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Linear microstability analysis of a low-Z impurity doped tokamak plasma

机译：低Z杂质掺杂托卡马克等离子体的线性微稳定性分析

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摘要

Improved electron and deuterium energy and particle confinement in the presence of low-Z impurities have been observed in many tokamaks under various experimental conditions. Peaked electron density profiles have been obtained in the Frascati Tokamak Upgrade (FTU) ohmic plasmas where a high concentration of lithium has been detected following the installation of a Liquid Lithium Limiter (LLL). This paper presents the results of a gyrokinetic study on the effects of lithium and other low-Z impurities on the linear stability of deuterium and electron temperature driven modes and their associated fluxes for plasma parameters such as those found in the core of LLL-FTU plasmas. Simulations show that a lithium concentration in excess of n_(li)_e = 15%, as estimated in the initial phase of a reference FTU discharge, is found to have a strong stabilizing effect on the TEM and high-frequency ETG modes. A significant stabilization of the electron driven modes can still be observed when the lithium concentration is reduced to 3%. In the presence of a significant impurity concentration (n_(li)_e = 3-15%) the long wavelength ITG modes drive an inward electron and deuterium flux and outward lithium flux. This process may lead eventually to an increased electron and deuterium density peaking and a reduced Z_(eff) (lithium density below n_(li)_e = 1%).
机译：在许多实验条件下，在许多托卡马克中观察到在低Z杂质存在下改善的电子和氘能以及颗粒限制​​。在Frascati Tokamak升级（FTU）欧姆等离子体中获得了峰值电子密度分布，在安装液态锂限制器（LLL）之后已检测到高浓度的锂。本文介绍了对锂和其他低Z杂质对氘和电子温度驱动模式及其相关通量的线性动力学影响的陀螺动力学研究的结果，这些通量用于等离子体参数，例如在LLL-FTU等离子体核心中发现的通量。仿真表明，在参考FTU放电的初始阶段估计，锂浓度超过n_（li）/ n_e = 15％，对TEM和高频ETG模式具有很强的稳定作用。当锂浓度降低到3％时，仍然可以观察到电子驱动模式的显着稳定。在存在显着杂质浓度（n_（li）/ n_e = 3-15％）的情况下，长波长ITG模式驱动向内电子和氘通量和向外锂通量。该过程可能最终导致电子和氘密度峰值增加，Z_（eff）降低（低于n_（li）/ n_e = 1％的锂密度）。

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  • 来源
    《Nuclear fusion》 |2011年第10期|p.103008.1-103008.9|共9页
  • 作者

    M. Romanelli; G. Szepesi; A.G. Peeters; MX. Apicella; M. Marinucci; C. Mazzotta; G. Mazzitelli; D. Frigione;

  • 作者单位

    Euratom/CCFE Fusion Association, Abingdon, Culham Science Center, OX14 3DB, UK;

    Euratom/CCFE Fusion Association, Abingdon, Culham Science Center, OX14 3DB, UK,CFSA, University of Warwick, Coventry, CV4 7AL, UK;

    University of Bayreuth, 95440 Bayreuth, Germany;

    Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche di Frascati, C.P. 65 00044 Frascati, Rome, Italy;

    Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche di Frascati, C.P. 65 00044 Frascati, Rome, Italy;

    Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche di Frascati, C.P. 65 00044 Frascati, Rome, Italy;

    Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche di Frascati, C.P. 65 00044 Frascati, Rome, Italy;

    Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche di Frascati, C.P. 65 00044 Frascati, Rome, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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