Estimate of cusp loss width in multicusp negative ion source

T. Morishita, M. Ogasawara, Akiyoshi Hatayama

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)968-970
Number of pages3
JournalReview of Scientific Instruments
Volume69
Issue number2
DOIs
Publication statusPublished - 1998

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Ion sources
cusps
negative ions
ion sources
Negative ions
Magnetic fields
estimates
diffusion coefficient
magnetic fields
ambipolar diffusion
Larmor radius
collisions
Magnets
confining
Plasmas
magnets
Electrons
simulation
arcs
Ions

ASJC Scopus subject areas

  • Instrumentation

Cite this

Estimate of cusp loss width in multicusp negative ion source. / Morishita, T.; Ogasawara, M.; Hatayama, Akiyoshi.

In: Review of Scientific Instruments, Vol. 69, No. 2, 1998, p. 968-970.

Research output: Contribution to journalArticle

Morishita, T. ; Ogasawara, M. ; Hatayama, Akiyoshi. / Estimate of cusp loss width in multicusp negative ion source. In: Review of Scientific Instruments. 1998 ; Vol. 69, No. 2. pp. 968-970.
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