Gravitational Wave Detection
in Space in China
Yueliang Wu (UCAS)
presented by Gang JIN
Institute of Mechanics, CAS, Beijing 100190, P.R.China
On behalf of
Gravitational Wave Detection Working Group,
Chinese Academy of Sciences
10th LISA Symposium
Gainesville, Fl., May 19-23, 2014
Outline of Talk
 Road-map of Chinese Mission
 A preliminary mission design for China
and its scientific case study
 Brief Report on the status of ongoing
development for the space gravitational wave
detection program in CAS
Working Group
for Gravitational Wave Detection in Space, CAS
Coordinators:
 Yueliang Wu (University of Chinese Academy of Sciences)
 Wenrui Hu, Gang Jin (National Microgravity Laboratory, Institute of Mechanics )
Member Institutes participating in the group:
 Academy of Mathematics and Systems Science,
 Institute of Mechanics,
 Institute of Physics,
 Institute of Theoretical Physics,
 Institute of high Energy Physics,
 Nanjing Institute of Astronomy and Optics,
 National Astronomical Observatory,
 University of Chinese Academy of Sciences (UCAS)
 University of Science and Technology of China (USTC)
 Huazhong Univ. of Sci. & Tech.(HUST)
 Wuhan Institute of Physics and Mathematics
 Dongfanghong Satellite Co. Ltd
Roadmap of Chinese Mission
Dual Tracks of Development
Develop a Chinese Mission
eGRACE as Application
(evolving/extended/enlarged)
earth Gravity Recovery And Climate
Experiment
GWD-China
Gravitational Wave Detection in China
Contribute 20% to eLISA
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Telescope,
part of inertial sensors,
optical bench,
Phasemeter,
escape orbit launcher,
others ...
Roadmap of Chinese Mission
eGRACE (100 nm, 2013-2022)
Temporal variation of earth gravity field
and Test for main techniques of GWD
GWD-China (5pm,2013-2033)
Space detection of GW
Road-map of Chinese Mission
eGRACE Mission (2013-2022)
2013-2015：eGRACE expound & prove
• Science & application purpose
• Technology research & development
• Satellite platform
2016-2022：eGRACE design and launch
Technology development and Engineering:
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Laser interferometer;
Inertial sensors;
Drag free control;
Accelerometer response;
Satellite task analysis and simulation
Data analysis and gravity inversion method
Roadmap of Chinese Mission
GWD-China Mission (2013-2033)
2013-2015：GWD-China preliminary mission design
• Science purpose & Technology target
• Dual Tracks of development &
• Preliminary decision making
2016-2022： GWD-China mission expound & prove or
prepare for contributing 20% to eLISA
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Key technology research & development;
Science measurement study;
Theoretical study;
Data analysis;
Satellite platform simulation;
Chinese Mission Study for GWD-China or
20% Contribution to eLISA (2016-2022)
Key Technological Research & Development
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Space optics;
Inertial sensors;
Drag free technologies;
Telescope design;
Micro-thrusters........
Theoretical Studies:
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Early structure formation study, EMRI, IMRI, BH
Cosmology, Fundamental law,
Data analysis, numerical relativity
Instrument modeling and error analysis
Drag free control loop
GWD-China Design & Launch
or Make 20% Contribution to eLISA
(2023--2033)
I. Follow the cooperation agreement between China
and ESA to make 20% contribution to eLISA
II. GWD-China development and design
2023-2027：Ground based prototype & engineering
model installation
2028-2032：Develop flight loads
2033-
：Satellite launch & GWD
eGRACE for Earth Science Mission & GWDChina Technology Test Design
Expected range of key parameters for instrument design
• Distance between two S/Cs:
50-100km
• Altitude of orbit in relation to measurement sensitivity:
350-450km
• Drag free control: 10-7~10-8 m/s2/Hz1/2
• Drag free performance — residual acceleration
Accelerometer: 10-10 ~10-12 m/s2/Hz1/2 (0.1Hz)
• Precision of laser metrology:
μm ~ 100nm/Hz1/2 (0.1Hz)
Prospective Science Drivers
• Hydrology (especially in Asia)
• Climate change
• Seismology
GRACE, GOCE and eGRACE
KBR:
10^-6m/s/ √Hz
gradiometry： 10^-2E/√Hz
laser：
10- 100nm/ √Hz
Preliminary Mission Design for China
Strain sensitivity
(2011-2013)
GWD-China
frequency
Main scientific impacts
•Intermediate-Mass-Ratio In-spirals in globular clusters
•The Binary systems of Intermediate Mass Black Holes formed by Pop III stars
Gong X, Xu S, Bai S, et al. A scientific case study of an advanced LISA mission[J]. Classical and Quantum Gravity, 2011, 28(9): 094012.
Key Techniques Development
• Laser metrology
• Laser frequency stability
(Inst. Of Mech.,CAS; HUST,
Wuhan Inst. of Phys. and Math., CAS)
• Gravitational Reference Sensor
Capacitance sensing (HUST)
Drag-free control
Thruster and DFC
(Inst. of Mech., CAS; Dongfanghong Co. Ltd)
LISA Symposium X, section LISA Experimental I, Tuesday, May 20th, 14:20-14:35
Laser Interferometer Development
Institute of Mechanics/CAS
Institute of Physics/CAS
Wuhan Institute of Phys. & Math./CAS
Huazhong University of Sci. & Tech.
Isolated noises:
• Thermal noise
• Vibration noise
• Electromagnetic noise
Yu-Qiong L, Zi-Ren L, He-Shan L, et al. Chinese Physics Letters, 2012, 29(7): 079501.
LISA Symposium X, section Interferometry and Optics, Thursday, May 22nd, 17:15-17:30
Phasemeter
DPLL Architecture
2π μrad/√Hz @ (0.04 Hz - 10 Hz)
4 Channels ADC input
2 Channels DAC output
Liu H S, Dong Y H, Li Y Q, et al. Review of Scientific Instruments, 2014, 85(2): 024503.
LISA Symposium X, Poster Session Tuesday, May 20th, 15:45-17:30
Pointing control and phase locking
Demonstration of beam pointing control scheme
Demonstration of phase-locking, 1mW power
LISA Symposium X, section Related missions and future technologies, Thursday, May 22nd, 11:30 - 12:00
LISA Symposium X, section Gravitational Reference Sensors, Thursday, May 22nd, 17:15-17:30
Inertial Sensor Development in HUST
fiber
frame & TM
Torsion Pendulum
Sensitive to torque
Inertial sensor
micro-operation
platform
box
turntable
Torsion Balance
Sensitive to direct force
d0=152 um
Sensitive Direction
Require studying more DoFs simultaneously such as coupling.
School of Physics , HUST, China
LISA Symposium X, section Related missions and future technologies, Thursday, May 22, 11:30 - 12:00
LISA Symposium X, section Gravitational Reference Sensors, Thursday, May 22, 17:15-17:30
Experiments on Frequency Locking of Nd:YAG Lasers
(neodymium-doped yttrium aluminum garnet; Nd:Y3Al5O12)
Wuhan Inst. Of Phys. & Math., CAS
Micro-Thruster
--Institute of mechanics, CAS
Field Emission Electric Propulsion (FEEP)
Radio Frequency Ion Thrusters (RIT)
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Mechanism research of FEEP;
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Select gallium as propellant (Ga-FEEP)
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Development of Ga-FEEP emitter;
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Firing operation (8/10 successful )
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New emitter validation;
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Design of RIT; Development of direct thruster stand
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Complete the experimental prototype of Ga-FEEP & RIT microthruster
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Direct Thrust Measurement;
FEEP Test Facility
Ignition of Ga- FEEP
Direct Thruster Stand
Design of RIT
Coordinators of SGWD/CAS working group at CAS (2012)
Y.L. Wu (Univ. of Chinese Academy of Sciences, UCAS),
W.R. Hu and Gang Jin (Institute of Mechanics).
Members
L.Q. Peng (Bureau of Basic Research Sciences),
C.F. Qiao and Y.S. Pu (Univ. of Chinese Acad. of Sci.),
R.Q. Lau (Institute of Applied Math.) ,
G. Jin and Q. Kang (Institute of Mechanics),
Y.X. Nie and Z.Y. Wei (Institute of Physics),
M. Li and Y.Z. Zhang (Institute of Theoretical Physics),
S.N, Zhang (Institute of High Energy Physics)
Z.L. Zhou and Y.T. Zhu (National Astronomy Observatory),
M.S. Zhan and L.S. Chen (Wuhan Institute of Phys. & Math.)
Z.B.Zhou (HUST)
SGD Scientific Working Groups
Working group of “Science of measurement” (conveners: Gang Jin, Z.B.
Zhou, Z.H. Hu，also: Q. Kang, Y.X. Nie, Z.Y. Wei, L.S. Chen, M.S. Zhan )
Working group of “Astrophysical black holes” (conveners: S. N. Zhang, R.
Spurzum, Z. L. Zou )
Working group of “EMRI” (convener: R.Q. Lau)
Working group of “Tests of fundamental laws” (conveners: Yue-Liang Wu,
Yuan-Zhong Zhang, Cong-Feng Qiao)
Working group of “Cosmology” (conveners: Miao Li, Yun-Song Piao)
Working group of “Ultra‐compact binaries” (conveners: S.N. Zhang)
Working group of “Data analysis” (convener: R.Q. Lau)
In our quest for truth,
the road stretches endless ahead,
seemingly countless study to be made.
Yet we continue our search,
everywhere, above and beneath.
Qu Yuan (屈原，343–278 BC)
Thank you!