• KAGRA
• Commissioning
• Phase1
• Operation
• MeasurementsSummary

Summary of Phase 1 Measurements

• Summary of Phase 1 measurements for bKAGRA Phase 1 paper.

Basic configurations

• input power
• power at detection RF PD

  • Reflection from one end mirror 0.20 mW (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4876)

  • At dark fringe 56 +/- 10 uW (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4903)

  • signal chain (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4920)

• modulation frequency, modulation depth

  • 16.87293 MHz (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4831)

  • beta = 0.12 (from error signal amplitude), 0.2 (from RF power applied to EOM) (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4876 , http://klog.icrr.u-tokyo.ac.jp/osl/?r=4907)

• vacuum level
• suspension and coil driver configurations (difference between the final configuration)

Michelson initial alignment

• details of slit method

• Tcam and baffle PD performance (details-> Tcam paper)

  • time delay, resolution ...
  • succeefully monitored the beam under cryo baffles/shields

Installation accuracy

• Schunupp asymmetry measurement
• IMC length measurement

  • 53.30299(2) m (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4831)

Cryogenics

• cooling curve (details -> CRY paper)

• alignment drift during the cool down

Suspension characterization

• length actuation efficiency measurements for BS, comparison with expectations

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4811

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4909

• length actuation efficiency measurements for ETMX and Y, comparison with expectations

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4898

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4899

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4919

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4925

• seismic attenuation ratio measurements for ETMY and Y

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4927

• TF difference between ETMX and ETMY (room temperature and cryogenic)
• vertical to length coupling, other coupling measurements

Sensitivity and stability

• actuation efficiency drift
• alignment drift of suspensions
• visibility and optical gain drift

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4775

• sensitivity stability, duty factor, lock duration (similar plots in https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5177)

• Noise budget

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4834

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4910

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4944

• magnetic and acoustic noise from PEM injection (details -> PEM paper?)

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4891

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4933

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4871

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4940

Seismic noise, arm length drift

• seismic spectra stability (similar plots in https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2971)

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=4942

• differential seismic noise measured by Michelson (3-km CMRR)
• differential arm length drift, correlation between GIF-X