Particle transport after pellet injection in the TJ-II stellarator
J.L. Velasco, K. J. McCarthy, N. Panadero, S. Satake, D., L\'opez-Bruna, A. Alonso, I. Calvo, T. Estrada, J. M. Fontdecaba, J., Hern\'andez, R. Garc\'ia, F. Medina, M. Ochando, I. Pastor, S. Perfilov, E., S\'anchez, A. Soleto, B. Ph. Van Milligen, A. Zhezhera, the TJ-II team
TL;DR
This study investigates how pellet injection affects particle transport in the TJ-II stellarator, showing that core depletion can be slowed even without pellet penetration into the core, aligning with neoclassical models.
Contribution
It provides experimental evidence and neoclassical simulation validation for particle transport behavior after pellet injection in stellarators.
Findings
Pellet injection can slow core depletion without reaching the core.
Experimental particle flux matches neoclassical predictions.
Pellet-induced transport effects are well captured by DKES and FORTEC-3D simulations.
Abstract
We study radial particle transport in stellarator plasmas using cryogenic pellet injection. By means of perturbative experiments, we estimate the experimental particle flux and compare it with neoclassical simulations. Experimental evidence is obtained of the fact that core depletion in helical devices can be slowed-down even by pellets that do not reach the core region. This phenomenon is well captured by neoclassical predictions with DKES and FORTEC-3D.
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