Energy-angle distribution of the ions in the RF sheath of ICRH antennas

被引：8

作者：

Elias, M. ^{[1
]}

Curreli, D. ^{[1
]}

Myra, J. R. ^{[2
]}

机构：

[1] Univ Illinois, Nucl Plasma & Radiol Engn, Urbana, IL 61801 USA

[2] Lodestar Res Corp, 2400 Cent Ave, Boulder, CO 80301 USA

来源：

PHYSICS OF PLASMAS | 2021年 / 28卷 / 05期

关键词：

PLASMA; SIMULATIONS; IMPACT; EDGE;

D O I：

10.1063/5.0045962

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Radio-frequency sheaths forming at the surface of ion cyclotron resonance heating (ICRH) actuators in fusion experiments are associated with enhanced impurity sputtering from ICRH plasma-facing components (PFCs). The minimization of impurity fluxes from the ICRH PFC is a vital task for the usage of ICRH systems. Capturing the ion kinetics is important for an accurate description of plasma-material interactions, because the ion dynamics plays a crucial role in RF sheaths. Here, we present a hybrid particle-in-cell (hPIC) model able to capture the kinetic behavior of the ions. We analyze the kinetic ion energy-angle distributions (IEADs) impacting the RF antenna and its dependence on different plasma and RF sheath parameters. In particular, the IEAD dependence on RF frequency and magnetic field alignment is investigated. Using hPIC, we simulated a case emulating the latest experimental campaign from JET. The simulation showed that under specific plasma and RF parameters, the kinetic motion of ions results in a cusp formation in the IEAD.

引用

页数：9

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