22-26Hz was excited  (plot1, plot2, plot3)
  • Hammering for the other ducts&bellows, EYA chamber, EYA chamber's legs, around duct shield coolers  -> No change
  • Acoustic injection into the TMSY booth ->  No change

 

Due to the unstability of IFO, we could not do the hemmering test for the cryostst.

Images attached to this report
Comments to this report:
tatsuki.washimi - 18:52 Sunday 22 March 2020 (13751) Print this report

When I injected a 200Hz sound into the TMSY booth, the peak was obsurved in CARM (not in DARM).

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tatsuki.washimi - 19:11 Sunday 22 March 2020 (13752) Print this report

Result of the 50-1000Hz white acoustic injection into TMSY booth.

 

Background : 1268897387 - 1268897417
Injected : 1268897468 - 1268897496
Main channel : K1:CAL-CS_PROC_C00_STRAIN_DBL_DQ
PEM channel : K1:PEM-MIC_TMSY_BOOTH_TMSY_Z_OUT_DQ

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yoichi.aso - 21:32 Sunday 22 March 2020 (13756) Print this report

Looks like the black curve is limited by PRCL/MICH coupling.

Can you use the noise curve with PRCL/MICH feedforward ?

tatsuki.washimi - 14:24 Monday 23 March 2020 (13774) Print this report

Sorry, we forgot to turn off the LEDs in Yend and the temperature and GAS filters are drifting.

I contacted to Furuta-san and he will go to turn off it today.

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