Differences between revisions 2 and 3
⇤ ← Revision 2 as of 2019-05-21 13:29:21 →
Size: 1610
Editor: OsamuMiyakawa
Comment:
← Revision 3 as of 2019-05-21 13:32:44 → ⇥
Size: 1668
Editor: OsamuMiyakawa
Comment:
Deletions are marked like this. Additions are marked like this.
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 * Low finesse on Y arm ==== Low finesse issue on Y arm ===
 * Status as of now
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 * Cryo status and plan

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

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 issue on Y arm ===

  • Status as of now
    • 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
  • Cryo status and plan
    • 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?

KAGRA/Commissioning/Weekly/20190521/Agenda (last edited 2019-05-21 16:46:38 by OsamuMiyakawa)