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