<RESEARCH REPORT>COMPARATIVE STUDY OF FREE ELECTRON LASER EXPERIMENTS IN LONGITUDINAL AND TRANSVERSE WIGGLER GEOMETRIES

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概要

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• Experiments of intense electromagnetic wave generation in the frequency range of cm-mm microwave are carried out on the basis of the interactions of an IREB and various structures surrounding the beam. The results of the recent study using an IREB (particle energy of 0.6 MeV, peak intensity of 10kA and 10ns duration) in the regimes of collective Raman FEL and electron cyclotron maser in the axially periodic and transverse wigglers are described and discussed briefly. An intense radiation of 20-25GHz is observed in a considerably narrow range of the guide magnetic field and reasonably attributed to ECM mechanism. Although the effect of the wiggler field on the frequency spectrum of the generated e. m. waves is clearly seen, no distinct Raman FEL radiation is identified in any geometry. Compared with a simple linear theory it is found that the identification and the determination of the detected radiation modes are oc crucial importance especially under the effect of the strong axial uniform magnetic field imposed to keep the macroscopic stability of the REB. More exquisite diagnostics of the IREB parameters are needed to get a better coincidence with the the theoretical predictions.

• 核融合科学研究所の論文

著者

• HIROSE K.

  Faculty of Technology Tokyo University of Agriculture and Technology

• Masuzaki M.

  Faculty Of Science Kanazawa University

• Kubota Y.

  Institute of Plasma Physics, Nagoya University

• Kawasaki S.

  Faculty of science, kanazawa University

• Kamada K.

  Faculty of Science, Kanazawa University

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• COMPARATIVE STUDY OF FREE ELECTRON LASER EXPERIMENTS IN LONGITUDINAL AND TRANSVERSE WIGGLER GEOMETRIES

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