[Table of Contents]

Plasma and Fusion Research

Volume 9, 3402060 (2014)

Regular Articles

Coulomb Collisional Effects on High Energy Particles in the Presence of Driftwave Turbulence
Botsz HUANG, Yasutaro NISHIMURA and Chio-Zong CHENG
Institute of Space, Astrophysical, and Plasma Sciences, National Cheng Kung University, Tainan 70101, Taiwan
(Received 21 November 2013 / Accepted 24 February 2014 / Published 10 June 2014)

Abstract

High energy particles' behavior including fusion born alpha particles in an ITER like tokamak in the presence of background driftwave turbulence is investigated by an orbit following calculation. The background turbulence is given by the toroidal driftwave eigenmode combined with a random number generator. The transport level is reduced as the particle energy increase; the widths of the guiding center islands produced by the passing particles are inverse proportional to the square root of parallel velocities. On the other hand, the trapped particles are sensitive to E × B drift at the banana tips whose radial displacement is larger for lower energy particles. Coulomb collisional effects are incorporated which modifies the transport process of the trapped high energy particles whose radial excursion resides in limited radial domains without collisions.

Keywords

orbit following particle calculation, driftwave turbulence, guiding center model, Coulomb collision, alpha particle, ballooning mode, tokamak

DOI: 10.1585/pfr.9.3402060

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This paper may be cited as follows:

Botsz HUANG, Yasutaro NISHIMURA and Chio-Zong CHENG, Plasma Fusion Res. 9, 3402060 (2014).