Laser measurement of H- ions in a field-effect-transistor based radio frequency ion source

N. Tanaka, T. Matsuno, T. Funaoi, A. Ando, Y. Tauchi, H. Nakano, K. Tsumori, Y. Takeiri

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Hydrogen negative ion density measurements are required to clarify the characteristics of negative ion production and ion source performance. Both of laser photodetachment and cavity ring down (CRD) measurements have been implemented to a field-effect-transistor based radio-frequency ion source. The density ratio of negative hydrogen ions to electrons was successfully measured by laser photodetachment and effect of magnetic filter field on negative ion density was confirmed. The calculated CRD signal showed that CRD mirrors with 99.990 reflectivity are required and loss of reflectivity due to cesium contamination should be minimized.

Original languageEnglish
Article number02A731
JournalReview of Scientific Instruments
Issue number2
Publication statusPublished - 2012 Feb

ASJC Scopus subject areas

  • Instrumentation

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