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(EX/P1-20) Potential Profiles in the Central Core of the Cathode in the Star Mode Operation in an Inertial-Electrostatic Fusion Neutron Source

K. Yoshikawa1), K. Masuda1), H. Toku1), A. Nagafuchi1), T. Mizutani1), H. Hashimoto1), K. Nagasaki1), Y. Yamamoto1), K. Takiyama2), M. Ohnishi3), H. Matsuura4), K. Funakoshi4), Y. Nakao4)
 
1) Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
2) Hiroshima University, Higashi Hiroshima, Japan
3) Kansai University, Suita, Osaka, Japan
4) Kyushu University, Hakozaki, Fukuoka, Japan

Abstract.  In an Inertial-Electrostatic Confinement Fusion (IECF) neutron source based on beam-beam colliding fusion, reaction rates are exclusively determined by the beam trajectories affected by the beam space charge-related potential in the center of the hollow cathode. Followed by the successful measurements of the localized electric fields inside the cathode in the center-spot mode by the laser-induced fluorescence (LIF) method, potential profiles in the star mode, which can produce largest D-D fusion neutrons, are measured, and compared with the simulation results. Adoption of more electric field-sensitive n = 4 (2S singlet to 4D singlet: HeI) transition in the Stark transition shows that the localized electric fields in the star mode has small electric fields compared with the center-spot mode as theoretical simulation predicts.

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IAEA 2003