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

 * Zoom URL: [[https://zoom.us/j/6676627462|https://zoom.us/j/6676627462]]
 * Assignment of staffs
  * [[https://teamup.com/kswnmta8p18h6u1uab]]


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==== Schedule ====
 * 5/14: RT PC maintenance -> go to safe mode for all VIS connected Dolphin (BS, )
 * 5/20-24: Exchanging cryo valves.
 * 6/8: Engineering run

 * ITMX
  * 5/22AM~: tuned off cryostat cooler, finesse measurement for Xarm

 * ETMX
  * --(5/2: Cooling start)--
  * 5/29: Cooling done

 * ITMY
  * 5/23AM~: tuned off cryostat cooler, finesse measurement for Yarm
 * ETMY
  * 5/17~: tuned off ETMY cryostat cooler
  * 5/24PM~ inject 100Pa Nitrogen.
  * 5/27 evacuation of Nitrogen.
  * 6/3-6/14: Installation of TMS for ETMY




 * 4/22-5/31: Yarm commissioning	
 * 5/27-6/30: DRMI commissioning
 * 7/1-8/9: DRFPMI commissioning
 * 8/12-10/4: DRFPMI ASC
 * 10/7-11/15: Post Commissioning
 * 11/18-12/13: Noise hunting

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=== 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(probably due to the miscentering), ITMY temperature 29K, ETMY temperature 126K, but alignment at ETMX

 * Cryo status and plan
  * ETMY
   * 5/17~: tuned off ETMY cryostat cooler
   * 5/24PM~ inject 100Pa Nitrogen to increase temperature. It takes several days close to room temperature ?? degree.
   * 5/27 evacuation of Nitrogen.

  * ITMY
   * 5/23AM~: tuned off cryostat cooler, finesse measurement for Yarm

  * ITMX
   * 5/22AM~: tuned off cryostat cooler, finesse measurement for Xarm

 * Chance for Y arm finesse measurement: 5/21, 5/23 and after 5/29 of evacuation of Nitrogen
  * Searching good spot on Yarm

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