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 * Inhomogeneity of a low absorption crystal will be measured in the next month so that we can do the simulation.
 * The ITM AR polish specification will be 6nm RMS in best effort basis.
 * All of the crystals from the US company had high absorption. Characerization of two domestic samples wll be done in the next two weeks.

ISC Meeting on 2016/4/18

2016/4/18 14:00 - 15:00

Participants: Miyakawa, Aso, Nakano, Ando, Arai, H. Yamaoto, Michimura

1. What to do just after the iKAGRA test run.

  • Save and note all the interferometer settings, configurations to write a paper
  • Calibration confirmation, actuator efficiency measurement
  • Can we measure the Schnupp asymmetry somehow ?
  • Stop the clean booth filters and see if the noise changes
  • Take noise spectra using an analog FFT analyser up to very high frequency. Compare it with the spectrum taken by the digital system.
  • Measure the accurate position of the mirrors (PR3 and BS) with respect to the markings on the floor.
  • oplev stability, noise measurements (with mirror fixed)
  • scattering noise investigation
  • measure PR3 suspension Q values

2. Planning towards bKAGRA

ISC Task List

  • A possibility of operating a room temperature Michelson interferometer at the end of May 2017 is under discussion.
  • How to motivate the development of digital models.
    • It will be good to design the feedback system just like designing analog circuits (not ad hoc development but make a well documented design).
    • The next release of the realtime code may work without actual hardware (ADC/DAC etc). This is a good opportunity to start working on the simulated plant.
  • How to check the length between PR2-PR3 or SR2-SR3. Measuring the Gouy phase ?
  • Simulation work: shall we make official interferometer models (Optickle and Finesse) of KAGRA ?
  • OMC: If the engineering hardle of all-glass OMC is too high, how about making one with metal first ?
    • A kick off meeting is necessary for OMC
  • Items necessary for bKAGRA phase 1 and one for later should be distingished.

3. Status of the simulation for the ITM spec.

  • Inhomogeneity of a low absorption crystal will be measured in the next month so that we can do the simulation.
  • The ITM AR polish specification will be 6nm RMS in best effort basis.
  • All of the crystals from the US company had high absorption. Characerization of two domestic samples wll be done in the next two weeks.

KAGRA/subgroup/ifo/MIF/Minutes20160418 (last edited 2016-04-25 10:10:50 by YoichiAso)