Core density profile control by energetic ion anisotropy in LHD

Author:

Nishiura M.12ORCID,Shimizu A.1ORCID,Ido T.3ORCID,Satake S.1ORCID,Yoshinuma M.1ORCID,Yanai R.1ORCID,Nunami M.1ORCID,Yamaguchi H.1ORCID,Nuga H.1,Seki R.1ORCID,Fujita K.4ORCID,Salewski M.5ORCID

Affiliation:

1. National Institute for Fusion Science 1 , 322-6 Oroshi, Toki, 509-5292 Gifu, Japan

2. Graduate School of Frontier Sciences, The University of Tokyo 2 , Kashiwa 277-8561, Japan

3. Department of Advanced Energy Engineering, Kyushu University 3 , Kasuga, Fukuoka 816-8580, Japan

4. Department of Physics, Nagoya University 4 , Chikusa, Nagoya 464-8601, Japan

5. Department of Physics, Technical University of Denmark 5 , Lyngby, Denmark

Abstract

Electron and impurity ion density profiles have been controlled by using tangential and perpendicular neutral beams for plasma heating in a stellarator/heliotron for the first time. Reduced anisotropy of stored energy for energetic ion En⊥/Enǁ has resulted in an inward electron and impurity transport, forming a core electron density peaking. Increased anisotropy leads to a flat or hollowed electron density profile with an impurity exhaust in a core region [Yoshinuma et al., Nucl. Fusion 49, 062002 (2009)]. A high confinement state of particles in LHD has yet to be achieved, except for a temporal state of an electron density peaking created by a pellet injection. As a pioneering and crucial research result, the operation of energetic ion anisotropy by neutral beams has newly demonstrated that the direction of the radial transport of bulk and impurity ions can be controlled. At the same time, the overall plasma performance rises in neutron flux and stored energy. On the other hand, the increase in the anisotropy flattens the density profile. This new finding holds promise for a control knob of nuclear fusion reactors to enhance fusion power output.

Funder

Japan Society for the Promotion of Science

Publisher

AIP Publishing

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