== Minute of PEM meeting (English ver.) == * Date: 2019/11/05 17:00-18:00(JST) * Attend：Yokozaqwa, TNTanaka, Fujikawa, Ohkawa, Washimi, Mori, Kozakai, Yamada, Akutsu, Kaihotsu === Agenda === 　 * General issue * Interferometer status * Now, we can lock the interferometer stably * ISS(Intensity Stabilization System) was implemented, better sensitivity * Long silent run at 2nd Nobember ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=11312|klog11312]]) * See the detail in [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/DET/RUN/MORNINGRUN2019|url]] * Silent run -> Some excitation(including calibration line) -> PEM injection -> Hardware injection * PTEP paper * [kagra 03133] * KAGRA Overview papers * Overview of KAGRA : (3) Detchar, calibration, physical environment, data quality * Next F2F meeting * RESCEU * 4th and 5th Dec., 2019 * 1 slot Washimi-san will have a talk * If you plan to write master/doctor thesis, please let me know * Master thesis : TTanaka(ICRR) * Chrome Book project (Portable PEM researcher) * http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/PEM/Portable * We prepared two PEM Chromebook * Start writing paper (PTEP?) * PEM injection * Shaker injection1 (TTanaka, Yokozawa) * Shaker injection2 (Okutomi, Fabian) -> After O3 * acoustic injection (TTanaka, Yokozawa) * magnetic field injection (Niigata Tanaka, Fujikawa, Yokozawa) * RF injection (TTanaka, Washimi) -> After O3 * Weekly PEM measurement * Friday is weekly PEM measurement * Understanding the effect of the instruments, search the origin of noise, and so on * Tentative : New vacuum pump, 18V DC noise(24Hz), Cryochamber vibration(46Hz), FFU, Noise search * Database for the KAGRA characteristic lines * [[https://www.icrr.u-tokyo.ac.jp/~yokozawa/KAGRA_line_database/index.html|url]] * NoEMi * Visitors from LVK * Anamaria from Livingston : 18 - 29 Nov. * Federico, Irene, Camilla (input optics) + Francesca from Virgo : 11/18-12/7 (2 weeks@KAGRA, 1 weeks@NAOJ) * We will ask them about the status talk of the commissioning break and reviewer * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/PEM/Meeting/191126/Agenda|LVK PEM meeting (11/26)]] * Fujikawa, TNTanaka 11/24-12/3 * Each progress * Yokozawa * Current serious noises * 24Hz noise (100V AC + AA?) * We connect/disconnect the GND JP in the AA chassis, but could not understand * MICH control noise * Add the noise projection of the MICH control noise * Coherent with ITMX MN YAW * Wait for the noise budget of the Type-A control * Coherence with ITMY TM PIT * Wait for the noise budget of the Type-A control * Daily summary page * Update PEM, VIS, FPMI part * Washimi * Summary of coherence study between PEMs and DARM displacement * Calculated the coherence between DARM displacement and PEM channels for long locked data (>1h, 500average) * We can see the coherence between DARM and EXC MAG Y at 11Hz, but we couldn't see peak when he went to end station, coincidence with LOCK status? * Coherence with PCal RxPD at 1.3Hz, ETMY gas excitation made the large oscillation, Pcal detected as long oplev * 24Hz is serious rack noise * 44,45Hz Compressor or FFU? * Compressor sound make44Hz, 46Hz and 56Hz -> stop during observation, check the coherence with FPMI signal * The 60Hz peak of the EXC MAG is larger than other MAG, this imply the dark GND at Xend station * It turned out acoustic noise search inside the PSL is difficult, we prepared the multiple microphone and see the data at the same time. * laser amp made the ~110Hz vibration and injected to the noise, similar path with 24V power supply vibration(white rack) * 840Hz IMC refl * We need to classify the Priority to the noises, it is different between identification and hunting * Washimi, Yamada, TTanaka * IXC vibration -> See the Yamada-san's slide * Identify the origin of the frequency noise * 42Hz is resonant frequency of the pylon * 44Hz Whimsical compressor -> checked by them * 46.125Hz * 54.125Hz Whimsical compressor -> checked by them * 58 sound origin? * Some peaks were grow up by the acoustic injection, due to the scattered light? * There is data which can take coherence between DARM and accelerometers which were placed in the IXC chamber * There is some coherence between DARM and MIC at center area, there is no coherence with end mic * There is coherence with ITMX MN P <20Hz * There is coherence at 46Hz between DARM and ACC at the TM oplev table, this is some hint for 46Hz noise * Also MIC at 46Hz * We want to check the condition with various air compressor * Kozakai * Trigger analysis with silent run * Auto process was run when we can take the silent run, the glitch plots were generated for the long silent run, please check the Yuzu summary page * [[https://www.icrr.u-tokyo.ac.jp/~yuzu/bKAGRA_summary/html/20191103_GlitchPlot.html|example]] * glitch plot catalog * There is coincidence between large glitch and magnetometers and/or seismometers, suspension jump. * Fabian requested that there is coincidence between OL jump and glitch -> check later * TTanaka(ICRR), Washimi, TTanaka(Niigata), Yamada * Acoustic injection with FPMI * No report in this meeting * Mori, Nakayama * Vacuum pump vibration * They stopped six vacuum pump(dry、turbo) at the center area(BS) at last Friday, they didn't stop the ion pumps, ion pumps will not be stopped during observation. * Compared the vibration between turbo pump on and off * Pressure value became twice worse, but there is no serious problem, this imply the outer gas is not so large * New low vibration vacuum pump characterization * They summarized the vibration and sound from the vacuum pumps * The behavior of the noise floor at 200Hz is interested、the floor in case of the OFF is larger than in case of the ON, 214Hz and 216Hz * Fujikawa, Mori * fujimopy * Peak identification for the two cases (ex: pump on/off) * Average is important to reduce the statistical error * Available from the diaggui * html viewpage in the ICRR computer : change 40-50Hz to 7-11Hz? * Line amplitude web page * Fujikawa, Washimi * Lock loss study * root histogram-> gauss fitting and check the significance->Easy identification of the lock loss * Lock loss due to the IXC acoustic injection->pulse like injection or excitation? * Stat the investigation for the lock loss of the FPMI * TTanaka(Niigata) * Preparation of the coil * 24Hz noise situation * Made the coil driver for the PEM injection * Discussed about his thesis and MAG injection * etc