|
Size: 3029
Comment:
|
← Revision 22 as of 2017-11-28 19:23:27 ⇥
Size: 3368
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| [[KAGRA/Commissioning/CommissioningWorkshop2017|Back to CommissioningWorkshop2017]] | |
| Line 13: | Line 14: |
| * Measured IMC modulation depth: ~0.1 rad (measured??) | * Measured IMC modulation depth: ~0.1 rad |
| Line 19: | Line 20: |
| * Measured IMC round-trip length: 53.3 m * http://klog.icrr.u-tokyo.ac.jp/osl/?r=616 (Could be slightly different right now since we had re-installation work after this measurement) |
* 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 |
| Line 22: | Line 23: |
| * Measured IMC mode matching ratio: 86.2 % * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=5019 (Could be fairly worse right now since we had re-installation work after this measurement) |
* 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 |
| Line 39: | Line 40: |
| * MCe pendulum frequency: 0.955 Hz | |
| Line 40: | Line 42: |
| * Measured IMC optical gain: 18.6 V/MHz (cavity pole=5.6kHz) (not up to date; we changed laser power, detection optics since then) | * Measured IMC optical gain: 18.6 V/MHz (cavity pole=5.6kHz) (NOT UP TO DATE; we changed laser power, detection optics since then) |
| Line 48: | Line 50: |
* IMC oplev calibration: * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3175 |
|
| Line 66: | Line 71: |
* 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 |
Back to CommissioningWorkshop2017
IMC Information
- Current IMC servo topology:
- Common mode servo board configuration:
SLOW (K1:IMC-SERVO_SLOW_CON_IN1) goes to AOM (and IMC length)
- IMC sideband frequency: 13.78 MHz
- Measured IMC modulation depth: ~0.1 rad
- Measured IMC finesse: 540 +/- 70 (NOTE: 458 from cavity pole, not klogged)
- Measured IMC round-trip length: 53.3 m (Could be slightly different right now since we had re-installation work after this measurement)
- Measured IMC mode matching ratio: 86.2 % (Could be fairly worse right now since we had re-installation work after this measurement)
- Measured MCe RoC: 37.33(9) m
- Measured AOM actuation efficiency: 5.064(7) MHz/V (x2 for double-pass)
- Measured laser PZT actuation efficiency: 1.48 MHz/V (NOTE: 1.26 MHz/V using AOM, not klogged)
- 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://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)
- 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:
- Calibrated IMC WFS noise level, and some noise hunting:
- Accelerometer on the PSL table:
IMC length NoiseBudget code:
- Frequency stabilization servo modeling (design):
- Roughly measured beam profiles for Gouy telescope