1. Spectroscopic Measurements of Plasma Ion Density by Neutral Beam Probing
- Author
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Shintaro Fukumoto, Yoshifumi Ito, Tsutomu Ishimura, and Seiichi Goto
- Subjects
Electron density ,Range (particle radiation) ,Hydrogen ,Chemistry ,General Engineering ,General Physics and Astronomy ,chemistry.chemical_element ,Plasma ,Laser ,law.invention ,Ion ,Ion beam deposition ,Physics::Plasma Physics ,law ,Atomic physics ,Beam (structure) - Abstract
A method of determining plasma ion density by spectroscopic measurement of line emission from a probing neutral beam, attenuated by resonance charge transfer interaction with plasma ions, is proposed and tested. A hydrogen plasma produced by an R.F. discharge was used as the subject of the test. The parameters of the hydrogen probing beam in the region of observation were ∼400 eV average energy, ∼3×1012 cm-3 peak density and ∼2 µs pulse width. The beam was produced by a z-pinch-gun, a neutral beam source. From the attenuation rate of Hβ emission and the known cross-section of the interaction, the ion density was determined when it was in the range from 2×1014 cm-3 to 5×1014 cm-3. The value determined agreed well with the electron density measured with an He–Ne laser interferometer.
- Published
- 1983