= KAGRA Filter Cavity Kick-off meeting =

== Date/Time/Location ==

2021 Jan. 20th from 10AM


Connection: KAGRA Zoom2

== Abstract ==

This is a project to install a filter cavity into KAGRA. It is not funded yet, but we should start preliminary design studies to prepare for the time when a fund is available. This meeting's purpose is to gather interested people and identify potential tasks to start this project.


== Minutes ==
 * Introduction (Aso) [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12478|Slides]]
 * Technical overview (Matteo)
 * Identification of Tasks
  * Clarify the constraints
   * Check available space, location
    * Tomaru-san started investigation with Araki-san
     * Near IYA, air ducts may interfere
    * Using X-arm is also an option to consider
    * Beam height choice (same as the main beam or lower)
   * Vacuum interface
    * Check available flanges on OMC or OMMT chambers
    * Can we penetrate the X-arm duct ?
    * Cryostat door interference if we use the same beam height as the main beam 
	* Put GVs to make a removable section next to cryostats ? : risk of vacuum leak.
    * Vacuum modifications in conjunction with overall KAGRA vacuum upgrade ?
  * Conceptual design
   * Filter Cavity Optical Design
   * Squeezer design
    * Doubly resonant OPO
    * In-vac OPO ?
   * Interface optics design
    * Squeezer -> FC
    * FC -> MIF
   * Back scattering mitigation
    * Theoretical study on requirements
    * New IFI ?
   * Suspension design
   * Vacuum design
    * Baffles in the beam duct ?
    * Movable targets ?
   * Clean room design
   * Control system
    * FC LSC
    * FC ASC
    * ASC for FC->MIF coupling
   * Control system hardware
    * Analog electronics
    * DGS
  * Milestones for the conceptual design
   * Intermediate status review in April 
   * Conceptual design review in July 
     * Mutual review of the working group
     * Internal review by KAGRA members not involved in the working group
     * External review by LIGO/Virgo experts
  * Make a realistic budget
  * Make a project schedule
 * Confirm available members
  * We heard from participants about their interested area of contribution
  * Matteo and Aso will contact people individually for further discussion on the task assignment
 * Schedule regular meetings
  * We will hold biweekly meetings
  * Schedule of the meeting will be decided by Doodle poll.


== Agenda ==

 * Introduction (Aso)
 * Technical overview (Matteo)
 * Identification of Tasks
  * Clarify the constraints
   * Available space, location
   * Vacuum interface
    * Available flanges on OMC or OMMT chambers
    * Can we penetrate the X-arm duct ?
    * Cryostat door interference ?
	- Put GVs to make a removable section next to IYC
    * Vacuum modifications in conjunction with overall KAGRA vacuum upgrade ?
  * Preliminary design
   * Filter Cavity Optical Design
   * Squeezer design
    * Doubly resonant OPO
    * In-vac OPO ?
   * Interface optics design
    * Squeezer -> FC
    * FC -> MIF
   * Back scattering mitigation
    * Theoretical study on requirements
    * New IFI ?
   * Suspension design
   * Vacuum design
   * Control system
    * FC LSC
    * FC ASC
    * ASC for FC->MIF coupling
   * Control system hardware
    * Analog electronics
    * DGS
  * Milestones for the preliminary design
   * Intermediate check in March or April ?
   * Preliminary design review in July ?
  * Make a realistic budget
  * Make a project schedule
 * Confirm available members
 * Schedule regular meetings
  * Biweekly ?