2005 Fiscal Year Final Research Report Summary
Production of Low Energy Gamma-Ray by Inverse Compton Scattering using a Far Infrared Laser
| Project/Area Number |
14205018
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Japan Synchrotron Radiation Research Institute |
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Principal Investigator |
OHKUMA Haruo Japan Synchrotron Radiation Research Institute, Accelerator Division, Chief Scientist, 加速器部門・運転・軌道解析グループ・グループリーダー 主任研究員 (60194106)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Shinsuke Japan Synchrotron Radiation Research Institute, Accelerator Division, Chief Scientist, 加速器部門・加速管チーム, チームリーダー 主幹研究員 (00416380)
TAMURA Kazuhiro Japan Synchrotron Radiation Research Institute, Accelerator Division, Chief Scientist, 加速器部門・光診断チーム, 副主幹研究員 (10360835)
OKAJIMA Shigeki Chubu Univerrsity, Faculty of Engineering, Professor, 工学部, 教授 (90113084)
FUJIWARA Mamoru Osaka University, RCNP, Assistant Professor, 核物理研究センター, 助教授 (00030031)
UTSUNOMIYA Hiroaki Konan University, Professor, 理工学部, 教授 (00241167)
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| Project Period (FY) |
2002 – 2005
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| Keywords | Inverse Compton Scattering / Laser Electron Photon / Gamma-Ray / Far Infrared Laser / Waveguide / High Energy Syncrotron Radiation |
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| Research Abstract |
1.Technology of low energy γ-ray production
FIR laser was transported to the laser incident chamber on the beamline front-end in the storage ring tunnel by hollow acrylic waveguides into which dry air of -40℃ dew-point temperature was flow. Its distance is about 20m long, and 80% transmission efficiency was achieved. Beam profile monitor using a pyro-electric sensor was developed and installed at 2m-upstream from the chamber. By using this monitor, laser optical axis was tuned for the interaction point to electron beam. By the calculation considering the diffraction effect by many aperture limits in the duct of front-end, a production rate of γ-ray was estimated to be Nγ=1.1×10^4 photons/sec per 2W FIR laser of 118.8μm.
2.Development of high-power optically-pumped FIR laser
234.5W-output power of the pumping CO_2 laser was achieved at 9P(38) lasing line, which was used for pumping CH_3OH for 118.8μm lasing. Maximum output power of FIR laser was about 1.6W, and ±1 % of power variation was
… More
achieved for a long-term stability of 24 hours. To produce 20MeV range γ-ray, a short wavelength FIR laser and optical material of silicon for 48μm- and 57μm-laser were developed.
3.Measurement of produced γ-ray
To take measures of pileup of detection system and to reduce a background, LYSO scintillator was installed in 10mm-thickness Pb-box. Absorbers and collimator system were installed in front of the detector. Energy calibration was done by using radioactivity source of ^<88>Y. It was confirmed that stored electrons were not lost during the inverse Compton scattering. From measurement result, we estimated γ-ray production rate at 6×10^3 photons/sec per a 2W FIR laser.
4.Future plan
To produce high intense γ-ray, an advanced plan is in progress at the new beamline which has a 16m-long interaction region. Laser beam will be transported to near the interaction region by waveguides to recover a reduction of effective cross-section due to a large divergence of laser. Manufacture and installation of the mirror chamber, and construction of the laser clean room and the waveguide system were completed. In this beamline γ-ray production rate will be expected more than 10^5 photons/sec. Less
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Research Products
(28 results)
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[Journal Article] Development of high-performance cw far-infrared lasers and the application for advanced experimental physics2006
Author(s)
S.Okajima, K.Nakayama, M.Tomimoto, H.Yamagishi, D.Kondo, K.Muraoka, K.Kawahata, K.Tanaka, T.Tokuzawa, T.Akiyama, Y.Ito, H.Ohkuma
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Journal Title
The Papers of 2006 JSEM Annual Conference on Experimental Mechanics (in Japanese)
Pages: 193-196
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Temperature dependence of optical constants of silicon for short wavelength FIR laser lines2005
Author(s)
K.Nakayama, S.Okajima, H.Ohkuma, K.Kawahata, K.Tanaka, T.Tokuzawa, T.Akiyama, Y.Ito
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Journal Title
Conference Digest of Joint 30th International Conference on Infrared and Millimeter Waves and 13th International Conference on Terahertz electronics (Williamsburg, Verginia, USA, September19-23, 2005)
Pages: 596-597
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Photonuclear reaction studies at synchrotron radiation facilities in Japan2004
Author(s)
H.Utsunomiya, K.Y.Kara, S.Goko, H.Akimune, T.Yamagata, M.Ohta, H.Ohgaki, H.Toyokawa, T.Hayakawa, T.Shizuma, P.Mohr, Y.-W.Lui, H.Ohkuma, H.Yonehara, K.Soutome, M.Arnould
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Journal Title
Nucl.Phys.A 738
Pages: 136-142
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Production of 10 MeV γ-ray by the Backward Compton Scattering Using an Optically-Pumped FIR Laser at SPring-82004
Author(s)
H.Ohkuma, Y.Arimoto, K.Kawase, K.Tamura, S.Suzuki, T.Yorita, M.Shoji, K.Nakanishi, H.Akimune, M.Fujiwara, S.Okajima
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Journal Title
Conference Digest of Joint 29th International Conference on Infrared and Millimeter Waves and 12th International Conference on Terahertz electronics (Karlsruhe, Germany, September 27-October 1, 2004)
Pages: 789-790
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Beam-Performance Improvement of the SPring-8 Storage Ring2003
Author(s)
H.Ohkuma, S.Date, M.Masaki, T.Nakamura, T.Ohshima, K.Soutome, S.Takano, K.Tamura, M.Takao, H.Tanaka, N.Kumagai;
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Journal Title
Proceedings of the 2003 Particle Accelerator Conference (Oregon, USA, May 12-16, 2003)
Pages: 881-883
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Development of High Power Optically-Pumped cw FIR Lasers2003
Author(s)
S.Okajima, K.Nakayama, K.Kawahata, K.Tanaka, T.Tokuzawa, Y.Ito, H.Ohkuma, Y.Arimoto, S.Suzuki, K.Tamura
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Journal Title
Conference Digest of the 28th International Conference on Infrared and Millimeter Waves (September 29-October 2, 2003,Ohtsu, Shiga, Japan)
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Nuclear astrophysics experiments with a laser-electron photon beam
Author(s)
H.Utsunomiya, S.Goko, H.Akimune, K.Yamasaki, T.Yamagata, M.Ohta, H.Ohgaki, H.Toyokawa, Y.-W.Lui, T.Hayakawa, T.Shizuma, H.Ohkuma, S.Okajima, K.Sumiyoshi, T.Kajino
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Journal Title
Perspectives in Heavy Ion Physics(edited by K.Yoshida, S.Kubono, I.Tanihata, and C.Signorini)(World Scientific, Singapore, 2002)
Pages: 286-297
Description
「研究成果報告書概要(欧文)」より
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