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Result of first test run of CLIO. T Akutsu 1 , S Telada 2 , T Uchiyama 1 , S Miyoki 1 , K Yamamoto 1 , M Ohashi 1 , K Kuroda 1 , N Kanda 3 and CLIO Collaboration. 1 ICRR, Univ. of Tokyo, 2 AIST, 3 OCU and CLIO Collaboration. Dec 18 2006 11 th GWDAW, Potsdam, Germany. Contents. - PowerPoint PPT Presentation
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Result of first test run ofResult of first test run of CLIOCLIO
T Akutsu1, S Telada2, T Uchiyama1, S Miyoki1, K Yamamoto1, M Ohashi1, K Kuroda1, N Kanda3 and CLIO
Collaboration.1 ICRR, Univ. of Tokyo, 2AIST, 3 OCU and CLIO Collaboration
Dec 18 2006 11th GWDAW, Potsdam, Germany
Dec.18 2006 GWDAW11 Potsdam Germany
Contents
I. Cryogenic Laser Interferometer Observatory II. First test runIII. Influence of cryocoolerIV. Summary
Dec.18 2006 GWDAW11 Potsdam Germany
1. Cryogenic Laser Interferometer Observatory (CLIO)
Where is CLIO?
Tokyo (NAOJ)
Kamioka
220km
Construction started from 2003 spring.
Dec.18 2006 GWDAW11 Potsdam Germany
1. Cryogenic Laser Interferometer Observatory (CLIO)
1. Reduction of thermal noise limiting sensitivity is targeted using sapphire mirrors and sapphire suspension fibers.
2. Stable operation is expected owing to the low seismic noise of KAMOIKA mine.
- Seismic noise at the Kamioka mine is 1/100 lower than that at a city area.
- Cooled sapphire mirrors around 20K
CLIO operation using cryogenic mirrors was done Apr.2006 !
CLIO is operated at room temperature for noise hunting.Now
Motivation of CLIO : Proto-Type for LCGT
Dec.18 2006 GWDAW11 Potsdam Germany
1. Cryogenic Laser Interferometer Observatory (CLIO)
Current best sensitivity
Observable range (S/N=10)
Dec.13 2006 Operation at room temperature
Sen
sitiv
ity
Frequency
Obs
erva
ble
rang
e
Calculation by T.Uchiyama and K.Yamamoto
Dec.18 2006 GWDAW11 Potsdam Germany
1. Cryogenic Laser Interferometer Observatory (CLIO)
Apparatus of CLIO
Compressors
Cryostat tank
Graphic by S.Miyoki and revised by T.Akutsu
cryocooler
Inline
Perpendicular
Dec.18 2006 GWDAW11 Potsdam Germany
Cryocooler
4K cold head
Heat link
Radiation shield
Optical bench for PD
Cryostat tank
2. First test run for Data Taking
Cryocoolers Vibrations, Acoustic noise
- Stable operation is expected owing to the low seismic noise of KAMOIKA mine.Motivation of CLIO
In the future, we would like to evaluate the data both, at 20K and at room temperature.
Dec.18 2006 GWDAW11 Potsdam Germany
Cryocooler
4K cold head
Heat link
Radiation shield
Optical bench for PD
Cryostat tank
2. First test run for Data TakingCryocoolers (ultra low vibration type)
Vibrations, Acoustic noise Sound level meter in the PD room
Cryocooler switch on!
How does a cryocooler have influence on the feed back signal ?
A PD is near a cryostat tank
Dec.18 2006 GWDAW11 Potsdam Germany
2. First test run for Data Taking
Calculation by T.Uchiyama and K.Yamamoto
Observable range (S/N=10)
Data taken on Nov.20 2006 was used in this work
First Data Taking
Sensitivity at data taking
49kpc at best sensitivity
Nov.20 2006 1.7 hoursNov.21 2006 5.3 hours
Without alignment control Consecutive lock
BOLFUR suspension wires No heat linkRoom temperature
Configuration at the present
Dec.18 2006 GWDAW11 Potsdam Germany
Fluctuation of sensitivity
Apparently, it seems that acoustic noise does not influence the data so much.
Influence on noise level
3. Contamination of cryocooler
Histogram of fluctuation
Dec.18 2006 GWDAW11 Potsdam Germany
3. Contamination of cryocooler
In order to search the effect of burst-like noise, we used a slope filter (P.R.D 63 042002).
Time of analyzed data
No remarkable difference between on and off of the refrigerator.
Influence on burst-like noise
• Switch off 39 min.• Switch on 15 min.
Evaluation of hrss : A&A 393 523 (2002)
Dec.18 2006 GWDAW11 Potsdam Germany
3. Contamination of cryocooler
Nov.20 2006
Observable Range 1.4Msol-1.4Msol (S/N=10)
Do cryocoolers really have any influences for the data?
Cryocooler oncar unlock
Dec.18 2006 GWDAW11 Potsdam Germany
3. Contamination of cryocooler
Histogram for observable distance
PDs and its beam guiding optics will be installed in a vacuum tank in January 2007!
Acoustic influence would be much reduced.
mean std
Switch off 34.22kpc 2.27
Switch on 32.38kpc 2.48
Do cryocooler really have any influence for the data?
Cryocoolers have an affect on the data.
Dec.18 2006 GWDAW11 Potsdam Germany
Summary CLIO Demonstration of the cryogenic operation was done Apr. 2006. Present operation is at room temperature for noise hunting.
Data Taking First test run was implemented on Nov. 20-21 2006.
Contamination of cryocooler - No remarkable influence as for burst noise. - A little influence for floor level by observable range. - More complete countermeasures for acoustic noise will be prepared.
Next schedule
Next data taking is planned on Jan. 2007 after some acoustic countermeasures.
Dec.18 2006 GWDAW11 Potsdam Germany
Appendix
Seismic noise level at Kamioka site and Mitaka site
1/100 -1/1000
Dec.18 2006 GWDAW11 Potsdam Germany
Appendix
-Difference between the seismic noise on the surface and in the ground of the isolated area is distinguishing above 1 Hz.
- Stable operation without alignment control is demonstrated for ?? hours.(Normally, GWDs on the ground without alignment control is impossible.)
Dec.18 2006 GWDAW11 Potsdam Germany
1st Targeted Displacement Noise
Thermal Noises limit the sensitivity around 100Hz, and they will be reduced after cooling.
Laser power :200mW for one armMirror Mass :1.8 kg
Dec.18 2006 GWDAW11 Potsdam Germany
Low Vibration Refrigerator- outlook -
Dec.18 2006 GWDAW11 Potsdam Germany
Ultra-Low Vibration Refrigerator- vibration reduction performance -
Vibration of the 4K vibration reduction stage in time.
Vibration on the 300K stage in the Cryostatin the KAMIOKA mine
X-axis Y-axis Z-axis
The values show mainly the operation frequency vibration.
Dec.18 2006 GWDAW11 Potsdam Germany
Cryostat - outlook -
Dec.18 2006 GWDAW11 Potsdam Germany
Appendix
mean std 80-180 off 2.88e-18 2.72e-20
on 2.93e-18 5.86e-20 400-500 off 7.58e-18 9.79e-20
on 8.19e-18 1.32e-201100-1200 off 9.92e-19 6.58e-20
on 1.05e-20 6.38e-201800-1900 off 1.54e-18 9.45e-20
on 1.53e-18 1.02e-20
Dec.18 2006 GWDAW11 Potsdam Germany
1. Cryogenic Laser Interferometer Observatory (CLIO)
The sounds caused by cryocoolers is loud although its system has low vibration .
Sound level meter in the PD room
Acceleration meter under a cryostat tank
Cryocooler switch on!
Cryocooler switch on!
How does it have influence for the data quality ?
average root-mean-square average root-mean-square average root-mean-square
T
dtVT 0
21ofn compressiologoutput (average root-mean-square )
Dec.18 2006 GWDAW11 Potsdam Germany
Appendix
Observable range