| Autor: |
Wickham, M., Lazar, N. H., Rynn, N. |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; May85, Vol. 56 Issue 5, p1033, 3p |
| Abstrakt: |
A diagnostic has been developed to simultaneously determine the magnetic field and space potential in fusion-like plasmas. In Fig. 1, we show schematically the diagnostic concept. The magnetic field is determined by a measurement of the Zeeman resonance absorption pattern of an energetic (< 30 keV) barium ion beam (10 µA). The spectrum is obtained by laser-induced fluorescence. In our approach, similar to a technique developed at UC Irvine, the absorption spectrum of the barium ion beam is measured as the frequency of a narrow-linewidth dye laser is scanned over the Doppler-shifted Zeeman-split resonance transition. The resonantly scattered light at 4934.1 Å is collected without frequency processing other than a narrow-band filter to reduce background plasma light. Space potentials are determined by a measurement of the Doppler shift due to a change in beam energy, E = E[sub 0] - eφ[sub p] (E[sub 0] is the beam energy, φ[sub p] is the plasma potential). The laser is injected tangentially to the ion beam to take advantage of the narrow Doppler spread in the direction of the beam. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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