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ISC Meeting on 2020/06/15 14:00 - 15:00

Participants:

Zoom meeting: https://zoom.us/j/6676627462

Next meeting

TBD

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Minutes

Agenda

Useful links to know KAGRA interferometer design and status
- List of optical parameters OptParam
- MIF Design document JGW-T1200913
- Interferometer design paper Phys. Rev. D 88, 043007 (2013)
- Latest KAGRA status paper arXiv:2005.05574
- Summary of measurements related to the interferometer so far Minutes20200309
- O4 schedule JGW-E1809209
Interferometer issues which require simulation studies
- ITMs have different transmission (ITMX: 0.444 % ITMY: 0.479%) JGW-T1910352
- ITMs have inhomogeneity Phys. Rev. D 100, 082005 (2019)
- ITMs have inhomogeneous birefringence JGW-G1910369, JGW-G1910388, JGW-T2011633
- So far no success in locking DRFPMI JGW-G2011693
- WFS not working well JGW-G2011687
- Laser intensity noise and frequency noise coupling are too high JGW-T2011662
Status of simulation activities
- LSC simulations with Optickle originally by Yoichi Aso https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/mif/IFOmodel
  - Used for designing the interferometer, and deriving requirements JGW-T1200913
  - Simulations for O3 by Yutaro Enomoto JGW-T1910341
  - Mach-Zehnder modulator simulations by Kohei Yamamoto Classical and Quantum Gravity 36, 205009 (2019)
- ASC simulations with Optickle originally by Yuta Michimura https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/mif/ASC-Optickle
  - Used for designing the interferometer JGW-T1200913
  - Simulations for O3 by Yuta Michimura JGW-T1910359
- FINESSE model originally by Kentaro Somiya
  - Used for OMC design JGW-T1808043, Optical Review 22, 149-152 (2015), J. Phys.: Conf. Ser. 957, 012009 (2018)
  - ITM inhomogeneity effects Phys. Rev. D 100, 082005 (2019)
  - Also being used for simulating birefringence effects
- Parametric instability
  - Activities in University of Toyama using COMSOL JGW-E1910382
- Thermal lensing ?
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 sensing matrix 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

KAGRA/subgroup/ifo/MIF/Minutes20200615 (last edited 2020-06-15 15:21:06 by YutaMichimura)

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-   * Used for OMC design [[https://link.springer.com/article/10.1007/s10043-015-0028-2|Optical Review 22, 149-152 (2015)]], [[https://iopscience.iop.org/article/10.1088/1742-6596/957/1/012009|J. Phys.: Conf. Ser. 957, 012009 (2018)]]
+   * Used for OMC design [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8043|JGW-T1808043]], [[https://link.springer.com/article/10.1007/s10043-015-0028-2|Optical Review 22, 149-152 (2015)]], [[https://iopscience.iop.org/article/10.1088/1742-6596/957/1/012009|J. Phys.: Conf. Ser. 957, 012009 (2018)]]