ISC Meeting on 2020/07/06 13:30 - 14:30
Participants:
Zoom meeting: https://zoom.us/j/5045179604
Your time zone: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20200706T0430
Next meeting
When necessary
Minutes
Agenda
- RECORD THE MEETING
- Summary of current measurements so far
- LSC sensing matrix, measurements vs simulation
Optickle simulation: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11767
- Parameter choice of "BRSE_SDMR1_17_45" OK?
Measurements: https://klog.icrr.u-tokyo.ac.jp/osl/?r=14515, https://klog.icrr.u-tokyo.ac.jp/osl/?r=14593
- Schnupp asymmetry measurements
Time of flight measurement successful https://klog.icrr.u-tokyo.ac.jp/osl/?r=14575
- PRC length measurements
PRY length: 68.28 m with the error of roughly 1 m (designed: 64.926 m) https://klog.icrr.u-tokyo.ac.jp/osl/index.php?r=14555
PRX length: about 68 m https://klog.icrr.u-tokyo.ac.jp/osl/?r=14633
- Actuator efficiency inconsistent between measurements?
- OMC scan to see mode content of AS beam
- carrier and f1 3rd mode is overlapped?
- Frequency noise coupling
- Arm cavity round-trip loss measurement with birefringence effect correctly taken into account
P-pol and S-pol PDs placed on POS table https://klog.icrr.u-tokyo.ac.jp/osl/?r=14622
- LSC sensing matrix, measurements vs simulation
- Birefringence simulations with FINESSE
- Any volunteer to add polarization to FINESSE code?
- "directional beamsplitter" could be used to simulate DRFPMI with FINESSE using s/p two-world approach [Haoyu]
Copy from previous meeting
- Simulation activities necessary
- LSC and ASC simulations with current ITMs and current interferometer setup
- Especially LSC simulations not done for PRFPMI and DRMI, and 3f locking
- Compare measured LSC and ASC sensing matrices with simulations
- Compare measured recycling gain (for carrier and sidebands) with simulations
- Compare measured AS mode content with simulations
- Compare measured MICH/PRCL/SRCL controls noise coupling with simulations
- Compare measured intensity/frequency noise coupling with simulations
- Thermal lensing in BS
- LSC and ASC simulations with current ITMs and current interferometer setup
- Measurements necessary to do simulation work
- PRC (SRC) length and Gouy phase
- Schnupp asymmetry
- modulation depth (arm cavity scan)
- arm cavity length (arm cavity scan)
arm cavity round-trip loss measurement with birefringence effect correctly taken into account (with PBS at POP/POS and TRX/TRY) JGW-T2011633
- Power recycling gain for carrier and sidebands
- Throughput from IMC output to AS RF, OMC DC, REFL, POP, TRX, TRY
- Measurements necessary to compare the result with simulation
- frequency/intensity noise coupling, down to ~10 Hz
- Measure power recycling gain for sidebands (POP 2f with FPMI locked and PRFPMI locked)
- DRFPMI LSC and ASC sensing matrix
- MICH/PRCL/SRCL to DARM coupling
- Measure MICH contrast defect with MICH locked and FPMI locked
- OMC cavity scan to scan mode content of AS beam
https://docs.google.com/spreadsheets/d/1w4q8OvX9E6nkYSgshLYLoZH5yvQXHvGmL1agux8ztx0/edit#gid=0
- Type-A, B, Bp actuation efficiency measurements (for actuator noise)