Minute of KAGRA commissioning meeting

• Date: 2018/7/17 11AM~12PM
• Attendance: Miyakawa, Miyamoto, Aso, Nakano, Yokozawa
  • eZuce: Shoda, Izumi, Ushiba

Clipping loss (Izumi)

• 20mm misalignment is acceptable for beam cetering.
• 40mm misalignment is acceptable for WAB cetering.
• Could be factor of 2 different in loss.

ETMX (Miyamoto)

• Side of screw of frame was almost touching in the room temperature and after starting cooling it was actually touching.
• Then it was found that F2 was almost dead. Even VIS team pulled wire but LVDT did not work.
• Then pump down started without F2 fix.
• New measurement shows it seems to be OK except for 2.4Hz peak probably due to the dead of F2.
• Cooling started the last Friday.
• Heat link does not affect so much.

LAS

• Fiber was broken just before moving the laser to Kamioka.
• We have 1 + 1spare = 2.
• Low power below 15A has many peaks.
• Low frequency RIN is proportional to the power.
• Movement to Kamioka will be the 24th of July.

PSL

• PMC and iMC layout including MZ is being changed.

rack cleaning

• Cable cleaning on BS rack is being continued.
• pile of AA or HPCD can be hot.

Others

• Next meeting: 7/24.