2017/3/1(Thur.)

• Remote participants by eZuce: None
• Report of work (*:responsible person)
  • Height change of PRs: Tomaru, *Aso, Takahashi, Ohishi, Miyo
    • We opened the PR2 and PR3 chamber and we confirmed that the height of keystone and mirror of PR2 and PR3 were not at the wrong point.
    • PR2 was within ~1mm range and PR3 was ~5mm range from the center line. The height of RP3 was changed a bit by fishing rod, and we did not change PR2.
    • Fishing rods worked well and still were within the range.
    • LVDT seemed to have jumps several times in the past, so absolute position of LVDT is not trustable.
      • Recorded the current height and current value.
    • It means that the beam changed upstream PR like IMMT, or MC.
    • We absolutely need monitors to check beam position at all the mirrors.
  • IOO: kokeyama
    • A good IO chassis changed and everything seems to be OK now.
  • AOS:
    • Lasers of oplev will can be dying soon.
      • The lifetime is about 100000h.
  • Camara: Yokozawa, Inouse
    • We tried to see BS using Tcam at IXC, but we could not see the BS even with an illuminator. This may be because of the limit of area of viewport on the gate valve.
  • CRY: mirror temperature ~94K.
• Work plan (*:responsible person)
  • Alignment:
    • IMMT and MC will be aligned to center PRs.
• Laser hazard: AM: PSL, PM: Upstream SR2-3 line, and Y-end.
• Weekly
  • Week of 2/26
    • ETMY tuninng.
    • Beam alignment to REFL port.
    • 2/28: Height change for PRs
  • week of 3/5
    • IYC door will be closed.
    • Exchanging items and cleaning inside the PR2 chamber
  • week of 3/12
    • TMS installation at ETMY.
    • Connecting ducts at the corner area.
  • week of 3/19
    • Vacuum test at at the corner area.
    • TMS alignment using green light at ETMY.
• Issues