= Minutes of the ISC Meeting on 2015/9/7 =
2015/9/7 14:00 - 15:00 Participants: Nagano, Enomoto, Hirose, H. Yamamoto, K. Yamamoto, Y. Michimura, Miyakawa, Aso, Arai, Akutsu, Hirose

== Electronics preparation status for iKAGRA ==
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=4215|Summary by Michimura-kun]]
 * Need to check if the power cables for the DC PD were purchased (A/I Aso)
 * Need to make a cabling diagram as soon as possible. (A/I Michimura)
 * Need to make patch panel to be mounted on the optical tables.
 * The low loss RF cables are very rigid. Need to mount N-connectors on patch panels.

== Output Optics ==
=== OMC suspension ===
 * [[attachment:150907.pdf|OMC suspension slides by Somiya-san]]
 * KAGRA's requirement on the OMC vibration is about 100 times more stringent than aLIGO. However, aLIGO's OMC suspension performance seems to be comparable to KAGRA requrirement (to be checked).
 * aLIGO used different approach (scattering) to set the isolation requirements.
 * Somiya-san proposed to use UWA suspensions.
  * If the OMC is suspended by one wire, it will move a lot. So actively controlling the orientation is important.

=== Output Optics Layout ===
 * We need to fix the number of chambers, size, height and locations.
 * We will proceed with current proposal by Somiya-san.
 * Aso will check the mode matching calculations
 * OMC chamber may be a bit too crowded ?
  * aLIGO OMC damps all the ghost beams inside the OMC
  * It is better to enclose the OMC with black glass walls to protect it from stray lights
  * Beam dumps only have to take care of micro watts, if the OMC is protected by a beam shutter.

== Next Meeting ==
The next next Monday is a holiday. So the next meeting will be 4 weeks later. 2015/10/5(Mon) 14:00 - 15:00 I will consider if we can have a meeting somewhere earlier.