Negative ion enhancement in caesium-seeded hydrogen discharges - a volume or surface effect?

Philip Steen, Bill Graham

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Measurements of plasma parameters, including H- ion densities, made in conjunction with wall temperature, visible and vacuum ultraviolet emission spectroscopy verify that there is little caesium in the plasma volume of the H- ion source. Surface work function measurements indicate that there is significant caesium coverage of the inner walls of the ion source. It is found that, as the work function of a test surface decreases due to caesium seeding, the H- ion fraction in the discharge volume increases. These observations combine to indicate that, in the present source, the H- ion enhancement mechanism is a surface dominated effect. (C) 1999 American Institute of Physics. [S0003- 6951(99)04744-0].
Original languageEnglish
Pages (from-to)2737-2739
Number of pages3
JournalApplied Physics Letters
Volume75
Issue number18
Publication statusPublished - 01 Nov 1999

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Negative ion enhancement in caesium-seeded hydrogen discharges - a volume or surface effect?'. Together they form a unique fingerprint.

Cite this