Gravitational Wave Detection in Space in China

On behalf of Gravitational Wave Detection Working Group,

Chinese Academy of Sciences

Yueliang Wu (UCAS)

presented by Gang JIN Institute of Mechanics, CAS, Beijing 100190, P.R.China

10th LISA SymposiumGainesville, Fl., May 19-23, 2014

Outline of Talk

Road-map of Chinese Mission

A preliminary mission design for Chinaand 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

Dual Tracks of Development

Develop a Chinese Mission Contribute 20% to eLISA

Telescope, part of inertial sensors, optical bench, Phasemeter, escape orbit launcher, others ...

eGRACE as Application (evolving/extended/enlarged)

earth Gravity Recovery And Climate Experiment

GWD-ChinaGravitational Wave Detection in China

Roadmap of Chinese Mission

Roadmap of Chinese Mission

eGRACE (100 nm, 2013-2022)Temporal variation of earth gravity fieldand Test for main techniques of GWD

GWD-China (5pm,2013-2033)Space detection of GW

Road-map of Chinese MissioneGRACE Mission (2013-2022)

Roadmap of Chinese MissionGWD-China Mission (2013-2033)

Chinese Mission Study for GWD-China or 20% Contribution to eLISA (2016-2022)

Key Technological Research & Development– Space optics; – Inertial sensors; – Drag free technologies; – Telescope design; – Micro-thrusters........

Theoretical Studies:– Early structure formation study, EMRI, IMRI, BH– Cosmology, Fundamental law,– Data analysis, numerical relativity– Instrument modeling and error analysis– Drag free control loop

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II. GWD-China development and design

2023-2027 ： Ground based prototype & engineering

model installation

2028-2032 ： Develop flight loads

2033- ： Satellite launch & GWD

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

Prospective Science Drivers• Hydrology (especially in Asia)• Climate change• Seismology

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)

eGRACE for Earth Science Mission & GWD-China Technology Test Design

KBR: 10^-6m/s/ √Hzgradiometry ： 10^-2E/√Hzlaser ： 10- 100nm/ √Hz

GRACE, GOCE and eGRACE

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.

Preliminary Mission Design for China(2011-2013)

Main scientific impacts•Intermediate-Mass-Ratio In-spirals in globular clusters•The Binary systems of Intermediate Mass Black Holes formed by Pop III stars

frequency

Str

ain

sens

itivi

ty

GWD-China

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)

Laser Interferometer DevelopmentInstitute of Mechanics/CASInstitute of Physics/CASWuhan Institute of Phys. & Math./CASHuazhong University of Sci. & Tech.

Isolated noises:• Thermal noise• Vibration noise• Electromagnetic noise

LISA Symposium X, section LISA Experimental I, Tuesday, May 20th, 14:20-14:35

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

Liu H S, Dong Y H, Li Y Q, et al. Review of Scientific Instruments, 2014, 85(2): 024503.

Phasemeter

DPLL Architecture2π μrad/√Hz @ (0.04 Hz - 10 Hz)4 Channels ADC input2 Channels DAC output

Pointing control and phase lockingDemonstration of beam pointing control scheme

Demonstration of phase-locking, 1mW power

LISA Symposium X, Poster Session Tuesday, May 20th, 15:45-17:30

Inertial Sensor Development in HUSTfiber

frame & TM

micro-operation platform

turntable

Inertial sensor

box

Torsion Pendulum

Sensitive to torque

Torsion Balance Sensitive to direct force

Sensitive Direction

d0=152 um

Require studying more DoFs simultaneously

such as coupling. School of Physics , HUST, China

LISA Symposium X, section Related missions and future technologies, Thursday, May 22nd, 11:30 - 12:00LISA Symposium X, section Gravitational Reference Sensors, Thursday, May 22nd, 17:15-17:30

LISA Symposium X, section Related missions and future technologies, Thursday, May 22, 11:30 - 12:00LISA 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

FEEP Test Facility

Field Emission Electric Propulsion (FEEPFEEP)

Radio Frequency Ion Thrusters (RITRIT)• Mechanism research of FEEP;

• Select gallium as propellant (Ga-FEEP)

• Development of Ga-FEEP emitter;

• Firing operation (8/10 successful )

• New emitter validation;

• Design of RIT; Development of direct thruster stand

• Complete the experimental prototype of Ga-FEEP & RIT micro-

thruster

• Direct Thrust Measurement;

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)

Thank you!

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)