Result of first test run of CLIO T

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 I. III. IV. Cryogenic Laser Interferometer Observatory First test run Influence of cryocooler Summary Dec. 18 2006 GWDAW 11 Potsdam Germany

1. Cryogenic Laser Interferometer Observatory (CLIO) Where is CLIO? Kamioka 220 km Tokyo (NAOJ) Construction started from 2003 spring. Dec. 18 2006 GWDAW 11 Potsdam Germany

1. Cryogenic Laser Interferometer Observatory (CLIO) Motivation of CLIO : Proto-Type for LCGT 1. 1. Reduction of thermal noise limiting sensitivity is targeted 2. using sapphire mirrors and sapphire suspension fibers. - Cooled sapphire mirrors around 20 K 1. 2. Stable operation is expected owing to the low seismic noise 2. of KAMOIKA mine. - Seismic noise at the Kamioka mine is 1/100 lower than that at a city area. CLIO operation using cryogenic mirrors was done Apr. 2006 ! Now Dec. 18 2006 CLIO is operated at room temperature for noise hunting. GWDAW 11 Potsdam Germany

1. Cryogenic Laser Interferometer Observatory (CLIO) Current best sensitivity Dec. 13 2006 Operation at room temperature Sensitivity Observable range (S/N=10) Frequency Calculation by T. Uchiyama and K. Yamamoto Dec. 18 2006 GWDAW 11 Potsdam Germany

1. Cryogenic Laser Interferometer Observatory (CLIO) Apparatus of CLIO Perpendicular Cryostat tank Inline Compressors cryocooler Graphic by S. Miyoki and revised by T. Akutsu Dec. 18 2006 GWDAW 11 Potsdam Germany

2. First test run for Data Taking Motivation of CLIO - Stable operation is expected owing to the low seismic noise of KAMOIKA mine. Cryocoolers Vibrations, Acoustic noise In the future, we would like to evaluate the data both, at 20 K and at room temperature. Cryostat tank Heat link Optical bench for PD Cryocooler Radiation shield 4 K cold head Dec. 18 2006 GWDAW 11 Potsdam Germany

2. First test run for Data Taking Cryocoolers (ultra low vibration type) Vibrations, Acoustic noise Sound level meter in the PD room Cryocooler switch on! Cryostat tank How does a cryocooler have influence on the feed back signal ? Heat link Optical bench for PD Cryocooler Radiation shield 4 K cold head Dec. 18 2006 GWDAW 11 Potsdam Germany A PD is near a cryostat tank

2. First test run for Data Taking First Data Taking Nov. 20 2006 Nov. 21 2006 1. 7 hours 5. 3 hours Without alignment control p Consecutive lock p Configuration at the present BOLFUR suspension wires No heat link Room temperature Sensitivity at data taking Observable range (S/N=10) 49 kpc at best sensitivity Calculation by T. Uchiyama and K. Yamamoto Data taken on Nov. 20 2006 was used in this work Dec. 18 2006 GWDAW 11 Potsdam Germany

3. Contamination of cryocooler Influence on noise level Fluctuation of sensitivity Histogram of fluctuation Apparently, it seems that acoustic noise does not influence the data so much. Dec. 18 2006 GWDAW 11 Potsdam Germany

3. Contamination of cryocooler Influence on burst-like noise In order to search the effect of burst-like noise, we used a slope filter (P. R. D 63 042002). Time of analyzed data • Switch off 39 min. • Switch on 15 min. Evaluation of hrss : A&A 393 523 (2002) No remarkable difference between on and off of the refrigerator. Dec. 18 2006 GWDAW 11 Potsdam Germany

3. Contamination of cryocooler Do cryocoolers really have any influences for the data? Observable Range 1. 4 Msol-1. 4 Msol (S/N=10) Nov. 20 2006 car Dec. 18 2006 Cryocooler on GWDAW 11 Potsdam Germany unlock

3. Contamination of cryocooler Do cryocooler really have any influence for the data? Histogram for observable distance mean std Switch off 34. 22 kpc 2. 27 Switch on 32. 38 kpc 2. 48 Cryocoolers have an affect on the data. PDs and its beam guiding optics will be installed in a vacuum tank in January 2007! Acoustic influence would be much reduced. Dec. 18 2006 GWDAW 11 Potsdam Germany

Summary p CLIO Demonstration of the cryogenic operation was done Apr. 2006. Present operation is at room temperature for noise hunting. p Data Taking First test run was implemented on Nov. 20 -21 2006. p 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 GWDAW 11 Potsdam Germany

Appendix Seismic noise level at Kamioka site and Mitaka site 1/100 -1/1000 Dec. 18 2006 GWDAW 11 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 GWDAW 11 Potsdam Germany

1 st Targeted Displacement Noise Laser power : 200 m. W for one arm Mirror Mass : 1. 8 kg Thermal Noises limit the sensitivity around 100 Hz, and they will be reduced after cooling. Dec. 18 2006 GWDAW 11 Potsdam Germany

Low Vibration Refrigerator - outlook - Dec. 18 2006 GWDAW 11 Potsdam Germany

Ultra-Low Vibration Refrigerator - vibration reduction performance Vibration of the 4 K vibration reduction stage in time. X-axis Y-axis Vibration on the 300 K stage in the Cryostat in the KAMIOKA mine Z-axis The values show mainly the operation frequency vibration. Dec. 18 2006 GWDAW 11 Potsdam Germany

Cryostat - outlook - Dec. 18 2006 GWDAW 11 Potsdam Germany

Appendix 80 -180 off on 400 -500 off on 1100 -1200 off on 1800 -1900 off on Dec. 18 2006 GWDAW 11 Potsdam Germany mean 2. 88 e-18 2. 93 e-18 7. 58 e-18 8. 19 e-18 9. 92 e-19 1. 05 e-20 1. 54 e-18 1. 53 e-18 std 2. 72 e-20 5. 86 e-20 9. 79 e-20 1. 32 e-20 6. 58 e-20 6. 38 e-20 9. 45 e-20 1. 02 e-20

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 (average root-mean-square ) Cryocooler switch on! average root-mean-square Acceleration meter under a cryostat tank Cryocooler switch on! How does it have influence for the data quality ? Dec. 18 2006 GWDAW 11 Potsdam Germany

Appendix Observable range Dec. 18 2006 GWDAW 11 Potsdam Germany