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首页> 外文期刊>Nuclear fusion >Penetration of supersonic gas jets into a tokamak
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Penetration of supersonic gas jets into a tokamak

机译：超声波气体射流渗透到托卡马克中

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The injection of high-pressure supersonic jets into the tokamak plasma is considered a promising method of future thermonuclear reactor fuelling and as a tool for disruption mitigation. Successful experiments were correspondingly performed on Tore Supra and DIII-D. In the present paper the evolution of such a jet is analysed. The jet expansion, deceleration of the ambient electrons and ions by the jet, self-consistent electric field, elementary processes, radiation and adiabatic cooling of the ambient plasma are taken into account. The jet is simulated by a MHD code, which is similar to the code previously used for pellets. It is demonstrated that the ionization degree of the jet strongly depends on the jet parameters. Several simulations were performed for the range of parameters typical for DIII-D. The jet of initial density 4 x 10(24) m(-3) remains almost neutral, and only the outer regions are ionized. When the initial jet density is reduced by a factor of 2 or more the main part of the jet becomes ionized rather fast. It is demonstrated that ionization at the jet edge in the poloidal (perpendicular to the magnetic field) direction of the jet is sufficient to stop poloidal expansion of the jet by (j) over right arrow x (B) over right arrow force. The final poloidal size of the jet remains of the order of its initial poloidal dimension (of the order of ten centimetres). The jet motion in the radial direction (direction of the injection) is provided by the polarization poloidal electric field and the corresponding (E) over right arrow x (B) over right arrow drift. In the paper two mechanisms of polarization reduction are considered: Alfven conductivity of the ambient plasma and the del B-induced drift. It is shown that an almost neutral jet can penetrate deep into the tokamak while a modest ionization degree should prevent its penetration for the case of low field side injection.
机译：向托卡马克等离子体中注入高压超音速射流被认为是未来热核反应堆加油的有前途的方法，并且是缓解干扰的工具。相应地，对Tore Supra和DIII-D进行了成功的实验。在本文中，分析了这种射流的演变。考虑了射流的膨胀，射流对环境电子和离子的减速，自洽电场，基本过程，环境等离子体的辐射和绝热冷却。射流由MHD代码模拟，该代码类似于先前用于颗粒的代码。结果表明，射流的电离度很大程度上取决于射流参数。针对DIII-D的典型参数范围执行了一些模拟。初始密度为4 x 10（24）m（-3）的射流几乎保持中性，只有外部区域被电离。当初始射流密度降低2倍或更多倍时，射流的主要部分将很快电离。已经证明，在射流的沿垂直方向（垂直于磁场）方向的射流边缘处的电离足以通过右箭头x上方的（j）超过右箭头力来停止射流的倍数膨胀。射流的最终多倍体尺寸保持其初始多倍体尺寸的数量级（大约十厘米）。沿径向（喷射方向）的射流运动是由极化极化电场和右箭头x上方的相应（E）x右箭头漂移上方的相应（E）提供的。在本文中，考虑了极化减少的两种机制：环境等离子体的Alfven电导率和del B诱导的漂移。结果表明，在低场侧注入的情况下，几乎中性的射流可以渗透到托卡马克的深处，而适度的电离度应防止其渗透。

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