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- Title
Formation of a Charge-Exchange Target for Fast Ions in the Plasma of Large-Scale Toroidal Devices under NBI Conditions.
- Authors
Mironov, M. I.; Khudoleev, A. V.; Kusama, Y.
- Abstract
High-energy (E > 0.2 MeV) charge-exchange diagnostics allow the determination of the distribution function of fast atoms produced via the neutralization of hydrogen isotope ions by target hydrogen-like impurity ions. To derive the distribution function from the experimental data requires knowledge of the composition and spatial distribution of the target ions in a tokamak plasma. A charge-exchange target forms as a result of the interaction between the main impurity nuclei and the heating neutral beams. In different devices, the heating beams are arranged in different ways with respect to the diagnostics; hence, in order to accurately estimate the contribution of the secondary ions to the detected signal, it is necessary to calculate their trajectories for every particular case. A model is proposed that takes into account elementary processes resulting in the ionization equilibrium of the ions of different impurities with allowance for ion motion in a specific tokamak configuration. As an example, the model is applied to the plasma of the JT-60U tokamak. Mechanisms for the formation of charge-exchange atomic flows in various energy ranges are considered. The relative contributions of different heating injectors to the charge-exchange flow are estimated. Based on the calculated results, a method is proposed for local measurements of the ion distribution function with the help of a stationary analyzer. © 2004 MAIK “Nauka / Interperiodica”.
- Subjects
HYDROGEN isotopes; IONS; TOKAMAKS; PINCH effect (Physics); FUSION reactors; TRAPPED-particle instabilities; PLASMA gases; PHYSICS
- Publication
Plasma Physics Reports, 2004, Vol 30, Issue 2, p164
- ISSN
1063-780X
- Publication type
Article
- DOI
10.1134/1.1648943