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1 DECIGO Masaki Ando (Department of Physics, Kyoto University) Original Picture : Sora Seiji Kawamura, Takashi Nakamura, Kimio Tsubono, Takahiro Tanaka, Ikkoh Funaki, Naoki Seto, Kenji Numata, Shuichi Sato, Nobuyuki Kanda, Takeshi Takashima, Kunihito Ioka, Kazuhiro Agatsuma, Tomotada Akutsu, Tomomi Akutsu, Koh-suke Aoyanagi, Koji Arai, Yuta Arase, Akito Araya, Hideki Asada, Yoichi Aso, Takeshi Chiba, Toshikazu Ebisuzaki, Motohiro Enoki, Yoshiharu Eriguchi, Masa-Katsu Fujimoto, Ryuichi Fujita, Mitsuhiro Fukushima, Toshifumi Futamase, Katsuhiko Ganzu, Tomohiro Harada, Tatsuaki Hashimoto, Kazuhiro Hayama, Wataru Hikida, Yoshiaki Himemoto, Hisashi Hirabayashi, Takashi Hiramatsu, Feng-Lei Hong, Hideyuki Horisawa, Mizuhiko Hosokawa, Kiyotomo Ichiki, Takeshi Ikegami, Kaiki T. Inoue, Koji Ishidoshiro, Hideki Ishihara, Takehiko Ishikawa, Hideharu Ishizaki, Hiroyuki Ito, Yousuke Itoh, Shogo Kamagasako, Nobuki Kawashima, Fumiko Kawazoe, Hiroyuki Kirihara, Naoko Kishimoto, Kenta Kiuchi, Shiho Kobayashi, Kazunori Kohri, Hiroyuki Koizumi, Yasufumi Kojima, Keiko Kokeyama, Wataru Kokuyama, Kei Kotake, Yoshihide Kozai, Hideaki Kudoh, Hiroo Kunimori, Hitoshi Kuninaka, Kazuaki Kuroda, Kei-ichi Maeda, Hideo Matsuhara, Yasushi Mino, Osamu Miyakawa, Shinji Miyoki, Mutsuko Y. Morimoto, Tomoko Morioka, Toshiyuki Morisawa, Shigenori Moriwaki, Shinji Mukohyama, Mitsuru Musha, Shigeo Nagano, Isao Naito, Noriyasu Nakagawa, Kouji Nakamura, Hiroyuki Nakano, Kenichi Nakao, Shinichi Nakasuka, Yoshinori Nakayama, Erina Nishida, Kazutaka Nishiyama, Atsushi Nishizawa, Yoshito Niwa, Masatake Ohashi, Naoko Ohishi, Masashi Ohkawa, Akira Okutomi, Kouji Onozato, Kenichi Oohara, Norichika Sago, Motoyuki Saijo, Masaaki Sakagami, Shin-ichiro Sakai, Shihori Sakata, Misao Sasaki, Takashi Sato, Masaru Shibata, Hisaaki Shinkai, Kentaro Somiya, Hajime Sotani, Naoshi Sugiyama, Yudai Suwa, Hideyuki Tagoshi, Kakeru Takahashi, Keitaro Takahashi, Tadayuki Takahashi, Hirotaka Takahashi, Ryuichi Takahashi, Ryutaro Takahashi, Takamori Akiteru, Tadashi Takano, Keisuke Taniguchi, Atsushi Taruya, Hiroyuki Tashiro, Mitsuru Tokuda, Masao Tokunari, Morio Toyoshima, Shinji Tsujikawa, Yoshiki Tsunesada, Kenichi Ueda, Masayoshi Utashima, Hiroshi Yamakawa, Kazuhiro Yamamoto, Toshitaka Yamazaki, Jun'ichi Yokoyama, Chul-Moon Yoo, Shijun Yoshida, Taizoh Yoshino
2 1. DECIGO Overview and Science Pre-conceptual Design 2. DECIGO Pathfinder Overview and Science Design and Status 3. Summary
3 1. DECIGO Overview and Science Pre-conceptual Design 2. DECIGO Pathfinder Overview and Science Design and Status 3. Summary
4 DECIGO DECIGO (Deci-hertz interferometer Gravitational wave Observatory) Space GW antenna ~2024 Obs. band around 0.1 Hz Bridge the obs.gap between LISA and Terrestrial detectors Strain [1/Hz 1/2 ] LISA DECIGO Terrestrial Detectors (Ad. LIGO, LCGT, etc) Frequency [Hz]
5 Pre-Conceptual Design Interferometer Unit: Differential FP interferometer Arm length: 1000 km Mirror diameter: 1 m Laser wavelength:532 nm Finesse: 10 Laser power: 10 W Mirror mass: 100 kg S/C: drag free 3 interferometers Laser Photodetector Mirror Arm cavity Drag-free S/C
![energy) GW amplitude [Hz -1/2 ] 10-18 10-20 10-22 10-24 10-26 3month Merger](/docs-images/103/159314959/images/6-3.jpg "DECIGO (Correlation) DECIGO (1 unit) Merger NS inspiral (z~1) 10-4 10-2 10 0 10")
6 Targets and Science IMBH binary inspiral NS binary inspiral Stochastic background Galaxy formation (Massive BH) Cosmology (Inflation, Dark energy) GW amplitude [Hz -1/2 ] month Merger DECIGO (Correlation) DECIGO (1 unit) Merger NS inspiral (z~1) Frequency [Hz]
7 Constraint on dark energy DECIGO will observe NS binaries at z~1 Precise clock at cosmological distance Standard Siren Expansion +Acceleration? DECIGO Relationship between distance and redshift Information on acceleration of expansion of the universe Strain NS-NS (z~1) Template (No Acceleration) GW Output Distance: chirp waveform Redshift: host galaxy Real Signal? Phase Delay ~1sec (10 years) Time Seto, Kawamura, Nakamura, PRL 87, (2001) Determine cosmological parameters Absolute and independent measurement Angular resolution ~10arcmin (1 detector) ~10arcsec (3 detectors) at z=1
8 Standard Sources Fig. from SNAP web page Supernova (EM wave) Standard Candle Neutron-star binary (GW) Standard Siren Absolute power or amplitude Extrapolated from nearby events < General Relativity Event rate 2000/yr (SNAP) < /yr (DECIGO) Error in distance ~10% ~ 10% at z=1 Identification of host galaxy Easy? > Require multiple detectors or statistics Others Uncertainty by dust absorption < Negligible interaction with matters R.Takahashi (2006)
9 IMBH inspiral and Merger DECIGO will observe Intermediate-mass BH (IMBH) binary merger with SNR>6000 for z~1 source Information on the formation of Supermassive BHs at the center of galaxies 戎崎俊一 ( 理化学研究所 ) 先生の web ページより引用
10 Stochastic Background GWs
11 LCGT and DECIGO LCGT (~2014) Terrestrial Detector High frequency events DECIGO (~2024) Space observatory Low frequency sources Target: GW detection Target: GW astronomy
12 1. DECIGO Overview and Science Pre-conceptual Design 2. DECIGO Pathfinder Overview and Science Design and Status 3. Summary
13 Pre-Conceptual Design Interferometer Unit: Differential FP interferometer Arm length: 1000 km Mirror diameter: 1 m Laser wavelength:532 nm Finesse: 10 Laser power: 10 W Mirror mass: 100 kg S/C: drag free 3 interferometers Laser Photodetector Mirror Arm cavity Drag-free S/C
14 Interferometer Design Transponder type vs Direct-reflection type Compare : Sensitivity curves and Expected Sciences Decisive factor: Binary confusion noise Strain [1/Hz 1/2 ] LISA DECIGO (LISA type, 5x10 4 km) DECIGO (FP type, 1000km) Frequency [Hz] Laser: 10W, 532nm Mass: 100kg Mirror: 1m dia. LCGT
15 Arm length Cavity arm length : Limited by diffraction loss Effective reflectivity (TEM 00 TEM 00 ) Laser wavelength : 532nm Mirror diameter: 1m Optimal beam size 1000 km is almost max Ratio of available power Nd:YAG laser : 532nm Mirror diameter : 1m Optimal beam profile TAMA (300 m) LCGT (3x10 3 m) DECIGO (1x10 6 m) LISA (5x10 9 m) Diffraction Loss Arm Length [m]
16 Cavity and S/C control Cavity length change PDH error signal Mirror position (and Laser frequency) Relative motion between mirror and S/C Local sensor S/C thruster Displacement Signal between S/C and Mirror Local Sensor S/C 1 S/C 2 Mirror Thruster Actuator Thruster Displacement signal between the two Mirrors Fig: S. Kawamura
17 Requirements Sensor Noise Shot noise 3 x m/hz 1/2 (0.1 Hz) x 10 of LCGT in phase noise Other noises should be well below the shot noise Laser freq. noise: 1 Hz/Hz 1/2 (1Hz) Stab. Gain 10 5, CMRR 10 5 Acceleration Noise Force noise 4x10-17 N/Hz 1/2 (0.1 Hz) x 1/50 of LISA External force sources Fluctuation of magnetic field, electric field, gravitational field, temperature, pressure, etc.
18 Orbit and Constellation Candidate of orbit: Record-disk orbit around the Sun Relative acc. 4x10-12 m/s 2 (Mirror force ~10-9 N ) Separated unit Halo orbit around L2 (or L1) Relative acc. 4x10-7 m/s 2 (Mirror force ~10-4 N ) Constellation 4 interferometer units Separated unit overlapped units 2 overlapped units Cross correlation 2 separated units Angular resolution
19 Roadmap Figure: S.Kawamura Mission Objective R&D Fabrication SDS-1/SWIM DECIGO Pathfinder (DPF) Space test of key tech. GW observation R&D Fabrication Pre-DECIGO Detect GW with min. spec FP between S/C R&D Fabrication DECIGO GW astronomy Design Single small satellite Short FP interferometer 3 S/C 1 interferometer unit 3 S/C x 3-4 units
20 Organization PI: Kawamura (NAOJ) Deputy: Ando (Tokyo) Executive Committee Kawamura (NAOJ), Ando (Tokyo), Seto (NAOJ), Nakamura (Kyoto), Tsubono (Tokyo), Tanaka (Kyoto), Funaki (ISAS), Numata (Maryland), Sato (Hosei), Kanda (Osaka city), Takashima (ISAS), Ioka (Kyoto) DECIGO pathfinder Leader: Ando (Tokyo) Deputy: Takashima (ISAS) Pre-DECIGO Sato (Hosei) Detector Numata (Maryland) Ando (Kyoto) Design phase Mission phase Science, Data Tanaka (Kyoto) Seto (NAOJ) Kanda (Osaka city) Satellite Funaki (ISAS) Detector Ando (Kyoto) Laser Ueda (ILS) Musya (ILS) Housing Sato (Hosei) Drag free Moriwaki (Tokyo) Sakai (ISAS) Thruster Funaki (ISAS) Bus Takashim a (ISAS) Data Kanda (Osaka city)
21 1. DECIGO Overview and Science Pre-conceptual Design 2. DECIGO Pathfinder Overview and Science Design and Status 3. Summary
22 DECIGO-PF DECIGO Pathfinder (DPF) First milestone mission for DECIGO Shrink arm cavity DECIGO 1000km DPF 30cm Single satellite (Payload ~1m 3, 350kg) Low-earth orbit (Altitude 500km, sun synchronous) 30cm FP cavity with 2 test masses Stabilized laser source Drag-free control Local Sensor Actuator Thruster
23 DPF and DECIGO DPF requirements Precise meas. by IFO Disp. noise 6x10-16 m/hz 1/2 4x10-18 m/hz 1/2 Force noise N/Hz 1/ N/Hz 1/2 DECIGO requirements 1000km FP cavity IFO control in space Low external force Large optics Stab. Laser Freq. Stability 0.5 Hz/Hz 1/2 1 Hz/Hz 1/2 Ultra stable Laser Stabilization of source Stabilization by long arm Drag-free control GW Obs. Satellite disp m/hz 1/2 Thruster noise 10-7 N/Hz 1/2 0.1 Hz band Observation and Data analysis Formation flight Stable orbit Inter S/C Ranging Drag-free control Low-noise thruster Observation Data procession Data analysis Triggered search
24 DPF mission payload Mission weight : ~150kg Mission space : ~90 x 90 x 90 cm Drag-free control Local sensor signal Feedback to thrusters Laser source Yb:YAG laser (1030nm) Power : 25mW Freq. stab. by Iodine abs. line Fabry-Perot interferometer Finesse : 100 Length : 30cm Test mass : 1kg Signal extraction by PDH
25 DPF Sensitivity Laser source : 1030nm, 25mW IFO length : 30cm Finesse : 100, Mirror mass : 1kg Q-factor : 10 5, Substrate: TBD Temperature : 293K Noise level [1/Hz 1/2 ] Geogravity PM acceleration Noise Laser Radiation pressure noise Thruster noise Satellite mass : 350kg, Area: 2m 2 Altitude: 500km Thruster noise: 0.1μN/Hz 1/2 (Preliminary parameters) Frequency [Hz] Cavity length: 30cm Laser: 1030nm, 25mW Finesse: 100 Mirror mass: 1kg Q value of a mirror: 10 6 Laser Frequency noise Shot noise Mirror thermal Displacement Noise [m/hz 1/2 ]
26 Objectives of DPF
27 DPF sensitivity DPF sensitivity h ~ 2x10-15 Hz 1/2 (x10 of shot noise limit) Strain [1/Hz 1/2 ] LISA Foreground GWs Massive BH inspirals Galaxy binaries Background GWs from early universe (Ω gw=10-14 ) DECIGO DPF limit NS binary inspiral Pulsar (1yr) Core-collapse Supernovae ScoX-1 (1yr) LCGT Gravity-gradient noise (Terrestrial detectors) Frequency [Hz]
28 GW target of DPF Blackholes events in our galaxy IMBH inspiral and merger h ~ 10-15, f ~ 4 Hz Distance 10kpc, m = 10 3 M sun Obs. Duration (~1000sec) BH QNM h ~ 10-15, f ~ 0.3 Hz Distance 1Mpc, m = 10 5 M sun Observable range reaches the Galactic center (SNR~5 ) Observable Range [kpc, SNR=5] BH Inspiral BH QNM KAGAYA Galactic Center Hard to access by others Original observation Mass [M solar ] (By N.Kanda)
29 DPF targets BHs in Globular clusters BH masses estimated from star motion Estimate SNR of GW signals Equal mass, Mass ratio 1:1/3, 100Msun BH capture Credit: NASA, STScI (~150 Globular Clusters in our Galaxy) (By N.Seto)
30 Gravity of the Earth Measure gravity field of the Earth for Satellite Orbits GPS satellite Determine global gravity field Density distribution Monitor of change in time Ground water motion Strains in crusts by earthquakes and volcanoes 東京大字地震研 新谷氏 京都大学 福田氏の資料 / 情報提供 Observation Gap between GRACE and GRACE-FO ( ) DPF contribution in international network
31 1. DECIGO Overview and Science Pre-conceptual Design 2. DECIGO Pathfinder Overview and Science Design and Status 3. Summary
32 DPF satellite DPF Payload Size : 950mm cube Weight : 150kg Power : 130W Data Rate: 800kbps Mission thruster x12 Power Supply SpW Comm. Mission Thruster head Mast structure Stabilized. Laser source On-board Computer Satellite Bus ( Standard bus system) Size : 950x950x1100mm Weight : 200kg SAP : 960W Battery: 50AH Downlink : 2Mpbs DR: 1GByte 3N Thrusters x 4 Satellite Bus system Bus thruster Solar Paddle Interferometer module
33 Comparison with LPF Purpose Launch Weight Orbit Test Mass Laser source Interferometer Sensitivity LPF (LISA Pathfinder) Demonstration for LISA 2010 Dedicated launcher (Vega) 1,900 kg Halo orbit around L1 Drag-free attitude control Au-Pt alloy x2 Nd:YAG (1064nm) Mach-Zehnder 3x10-14 m/s 2 /Hz 1/2 (1mHz) DPF (DECIGO Pathfinder) Demonstration for DECIGO GW observation ~2013 Dedicated launcher (M-V follow-on) 350 kg SSO altitude 500km Drag-free attitude control TBD x2 Yb:YAG (1030nm) Fabry-Perot 1x10-15 m/s 2 /Hz 1/2 (0.1Hz) Mission Thrusters Thruster Control Unit Stabilized Laser Central Processing Unit Housing Control Unit Interferometer Module Interfererometer Control Unit Bus Thrusters Solar Paddle
34 SWIM launch Test of signal processing and control system Photo: JAXA SWIM (Space-wire Demonstration module) on SDS-1 satellite Launched in Jan. 23, 2009 SpaceCube2: Space-qualified Computer SWIMµν : User Module CPU: HR5000 (64bit, 33MHz) System Memory: 2MB Flash Memory 4MB Burst SRAM 4MB Asynch. SRAM Data Recorder: 1GB SDRAM 1GB Flash Memory SpW: 3ch Size: 71 x 221 x 171 Weight: 1.9 kg Power: 7W Photo by JAXA Photo by JAXA Processor test board GW+Acc. sensor FPGA board DAC 16bit x 8 ch ADC 16bit x 4 ch 32 ch by MPX Torsion Antenna x2 ~47g test mass Data Rate : 380kbps Size: 124 x 224 x 174 Weight: 3.5 kg Power: ~7W
35 SWIMµν Tiny GW detector ~47g test masses inside Levitated control in space TAM: Torsion Antenna Module with free-falling test mass (Size : 80mm cube, Weight : ~500g) Test mass ~47g Aluminum, Surface polished Small magnets for position control SWIMmn Module 2 TAMs in the frame Photo sensor Reflective-type optical displacement sensor Separation to mass ~1mm Sensitivity ~ 10-9 m/hz 1/2 6 PSs to monitor mass motion Coil Used for test-mass position control Max current ~100mA
36 Successful control SWIM In-orbit operation z control on Test mass controlled Error signal zero Damped oscillation (in pitch DoF) Free oscillation in x and y DoF Signal injection OL trans. Fn. yaw control on Operation: May 12, 2009 Downlink: ~ a week
37 R&D for DPF (1) By Stabilized Laser M.Musha BBM development Yb:YAG (NPRO) source Saturated absorption by I 2 Stability test, Packaging IFO and housing BBM-EM development Test of concepts + Earth gravity sensors By S.Sato By A.Araya
38 R&D for DPF (2) Attitude control and Drag-free Satellite structure (mass distribution) Passive attitude stabilization by gravity gradient Mission thruster position Control topology By S.Moriwaki Thruster System design with existing tech. Noise meas. system (thruster stand) Development of Slit FEEP By I.Funaki
39 DPF mission status DPF : One of the candidate of JAXA s small satellite series At least 3 satellite in 5 years with Standard Bus + M-V follow-on rocket SPRINT-A /EXCEED 1 st mission (2012): SPRINT-A/EXCEED 2 nd mission (~20013) in selection Candidates: 2 missions (ERG, DPF) Hearing tomorrow!
40 1. DECIGO Overview and Science Pre-conceptual Design 2. DECIGO Pathfinder Overview and Science Design and Status 3. Summary
41 Summary DECIGO : Fruitful Science Very beginning of the Universe Dark energy Galaxy formation DECIGO Pathfinder Important milestone for DECIGO Preparing for the final selection SWIM under operation in orbit first precursor to space!
42 End
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The Japanese Space Gravitational Wave Antenna; DECIGO Seiji Kawamura 1, Masaki Ando 2, Takashi Nakamura 3, Kimio Tsubono 2, Takahiro Tanaka 3, Ikkoh Funaki 4, Naoki Seto 1, Kenji Numata 5, Shuichi Sato
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The Japanese Space Gravitational Wave Antenna - DECIGO Seiji Kawamura 1, Masaki Ando 2, Takashi Nakamura 3, Kimio Tsubono 2, Takahiro Tanaka 3, Ikkoh Funaki 4, Naoki Seto 1, Kenji Numata 5, Shuichi Sato
Home Search Collections Journals About Contact us My IOPscience DECIGO pathfinder This article has been downloaded from IOPscience. Please scroll down
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