2018/4/17(Tue.)

* Remote participants by eZuce: None

Report of work (*:responsible person)

• VAC: *Kimura
  • Large leak was found but it is not identified where it is. Currently Vacuum level is 200Pa, but it should be around 0.1Pa if no leaks.
• ETMX: *Hasegawa
  • Damping for yaw woks somehow and RMS is ~0.2urad.
  • A very high Q peak was found on pitch and it takes several hours to be calm. This high Q seems to be Sphere parts.
• ETMY: :Miyamoto, Shishido
  • No progress for damping.
• ETMY: *Okutomi
  • ETMY TF was measured. Not only 2 but all F1, F2, F3 seem to be locked. Moving FR may fix the lock.
• DGS: *Yamamoto
  • IO chassis of k1ioo was disconnected somehow.

Work plan (*:responsible person)

• IFO: Enomoto, Nakano
  • Damping, BS L2P, restoring alignment.
• VAC: *Kimura
  • Identifies the location of leak.
• VAC: *Inoue
  • Vacuum gage for wide area will be installed.

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.
• IO chassis of k1ioo was disconnected somehow.
• A very high Q peak was found on pitch and it takes several hours to be calm. This high Q seems to be Sphere parts.
• ETMY TF was measured. Not only 2 but all F1, F2, F3 seem to be locked. Moving FR may fix the lock.