Memo for Commissioning break (Mar. 2020)

• Summary result of the acoustic injection here

Priority of task

• Hammering test around REFL table
  • Understanding the noises which detected by the acoustic injection
  • Noise projection from chamber legs to DARM by vibrator
  • Move the accelerometers as you like
• Hammering test around POP table
  • Understanding the noises which detected by the acoustic injection
  • Prefer the PR2-BS duct hammering
• Hammering test of the cryochamber
  • If Tomaru-san or Ushiba-san help
• Set the accelerometer and vibrator to OMC chamber
  • With Miyoki-san

- Hammering test

Task list (Done)

• Hammering test of the OMC chamber (Done 22nd Feb.)

  • klog13105

  • There is excess in the sensitivity between 100 Hz to 400 Hz
  • Reported later, the main reason is the vibration to the OMC legs for the optical table inside the vacuum
• Hammering test AS table (Done 22nd Feb.)

  • klog13105

  • Reported later, the main reason is the vibration to the OMC legs for the optical table inside the vacuum
• Reflection light check (Done 22nd Feb.)

  • klog13105

  • Now we didn't use the AS PD signals for interferometer control
  • There was possibility that the reflection light from AS table make dirty scattering light
  • Shadowed between the OMC viewport and AS table, but we couldn't see the clear noise reduction
  • Also, when we added vibration to the OMC viewport, we couldn't detect the noise increasing.
• Hammering test SRM chamber (Done 22nd Feb.)

  • klog13105

  • The SRM mirror is misaligned. So We need to investigate the scattering light from SRM mirror
  • In this test, we can see the excess above 100 Hz
  • After this test, we cannot lock the interferometer. So if we have a time, we want to check again.

Task list (Partially done)

• Hammering test between PR2 and BS, PR2 side (Done 24th Feb.)

  • klog13138

  • PR2-BS duct give excess noise around 70-100 Hz
• Hammering test between PR2 and BS, PR2 side (Done 24th Feb.)

  • klog13138

  • PR2-BS duct give excess noise around 70-100 Hz
• Hammering test between BS and SR2, BS side (Done 24th Feb.)

  • klog13138

  • BS-SR2 duct give slight excess noise but not much
• Hammering test between BS and SR2, SR2 side (Done 24th Feb.)

  • klog13138

  • BS-SR2 duct give slight excess noise but not much
• Hammering test between SR2 and SR3, SR2 side (Done 24th Feb.)

  • klog13138

  • SR2-SR3 duct give broadband exces noise around 100-400 Hz
• Hammering test between SR2 and SR3, SR3 side (Done 24th Feb.)

  • klog13138

  • SR2-SR3 duct give broadband exces noise around 100-400 Hz
• Hammering test between SR3 and SRM, SR3 side (Done 24th Feb.)

  • klog13138

Task list (todo ; must items)

• Hammering test around BS chamber
  • Possible noise source 70-100Hz
  • Identification the noise path
    • From leg? From oplev? From duct?
  • Set accelerometer for feed-forward
• Hammering test of the PR2, PR3, PRM, IMMT2 chamber
  • We don't have any information from those chambers yet.
• Hammering test of the IMMT1 chamber
  • This chamber is including the ISS system
  • We performed the acoustic injection and identified the some noise peaks.
  • We placed the accelerometer on the leg of the IMMT1 chamber
  • Identification of the noise path
• Hammering test of the MCF chamber
  • We performed the acoustic injection and identified the some noise peaks.
  • We placed the accelerometer on the leg of the IMMT1 chamber
  • Identification of the noise path
• Hammering test of the cryochamber

  • Discussion

• Hammering test of the ducts
  • To check the scattered light effect, we want to perform the hammering test to the all ducts
  • We will ask Akutsu-san and Aso-san for the priority for following test
• Hammering test of the optical tables
  • (Must) IMC REFL table, REFL table, POP table
  • (Should) POS table, TMSX table, TMSY table

  • (If possible) OpLev tables, PCal tables

• Hammering test of the MCF-PSL tube

Task list (todo ; if possible)

• Hammering test of the IXA and IYA chamber
  • Non black coating materials
• Hammering test of the end station
  • EXC, EYC, EXA, EYA chambers
  • TMSX, TMSY chamber

- PEM injection

Task list (Done)

• Vibration injection to OMC legs

  • klog13152

  • We confirmed that the vibration of the OMC leg is under the sensitivity curve
• Acoustic injection to the PSL room(29th Feb.)
  • We couldn't find the any excess
• Acoustic injection to REFL table(29th Feb., 5th Mar. 7th Mar.)

  • klog13231, klog13338, klog13382

  • From klog13382, we can see the some excesses 100-600Hz

  • Washimi-san and TTanaka-san are analyzing data now.
• Acoustic injection to the POP table (11th Mar.)

  • klog13458

  • Large excess 320-400Hz (Related ISS? new noise candidate?)

Task list (todo ; must items)

• Vibration injection to legs of the chambers
  • After hammering test, we will investigate the environmental vibration may appear to the sensitivity or not
• Acoustic injection to the POP table

Task list (todo ; if possible)

• Acoustic injection to the cryochamber
• Magnetic injection

- Other task by PEM(?)

Task list (done)

Task list (todo)

• Check and remove the unused cables
• Clean up on the optical table
• Check and turn off the unnecessary instrument
• Turn off the some lights
• Clean up the experimental area
  • Clean environment may make the clean experiment