Ion cyclotron resonance heating with shifted separatrix

被引：2

作者：

Kolesnichenko, Ya. I. ^{[1
]}

Patten, H. ^{[2
,3
]}

Lutsenko, V. V. ^{[1
]}

Graves, J. P. ^{[2
]}

Rudenko, T. S. ^{[1
]}

机构：

[1] Inst Nucl Res, Prospekt Nauky 47, UA-03028 Kiev, Ukraine

[2] Ecole Polytech Fed Lausanne, Swiss Plasma Ctr, CH-1015 Lausanne, Switzerland

[3] Univ Oxford, Dept Stat, Oxford OX1 3LB, England

来源：

NUCLEAR FUSION | 2021年 / 61卷 / 04期

基金：

瑞士国家科学基金会;

关键词：

ion cyclotron resonance heating (ICRH); quasilinear equation; quasilinear routes; separatrix; numerical simulation; passing paricles; trapped particles;

D O I：

10.1088/1741-4326/abdfdc

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：

Ion cyclotron resonance heating, which we refer to as ICRH-SS, with the quasilinear (QL) separatrix (i.e., the separatrix in the space of QL routes of ion acceleration) located in the region of passing particles is studied. The aim of ICRH-SS is to minimize the fraction of trapped particles (particles with small longitudinal velocities) in the population of fast ions. The basic idea of ICRH-SS-shifting the separatrix to the region of passing particles-was advanced in the paper (Kolesnichenko et al 2017 Nuclear Fusion 57 066004). In this work, new features of ICRH-SS are revealed. The 3D QL routes of the particle acceleration and effects of Coulomb collisions are studied. A QL equation for distribution function of neutral beam injection (NBI) ions, which is convenient for analysis, is derived. Conditions for QL flux prevailing over collisional flux caused by pitch scattering are obtained. Numerical simulations using the SCENIC package are carried out for a JET plasma with NBI ions that are accelerated by RF field in the core region. A JET pulse designed as a demonstration of the so called 'three ions' scheme, which also complies with the criteria of ICRH-SS scheme, was selected. The numerical results show that in the considered example most accelerated ions have larger longitudinal velocities and fast particle orbits are passing during ICRH-SS, whereas, 'conventional' ICRH (defined as ICRH with the separatrix in the region of trapped particles) produces accelerated ions with banana orbits. Numerical results also show an increase in fast ion generation and core plasma heating performance for ICRH-SS as compared to the conventional ICRH.

引用

页数：15

共 27 条

[1] Stochastic diffusion of energetic ions in optimized stellarators [J].

Beidler, CD ;

Kolesnichenko, YI ;

Marchenko, VS ;

Sidorenko, IN ;

Wobig, H .

PHYSICS OF PLASMAS, 2001, 8 (06) :2731-2738

[2] QUASI-LINEAR THEORY FOR A TOKAMAK PLASMA IN THE PRESENCE OF CYCLOTRON-RESONANCE [J].

BELIKOV, VS ;

KOLESNICHENKO, YI .

PLASMA PHYSICS AND CONTROLLED FUSION, 1994, 36 (11) :1703-1718

[3] Numerical simulation of ion cyclotron waves in tokamak plasmas [J].

Brambilla, M .

PLASMA PHYSICS AND CONTROLLED FUSION, 1999, 41 (01) :1-34

[4] Evidence for a wave-induced particle pinch in the presence of toroidally asymmetric ICRF waves [J].

Eriksson, LG ;

Mantsinen, M ;

Borba, D ;

Fasoli, A ;

Heeter, R ;

Sharapov, S ;

Start, DFH ;

Carlsson, J ;

Gondhalekar, A ;

Hellsten, T ;

Korotkov, A .

PHYSICAL REVIEW LETTERS, 1998, 81 (06) :1231-1234

[5] CONFINEMENT OF HIGH-ENERGY TRAPPED-PARTICLES IN TOKAMAKS [J].

GOLDSTON, RJ ;

WHITE, RB ;

BOOZER, AH .

PHYSICAL REVIEW LETTERS, 1981, 47 (09) :647-649

[6] Effects of finite drift orbit width and RF-induced spatial transport on plasma heated by ICRH [J].

Hellsten, T ;

Johnson, T ;

Carlsson, J ;

Eriksson, LG ;

Hedin, J ;

Laxåback, ML ;

Mantsinen, M .

NUCLEAR FUSION, 2004, 44 (08) :892-908

[7] Integrated modeling for ion cyclotron resonant heating in toroidal systems [J].

Jucker, M. ;

Graves, J. P. ;

Cooper, W. A. ;

Mellet, N. ;

Johnson, T. ;

Brunner, S. .

COMPUTER PHYSICS COMMUNICATIONS, 2011, 182 (04) :912-925

[8] Plasma heating and generation of energetic D ions with the 3-ion ICRF + NBI scenario in mixed H-D plasmas at JET-ILW [J].

Kazakov, Ye. O. ;

Nocente, M. ;

Mantsinen, M. J. ;

Ongena, J. ;

Baranov, Y. ;

Craciunescu, T. ;

Dreval, M. ;

Dumont, R. ;

Eriksson, J. ;

Garcia, J. ;

Giacomelli, L. ;

Kiptily, V. G. ;

Kirov, K. K. ;

Meneses, L. ;

Nabais, F. ;

Nave, M. F. F. ;

Salewski, M. ;

Sharapov, S. E. ;

Stancar, Z. ;

Varje, J. ;

Weisen, H. .

NUCLEAR FUSION, 2020, 60 (11)

[9] On resonant ICRF absorption in three-ion component plasmas: a new promising tool for fast ion generation [J].

Kazakov, Ye. O. ;

Van Eester, D. ;

Dumont, R. ;

Ongena, J. .

NUCLEAR FUSION, 2015, 55 (03)

[10] Synergistic ICRH and NBI Heating for Fast Ion Generation and Maximising Fusion Rate in Mixed Plasmas at JET [J].

Kirov, K. K. ;

Kazakov, Y. ;

Nocente, M. ;

Ongena, J. ;

Baranov, Y. ;

Casson, F. ;

Eriksson, J. ;

Giacomelli, L. ;

Hellesen, C. ;

Kiptily, V ;

Bilato, R. ;

Crombe, K. ;

Dumont, R. ;

Jacquet, P. ;

Johnson, T. ;

Lerche, E. ;

Mantsinen, M. ;

Van Eester, D. ;

Varje, J. ;

Weisen, H. .

23RD TOPICAL CONFERENCE ON RADIOFREQUENCY POWER IN PLASMAS, 2020, 2254

← 1 2 3 →