FPC Meeting on 2019/03/08 13:00 - (JST)

Participants: Chunglee Kim, Kentaro Komori, Matteo Leonardi, Yuta Michimura, Atsushi Nishizawa, Kentaro Somiya, SH

Zoom meeting(2): https://zoom.us/j/6676627462

• Next meeting will be around beg. April before f2f (doodle poll will be circulated).

• Satellite meeting of KAGRA Future Upgrades on April/18 at 13:30-

• Back to FPC page

Action Items

• Collecting the science part (Coordinated by Nishizawa, ... )
• More detailed scoring of science cases (currently only factor of 2 or not)

• Scoring the relevance to KAGRA and feasibility of each technology: [[https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0095/M1909590/004/Score_v2.1.xlsx|current version) by KS, YM, SH: done, circulation to ML, KK

• Sensitivity optimization
• Fill-up the remaining part in Technology Survey coordinated by
  • Matteo : squeezing and filter cavity
  • Michimura : Low frequency related
  • Haino : Cryogenic and mirrors based on inputs
• KAGRA sensitivity code management
  • Matteo: Integrating Michimura-san's python code with GWINC (JH)

  • Update Noise spectrum of each technical noise

  • Review and check the squeezing parts (Matteo, Eleonora, ...)
• Talks

  • LVC meeting slides to be circulated, talk request already submitted to CPC

  • GWADW, May/19-25

Minutes

• Review of science section (Nishizawa)Slides

  • We are waiting for 9 topics for CBC and 3 for others

  • (Somiya) What is the frequencies of higher order ((3,3), (4,4)) bringdown modes ? => similar to the fundamental mode (2,2)

  • (Haino) The sensitivities in P.11 (Stellar oscillation) look strange => to be checked with the author

  • (Haino) Why KLF >> bK for BNS ? => Narrow band (like LF) can break the degeneracy for BNS

  • (Haino) More detailed scoring would help to evaluate which upgrade plans have more science cases => action item

• Some new idea and discussion of sensitivity optimization (Haino) Slides

  • (Matteo) Why don't we try to combine 40kg and high power instead of FD squeezing ? => It can be also done, but the feasibility of 40kg mirror is still uncertain. So SH thought that FD squeezing is a bit more feasible at this stage.

  • (Matteo) Increasing the filter cavity length from 100m to 300m is just the scaling of cost, which we need a kind of technological jump from 30m to 100m. The longer filter cavity is more important for heavy mass upgrade option.

  • (Somiya) Buonanno & Chen code (BnC) can also take account of finite SRC length by modifying the beta term

  • (Somiya) Why higher finesse is not preferred ? => The arm round trip loss (rtl) is more limiting the sensitivity with higher finesse

  • (Somiya) We should score each technology both in relevance to KAGRA and feasibility => action item

• KIW5 (Feb./16) report (Michimura, Haino)

  • Report from Michimura-san in lab seminar

  • Close collaboration with Gianpietro (Geppo) Cagnoli at ILM for the possibility of large sapphire crystals.

• FPC talk in LVC meeting (Mar./18-21) (Haino)

  • Now talk is assigned at Instrument science plenary: Link to DCC (not accessible with KAGRA)

• Satellite meeting at f2f, Apr./18

  • We may ask to some FPC sub-groups (now a kind of sub-people) to give talks. We will also ask for contributed talks.

• GWADW, May/19-25

  • A few from FPC will go there, we may ask for a few talks related with FPC ?
• etc.

  • Some complains on the current format of references in the white paper. => At this stage we accept any kinds of reference formats and later on we will convert into one specific format.