Characteristics of volume produced negative hydrogen ions in a field-effect-transistor based ion source

N. Tanaka, T. Funaoi, K. Oikawa, Y. Saito, H. Nakano, A. Ando

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

1 Citation (Scopus)

Abstract

Measurement of negative hydrogen ions (H-) is one of the important diagnostics for development of negative ion sources. Cavity-Ring-Down (CRD) measurement system was successfully implemented for the H- density measurements in the Field-Effect-Transistor based Radio Frequency ion source. Reliability of the CRD system was experimentally confirmed, and basic characteristics of the H- ions and the ion source were studied. The measured H- density varied from 1015 to 1016 m-3 depending on the source parameters, such as input RF power, axial magnetic field in the driver region, and source pressure. The H- density increased linearly with increase of the RF power and the axial magnetic field increased, due to improvement of power transmission and plasma production efficiency. Source gas pressure dependence of the Hdensity showed an increase of H- density with the decrease of pressure. Higher electron temperature and lower neutral gas resulted in increased production of vibrationally excited molecules and decreased destructions of H- ions, which was feasible for in high H- density at low source pressure.

Original languageEnglish
Title of host publicationThird International Symposium on Negative Ions, Beams and Sources, NIBS 2012
Pages263-269
Number of pages7
DOIs
Publication statusPublished - 2013 Apr 12
Event3rd International Symposium on Negative Ions, Beams and Sources, NIBS 2012 - Jyvaskyla, Finland
Duration: 2012 Sep 32012 Sep 7

Publication series

NameAIP Conference Proceedings
Volume1515
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other3rd International Symposium on Negative Ions, Beams and Sources, NIBS 2012
CountryFinland
CityJyvaskyla
Period12/9/312/9/7

Keywords

  • Cavity-Ring-Down measurement
  • Negative hydrogen diagnostics
  • RF negative ion source

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Tanaka, N., Funaoi, T., Oikawa, K., Saito, Y., Nakano, H., & Ando, A. (2013). Characteristics of volume produced negative hydrogen ions in a field-effect-transistor based ion source. In Third International Symposium on Negative Ions, Beams and Sources, NIBS 2012 (pp. 263-269). (AIP Conference Proceedings; Vol. 1515). https://doi.org/10.1063/1.4792793