Online Log
The 1st. shift [31 Aug. 23:00 - 1 Sep. 7:00]
Core: S. Sato, Sub: D. Tatsumi
[Date 31 Aug. Time 20 : 04 #HDAQ 118 R. Takahashi ]
Start adjustment of the interferometer.
[Date 31 Aug. Time 21 : 00 #HDAQ 1424 S. Sato ]
IFO was tuned, IFO noise was measured for hdaq data check.
[Date 31 Aug. Time 21 : 17 #HDAQ 1440 S. Sato ]
We have LIVE event at Tokyo stadium next NAOJ tonight!!! (;_;)
[Date 31 Aug. Time 22 : 49 #HDAQ 1523 R. Takahashi ]
EM1 position: -27
[Date 31 Aug. Time 23 : 00 #HDAQ 1535 S. Sato ]
We start Data Taking 7 from 23:00 JST.
DT7 is coincident observation with LIGO and GEO.
Hope we can get fruitful data set for international coincident observation.
[Date 1 Sep. Time 00 : 20 #HDAQ 1606 S. Sato ]
Continuous lock time exceeded 3h30m, and feed back of ASC (NM1-Yaw) is getting bigger.
But contrast and IFO sensitivity keep good level or slightly getting better, so we will do no maintenance of IFO for this lock.
[Date 1 Sep. Time 1 : 00 #HDAQ 1645 D. Tatsumi ]
Sato: Start Re-alignment and some adjustments
[Date 1 Sep. Time 01 : 00 #HDAQ 1645 S. Sato ]
IFO maintenance for ASC
Alignment of arm-ASC (Reduced feed back voltage of arm-ASCs)
Alignment of RM (Best tuning for maxmum power build-up inside RM cavity)
**IFO Lock was not lost***
Total lock time (NOT observational time) exceeded 5h!
[Date 1 Sep. Time 01 : 30 #HDAQ 1645 S. Sato ]
Cause of ASC drift
*Beam pointing to main IFO has gone to downward (Pitch direction)
[Date 1 Sep. Time 02 : 40 #HDAQ 1733 S. Sato ]
Information for core-shifts, typical IFO parameters on online monitor
*WE transmission:2.2V
*NS transmission:2.5V
*MC transmission:1.05V
*Contrast:0.99-0.98
*Dark power:0.7V (flour0.6-upto max1.5)
*Openloop:G1.722,P31.9degree
*NoiseLevel(935Hz):1.3e-21 (on online-analysis display!)
*Excess:flour0-upto overrange, with many forest
[Date 1 Sep. Time 02 : 55 #HDAQ 1749 S. Sato ]
Continuous lock time exceeded 6h.
[Date 1 Sep. Time 03 : 40 #HDAQ 1791 S. Sato ]
Continuous lock time exceeded 7h.
[Date 1 Sep. Time 04 : 05 #HDAQ 1813 S. Sato ]
IFO maintenance for ASC
Alignment of arm-ASC (Reduced feed back voltage of arm-ASCs)
Alignment of RM (Best tuning for maxmum power build-up inside RM cavity)
**IFO Lock was not lost***
[Date 1 Sep. Time 04 : 50 #HDAQ 1860 S. Sato ]
IFO sensitivity was measured using error point noise.
[Date 1 Sep. Time 05 : 17 #HDAQ 1878 S. Sato ]
IFO lock lost
*Countinuous lock time was 8h37m!!*
[Date 1 Sep. Time 05 : 23 #HDAQ 1888 S. Sato ]
IFO lock acquired
[Date 1 Sep. Time 05 : 28 #HDAQ 1889 S. Sato ]
Impulsive noise was found on L- signal, typically one pulse in one minute.
->This cause spectrum degradation in a few hundred Hz region, inevitable
->We tried re-tuning of actuator balance of ITMs, but not improved
->Centering of ETMs were not so bad
->Reson unknown
->Accidentally lock was lost from MC at 05:17
->IFO was recoverd and impulsive noise disappeared!
[Date 1 Sep. Time 06 : 20 #HDAQ 1937 S. Sato ]
Information for core-shifts, typical IFO parameters on online monitor
*WE transmission:2.2V
*NS transmission:2.5V
*MC transmission:1.05V
*Contrast:0.99-0.98
*Dark power:0.8V (flour0.6-upto max1.5)
*Openloop:G1.726,P32.1degree
*NoiseLevel(935Hz):3.6e-21 (on online-analysis display!)
*Excess:flour-0.2-upto overrange, with typically one burst in 10 min.
***Excess was improved largely by IFO re-lock ***
[Date 1 Sep. Time 06 : 41 #HDAQ 1956 S. Sato ]
Noise flour of L- was degraded again
->No apparent spikes in time series data
->Reason why???
->Reduced ASC gain from 010 to 008 all
->Improved!
->Possible story; misalignment of RM was fed back to arm TMs?