Differences between revisions 15 and 23 (spanning 8 versions)

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)
- BS IM and TM use high power coil drivers instead of low power.
- ETMY MN, TM, and TM use high power coil drivers instead of low power.
- ETMX MN and IM V1/2 use high power coil drivers instead of low power. From May 4 or 5, IM H1/2/3,V3 also uses high power.

Michelson initial alignment

details of slit method
- slit size ~10mm, at C chamber first, and then A chamber
- http://klog.icrr.u-tokyo.ac.jp/osl/?r=3848
Tcam and baffle PD performance (details-> Tcam paper)
- Tcam update frequency ~1sec, resolution [Inoue]
- Tcam resolution?
- successfully monitored the beam under cryo baffles/shields

Installation accuracy

Schunupp asymmetry measurement
- http://klog.icrr.u-tokyo.ac.jp/osl/?r=4949
- http://klog.icrr.u-tokyo.ac.jp/osl/?r=4960
IMC length measurement
- 53.30299(2) m (http://klog.icrr.u-tokyo.ac.jp/osl/?r=4831)

Cryogenics

cooling curve (details -> CRY paper) [Hasegawa?]
- Platform, MN, IM, TM, shields
alignment drift, height change during the cool down
- height change [Inoue]
- not much info for alignment drift. O(100)urad in yaw [Izumi]
- http://klog.icrr.u-tokyo.ac.jp/osl/?r=4176

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
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
- for BS [Fujii]

Sensitivity and stability

actuation efficiency drift [Yamamoto]
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)
- duty factor
  - Total: 68.65%
  - 4/28: 81.66%
  - 4/29: 97.00%
  - 4/30: 90.36%
  - 5/01: 87.09%
  - 5/02: 86.88%
  - 5/03: 19.97%
  - 5/04: 33.58%
  - 5/05: 64.18%
  - 5/06: 55.36%
Noise budget
magnetic and acoustic noise from PEM injection (details -> PEM paper?)
Earthquake in Hawaii 2018-05-04 22:32:55 (UTC)
- difference between iKAGRA and Phase-1?
  - ETMY takes ~2-3 hours to damp enough for locking. ETMX takes ~1 hour.
- http://klog.icrr.u-tokyo.ac.jp/osl/?r=4948
- http://klog.icrr.u-tokyo.ac.jp/osl/?r=4955

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), GIF-X (1.5-km CMRR), IMC (26.65-m CMRR)
- CMRR measurement with 3-km Michelson would be difficult
- IMC CMRR [Nakano]
differential arm length drift, correlation between GIF-X

Hardware injection test

CBC injection(2018/4/30 Night shift)
CW injection(2018/5/2 Night shift)
- CW Injection

KAGRA/Commissioning/Phase1/Operation/MeasurementsSummary (last edited 2018-10-01 20:39:54 by YutaMichimura)

-  ⇤ ← Revision 15 as of 2018-05-07 10:13:18 → 
  Size: 3860
  Editor: YutaMichimura
  Comment:
+   ← Revision 23 as of 2018-05-07 15:13:15 → ⇥
  Size: 4862
  Editor: YutaMichimura
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 14:
+  * http://klog.icrr.u-tokyo.ac.jp/osl/?r=4487
  * http://klog.icrr.u-tokyo.ac.jp/osl/?r=4489
  * http://klog.icrr.u-tokyo.ac.jp/osl/?r=4527
-Line 15:
+Line 18:
+  * BS IM and TM use high power coil drivers instead of low power.
  * ETMY MN, TM, and TM use high power coil drivers instead of low power.
  * ETMX MN and IM V1/2 use high power coil drivers instead of low power. From May 4 or 5, IM H1/2/3,V3 also uses high power.
-Line 18:
+Line 24:
+  * slit size ~10mm, at C chamber first, and then A chamber
  * http://klog.icrr.u-tokyo.ac.jp/osl/?r=3848
-Line 19:
+Line 27:
-  * time delay, resolution ...
  * succeefully monitored the beam under cryo baffles/shields
+  * Tcam update frequency ~1sec, resolution [Inoue]
  * Tcam resolution?
  * successfully monitored the beam under cryo baffles/shields
-Line 30:
+Line 39:
- * cooling curve (details -> CRY paper)
 * alignment drift during the cool down
+ * cooling curve (details -> CRY paper) [Hasegawa?]
  * Platform, MN, IM, TM, shields
 * alignment drift, height change during the cool down
  * height change [Inoue]
  * not much info for alignment drift. O(100)urad in yaw [Izumi]
  * http://klog.icrr.u-tokyo.ac.jp/osl/?r=4176
-Line 46:
+Line 59:
+  * for BS [Fujii]
-Line 48:
+Line 62:
- * actuation efficiency drift
+ * actuation efficiency drift [Yamamoto]
-Line 76:
+Line 90:
+   * ETMY takes ~2-3 hours to damp enough for locking. ETMX takes ~1 hour.
-Line 82:
+Line 97:
- * differential seismic noise measured by Michelson (3-km CMRR)
+ * differential seismic noise measured by Michelson (3-km CMRR), GIF-X (1.5-km CMRR), IMC (26.65-m CMRR)
  * CMRR measurement with 3-km Michelson would be difficult
  * IMC CMRR [Nakano]