​​Commissioning status: 2019/9/17

​​Interferometer locking

  • ​​Trying to lock PRFPMI
  • ​​So far, TR-CARM + RF-DARM with 3f for PRCL and MICH up to 50Hz CARM offset 
  • ​​Filter shape adjustment for hand over of TR-CARM to RF-CARM on going
​​Issues
  • ​​Beam clipping at IFI ?
  • ​​IMC spot position on MCo does not look good
  • ​​ALS noise
  • ​​Why the fiber noise cancellation performance cannot be better ?
  • ​​Fringe from non-perfect AR ?

​​ASC

  • ​​Modified the optical layout of REFL and AS to accommodate PZT mirrors for the QPD centering servo.
  • ​​Noticed beam clipping at the REFL port.
  • ​​It seems to be happening in IFI

​​VIS

​​Basic damping
  • ​​Implemented on all the suspensions
  • ​​Type-B/Bp filters may introduce too much noise during the observation
  • ​​Need to implement narrow band low noise damping filters (see below)
​​
​​Kill individual resonances
  • ​​Mostly done for all the Type-A
  • ​​Remaining problems in ETMX, ITMY
  • ​​Filters need to be readjusted as the payload temperature changes
  • ​​Need to be implemented on Type-B/Bp 
  • ​​Probably we need to fight against new resonances when we start ASC feedback
​​
​​Actuator diagonalization
  • ​​Done for all the cryo-payloads (is this correct ?)
  • ​​Some L2A decoupling was done for BS before, but may not work properly now.
  • ​​We need to revisit L2A for Type-B/Bp
​​
​​Sensor correction
  • ​​Implemented on ITMY,  ETMY and ETMX for IP and BF
  • ​​ITMX is IP only
  • ​​Work on going to implement this on Type-B IP
  • ​​If necessary we can implement it for Type-Bp BF
​​Calm down mode
  • ​​Implemented for all the Type-A, but only ETMY is working.
  • ​​Need to tune the filters for the other Type-A
  • ​​Once the Type-B suspensions have low-noise damping filters, we probably want to implement a calm down state for them (noisy but powerful damping)
​​

​​OMC

  • ​​Mirror alignment jigs arrived
  • ​​We will test them on Sept. 24 and 25 when Somiya-san comes and remove the OMC from the suspension.
  • ​​Design work on other modifications is ongoing (about 70% done)
  • ​​Test of M2052 for damping the OMC breadboard is ongoing in Mitaka by Takahashi-san

​​PRC-PBS

  • ​​The plan is to ask LMA to make 3-inch low-loss PBS