托卡马克离子温度梯度湍流输运同位素定标修正中杂质的影响

沈勇; 董家齐; 徐红兵

doi:10.7498/aps.67.20180703

摘要

托卡马克实验发现，在不同参数条件下，等离子体能量约束经验定标律会有或大或小的修正.为解释这种修正现象发生的原因，应用回旋动理学方法，对含重（钨）杂质等离子体离子温度梯度（ITG）（包括杂质模）湍流输运的同位素效应进行了数值研究.结果表明钨杂质效应极大地修改了同位素定标律和有效电荷效应.随着杂质离子电荷数Z和电荷集中度fz的变化，同位素定标律在较大范围内变化.ITG模最大增长率定标大约为Mi-0.48-0.12，杂质模的定标为Mi-0.46-0.3，其中，Mi表示主离子质量数.在ITG模湍流中，有效电荷数越大，关于Mi的拟合指数偏离-0.5越远，表现为同位素质量依赖减弱.在两种模中，杂质电荷集中度越大，同位素质量依赖越弱.研究了杂质效应使定标关系发生偏离的原因，证实杂质种类、杂质电荷数和杂质浓度的不同，是引起同位素质量依赖发生改变的重要原因.结果证实并解释了不同参数条件下托卡马克同位素定标的差异性.研究成果可以为ITER实验安排及杂质相关输运实验中选择装置材料、工作气体和设置其他参数提供理论参考.

关键词:

Abstract

Tokamak experiments show that the plasma empirical energy confinement scaling law varies with plasma ion mass (Ai) in a certain range under conditions of different plasma parameters or different devices. In order to understand such a modification of the empirical energy confinement scaling law, the isotope mass dependence of ion temperature gradient (ITG, including impurity modes) turbulence driven transport in the presence of tungsten impurity ions in tokamak plasma is studied by employing the gyrokinetic theory. The effect of heavy (tungsten) impurity ions on ITG and impurity mode is revealed to modify significantly the isotope mass dependence and effective charge effect. As the charge number of impurity ions (Z) or impurity charge concentration (fz) changes, the theoretical scaling law of ITG turbulence transport varies substantially in a relatively large range. The maximum growth rate of ITG mode scales as Mi-0.48 -0.12, whilst that of impurity mode scales as Mi-0.46 -0.3. Here, Mi is the mass number of primary ion in the plasma. In both cases the fitting index with Mi deviates further away from -0.5 when impurity charge concentration fz increases. The isotope mass dependence of ITG turbulence gradually weakens when the effective charge number Zeff increases. The isotope mass dependence of impurity mode turbulence also weakens with Zeff increasing for the same impurity ion charge number (Z). In contrast, the isotope mass dependence gradually strengthens with effective charge number Zeff increasing for the same impurity charge concentration (fz). On average, the maximum growth rates of impurity mode scale roughly as max~Mi-0.35Zeff1.5 and max~Mi-0.4Zeff1, respectively, for Zeff 3 and Zeff 3. The reason for the deviation of isotope scaling law from the normal case is investigated deliberately, and it is demonstrated that the isotope scaling index deviates from -0.5 more or less due to the fact that the impurity species, charge number and impurity concentrations vary in a certain range. These results demonstrate that it is impossible to deduce a unique isotope scaling law due to the variety of micro-instabilities and various plasma parameter regimes in tokamak plasma, which is consistent with the experimental observations. These results may contribute to the transport study involving heavy (tungsten) impurity ions in ITER discharge scenario investigation.

Keywords:

作者及机构信息

1.
核工业西南物理研究院, 成都 610041;

2.
浙江大学聚变理论与模拟中心, 杭州 310013

通信作者: 沈勇, sheny@swip.ac.cn

基金项目: 国家重点研发项目（批准号：2017YFE0300405）、国家自然科学基金（批准号：11475057）和四川省科技项目（批准号：2016JY0196）资助的课题.

Authors and contacts

1.
Southwestern Institute of Physics, Chengdu 610041, China;

2.
Institute for Fusion Theory and Simulation, Zhejiang Universtiy, Hangzhou 310013, China

Corresponding author: Shen Yong, sheny@swip.ac.cn

Funds: Project supported by the National Key RD Program of China (Grant No. 2017YFE0300405), the National Natural Science Foundation of China (Grant No. 11475057), and the Science and Technology Program of Sichuan Province, China (Grant No. 2016JY0196).

参考文献

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[20]	Shen Y, Dong J Q, Han M K, Sun A P, Shi Z B 2018 Nucl. Fusion 58 076007
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[29]	Coppi B 1991 Proceedings of the 13th International Conference in Plasma Physics and Controlled Nuclear Fusion Research Washington, USA, July 3-7, 1990 p413
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[31]	Chen L, Tsai S T 1983 Plasma Phys. 25 349

施引文献

[1]	Sokolov V, Sen A K 2002 Phys. Rev. Lett. 89 095001
[2]	Lorenzini R, Agostini M, Auriemma F, Carraro L, de Masi G, Fassina A, Franz P, Gobbin M, Innocente P, Puiatti M E, Scarin P, Zaniol B, Zuin M 2015 Nucl. Fusion 55 043012
[3]	Urano H, Takizuka T, Aiba N, Kikuchi M, Nakano T, Fujita T, Oyama N, Kamada Y, Hayashi N, the JT-6 Team 2013 Nucl. Fusion 53 083003
[4]	Sokolov V, Sen A K 2003 Phys. Plasmas 10 3174
[5]	Bessenrodt-Weberpals M, Wagner F, ASDEX Team 1993 Nucl. Fusion 33 1205
[6]	Yushmanov P N, Takizuka T, Riedel K S, Kardaun O J W F, Cordey J G, Kaye S M, Post D E 1990 Nucl. Fusion 30 1999
[7]	Goldston R 1984 Plasma Phys. Controll. Fusion 26 87
[8]	Hugill J, Sheffiled J 1978 Nucl. Fusion 18 15
[9]	Jacquinot J, the JET Team 1999 Plasma Phys. Control. Fusion 41 A13
[10]	ITER Physics Expert Groups on Confinement and Transport and Confinement Modelling and Databases, ITER Physics Basic Editors 1999 Nucl. Fusion 39 2175
[11]	Schneider P A, Bustos A, Hennequin P, Ryter F, Bernert M, Cavedon M, Dunne M G, Fischer R, Grler T, Happel T, Igochine V, Kurzan B, Lebschy A, McDermott R M, Morel P, Willensdorfer M, the ASDEX Upgrade Team, the EUROfusion MST1 Team 2017 Nucl. Fusion 57 066003
[12]	Du H L, Sang C F, Wang L, Sun J Z, Liu S C, Wang H Q, Zhang L, Guo H Y, Wang D Z 2013 Acta Phys. Sin. 62 245206 (in Chinese) [杜海龙, 桑超峰, 王亮, 孙继忠, 刘少承, 汪惠乾, 张凌, 郭后扬, 王德真 2013 物理学报 62 245206]
[13]	Itoh S I, Itoh K 2012 Chin. Phys. B 21 095201
[14]	Li Q L, Zheng Y Z, Cheng F Y, Deng X B, Deng D S, You P L, Liu G A, Chen X D 2001 Acta Phys. Sin. 50 507 (in Chinese) [李齐良, 郑永真, 程发银, 邓小波, 邓冬生, 游佩林, 刘贵昂, 陈向东 2001 物理学报 50 507]
[15]	Pusztai I, Mollen A, Fulop T, Candy J 2013 Plasma Phys. Control. Fusion 55 074012
[16]	Dong J Q, Horton W, Dorland W 1994 Phys. Plasmas 1 3635
[17]	Tokar M Z, Kalupin D, Unterberg B 2004 Phys. Rev. Lett. 92 215001
[18]	Connor J W, Pogutse O P 2001 Plasma Phys. Control. Fusion 43 155
[19]	Shen Y, Dong J Q, Sun A P, Qu H P, Lu G M, He Z X, He H D, Wang L F 2016 Plasma Phys. Control. Fusion 58 045028
[20]	Shen Y, Dong J Q, Han M K, Sun A P, Shi Z B 2018 Nucl. Fusion 58 076007
[21]	Lu H L, Wang S J 2009 Acta Phys. Sin. 58 354 (in Chinese) [陆赫林, 王顺金 2009 物理学报 58 354]
[22]	Zhang K, Cui Z Y, Sun P, Dong C F, Deng W, Dong Y B, Song S D, Jiang M, Li Y G, Lu P, Yang Q W 2016 Chin. Phys. B 25 065202
[23]	Zhou Q, Wang B N, Wu Z W, Huang J 2005 Chin. Phys. B 14 2539
[24]	Cui X W, Cui Z Y, Feng B B, Pan Y D, Zhou H Y, Sun P, Fu B Z, Lu P, Dong Y B, Gao J M, Song S D, Yang Q W 2013 Chin. Phys. B 22 125201
[25]	Pusztai I, Candy J, Gohil P 2011 Phys. Plasmas 18 122501
[26]	Guo W X, Wang L, Zhuang G 2016 Phys. Plasmas 23 112301
[27]	Xu W, Wan B N, Xie J K 2003 Acta Phys. Sin. 52 1970 (in Chinese) [徐伟, 万宝年, 谢纪康 2003 物理学报 52 1970]
[28]	Zhang H, Wen S L, Pan M, Huang Z, Zhao Y, Liu X, Chen J M 2016 Chin. Phys. B 25 056102
[29]	Coppi B 1991 Proceedings of the 13th International Conference in Plasma Physics and Controlled Nuclear Fusion Research Washington, USA, July 3-7, 1990 p413
[30]	Dominguez R R 1991 Nucl. Fusion 31 2063
[31]	Chen L, Tsai S T 1983 Plasma Phys. 25 349

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