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|| ||Sapphire Mirror||M.Leonardi,T.Tomaru||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=xxxx|x]] || || ||Sapphire Mirror||M.Leonardi,T.Tomaru||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10568|o]] ||

Satellite Meeting on Future Upgrade of KAGRA

Main F2F Page

Date/Time/Venue

August 21th (Wed.) 13:00 - (We would like to finish the main discussions by 15:30, when the KAGRA site tour starts)

Venue: Multi purpose room (多目的ホール), Faculty of Science, University of Toyama, Gofuku Campus

(Note that different from the venue of F2F meeting, Kuroda hall)

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

Anyone are welcome to join the discussions on site or via online and for even those who didn't make a registration.

Program

Time

Subject and Title

Speaker

File

13:00-13:30

Introduction

Introduction from FPC

S. Haino and FPC

(↓)

13:30-14:15

Mirror and Cryogenics

Sapphire Mirror

M.Leonardi,T.Tomaru

o

Heat extraction

T.Yamada,T.Tomaru

x

14:15-15:30

Upgrade plans

Upgrade plans and publication

S. Haino and FPC

o

15:30-16:00

Break

16:00-18:00

Discussions

Discussions


Agenda

  • Things happened since the last satellite meeting

  • We have a session dedicated to sapphire mirror and heat extraction
    • Understand the current status of sapphire mirror issues and future prospects
    • Maximum laser power is limited (at least) by the heat absorption and heat extraction capacity. We should understand the current estimation.
  • We would like to get agreement/understanding on the followings:
    • Publication on the KAGRA future upgrades
    • Define the ultimate goal in long term towards 2030's
    • More realistic plans for O5
  • Publication plan (Full KAGRA author)
    • Serve as the 2nd release of the white paper
    • Discussion about the ultimate goal and intermediate plants including O5
    • Share the same idea inside the collaboration as well as to inform it to LV and near-by communities
    • Submission/publication target just after KAGRA manage to join O3 (late 2019~early 2020 ?)
    • Target journal: PRL or PRD ? (depending on the number of pages/figures) c.f. iKAGRA => PTEP, bKAGRA-ph1 => CQG

  • Ultimate goal of KAGRA
    • Time scale around 2030
    • It should fill the gap between O5 and 3G
    • 200 kg Sapphire as the primary candidate (iLM may help us a lot if their proposal is accepted)
    • Backup plan with Silicon ? Decision tree should be prepared
    • With 200 kg sapphire and 500 W laser, 500 Mpc may be possible JGW-G1910533

    • What is the name ? Naming is important: hKAGRA ? (hyper-KAGRA, or h as Heavy-mass and High-power), uKAGRA ? (ultimate-KAGRA) or dKAGRA ? (dream-KAGRA)
  • More realistic plans for O5
    • Due to the ITM issues it may be difficult to achieve the design sensitivity during O4
    • One option is to achieve the design sensitivity (with detuning) of 150 Mpc in O5
    • Detuning doesn't go well with squeezing. Should we give up detuning but BRSE with FD squeezing (60m filter cavity ?)
    • High Freq. (HF) upgrade requires R&D and change of suspensions which may have a risk to worsen the sensitivity, while FD squeezing can be installed independently so that we can go back to detuning option if the installation of squeezing doesn't finish in time

LCGT/Meeting/f2f/2019Aug/FuSat (last edited 2019-08-22 17:01:21 by SadakazuHaino)