= 20181006 =
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6452]]
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6455]]
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6458]]

== Today's activities ==
Workers: Akutsu, K. Nagano

=== BRT part installation ===

 * See [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6455|here]]

=== GPT part installation ===
 * We brought five QPD mechanical basis with plastic case which was used to store Dsub cables.
   * AFTER QPD INSTALLATION, WE SHOULD RETURN THE BOX TO 低音鏡機械室.
 * After BRT part was installed and aligned, we started to install GPT part (in-air part).
 * We found that damping of TMS-VIS was not necessary for GPT installation.
 * Following the [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8962|design]], we installed the beginning part of the  green light path, two periscope mirrors, two steering mirrors, and one lenses.
   * First periscope mirror (GPM1): TFM-50C080532 (Opto-Sigma)
    {{attachment:GPM1.jpg|GPM1|width="400" }}
   * Second periscope mirror (GPM2): TFM-50C080532 (Opto-Sigma)
    {{attachment:GPM2.jpg|GPM2|width="400" }}
   * First steering mirror (GST1): TFM-50C080532 (Opto-Sigma)
    {{attachment:GST1.jpg|GST1|width="400" }}
   * Second steering mirror (GST2): TFM-50C080532 (Opto-Sigma)
    {{attachment:GST2.jpg|GST2|width="400" }}
   * First lens (GLNS1, f=500): LA1380-A-ML (Thorlabs)
    {{attachment:GLNS1.jpg|GLNS1|width="400" }}
 * At first, all mirrors were installed. Then the lens was installed not to change beam position.
 * The lens position, i.e. beam profile, was not tuned since the tuning was not so effective without arm cavity locked.
 * In the end of today's work, we installed DC PD (PDA100A2, Thorlabs) after GST2 temporarily. The gain was set to 0 dB.
  {{attachment:GPD_gain.jpg|GPD|width="400" }}
 * After all, GPT part looks like below.
  {{attachment:Overview.jpg|overview|width="400" }}
 * The signal was checked like [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6452|this]].
   * Enomoto-kun kindly built model (k1aostmsx) and restarted k1dc0 to register channel for IR and Green DC PD befor the above klog6452.

== Next plan ==
 * Align and balance the BRT and the TMS-VIS.
 * Configure the digital models properly.
 * Detach the remaining white tapes just before closing the chamber; be noted that there are white tapes on the PEEK connectors at the inside of the flanges.
 * Torque completely the bolts which are fixing the upper and the lower base plates.
 * Insert metal gaskets before torquing the ICF203 flanges with Dsub connectors.

 * Install optics after GBS1
 * Install gigE camera
 * Modify MEDM screen
   * Add DC PD and so on.
 * Cable Dsub 15pin for TMS-VIS OpLev.
 * Modify cabling for DC PD.
 * Return plastic box.
 * Install rails in digital rack.
   * They may be necessary under LVDT distributor, geophone distributor, and WHT board.
   * Nagano is not sure it is necessary under HP coil driver.
 * Consider how to cable Dsub cables to QPD.

== Wanted! ==
 * A document for learning how to release or fix the suspended tables (by Uraguchi?).
 * FIVE QPD electronics boards