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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]]
Check also [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4014|MIR Document and Drawings Tree]]

== RF Sidebands ==
 * f1 frequency: 16.8732705 MHz https://klog.icrr.u-tokyo.ac.jp/osl/?r=4831
 * f2 frequency: 44.995388 MHz https://klog.icrr.u-tokyo.ac.jp/osl/?r=4831
 * 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? Needs to be adjusted to match with PRC length.
 * Finesse
  * '''Design''': 520
  * '''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''': https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11633
  * '''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''': 68.2563 m (PRC length = 66.591 m)
  * '''Measured''': 68 m
  * '''Measurement method''': Using dnu/nu=dL/L https://klog.icrr.u-tokyo.ac.jp/osl/?r=14633
  * '''Notes''': Compare it with PRY.
 * PRY length
  * '''Design''': 64.9265 m
  * '''Measured''': 70.2 m
  * '''Measurement method''': Using dnu/nu=dL/L https://klog.icrr.u-tokyo.ac.jp/osl/?r=14565
  * '''Notes''': In consistent results between different methods and not compatible with Schnupp asymmetry measurement :o
 * PRC Gouy phase
  * '''Design''': 33.0 deg
  * '''Measured''': 31(1) deg
  * '''Measurement method''': Cavity scan with the inertia locking method http://klog.icrr.u-tokyo.ac.jp/osl/?r=9276
  * '''Notes''': After PR2 was moved. New measurement says 26.6 +/- 1.5 deg https://klog.icrr.u-tokyo.ac.jp/osl/?r=15179
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 * SRX length
  * '''Design''': 68.2563 m (SRC length = 66.591 m)
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * SRY length
  * '''Design''': 64.9265 m
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * SRC Gouy phase
  * '''Design''': 35.0
  * '''Measured''': 48(2) :o
  * '''Measurement method''': Cavity scan with the inertia locking method http://klog.icrr.u-tokyo.ac.jp/osl/?r=9246
  * '''Notes''': New measurement says 80.18 +/- 5.9 deg https://klog.icrr.u-tokyo.ac.jp/osl/?r=15179
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 * Schnupp asymmetry
  * '''Design''': 3.3299 m
  * '''Measured''': 3.36(1) m
  * '''Measurement method''': Demodulation phase difference in locking X-arm and Y-arm https://klog.icrr.u-tokyo.ac.jp/osl/?r=14575
  * '''Notes''': Not consistent with PRX and PRY measurements.
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 * Power recycling gain
  * '''Design''':
  * '''Measured''': ~3 :o
  * '''Measurement method''': REFERENCE TO BE ADDED
  * '''Notes''':
 * Power at each ISC detection ports when DRFPMI is locked
  * IMC output:
  * 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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 * Power recycling gain for carrier
  * '''Design''': 10
  * '''Measured''': 11-12
  * '''Measurement method''': REFERENCE TO BE ADDED
  * '''Notes''':
 * Power recycling gain for f1 sideband
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * Power recycling gain for f2 sideband
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * Power at each ISC detection ports when PRFPMI is locked
  * IMC output:
  * 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''': 1.5 m
  * '''Measured''': 2 * 0.717(2) m = 1.434(4) m
  * '''Measurement method''': Cavity scan FSR of 208.99(65) MHz https://klog.icrr.u-tokyo.ac.jp//?r=14696
  * '''Notes''':
 * Finesse
  * '''Design''': 780
  * '''Measured''': 616(62)
  * '''Measurement method''': Cavity scan https://klog.icrr.u-tokyo.ac.jp//?r=14696
  * '''Notes''':
 * AS mode content

== Sensing Matrix Measurements ==
 * LSC

 * ASC

== Optical Tables ==
I think we need a power budget here.

http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/IOO/OutputTables/Optics

POP table layout (Only cameras for POP s-pol and p-pol?) https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9623

POS table layout (DC PDs for POS s-pol and p-pol) https://klog.icrr.u-tokyo.ac.jp/osl/?r=14622

== Others ==
 * Laser intensity/frequency noise coupling
 * MICH/PRCL/SRCL to DARM coupling
 * MICH contrast defect
 * Type-A, B, Bp actuation efficiency measurements

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

Check also MIR Document and Drawings Tree

RF Sidebands

Input Mode Cleaner

Arm Cavities

Power Recycling Cavity

Signal Recycling Cavity

Michelson

  • Schnupp asymmetry

Dual Recycled Michelson

  • Power recycling gain
    • Design:

    • Measured: ~3 :o

    • Measurement method: REFERENCE TO BE ADDED

    • Notes:

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

Power Recycled Fabry-Perot Michelson

  • Power recycling gain for carrier
    • Design: 10

    • Measured: 11-12

    • Measurement method: REFERENCE TO BE ADDED

    • Notes:

  • Power recycling gain for f1 sideband
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

  • Power recycling gain for f2 sideband
    • Design:

    • Measured:

    • Measurement method:

    • Notes:

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

Output Mode Cleaner

Sensing Matrix Measurements

  • LSC
  • ASC

Optical Tables

I think we need a power budget here.

http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/IOO/OutputTables/Optics

POP table layout (Only cameras for POP s-pol and p-pol?) https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9623

POS table layout (DC PDs for POS s-pol and p-pol) https://klog.icrr.u-tokyo.ac.jp/osl/?r=14622

Others

  • Laser intensity/frequency noise coupling
  • MICH/PRCL/SRCL to DARM coupling
  • MICH contrast defect
  • Type-A, B, Bp actuation efficiency measurements

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