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| * signal chain (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4920) | |
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| * succeefully monitored the beam under cryo baffles/shields | |
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| * alignment drift during the cool down | |
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| * visibility and optical gain drift (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4775) | * visibility and optical gain drift * http://klog.icrr.u-tokyo.ac.jp/osl/?r=4775 |
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| * http://klog.icrr.u-tokyo.ac.jp/osl/?r=4944 | |
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| * 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 |
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| * http://klog.icrr.u-tokyo.ac.jp/osl/?r=4942 |
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
- length actuation efficiency measurements for ETMX and Y, comparison with expectations
- seismic attenuation ratio measurements for ETMY and Y
- 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
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
magnetic and acoustic noise from PEM injection (details -> PEM paper?)
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)
- differential seismic noise measured by Michelson (3-km CMRR)
- differential arm length drift, correlation between GIF-X