Analysis of Density Dependence of Neutron Rate in NBI Experim ents on TUMAN-3M

Content Provider	Semantic Scholar
Author	Kornev, Vyacheslav A. Askinazi, L. G. Chernyshev, Fedor V. Golant, Victor Krikunov, S. V. Lebedev, Sergey V. Melnik, Anastasia D. Razumenko, D. V. Rozhdestvensky, V. V. Tukachinsky, Alexander Vildjunas, M. I. Zhubr, N. A.
Copyright Year	2008
Abstract	Introduction The low toroidal field of the tokamak TUMAN-3M complicates plasma heating by Neutral Beam Injection (NBI) due to degradation of fast ion (FI) confinement. Recent experiments [1, 2] were aimed at study of fast ion confinement and mechanisms of losses of FI in co-NBI heating scenario with emphasis on density dependence of neutron rate. Measurements of 2.45 MeV D-D neutron flux were used for FI confinement study. Since the bulk ion temperature of the deuterium plasma in TUMAN-3M is rather small (\180 eV) the measured 2.5 MeV neutrons are produced exceptionally by beam-plasma D-D reactions and therefore are very sensitive to FI fraction. FI confinement time was estimated from the decay time of neutron rate after NBI switch-off. The measured decay times was compared with calculated one assuming classical slowing down. Experiment The TUMAN-3M is a relatively low aspect ratio (R/a=2.3) toroidal device. The plasma major and minor radii are 0.53 m and 0.23 m, respectively. The operational parameters for beam heated plasma were as follows: 7 . 0 ~ T B T, 170 ~ p I kA, 19 10 4 © ~ e n m -
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Language	English
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Content Type	Text
Resource Type	Article