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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. Nakao^4)
 
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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