Estimate of cusp loss width in multicusp negative ion source

T. Morishita, M. Ogasawara, Akiyoshi Hatayama

研究成果: Article査読

13 被引用数 (Scopus)


Expression of cusp loss width derived by Bosch and Merlino is applied to JAERI’s Kamaboko source. The width is related to the ambipolar diffusion coefficient across the cusp magnetic field. Electron–ion collision is found 1.2–7.4 times larger as compared with electron-neutral collision. Averaged cusp magnetic field in the diffusion coefficient is taken as a parameter in the simulation code for Kamaboko source. When the averaged magnetic field is 48 G, simulation results agree well with JAERI’s experiment in a wide range of pressure and arc power variation. The value of 48 G is reasonable from the consideration of confining the equation of ion source plasma. The obtained width is about 10 times the value evaluated by two times ion Larmor radius on the surface of cusp magnet.

ジャーナルReview of Scientific Instruments
出版ステータスPublished - 1998

ASJC Scopus subject areas

  • Instrumentation

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