Edge plasma density reconstruction for fast monoenergetic lithium beam probing
作者:
S. Sasaki,
S. Takamura,
M. Ueda,
H. Iguchi,
J. Fujita,
K. Kadota,
期刊:
Review of Scientific Instruments
(AIP Available online 1993)
卷期:
Volume 64,
issue 7
页码: 1699-1704
ISSN:0034-6748
年代: 1993
DOI:10.1063/1.1143996
出版商: AIP
数据来源: AIP
摘要:
Two different electron density reconstruction methods for 8‐keV neutral lithium beam probing have been developed for the Compact Helical System (CHS). Density dependences on emission and ionization processes are included by using effective rate coefficients obtained from the collisional radiative model. Since the two methods differ in the way the local beam density in the plasma is determined, the methods have different applicable electron densities. The beam attenuation is calculated by iteration from the electron density profile in method I. In method II, the beam remainder at the observation pointzis determined by integrating the Li iemission intensity fromztoward the position of emission tail‐off. At the emission tail‐off, the fast lithium beam is completely attenuated. Selecting an appropriate method enables us to obtain edge electron density profile well inside the last closed flux surface for various ranges of plasma densities (1012–5×1013cm−3). The electron density profiles reconstructed by these two different methods are in good agreement with each other and are consistent with results from ruby laser Thomson scattering.
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