Development of the accelerometer for cryogenic experiments II

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1 Development of the accelerometer for cryogenic experiments II ICRR Univ. of Tokyo, KEK A, Dept. of advanced materials science Univ. of Tokyo B K. Yamamoto, H. Hayakawa, T. Uchiyama, S. Miyoki, H. Ishitsuka, M. Ohashi, K. Kuroda, T. Tomaru A, S. Moriwaki B 2004 March 30 The meeting of Physical Society of University

2 0. Abstract Current status of the development of the accelerometer for cryogenic experiments (LCGT and CLIO project)

3 Contents 1. Introduction 2. Outline of experiment 3. Results 4. Future works 5. Summary

4 1. Introduction LCGT and CLIO : future and current Japanese project to construct the interferometric gravitational wave detector Cryogenic interferometer (20 K) : reduction of thermal noise Heat absorption in the mirrors : about 1 W in LCGT mirror (20 K) heat conductor heat transfer mechanical vibration thermal anchor (4 K)

5 Schematic view of cryogenic apparatus Intermediate mass (10 K) Mirror (20 K) Vacuum chamber (300 K) Outer shield (40 K) Inner shield (4 K) Refrigerator (4 K) Vibration isolation for shield is difficult! Resonant frequencies of shield : 10 Hz Hz X shield > X seismic X shield Measurement is necessary. Accelerometer at low temperature

6 2. Outline of Experiment 2-1. Outline of accelerometer (i) free mass : reference (ii) sensor : displacement between free mass and shield sensor shield free mass force (iii) actuator : feedback actuator Mass follows shield. acceleration Acceleration of shield is derived from feedback signal. Horizontal and vertical vibration measurement Only horizontal vibration in this talk

7 2-2. Components of accelerometer (i) free mass : mechanical harmonic oscillator 20 mm material : phosphor bronze resonant frequency : 20 Hz 0.3 mm thickness 2 mm width (ii) sensor : Michelson interferometer (calibration) (iii) actuator : coil-magnet actuator (operation at low temperature)

8 2-3. Schematic view of accelerometer Laser source (diode) 635 nm Steering mirror RM(on shield) BS Oscillator (on shield) Vacuum chamber and radiation shield 5 mw PD PD Output Size of interferometer : 145 mm * 145 mm + Differential amp Filter

9 Interferometer 145 mm PD BS Reference mirror Oscillator PD Coil

10 2-4. Schematic view of cryostat CLIK end tank (ICRR, Kashiwa) Vacuum chamber Outer shield (40K) Inner shield (4K) Interferometer Laser source Optical table PD

11 Cryostat (CLIK end tank) Cryostat 1 m Optical table

12 2-5. Refrigerator and vacuum pump (i) Refrigerator of CLIK : 4 K 2 stage Gifford-McMahon Large vibration Refrigerator of CLIO : 4 K 2 stage Pulse-tube Small vibration (Talk of T. Suzuki) (ii) Vacuum pump : Rotary pump and Turbo-molecular pump

13 Refrigerator and vacuum pump Cryostat Turbo-molecular pump Gifford-McMahon refrigerator Rotary pump

14 3. Results 3-1. Operation at room temperature (1) (Operation check) Comparison with RION accelerometer in air Seismic motion [m/hz 1/2 ] Seismic motion in cryostat (CLIK end:2004/3/3) Interferometer RION consistent (0.2 Hz Hz) Frequency [Hz]

15 3-2. Operation at room temperature (2) (Cryostat vs optical table) Hz : about same 30 Hz -100 Hz : larger motion in cryostat 100 Hz - : better sound isolation in cryostat Seismic motion [m/hz 1/2 ] Seismic motion CLIK end:pump off (2004/3/13) optical table (2004/2/21) Frequency [Hz]

16 3-3. Operation at room temperature (3) (Effect of pump vibration) 10-5 Peaks , 50, 100, 300 Hz Rotary pump Floor level no change Seismic motion [m/hz 1/2 ] Seismic motion in cryostat (CLIK end:2004/3/13) Pump on Pump off Frequency [Hz]

17 3-4. operation at low temperature Problems (i) Unlock : Gifford-McMahon refrigerator causes large vibration. (ii) Fringe was lost.

18 3-4. operation at low temperature Problems (i) Unlock : Gifford-McMahon refrigerator causes large vibration. (ii) Fringe was lost. Mirror of oscillator dropped! There are no other problems.

19 4. Future works (1) Measurement at low temperature in Kashiwa (CLIK) (2) Measurement of vertical vibration in Kashiwa (CLIK) 2004 May? : Cryogenic parts of CLIO project will be installed in Kamioka mine. (3) Measurement in CLIO cryostat in Kamioka mine

20 Cryostat of CLIO interferometer

21 5. Summary (1) Development of the accelerometer for cryogenic interferometer (LCGT and CLIO)... (2) Operation at room temperature : no serious problems and some results (3) Operation at low temperature : some problems (4) Future works : operation at low temperature measurement in CLIO cryostat

22 Seismic motion [m/hz 1/2 ] Interferometer noise Interferometer noise (2004/3/11) Kamioka Frequency [Hz]

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