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 * [[KAGRA/Commissioning/Phase1/Operation/MeasurementsSummary|Phase-1 Measurements Summary]]  * [[KAGRA/Commissioning/Phase1/Operation/MeasurementsSummary|Phase 1 Measurements Summary]]
See following pages for some design parameters
 * [[KAGRA/Subgroups/IOO/OptParam|IOO related]]
 * [[KAGRA/Subgroups/IOO/OptParam|MIF related]]

== RF Sidebands ==
 * f1 frequency
 * f2 frequency
 * f1 modulation depth
 * f2 modulation depth
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 * Round-trip length
  * '''Design''': 53.28708 m (FSR of 5.6269873 MHz)
  * '''Measured''': 53.302985(9) m B)
  * '''Measurement method''': FSR was measured to be 5.624308(1) MHz. https://klog.icrr.u-tokyo.ac.jp/osl/?r=4831
  * '''Notes''': Measured on April 2018. Any re-installation after this?
 * Finesse
  * '''Design''': ~500
  * '''Measured''': 409
  * '''Measurement method''': Cavity pole was measured to be 6.86(2) kHz. https://klog.icrr.u-tokyo.ac.jp/osl/?r=14569
  * '''Notes''': Lower than iKAGRA measurement of 540+/-70 http://klog.icrr.u-tokyo.ac.jp/osl/?r=618 Degraded? :o
 * Mode-match
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
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 * X-arm length
  * '''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
  * '''Notes''':
 * X-arm finesse for IR
  * '''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
 * X-arm round-trip loss
  * '''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
 * X-arm mode-match
  * '''Measured''': 91(1)%
  * '''Measurement method''': Cavity scan https://klog.icrr.u-tokyo.ac.jp/osl/?r=7307
  * '''Notes''':
 * X-arm finesse for green
  * '''Design''': 51
  * '''Measured''': 41(2)
  * '''Measurement method''': Calculated from reflectivity measurements by Hirose-san
  * '''Notes''':
 * Y-arm length
  * '''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
  * '''Notes''':
 * Y-arm finesse for IR
  * '''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
 * Y-arm round-trip loss
  * '''Design''': 100 ppm
  * '''Measured''': NOT YET MEASURED? :o
  * '''Measurement method''':
  * '''Notes''':
 * Y-arm mode-match
  * '''Measured''': 87(2) %
  * '''Measurement method''': Cavity scan https://klog.icrr.u-tokyo.ac.jp/osl/?r=9505
  * '''Notes''':
 * Y-arm finesse for green
  * '''Design''': 51
  * '''Measured''': 53(3)
  * '''Measurement method''': Calculated from reflectivity measurements by Hirose-san
  * '''Notes''':
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 * PRX length
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * PRY length
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * PRC Gouy phase
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
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 * SRX length
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * SRY length
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * SRC Gouy phase
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
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 * Schnupp asymmetry
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
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 * Power recycling gain
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
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 * 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:
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 * Round-trip length
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * Finesse
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':

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)