高感度レーザー干渉計を用いた「重力波天文学」の研究

1998 Fiscal Year Annual Research Report

• Project/Area Number: 09NP0801
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: 古在 由秀 国立天文台, 名誉教授 (70012789)
• Co-Investigator(Kenkyū-buntansha): 中村 卓史 京都大学, 基礎物理学研究所, 教授 (80155837) ; 齋藤 芳男 高エネルギー加速器研究機構, 加速器第四系, 助教授 (00141979) ; 黒田 和明 東京大学, 宇宙線研究所, 教授 (00242165) ; 藤本 眞克 国立天文台, 位置天文天体力学研究系, 教授 (90107475) ; 坪野 公夫 東京大学, 大学院・理学系, 助教授 (10125271)
• Keywords: 重力波天文学 / レーザー干渉計 / 重力波検出

Research Abstract

今年度は昨年度から開始された300m干渉計の組立を続行して、リサイクルなしでの干渉計の全システムが完成し試運転を開始した。具体的な成果と進行状況は、
1. 前年度組み上げた1本腕の300m共振器をアラインメント制御することにより、目標の0.1マイクロラジアン以下の姿勢制御が達成され、共振器の安定な動作が実現された。
2. 数日間安定に動作しつづける共振器を用いて、基線長の絶対測定を行い、地下水圧の変化による約20ミクロンの地殻の伸縮を1ミクロンの精度で観測した。
3. もう1本の共振器とビームスプリッターを設置して、300m長のファブリペロー共振器を腕に持つマイケルソン干渉計を完成させ、試験用レーザーによる干渉計の動作確認に成功した。その後、安定動作を目指して干渉計各部の整備を行った。
4. モードクリーナーと10Wレーザーを結合して変調透過光の雑音確認や周波数安定化実験を行い、目標の安定度を得た。また、干渉計との結合後の全体の安定化シークエンスを検討した。
5. 数mmから1cm程度の広い光線に対して30ppm以下の損失という超高性能ミラーの開発に成功し、これを用いた20m干渉計によるリサイクリング実験に成功し、ゲインが10以上得られることを初めて明らかにした。
6. 光源部と干渉計の結合作業が終了して干渉計の全システムが組み上がり、試運転を開始した。
7. 高速データ取得部を整備すると共に、重力波波形の理論研究グループと協力してデータ解析に関する準備研究を開始した。
次年度は干渉計の整備・改良ののち、夏に連続運転による観測を行い、その後、リサイクリング導入とそれを用いた干渉計の運転、およびこれまでの研究のとりまとめを行う計画である。

Research Products

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• [Publications] K. Ueda: "Future of high power fiber lasers" Laser Physics. vol.8. 774-781 (1998)
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• [Publications] Miyoki S.: "Technique to Estimate the Reflectance of a High-Reflectance Dielectric Multilayar Coating Mirror Using Incident Beam Angular Dependence of Its Transmittance" Optical Review. Vol.5 No.1. 17-19 (1998)
• [Publications] T. Nakamura: "Coalescing Binary Neutron Stars/Black Holes" Proceedings of 49th Yamada Conference on Black Holes and High Energy Physics. 249-270 (1998)
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• [Publications] Y. Fujita: "Emission from Isolated Black Holes and MACHOs Accreting from the Interstellar Medium" Astrophys. J. Letters. 495. 85-89 (1998)
• [Publications] T. Nakamura: "Expected EAGLE event rate towards the Magellanic Clouds" Prog. Theor. Phys.99. 963-970 (1998)
• [Publications] T. Chiba: "Observational Tests of x-matter models" Month Not. R. astr Soc. 301. 72-80 (1998)
• [Publications] K. Ioka: "Black Hole Binary Formation in the Expanding Universe" Physical Review D. 58. 063003 (1998)
• [Publications] T. Nakamura: "A Model of Non High Energy Gamma Ray Bursts and the Sources of Ultra High Energy Cosmic Rays" Prog. Theor. Phys.100. 921-929 (1998)
• [Publications] T. Nakamura: "Black Hole Macho and its Identification" Physics Reports. 307. 181-190 (1998)
• [Publications] T. Chiba: "The Luminosity Distance, the Equation of State and the Geometry of the Universe" Prog. Theor. Phys.100. 1077-1082 (1998)
• [Publications] T. Nakamura: "Determining the Equation of State of the Expanding Universe-Inverese Problem in Cosmology-" M. N. R. A. S. (印刷中).
• [Publications] T. Futamase: "Gravitationally Lensed yet Morphologically Regular Images in Clusters of Galaxies as Astronomical Tools" Astrophysical Journal. 508. L47 (1998)
• [Publications] E. Komatsu: "Complete costraints on a nonminimally coupled chaotic inflationary senario from the cosmic microwave background" Physical Review. D59. 064029 (1998)
• [Publications] M. Takada: "On a growing transverse mode as post-Newtonian effect in the large-scale structure formation" Progress of Theoretical Physics. 100. 315 (1998)
• [Publications] Y. Itoh: "Thermal Hair of Quantum Black Hole" Physical Review.D58. 064016 (1998)
• [Publications] Y. Itoh: "Dynamical Instability of a two-dimensional quantum black hole" Physical Review. D57. R4516 (1998)
• [Publications] E.Komatsu: "Constraints on chaotic inflationary scenario with a nonminimally coupled inflaton field from the cosmic background radiation anisotropy" Physical Review. D58. 023004 (1998)
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• [Publications] J. Song: "46 W TEMOO output characteristics and thermal lensing effect of VPS laser under LD-pumping distribution control" Laser Physics. vol.8. 746-751 (1998)
• [Publications] T. Futamase: "Black holes and two-dimensional dilaton gravity" Physical Review. D57. 1129 (1998)
• [Publications] Masaru Shibata: "Innermost stable circular orbits around relatvistic rotating stars" Phys. Rev.D58. 104011 (1998)
• [Publications] Misao Sasaki: "Super-Horizon Scale Dynamics of Multi-Scalar Inflation" Prog. Theor. Phys.99. 763-782 (1998)
• [Publications] Takeshi Chiba: "Two Boosted Black Holes in Asymptotically de Sitter Space-Time: Relation between Mass and Apparent Horizon Formation" Physical Review. D57. 6119-6126 (1998)
• [Publications] Hideo Iguchi: "Gravitational Waves aroud a Naked Singularity Space-Time: Odd-parity perturbation of Lemaitre-Tolman-Bondi Space-Time" Physical Review. D58. 7262-7273 (1998)
• [Publications] Tomohiro Harada: "Naked Singularity Formation in the Collapse of a Spherical Cloud of Counter-Rotating Particles" Physical Review. D58. 041502-1-041502-5 (1998)
• [Publications] Norimasa Sugiura: "Distance-Redshift relation in an Inhomogeneous Universe: Friedmann-Lemaitre vs Dust--Rhell universe" Physical Review. D58. 103504-1-103504-12 (1998)
• [Publications] Daiske Ida: "Hoop Conjecture for Colliding Black Holes" Physical Review. D58. 121501-1-121501-4 (1998)
• [Publications] Ken-ichi Nakao: "Crossing of Spherical Massive Shells in Vacuum Space-Time" Progress of Theoretical Physics. 101. 47-71 (1999)
• [Publications] H. Asada: "Formulation for the Internal Motion of Quasi-equilibrium Configurations in General Relativity" Physical Review. D57. 7292-7298 (1998)
• [Publications] H. Asada: "Observation of Gravitational Lensing in the Clumpy Universe" Astrophysical Journal. 501. 473-477 (1998)
• [Publications] K. Taniguchi: "Irrotational and Incompressible Ellipsoids in the First Post-Newtonian Approximation of General Relativity" Progress of Theoretical Physics. 100. 703-735 (1998)
• [Publications] K. Tomita: "Distances in Inhomogeneous Cosmological Models" Progress of Theoretical Physics, Supplement. (印刷中).
• [Publications] M. Musha: "The interferometric gravitational wave detector TAMA-300 and the frequency-stabilized laser with high-finesse optical resonator" SPIE. (印刷中).
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• [Publications] A. Ueda: "Two-dimensional measurement of optical parameters of superhigh-quality mirrors" Laser Physics. Vol.8. 697-702 (1998)
• [Publications] A. Ueda: "Characteristics of large aperture and ultra-high quality mirrors for gravitational wave antenna" Rev. Laser Engineer.(印刷中).
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• [Publications] K. Ueda: "Optical cavity and future style of high-power fiber lasers" SPIE. 3267. 14-22 (1998)
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• [Publications] 中村卓史: "重力波をとらえる" 京都大学学術出版会, 417 (1998)