= Memo for Commissioning break (Mar. 2020) = * Summary result of the acoustic injection [[KAGRA/Subgroups/PEM/MAR2020/Acoustic_result| here]] == Task list (ToDo) at the 21st and 22nd March. == * Hammering test to the C-chamber, A-chamber and TMS-chamber * Y-end (21st morning) group 1 * Y-front (21st morning) group 1 * X-end (21st afternoon) group 1 * X-front (21st afternoon) group1 * Gate valve investigation * Oepn-close (21st morning) group 2 * Hammering with low frequency (21st morning, if possible) group 2 * Search the 4 Hz glitch * (21st morning) group 2 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13703|klog13703]] * Suspect point : BS magnetometer and Y-green * Using the magnetometer placed in front of the BS cooler, we will search the glitch origin during hammering test by group 1 == Priority of task == * Hammering test of the cryochamber * If Tomaru-san or Ushiba-san help == - Hammering test == === Task list (Done) === * Hammering test of the OMC chamber (Done 22nd Feb.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13105|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.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13105|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.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13105|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.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13105|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. * Hammering test between PR2 and BS, PR2 side (Done 24th Feb.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13138|klog13138]] * PR2-BS duct give excess noise around 70-100 Hz * Hammering test between PR2 and BS, PR2 side (Done 24th Feb.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13138|klog13138]] * PR2-BS duct give excess noise around 70-100 Hz * Hammering test between BS and SR2, BS side (Done 24th Feb.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13138|klog13138]] * BS-SR2 duct give slight excess noise but not much * Hammering test between BS and SR2, SR2 side (Done 24th Feb.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13138|klog13138]] * BS-SR2 duct give slight excess noise but not much * Hammering test between SR2 and SR3, SR2 side (Done 24th Feb.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13138|klog13138]] * SR2-SR3 duct give broadband exces noise around 100-400 Hz * Hammering test between SR2 and SR3, SR3 side (Done 24th Feb.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13138|klog13138]] * SR2-SR3 duct give broadband exces noise around 100-400 Hz * Hammering test between SR3 and SRM, SR3 side (Done 24th Feb.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13138|klog13138]] * Hammering test around BS chamber * When hammering the bellows between PR2 and BS, 70-100Hz was excited. Scattered noise? * It seems from duct * Set accelerometer for feed-forward * But, we couldn't see in the spectrum of the portable ACC. * Hammering test of the PR2, PR3, PRM, IMMT2 chamber * Finally, we found that vibration around the IMC gate valve is the path to DARM displacement. * Most suspect noise path is scattered light from AR MCO reflected around gate valve and back to main laser. * Reducing the vibration. * 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 * No significant result was obtained * 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 * We had several noise increasing, Washimi-san investigate now. * We also do hammering test to the PSL window * Hammering test of the optical tables * (Must) IMC REFL table, REFL table, POP table, ISS table * (Should) POS table * (If possible) OpLev tables (PR area) * We can find 500Hz noise may come from the REFL table === Task list (todo ; must items) === * Hammering test of the TMS chambers * Including the gate valve === Task list (todo ; if possible) === * Hammering test of the cryochamber * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/PEM/Meeting/200121/Minute|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 * (Should) TMSX table, TMSY table * (If possible) PCal tables * 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 == [[KAGRA/Subgroups/PEM/PEMinjection/O3|Summary of PEM injection dataset with PRFPMI]] === Task list (Done) === * Vibration injection to OMC legs * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13152|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.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13231|klog13231]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13338|klog13338]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13382|klog13382]] * From [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13382|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.) * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13458|klog13458]] * Large excess 320-400Hz (Related ISS? new noise candidate?) * Acoustic injection to the cryochamber * Done to IXC. Effect would be small. === Task list (todo ; must items) === * Vibration injection to legs of the chambers * We did for MCF and IMM legs, but we can ignore the vibration * We set the oscillator and accelerometer to OMC leg again === Task list (todo ; if possible) === * 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