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首页> 外文期刊>Nuclear fusion >Study of lower hybrid current drive efficiency over a wide range of FTU plasma parameters
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Study of lower hybrid current drive efficiency over a wide range of FTU plasma parameters

机译：在各种FTU等离子体参数下降低混合电流驱动效率的研究

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The key quantities affecting the efficiency of Lower Hybrid (LH) radiofrequency waves in driving non-inductively the toroidal current in a tokamak have been recognized by means of a linear regression analysis over all the data available for the Frascati Tokamak Upgrade. The parameter space is bounded within the following ranges: line averaged plasma density 0.29 x 10~(20) ≤ n_e ≤ 1.29 x 10~(20) m~(-3), central electron temperatures 1.1 ≤ T_(e0) ≤ 7.4 keV, corresponding to volume averaged temperatures 0.27 ≤ < T_e > ≤ 1.2 keV, plasma current 0.3 ≤ I_p ≤ 0.7 MA, magnetic field 4 ≤ B_(T0) ≤ 7.2 T, with a safety factor between 4.7 ≤ q_a ≤ 10.7, LH power 0.4 ≤ P_(LH) ≤ 2.1 MW and LH parallel refraction index 1.32 ≤ N_(‖0) ≤ 2.42. The experimental current drive (CD) efficiency, reduced to the effective ion charge state Z_(eff) = 1, varies for this data set within 0.12 ≤ η_(CD)~* ≤ 0.34 AW~(-1) x 10~(20) m~(-2). A linear regression analysis gives a reliable scaling law for η_(CD)~* with a correlation coefficient close to 0.9 that points out the importance of the various quantities. The CD efficiency is a significantly increasing function of < T_e > and B_T, and a decreasing one of q_a and P_(LH), while N_‖ and n_e have limited influence. The physical reasons for the observed trend related to the variation of each parameter are recognized and discussed. The main causes are identified in the modification suffered by the N_‖ spectrum along the ray trajectory before the power can be absorbed by the electrons and in the interaction with the edge plasma density fluctuations. The analysis also allows putting into evidence the synergy between the LH and electron cyclotron waves, when the latter are absorbed directly on the LH generated suprathermal electron tails and produce the highest values of η_(CD)~*.
机译：通过对弗拉斯卡蒂·托卡马克升级可用的所有数据进行线性回归分析，已经认识到影响下混合（LH）射频波非感应地驱动托卡马克环形电流效率的关键因素。参数空间限制在以下范围内：线平均等离子体密度0.29 x 10〜（20）≤n_e≤1.29 x 10〜（20）m〜（-3），中心电子温度1.1≤T_（e0）≤7.4 keV ，对应于体积平均温度0.27≤≤1.2 keV，等离子电流0.3≤I_p≤0.7 MA，磁场4≤B_（T0）≤7.2 T，安全系数在4.7≤q_a≤10.7之间，LH功率0.4 ≤P_（LH）≤2.1 MW，LH平行折射率1.32≤N_（‖0）≤2.42。降低到有效离子电荷状态Z_（eff）= 1的实验电流驱动（CD）效率针对此数据集在0.12≤η_（CD）〜*≤0.34 AW〜（-1）x 10〜（20）之间变化）m〜（-2）。线性回归分析给出了η_（CD）〜*的可靠缩放定律，其相关系数接近0.9，指出了各种数量的重要性。 CD效率是和B_T的显着增加函数，是q_a和P_（LH）的减小之一，而N_′和n_e的影响有限。认识并讨论了与每个参数的变化相关的观测趋势的物理原因。主要原因是在功率被电子吸收之前沿着射线轨迹的N_'谱所遭受的修改以及与边缘等离子体密度波动的相互作用中确定的。该分析还可以证明当LH和电子回旋波直接吸收在LH上产生的超热电子尾部并产生最高的η_（CD）〜*值时，LH和电子回旋波之间具有协同作用。

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