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The Japanese Space Gravitational Wave Antenna - DECIGO

The Japanese Space Gravitational Wave Antenna - DECIGO. GWADW @ Elba, Italy May 30, 2006

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The Japanese Space Gravitational Wave Antenna - DECIGO

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  1. The Japanese Space Gravitational Wave Antenna - DECIGO GWADW @ Elba, Italy May 30, 2006 Seiji Kawamura, Takashi Nakamura, Masaki Ando, Kimio Tsubono, Naoki Seto, Kenji Numata, Takahiro Tanaka, Kazuhiro Agatsuma, Tomotada Akutsu, Koh-suke Aoyanagi, Koji Arai, Akito Araya, Hideki Asada, Yoichi Aso, Takeshi Chiba, Toshikazu Ebisuzaki, Motohiro Enoki, Yoshiharu Eriguchi, Masa-Katsu Fujimoto, Mitsuhiro Fukushima, Toshifumi Futamase, Katsuhiko Ganzu, Tomohiro Harada, Tomohiro Harada, Tatsuaki Hashimoto, Kazuhiro Hayama, Wataru Hikida, Yoshiaki Himemoto, Hisashi Hirabayashi, Takashi Hiramatsu, Mizuhiko Hosokawa, Kiyotomo Ichiki, Takeshi Ikegami, Kaiki T. Inoue, Kunihito Ioka, Koji Ishidoshiro, Takehiko Ishikawa, Hiroyuki Ito, Yousuke Itoh, Shogo Kamagasako, Nobuyuki Kanda, Nobuki Kawashima, Hiroyuki Kirihara, Kenta Kiuchi, Werner Klaus, Shiho Kobayashi, Kazunori Kohri, Yasufumi Kojima, Keiko Kokeyama, Yoshihide Kozai, Hideaki Kudoh, Hiroo Kunimori, Kazuaki Kuroda, Kei-ichi Maeda, Hideo Matsuhara, Yasushi Mino, Jun-ichi Miura, 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, Erina Nishida, Atsushi Nishizawa, Yoshito Niwa, Masatake Ohashi, Naoko Ohishi, Masashi Ohkawa, Akira Okutomi, Kenichi Oohara, Norichika Sago, Motoyuki Saijo, Masaaki Sakagami, Shin-ichiro Sakai, Shihori Sakata, Misao Sasaki, Shuichi Sato, Takashi Sato, Masaru Shibata, Hisaaki Shinkai, Kentaro Somiya, Hajime Sotani, Naoshi Sugiyama, Hideyuki Tagoshi, Tadayuki Takahashi, Ryutaro Takahashi, Ryuichi Takahashi, Hirotaka Takahashi, Takamori Akiteru, Tadashi Takano, Keisuke Taniguchi, Atsushi Taruya, Hiroyuki Tashiro, Masao Tokunari, Morio Toyoshima, Shinji Tsujikawa, Yoshiki Tsunesada, Ken-ichi Ueda, Kazuhiro Yamamoto, Toshitaka Yamazaki, Jun'ichi Yokoyama, Chul-Moon Yoo, Shijun Yoshida, Taizoh Yoshino

  2. Contents • What is DECIGO? • Pre-conceptual Design • Science • Roadmap • R&D • Summary

  3. 10-18 10-20 10-22 10-24 What is DECIGO? Deci-hertz Interferometer Gravitational Wave Observatory - bridges the gap between LISA and terrestrial detectors. - could attain high sensitivity because of lower confusion noise. LISA Terrestrial Detectors Strain [Hz-1/2] DECIGO Confusion Noise 10-4 102 100 104 10-2 Frequency [Hz]

  4. Pre-conceptual Design FP-Michelson interferometer Arm length: 1000 km Laser power: 10 W Laser wavelength: 532 nm Mirror diameter: 1 m Mirror mass: 100 kg Finesse: 10 Orbit and constellation: TBD Drag-free satellite Arm cavity PD Laser Arm cavity Kawamura, et al., CQG 23 (2006) S125-S131 PD Drag-free satellite Drag-free satellite

  5. Drag-free and FP Cavity Displacement Signal between S/C and Mirror Local Sensor Mirror Thruster Thruster Actuator Displacement signal between the two Mirrors

  6. Sensitivity Goal

  7. Requirements [Practical force noise] • 4x10-17 N/Hz per mirror [Frequency Noise] @ 1 Hz • First-stage stabilization： 1 Hz/Hz • Stabilization gain by common-mode arm length： 105 • Common-mode rejection ratio： 105

  8. BH+BH(1000Msun) @z=1 NS+NS@z=1 Correlation for 3 years Science by DECIGO NS-NS (1.4+1.4Msun) • z<1 (SN>26: 7200/yr) • z<3 (SN>12: 32000/yr) • z<5 (SN>9: 47000/yr) IMBH (1000+1000Msun) • z<1 (SN>6000)

  9. Acceleration of Expansion of the Universe Expansion＋Acceleration? DECIGO GW NS-NS (z～1) Output Template (No Acceleration) Strain Real Signal ? Phase Delay～1sec (10 years) Time Seto, Kawamura, Nakamura, PRL 87, 221103 (2001)

  10. Constraint to Dark Energy Distance – Red shift relationship for NS-NS binaries  Constraint to dark energy Distance: determined directly by GW observation Red shift: determined by identifying the host galaxies (10 arcsec at z=1 for two far-separate DECIGOs)

  11. Roadmap for DECIGO 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 R&D Advanced R&D PF1 Observation Design & Fabrication PF2 Design & Fabrication Observation DECIGO 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

  12. DECIGO Pathfinder1 Objectives • Drag-free system • Cavity locking in space • Modest sensitivity at 0.1 – 1 Hz Local Sensor Thruster Actuator

  13. DECIGO Pathfinder2 Objectives • DECIGO with modest specification • Cavity locking between two satellites • Meaningful sensitivity Drag-free satellite Arm cavity PD Laser Arm cavity PD Drag-free satellite Drag-free satellite

  14. Release Hold Release Hold Release Hold DECIGO Simulator Objectives • Continual free-fall environment • Clamp release • Modest sensitivity down to 0.1Hz • Possibility of long arm Clamp 2m Vertical Position 1 sec Time

  15. DECIGO Demonstrator Thruster Thruster Satellite A Satellite B Mirror B Mirror A Actuator Local sensor Local sensor Air-hockey table Objectives • Lock acquisition

  16. Budget Situation for DECIGO • Budget request for “Frontier of All Wavelength Gravitational Wave Astronomy” submitted in 2005 - TAMA and CLIO - R&D for DECIGO - Pulsar Timing - Super-high frequency G.W. detection • Not approved to our surprise • Try again?

  17. Summary • DECIGO will have an extremely good sensitivity andopen the GW window widely. • DECIGO requires extremely challenging technology development. • We hope that we will be able to start the R&D for DECIGO very soon.

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