• KAGRA
• Commissioning
• Weekly
• 20190521
• Agenda

2019/5/21 15:00-16:00 Weekly commissioning meeting topics

• Zoom URL: https://zoom.us/j/6676627462

• Assignment of staffs

  • https://teamup.com/kswnmta8p18h6u1uab

Schedule

• 5/14: RT PC maintenance -> go to safe mode for all VIS connected Dolphin (BS, )

• 5/17~ increasing ETMY temperature.
• 5/20-24: Exchanging cryo valves.
• Center
• ITMX:
• Xend

  • 5/2: Cooling start

  • 5/29: Cooling done
• Yend
• End of April~: Y arm commissioning
• ~End of May: Y arm and FPMI commissioning

Discussion

• Low finesse on Y arm
  • 2019/5/17(Thu)
    • X-arm:
      • Finesse = 1399
      • Power build-up factor = 891
      • Ring-down half-life = 3.11msec
      • REFL POWER locked/unlocked = 0.96
    • Y-arm:
      • Finesse = 28
      • Power build-up factor = 18
      • Ring-down half-life = 0.42msec
      • REFL POWER locked/unlocked = 0.50 (agrees with experiment)
  • 2019/5/17(Thu)
    • Finesse of Yarm for green: 17 (design 50)
  • 2019/5/17(Fri)
    • Finesse of Yarm for IR: 120, ETMY temperature 33K
  • 2019/5/19(Sun)
    • Finesse of Yarm for IR: 146, ITMY temperature 25K, ETMY temperature 51K
  • 2019/5/20(Mon)
    • Finesse of Yarm for IR: 131, ITMY temperature 25K, ETMY temperature 60K
    • Finesse of Xarm for IR: 1151, ITMY temperature 29K, ETMY temperature 126K, but alignment at ETMX
  • 5/17~ tuned off ETMY cryostat cooler
  • 5/22~ tuned off ITMY cryostat cooler
  • 5/24~ inject Nitrogen to increase temperature close to room temperature?