
Author(s):
A. Bustos, F. Castejon, M. Osakabe, L. A. Fern”andez, V. MartinMayor

Title:
Kinetic Simulations of Fast Ions in Stellarators

Date of publication:
Nov. 2010

Key words:
22 IAEA Fusion Energy Conference, THW/P703

Abstract:
The steady state distribution function of NBI fast ions is calculated numerically for the LHD and TJII stellarators using the code ISDEP (Integrator of Stochastic Differential Equations for Plasmas). ISDEP is an orbit code that solves the guiding center motion of fast ions using Carte sian coordinates in position space, allowing arbitrary magnetic configurations and the reentering of particles in the plasma. It takes into account collisions of fast ions with thermal ions and electrons using the Boozer and KuoPetravic collision operator. The steady state distribution function is computed with a time integral following Green”Ēs function formalism for a time independent source. The rotation profiles of the fast ions are also estimated, thus computing their contribution to the total plasma current. In addition, energy slowing down time and escape distribution are studied in detail for both devices.
