Validating neutral-beam current drive simulations in the TJ-II stellarator
Abstract
In this paper, we analyze the results of neutral-beam current drive (NBCD) experiments, performed in the TJ-II stellarator, with the aim of validating the theoretical predictions. Both parallel and anti-parallel injection with respect to the magnetic field were explored using co (NBI1) and counter (NBI2) beams at different injected beam power and plasma densities. The fast-ion current driven by both beams was simulated with the Monte Carlo code ASCOT and the electron response to the fast-ion current was calculated analytically using a model valid for an arbitrary magnetic configuration and a low collisionality plasma. The model reproduces with rather good agreement the toroidal current measured in NBI2 plasmas while the current driven by NBI1 is less than half the predicted one. Possible reasons for this discrepancy are discussed.
Cite
@article{arxiv.2301.03488,
title = {Validating neutral-beam current drive simulations in the TJ-II stellarator},
author = {Sadig Mulas and Álvaro Cappa and José Martínez-Fernández and Daniel López-Bruna and José Luis Velasco and Teresa Estrada and Jesús Manuel Gómez-Manchón and Macarena Liniers and Ignacio Pastor and Francisco Medina and Enrique Ascasíbar and TJ-II Team},
journal= {arXiv preprint arXiv:2301.03488},
year = {2023}
}