=== 2018/4/18(Wed.) ===

* Remote participants by eZuce: None

==== Report of work (*:responsible person) ====

 * VAC: *Kimura
  * One of the small leak was found where it was, but another large leak seems to exist. Leak hunting will last today.
  * There are 3 ways to the operation in the newt week;
   * Leak location will be found and fixed without vent. -> ETMX gate valve will open, no delay.
   * Leak location will be found and not fixed without vent. -> Vent on Wednesday and Thursday, fix leak on Friday, pump down on Friday. -> ETMX gate valve will open, delay for several days.
   * Leak location will not be found and not fixed. ->  ETMX gate valve will not open, no delay, but it will be difficult to find beam at ETMX.

 * ETMX: *Hasegawa
  * TF for MM coupling of photo sensor was found.
  * RMS motion seems to be OK if the mirror is not kicked. Even if the mirror is kicked, damping speed is ~10min or something.


 * ETMY: *Nakano, Shishido
  * Yaw dampins seems to be OK. Coupling between pitch and yaw exists. After ~10min or so, oscillation starts up to 10urad.

 * IFO: *Enomoto, Izumi
  * Trial lock of Michelson did not succeed because of too much motion of ETMY.

 * BS: *Eleonora, Izumi
  * We are optimizing diagonalization of L2P filter. Needs more time.

 * DGS: *Yamamoto
  * Interface card for PCIe on k1ioo was exchanged and connection between RTPC and IO chassis was established again.



==== Work plan (*:responsible person) ====

 * IFO, ETMs, BS: Enomoto, Nakano, Izumi, Hasegawa, Shishido, Eleonora
  * Damping, BS L2P, restoring alignment.

 * VAC: *Kimura
  * Identifies the location of leak.


==== Laser hazard ====
 * [AM]
  * IR: Upstream SR2-3 line, Xend 1F, Yend 1F
  * Green: PR2, Xend 1F
 * [PM]
  * IR: Upstream SR2-3 line, Xend 1F, Yend 1F
  * Green: PR2, Xend 1F

 * [night]
  * IR: Upstream SR2-3 line, Xend 1F, Yend 1F
  * Green: PR2, Xend 1F


==== Weekly ====

 * week of 4/16
  * Michelson control.
  * Leak check.
  * Opening the last gate valve.

 * week of 4/23
  * Operation

==== Issues ====

  * Large leak was found but it is not identified where it is.