2017/2/5(Mon.)

• Remote participants by eZuce: Takahashi, Aso
• Report of work (*:responsible person)
  • Vibration Isolation,
    • Restarted the BS realtime model.
  • Alignment: Izumi, Okutomi
    • ETMY transfer function has a different shape from what was measured before in the air. It means that ETMY might be touching somewhere.
      • For vertical, below BF transfer function seems to be OK.
      • Yaw might be rotating too much.
        • After 1/17, ETMY started showing something strange. Stiffness changed gradually, but Q did not change much.
• Work plan (*:responsible person)
  • Alignment: *Izumi, Okutomi
    • We will rotate IP yaw to release somewhere touching. This work takes 1day at least.
    • Detchar for spectrum of suspension is necessary as soon as possible.
  • Vacuum
    • Gate valve will be closed today.
    • Needs 2days for evacuation. If once evacuated, cooling will be late ~2weeks.
  • Type B
    • SR assembly continues.
• Laser hazard: PSL. At some in this evening, it will be the are over the SR line for double-checking the IMC alignment. Kokeyama is responsible for it.
• Weekly
  • Week of 2/5
    • Finding causes of ETMY trouble.
      • Evacuation might be needed if ETMY is touching somewhere.
      • Cooling also will be delayed for 2weeks or so.
• Issues
  • The ETMY mirror showed a strange scattering pattern.