[[KAGRA/Commissioning/CommissioningWorkshop2017|Back to CommissioningWorkshop2017]] = IMC Information = * Current IMC servo topology: * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=7105 * Common mode servo board configuration: * SLOW ('''K1:IMC-SERVO_SLOW_CON_IN1''') goes to AOM (and IMC length) * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3190 * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3544 * IMC sideband frequency: 13.78 MHz * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=5493 * Measured IMC modulation depth: ~0.1 rad * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3709 * Measured IMC finesse: 540 +/- 70 (NOTE: 458 from cavity pole, not klogged) * http://klog.icrr.u-tokyo.ac.jp/osl/?r=618 * Measured IMC round-trip length: 53.3 m (Could be slightly different right now since we had re-installation work after this measurement) * http://klog.icrr.u-tokyo.ac.jp/osl/?r=616 * Measured IMC mode matching ratio: 86.2 % (Could be fairly worse right now since we had re-installation work after this measurement) * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=5019 * Measured MCe RoC: 37.33(9) m * http://klog.icrr.u-tokyo.ac.jp/osl/?r=711 * Measured AOM actuation efficiency: 5.064(7) MHz/V (x2 for double-pass) * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3172 * Measured laser PZT actuation efficiency: 1.48 MHz/V (NOTE: 1.26 MHz/V using AOM, not klogged) * http://klog.icrr.u-tokyo.ac.jp/osl/?r=2853 * Laser temperature actuation efficiency: not measured yet * Measured mirror actuation efficiency: 17.2 MHz/V(MCe), 15.9 MHz/V(MCi), 14.9 MHz/V(MCo) @DC (could be wrong; inconsistent between measurements) * http://klog.icrr.u-tokyo.ac.jp/osl/?r=2985 * http://gwclio.icrr.u-tokyo.ac.jp/lcgtsubgroup/inoutoptics/2015/06/mce625-26.html#comments * MCe pendulum frequency: 0.955 Hz * Measured IMC optical gain: 18.6 V/MHz (cavity pole=5.6kHz) (NOT UP TO DATE; we changed laser power, detection optics since then) * http://klog.icrr.u-tokyo.ac.jp/osl/?r=2979 * Reference cavity parameters: finesse 1.1e4, length 10 cm (spec), cavity pole 68 kHz * Counts to volts, volts to counts: * ADC: 2^16/40 counts/V * DAC: 20/2^16 V/counts * IMC oplev calibration: * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3175 * Calibrated IMC WFS noise level, and some noise hunting: * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3366 * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3335 * Accelerometer on the PSL table: * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3373 * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3435 * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3689 * IMC length NoiseBudget code: * https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/FSS/IOO.slx * https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/FSS/IOO_params.mat * https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/FSS/mnNb_Lib.slx * Frequency stabilization servo modeling (design): * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=3330 * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=2908 * Roughly measured beam profiles for Gouy telescope * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3156 * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3218