Simulation of the Plasma Density Evolution during Electron Cyclotron Resonance Heating at the T-10 Tokamak

被引：3

作者：

Dnestrovskij, Yu N. ^{[1
]}

Vershkov, V. A. ^{[1
]}

Danilov, A. V. ^{[1
]}

Dnestrovskij, A. Yu ^{[1
]}

Zenin, V. N. ^{[1
]}

Lysenko, S. E. ^{[1
]}

Melnikov, A. V. ^{[1
]}

Shelukhin, D. A. ^{[1
]}

Subbotin, G. F. ^{[1
]}

Cherkasov, S. V. ^{[1
]}

机构：

[1] Natl Res Ctr Kurchatov Inst, Moscow 123182, Russia

来源：

PLASMA PHYSICS REPORTS | 2018年 / 44卷 / 01期

基金：

俄罗斯基础研究基金会; 俄罗斯科学基金会;

关键词：

PRESSURE PROFILES;

D O I：

10.1134/S1063780X18010051

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：

In ohmically heated (OH) plasma with low recycling, an improved particle confinement (IPC) mode is established during gas puffing. However, after gas puffing is switched off, this mode is retained only for about 100 ms, after which an abrupt phase transition into the low particle confinement (LPC) mode occurs in the entire plasma cross section. During such a transition, energy transport due to heat conduction does not change. The phase transition in OH plasma is similar to the effect of density pump-out from the plasma core, which occurs after electron cyclotron heating (ECH) is switched on. Analysis of the measured plasma pressure profiles in the T-10 tokamak shows that, after gas puffing in the OH mode is switched off, the plasma pressure profile in the IPC stage becomes more peaked and, after the peakedness exceeds a certain critical value, the IPC-LPC transition occurs. Similar processes are also observed during ECH. If the pressure profile is insufficiently peaked during ECH, then the density pump-out effect comes into play only after the critical peakedness of the pressure profile is reached. In the plasma core, the density and pressure profiles are close to the corresponding canonical profiles. This allows one to derive an expression for the particle flux within the canonical profile model and formulate a criterion for the IPC-LPC transition. The time evolution of the plasma density profile during phase transitions was simulated for a number of T-10 shots with ECH and high recycling. The particle transport coefficients in the IPC and LPC phases, as well as the dependences of these coefficients on the ECH power, are determined.

引用

页码：1 / 17

页数：17

共 22 条

[1] Experimental study of density pump-out effect with on-axis electron cyclotron resonance heating at the T-10 tokamak [J].

Andreev, V. F. ;

Borschegovskij, A. A. ;

Chistyakov, V. V. ;

Dnestrovskij, Yu N. ;

Gorbunov, E. P. ;

Kasyanova, N. V. ;

Lysenko, S. E. ;

Melnikov, A. V. ;

Myalton, T. B. ;

Roy, I. N. ;

Sergeev, D. S. ;

Zenin, V. N. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2016, 58 (05)

[2] Density response to central electron heating: theoretical investigations and experimental observations in ASDEX Upgrade [J].

Angioni, C ;

Peeters, AG ;

Garbet, X ;

Manini, A ;

Ryter, F .

NUCLEAR FUSION, 2004, 44 (08) :827-845

[3] Particle transport in tokamak plasmas, theory and experiment [J].

Angioni, C. ;

Fable, E. ;

Greenwald, M. ;

Maslov, M. ;

Peeters, A. G. ;

Takenaga, H. ;

Weisen, H. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2009, 51 (12)

[4] Transport analysis and modelling of the evolution of hollow density profiles plasmas in JET and implication for ITER [J].

Baiocchi, B. ;

Bourdelle, C. ;

Angioni, C. ;

Imbeaux, F. ;

Loarte, A. ;

Maslov, M. ;

Abhangi, M. ;

Abreu, P. ;

Aftanas, M. ;

Afzal, M. ;

Aggarwal, K. M. ;

Aho-Mantila, L. ;

Ahonen, E. ;

Aints, M. ;

Airila, M. ;

Albanese, R. ;

Alegre, D. ;

Alessi, E. ;

Aleynikov, P. ;

Alfier, A. ;

Alkseev, A. ;

Allan, P. ;

Almaviva, S. ;

Alonso, A. ;

Alper, B. ;

Alsworth, I. ;

Alves, D. ;

Ambrosino, G. ;

Ambrosino, R. ;

Amosov, V. ;

Andersson, F. ;

Andersson Sunden, E. ;

Angelone, M. ;

Anghel, A. ;

Anghel, M. ;

Angioni, C. ;

Appel, L. ;

Apruzzese, G. ;

Arena, P. ;

Ariola, M. ;

Arnichand, H. ;

Arnoux, G. ;

Arshad, S. ;

Ash, A. ;

Asp, E. ;

Asunta, O. ;

Atanasiu, C. V. ;

Austin, Y. ;

Avotina, L. ;

Axton, M. D. .

NUCLEAR FUSION, 2015, 55 (12)

[5]

Biskamp D., 1986, Comments on Plasma Physics and Controlled Fusion, V10, P165

[6]

Coppi B., 1980, MM PLASMA PHYS CONTR, V5, P261

[7] ENERGY CONFINEMENT IN THE T-10 TOKAMAK AND CANONIC PROFILE MODELS [J].

DNESTROVSKII, YN ;

PEREVERZEV, GV .

PLASMA PHYSICS AND CONTROLLED FUSION, 1988, 30 (11) :1417-1430

[8] Canonical profiles in tokamak plasmas with an arbitrary cross section [J].

Dnestrovskij, YN ;

Dnestrovskij, AY ;

Lysenko, SE ;

Cherkasov, SV .

PLASMA PHYSICS REPORTS, 2002, 28 (11) :887-899

[9] Analysis of pressure profiles and transport simulations of MAST discharges [J].

Dnestrovskij, Yu N. ;

Connor, J. W. ;

Cherkasov, S. V. ;

Danilov, A. V. ;

Dnestrovskij, A. Yu ;

Lysenko, S. E. ;

Roach, C. M. ;

Walsh, M. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2007, 49 (09) :1477-1496

[10] Simulation of plasma density evolution in the T-10 tokamak [J].

Dnestrovskij, Yu. N. ;

Vershkov, V. A. ;

Danilov, A. V. ;

Dnestrovskij, A. Yu. ;

Zenin, V. N. ;

Lysenko, S. E. ;

Melnikov, A. V. ;

Shelukhin, D. A. ;

Subbotin, G. F. ;

Cherkasov, S. V. .

PLASMA PHYSICS REPORTS, 2016, 42 (03) :191-209

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