An omegatron mass spectrometer for plasma ion species analysis

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1141382· OSTI ID:6399354

Wang, E Y; Schmitz, L; Ra, Y; LaBombard, B; Conn, R W ^[1]

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1. Institute of Plasma and Fusion Research, (USA) Department of Mechanical, Aerospace, and Nuclear Engineering, Los Angeles, CA (USA) University of California, Los Angeles, Los Angeles, CA (USA)

An omegatron mass spectrometer which can be used to measure the ion species and charge state distribution in a magnetized plasma is described. In the conventional omegatron, ions are formed as the result of gas ionization by a fine electron beam passing through the center of the analyzer along the magnetic field. In the plasma omegatron, the plasma ions are entering the analyzer through a small floating aperture. We employ a biasing technique to reduce the ion velocity along the magnetic field and, thus, achieve improved ion collection and sensitivity. Experiments have been performed to demonstrate the instrument's operation in the PISCES-A linear plasma device, at a magnetic field {ital B}=1.3 kG. Mass spectra have been obtained in hydrogen, helium, and nitrogen plasmas, and typical results are presented.

• DOE Contract Number: AS03-84ER52104
• OSTI ID: 6399354
• Journal Information: Review of Scientific Instruments; (USA), Journal Name: Review of Scientific Instruments; (USA) Vol. 61:8; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
DESIGN
ELEMENTS
FLUIDS
GASES
HELIUM
HYDROGEN
ION DENSITY
IONIC COMPOSITION
MASS SPECTROMETERS
MEASURING INSTRUMENTS
NITROGEN
NONMETALS
PLASMA DIAGNOSTICS
RARE GASES
SPECTROMETERS