Vibration measurement in the cryogenic interferometric gravitational wave detector (CLIO interferometer) ICRR Univ. of Tokyo, Dept. of geophysics Kyoto University A , KEK B , Dept. of advanced materials science Univ. of Tokyo C , Sumitomo Heavy Industries Ltd. D K. Yamamoto , T. Uchiyama, S. Miyoki, M. Ohashi, K. Kuroda, H. Hayakawa A , T. Tomaru B , N. Sato B , T. Suzuki B , T. Haruyama B , A. Yamamoto B , T. Shintomi B , S. Moriwaki C , Y. Ikushima D , T. Koyama D , R. Li D 2006 March 28 The meeting of Physical Society of Japan @Matsuyama University
51
Embed
Vibration measurement in the cryogenic …...Vibration measurement in the cryogenic interferometric gravitational wave detector (CLIO interferometer) ICRR Univ. of Tokyo, Dept. of
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Vibration measurement in the cryogenic interferometric gravitational wave detector (CLIO interferometer)
ICRR Univ. of Tokyo, Dept. of geophysics Kyoto UniversityA,KEKB, Dept. of advanced materials science Univ. of TokyoC,Sumitomo Heavy Industries Ltd.D
K. Yamamoto, T. Uchiyama, S. Miyoki, M. Ohashi, K. Kuroda,H. HayakawaA, T. TomaruB, N. SatoB, T. SuzukiB, T. HaruyamaB,A. YamamotoB, T. ShintomiB, S. MoriwakiC, Y. IkushimaD,T. KoyamaD, R. LiD
2006 March 28 The meeting of Physical Society of Japan @Matsuyama University
0. Abstract
Measurement of the vibration
at the top of suspension and inner shield of CLIO interferometer
Contents
1. Introduction
2. Outline of experiment
3. Results
4. Future works
5. Summary
1. Introduction
LCGT and CLIO : future and current Japanese project
to construct the interferometric gravitational wave detector
(1) Cryogenic interferometer (20 K) : reduction of thermal noise
(2) Kamioka mine : small seismic noise Cryocooler
Vibration
Measurement of vibration with operating cryocooler is necessary.
Schematic view of cryogenic apparatus Vacuum chamber (300 K)
Outer shield (100 K)
Inner shield (8 K)
Mirror (20 K)
Intermediate mass (10 K)
X
Cryocooler (4 K)
(1)Top of suspension (300 K)
(2)Shield (8 K)
Measurement point
(1)Top of suspension (300 K, vacuum) (2)Shield(8K, vacuum)
Heat link
CLIO cryostatin Kamioka mine
Kamioka mine (LCGT,CLIO site)220km west from Tokyo
Tokyo (TAMA)
Kamioka220km
2. Outline of experiment
We are here.
2-1. Location
80K Pulse tubecryocooler
Beam splitter(100m ahead)
Gifford-McMahon refrigerator(removal)
by T. Uchiyama
ShieldCompressor
Mirror
Top of suspension(room temperature, vacuum, 1.9 m from floor, support of four poles)
4K Pulse tubecryocooler
Pulse tube cryocooler : extremely small vibration(developed by KEK and Sumitomo Heavy Industries Ltd.)Class. Quantum Grav. 21(2004)S1005.
2-2. Cryostat of CLIO interferometer (end)
Inner shield(low temperature, vacuum, 0.6 m from floor, support of G10 rods)
Cryostat of CLIO interferometer
Top roof
Door
Top of suspension
Cryostat of CLIO interferometer
Top roof
Door
Inner shield
Bottom of shield
Duct
BeamSplitter(fixed)
Lasersource(diode)
PhotoDetector
Differential amp Filter
ReferenceMirror(fixed)
Steeringmirror
+
Vacuum chamber
Output
Oscillator
2-3. Accelerometer
5 mW
635 nm
(Laser source and photo detectors are in vacuum chamber. Sound does not affect accelerometer directly.)
PhotoDetector
Only room temperature
Observation band
< 400 Hz (horizontal)< 250 Hz (vertical)
Accelerometer
Laser source
Photo detectors
Coil
BeamSplitter
Oscillator
Referencemirror
145 mm
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
Dis
plac
emen
t [m
/Hz1/
2 ]
0.1 1 10 100 1000
Frequency [Hz]
10 / [m/Hz ]
-9 2f1/2
Top of suspension(Horizontal) Pulse,pump on
(2005/3/10:first) Pump on
(2005/3/10:second) Off
(2005/2/3:second) Kashiwa
(2004/8/6:second)
3. Results
(Horizontal:optical axis)
< 200 HzCryocoolers and pump
not increasedovibration.
Vertical : similar
3-1. Top of suspension
> 200 HzCryocoolers and pump
increase vibration.
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
Dis
plac
emen
t [m
/Hz1/
2 ]
0.1 1 10 100 1000
Frequency [Hz]
10 / [m/Hz ]
-9 2f1/2
Shield (Horizontal) Pulse on
(2005/10/6) Pump on
(2005/10/5) Off
(2005/10/4) Kashiwa
(2004/8/6:second)
(Horizontal:optical axis)
Cryocoolers and pumpsnot increasedo
vibration.
3-2. Inner shield
G10 rods > 200 Hz
vibration isolation
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
Dis
plac
emen
t [m
/Hz1/
2 ]
0.1 1 10 100 1000
Frequency [Hz]
10 / [m/Hz ]-9 2f 1/2
Shield (Vertical) Pulse on
(2005/10/13:second) Pump on
(2005/10/13:first) Off
(2005/10/12) Kashiwa
(2004/8/16:first)
Cryocoolers : peaks
3-3. Inner shield (Vertical)
G10 rods
Vacuum pumpsincrease vibration.
> 200 Hz
vibration isolation
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
Dis
plac
emen
t [m
/Hz1/
2 ]
0.1 1 10 100 1000
Frequency [Hz]
10 / [m/Hz ]
-9 2f1/2
Horizontal motion Top of suspension
(2005/2/3:second) Inner shield
(2005/10/4:first) Floor (RION)
(Perpendicular end 2005/5/10)
Kashiwa (2004/8/6:second)
(Horizontal:Optical axis)
: 30 Hz
3-4. Comparison with floor
Suspension toppeak
Inner shield
Floor 10 / f [m/Hz ]-9 2 1/2
10 Hz - 200 Hz100 times
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
Dis
plac
emen
t [m
/Hz1/
2 ]
0.1 1 10 100 1000
Frequency [Hz]
10 / [m/Hz ]
-9 2f1/2
Vertical motion Top of suspension
(2005/6/8:first) Inner shield
(2005/10/12:first) Floor (RION)
(Inline end 2005/5/11)
Kashiwa (2004/8/16:first)
(Vertical)
: 30 Hz, 40 Hz
3-5. Comparison with floor
Suspension top
peak
Inner shield
Floor10 / f [m/Hz ]-9 2 1/2
10 Hz - 200 Hz10 times
10-21
10-20
10-19
10-18
10-17
10-16
10-15
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
Dis
plac
emen
t [m
/Hz1/
2 ]
100 101 102 103 104
Frequency [Hz]
by T. Uchiyama
Noise budget of CLIO From top of suspension From inner shield Shot noise Radiation pressure noise Standard quantum limit Thermal noise (mirror) Thermal noise (mirror at 300K)
3-6. Sensitivity of CLIO
External vibration doesnot limit sensitivityabove 40 Hz at 300 K.
< 40 Hz
Suspension topdominant
interferometer
above 60 Hz at 20 K.
4. Future works (For LCGT)
(1) Cryocooler : no serious problem
(2) Vacuum pump : some problems (inner shield, vertical motion)