Optical Path from IMC to PRM (Yokozawa, and Akutsu)

STM1/2

• Mirror mount stability with cables
• Beam positions on them
• Trans beam from STM2

IFI to IMMT1

• IFI injection: No clipping
• Beam position on IMMT1
• Trans beam of IMMT1
  • No change to ISS path?

IMMT1-IMMT2

• Beam clearance: no problem
• Beam position on IMMT2

IMMT2-PRM

• Main beam/misaligned beam clearances: no problem against the beam dumper
• The misaligned beam position: hits on the dumper(?) and the temp enhancement was detected.

Around PRM

• Beam position on PRM
• IR beam in the midsize baffles(HR/AR side)

Suspension Condition of IMMT1/2. (Takahashi, Ushiba)

IMMT1

• Mechanical
  • Mag-coil

IMMT2

Oplev Check for IMMT1. (Yokozawa-kun)

Beam Power

• 0.7-0.8 mW input:

Beam Path Clearance

• IMMT1

QPD centering

Calibration

PYL Separation(after pumping?)

Spectrum Health

Oplev beam's stray light influence

• almost no light? as before.

Oplev table Covering

• we will do this after closing.

(3)Mid-size Baffles (Akutsu-kun and his selected persons)

Done on 22nd August.

Approved all processes of setting the mid-size baffles.

(SR3 oplev path is pointed out to be near the structure.)

(4)Beam Path (Ushiba-kun, Tanaka-kun?, Hirose-san?)

Main beam - IR beam hit and through around the center (or acceptable area) of optics from inside IFI tank -> SRM.

GR beam - GR beam hit and through around the center (or acceptable area) of optics?

• (assuming GR beam on POP/POS also pass through around the center (or acceptable area) of optics)

Relative positions btw Mid-size baffles and IR/GR.

AR-SRM reflection beam control - Where is the reflected beam from SRM? When misaligned, should it hit the mid-size baffle on SR2 or other? Should we make it possible to align SRM even if it has less reflectivity for RSE?

(5)IFI-IMMT tank

Stray light mitigation(Akutus-kun and selected persons) - The predicted stray beams are dumped? - Is there any missing stray beam paths?

ISS beam/CWP reflection beam extracting (??) - the beam paths are clear? - The beams hit around the center of windows? - The reflected beams on the windows are dumped?

(The IFI new poles seem to be dangerous due to the vibration made by drilling.)

Beam dumper(Akutsu-kun and selected pesrons) - Does the thermometer works?

(6)Vacuum system (Kimura-san / Uchiyama-kun and their selected persons)

Numbering for all ports.

Check the flange seal surface condition.

Decide where the elastomer/Metal gasket will be used.

Top hat seal surface check for SRM/2/3 BS PRM/2/3.

ICF152 flange preparation for the new reducer flanges at SRM/PRM.

Check dust/fungus in stocked tubes/bellows.

(7)Cleanness of Mirrors HR/AR

FC was done for all mirrors' HR/AR, except for OMC Typ-C mirrors.

Check the surfaces and inside again before closing, and blow/absorb as much as possible if you find anything.

(8)Vacuum tank cleaning

In Basic, the cleaning was done after FC. Check inside again and clean just before closing if you find something.