Electric potential near the extraction region in negative ion sources with surface produced negative ions

A. Fukano, A. Hatayama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The potential distribution near the extraction region in negative ion sources for the plasma with the surface produced negative ions is studied analytically. The potential is derived analytically by using a plasma-sheath equation, where negative ions produced on the Plasma Grid (PG) surface are considered in addition to positive ions and electrons. A negative potential peak is formed in the sheath region near the PG surface for the case of strong surface production of negative ions or for low energy negative ions. Negative ions are reflected by the negative potential peak near the PG and returned to the PG surface. This reflection mechanism by the negative potential peak possibly becomes a factor in negative ion extraction. It is also indicated that the potential difference between the plasma region and the wall decreases by the surface produced negative ions. This also has the possibility to contribute to the negative ion extraction.

Original languageEnglish
Title of host publicationSecond International Symposium on Negative Ions, Beams and Sources, NIBS2010
Pages68-77
Number of pages10
DOIs
Publication statusPublished - 2011 Oct 13
Event2nd International Symposium on Negative Ions, Beams and Sources, NIBS2010 - Takayama City, Japan
Duration: 2010 Nov 162010 Nov 19

Publication series

NameAIP Conference Proceedings
Volume1390
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other2nd International Symposium on Negative Ions, Beams and Sources, NIBS2010
CountryJapan
CityTakayama City
Period10/11/1610/11/19

Keywords

  • Extraction region
  • Negative ion sources
  • Negative potential peak
  • Plasma-sheath equation
  • Surface produced negative ions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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