= 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

[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/MIF/TaskList|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.
  * 40m LSC model design https://dcc.ligo.org/LIGO-G1100116
  * Length sensing and control of the Caltech 40m prototype[[http://%20https://dcc.ligo.org/LIGO-G1300950|https://dcc.ligo.org/LIGO-G1300950]]
 * 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.

The next meeting: 2016/5/2 14:00 - 15:00