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Report No.

Experimental validation of beam particle self interaction in JT-60U by use of N-NB

Okano, Kunihiko*; Suzuki, Takahiro; Umeda, Naotaka; Hiwatari, Ryoji*; Masaki, Kei; Tobita, Kenji; Fujita, Takaaki

In a toroidal system, circulating fast ions generated by neutral beam injection affect the beam stopping cross-section of the neutral beam itself. This effect is called "beam particle self-interaction (BPSI)". In a recent experiment in JT-60U with 350 keV H$$^{0}$$ beam, an indication of this BPSI effect has been found for the first time. In a low density discharge at about 1$$times$$10$$^{19}$$m$$^{-3}$$, the beam shine-through decreased by about 35% within several hundred msec after beam injection. This result is consistent with a prediction by the BPSI theory.



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