Influence of collisions on parametric instabilities induced by lower hybrid waves in tokamak plasmas

被引：16

作者：

Castaldo, C. ^{[1
]}

Di Siena, A. ^{[2
]}

Fedele, R. ^{[2
]}

Napoli, F. ^{[3
,5
]}

Amicucci, L. ^{[1
]}

Cesario, R. ^{[1
]}

Schettini, G. ^{[4
]}

机构：

[1] ENEA, CR Frascati, Frascati, RM, Italy

[2] Univ Naples Federico II, Dipartimento Fis, Naples, Italy

[3] Ist Nazl Fis Nucl, I-80125 Naples, Italy

[4] Univ Lancaster, Dept Engn, Lancaster LA1 4YR, Lancs, England

[5] Univ Rome Tre, Dipartimento Ingn, I-00146 Rome, Italy

来源：

NUCLEAR FUSION | 2016年 / 56卷 / 01期

关键词：

lower hybrid waves; lower hybrid current drive; parametric instabilities; CURRENT DRIVE; MAGNETIC RIPPLE; DENSITY-FLUCTUATIONS; MODE CONVERSION; PROPAGATION; FREQUENCY; SCATTERING; ABSORPTION; TRANSPORT; RANGE;

D O I：

10.1088/0029-5515/56/1/016003

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：

Parametric instabilities induced at the plasma edge by lower hybrid wave power externally coupled to tokamak plasmas have, via broadening of the antenna spectrum, strong influence on the power deposition and current drive in the core. For modeling the parametric instabilities at the tokamak plasma edge in lower hybrid current drive experiments, the effect of the collisions has been neglected so far. In the present work, a specific collisional parametric dispersion relation, useful to analyze these nonlinear phenomena near the lower hybrid antenna mouth, is derived for the first time, based on a kinetic model. Numerical solutions show that in such cold plasma regions the collisions prevent the onset of the parametric instabilities. This result is important for present lower hybrid current drive experiments, as well as in fusion reactor scenarios.

引用

页数：13

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