Differences between revisions 8 and 10 (spanning 2 versions)
Revision 8 as of 2021-02-26 22:19:22
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Revision 10 as of 2021-02-26 22:39:45
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  * '''Notes''': Lower than iKAGRA measurement of 540+/-70 http://klog.icrr.u-tokyo.ac.jp/osl/?r=618   * '''Notes''': Lower than iKAGRA measurement of 540+/-70 http://klog.icrr.u-tokyo.ac.jp/osl/?r=618 Degraded? :o
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  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Design''': 3000 m
  * '''Measured''': 2999.990(2) m B)
  * '''Measurement method''': Cavity scan FSR = 49.96557(4) kHz http://klog.icrr.u-tokyo.ac.jp/osl/?r=7332
  * '''Notes''':
 * X-arm Gouy phase
  * '''Design''': 250.75 deg
  * '''Measured''': 250.7(3) deg
  * '''Measurement method''': Cavity scan TMS=34.79(5) kHz http://klog.icrr.u-tokyo.ac.jp/osl/?r=7332
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  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
  * '''Design''': 1530
  * '''Measured''': 1410(30)
  * '''Measurement method''': Ring down
  * '''Notes''': There is temperature dependence due to frosting :o https://klog.icrr.u-tokyo.ac.jp/osl/?r=10033
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  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
  * '''Design''': 100 ppm
  * '''Measured''': 86(3) ppm
  * '''Measurement method''': From reflectivity change in locked and unlocked https://klog.icrr.u-tokyo.ac.jp/osl/?r=7307
  * '''Notes''': The estimate might be wrong due to birefringence https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11633 :o
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  * '''Measured''':
  * '''Measurement method''':
  * '''Measured''': 91(1)%
  * '''Measurement method''': Cavity scan https://klog.icrr.u-tokyo.ac.jp/osl/?r=7307
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  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Design''': 51
  * '''Measured''': 41(2)
  * '''Measurement method''': Calculated from reflectivity measurements by Hirose-san
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  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Design''': 3000 m
  * '''Measured''': 3000.015(1) m B)
  * '''Measurement method''': Cavity scan, FSR = 49.96517(2) kHz https://klog.icrr.u-tokyo.ac.jp/osl/?r=9505
  * '''Notes''':
 * Y-arm Gouy phase
  * '''Design''': 250.75 deg
  * '''Measured''': 250.9(3) deg
  * '''Measurement method''': Cavity scan, TMS = 34.82(5) kHz https://klog.icrr.u-tokyo.ac.jp/osl/?r=9505
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  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
  * '''Design''': 1530
  * '''Measured''': 1320(30)
  * '''Measurement method''': Ring down, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9052, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9211, http://klog.icrr.u- tokyo.ac.jp/osl/?r=9496
  * '''Notes''': There is temperature dependence due to frosting :o https://klog.icrr.u-tokyo.ac.jp/osl/?r=10033
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  * '''Design''':   * '''Design''': 100 ppm
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  * '''Measured''':
  * '''Measurement method''':
  * '''Measured''': 87(2) %
  * '''Measurement method''': Cavity scan https://klog.icrr.u-tokyo.ac.jp/osl/?r=9505
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  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Design''': 51
  * '''Measured''': 53(3)
  * '''Measurement method''': Calculated from reflectivity measurements by Hirose-san

Optical Characterization

This page is intended for summarizing the interferometer optical characterization results and discussions. See following pages and documents for iKAGRA and bKAGRA Phase-1 characterization summary:

See following pages for some design parameters

RF Sidebands

  • f1 frequency
  • f2 frequency
  • f1 modulation depth
  • f2 modulation depth

Input Mode Cleaner

Arm Cavities

Power Recycling Cavity

  • PRX length
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

  • PRY length
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

  • PRC Gouy phase
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

Signal Recycling Cavity

  • SRX length
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

  • SRY length
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

  • SRC Gouy phase
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

Michelson

  • Schnupp asymmetry
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

Dual Recycled Michelson

  • Power recycling gain
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

Power Recycled Fabry-Perot Michelson

  • Power recycling gain
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

  • Power at each ISC detection ports when locked
    • REFL:
    • POP p-pol:
    • POP s-pol:
    • POS p-pol:
    • POS s-pol:
    • AS RF:
    • OMC REFL:
    • OMC TRANS:
    • TRX:
    • TRY:

Output Mode Cleaner

  • Round-trip length
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

  • Finesse
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

KAGRA/Subgroups/MIF/OpticalCharacterization (last edited 2021-08-11 16:03:32 by YutaMichimura)