= ISC Meeting on 2016/1/25 =
14:00 - 15:00 on !SeeVogh

Participants:  Arai, H. Yamamoto, Michimura, Somiya, Aso, Hirose, Miyakawa, Kokeyama

 1. Schedule for iKAGRA (Aso)
  * Installation of the analog electronics
  * Installation of the detection optics
   * Above two will be done in the week of 2/15
  * Initial alignment procedure
   * Michimura-kun will make a document
  * Digital system integration and lock acquisition
   * Need to test the system beforehand: Will consult with Kokeyama-san
   * Aso will try to gather man power (mostly students)

 1. Electronics Preparation Status (Michimura, Aso)
  * RF PD (Aso, Doi)
   * Expected delivery 2/15

  * Cable assembly
   * RF flexible cables with N connectors: ordered
   * Spare RF flexible cables with SMA connectors: waiting for Ohashi's approval
   * Diff-to-single cables: to be made at the time of installation
   * we have purchased all the other ISC cables

 1. Magnet noise
  * Magnetometer requirement(Michimura)
   * Magnetometer requirement: According to Shimoda report (JGW-T1504459), the magnetic field fluctuation of 0.5 pT/rtHz @ 10 Hz creates the displacement noise of 1e-20 m/rtHz @ 10 Hz for bKAGRA ITM/ETM. If we keep the magnet size as current design (2mm dia, 2mm thick), the magnetic field fluctuation should be smaller than 7 pT/rtHz @ 10 Hz, considering the displacement noise requirement is 1.5e-19 m/rtHz @ 10 Hz. So, 7 pT/rtHz @ 10 Hz will be the requirement for the magnetometer noise (Bartington Mag-03 meets this requirement). However, considering the magnetic field measurement done by Virgo (30 pT/rtHz @ 10 Hz with equipments installed), we might have to change the magnet size to even smaller one.
   * Measurement in LIGO: About 10pT/rtHz in front of an electronics rack
   * MIF requirement: we want to see 7pT

 1. FFT simulation (H. Yamamoto, Hirose)
  * ETM polishing will take until the end of March. -> Simulations with measured transmission maps can be performed only after April.
  * The contract for the ITM polish cannot wait for the simulation result
   * We will target 6nm RMS of equivalent optical path fluctuation for ITMs.
  * Recent mirrors from the US company have large absorption (~ 100ppm/cm)
  * One of the two samples from a Japanese company showed a low absorption (~ 30ppm/cm)
   * Will measure the transmission map after polishing for this sample

 1. Next meting 
2016/2/16 14:00 - 15:00