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Numerical calculations of non-inductive current driven by microwaves in JET

机译：JET中微波驱动的非感应电流的数值计算

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Recent studies at JET focus on analysis of the lower hybrid (LH) wave power absorption and current drive (CD) calculations by means of a new ray tracing (RT)/Fokker-Planck (FP) package. The RT code works in real 2D geometry accounting for the plasma boundary and the launcher shape. LH waves with different parallel refractive index, N-vertical bar vertical bar, spectra in poloidal direction can be launched thus simulating authentic antenna spectrum with rows fed by different combinations of klystrons. Various FP solvers were tested most advanced of which is a relativistic bounce averaged FP code. LH wave power deposition profiles from the new RT/FP code were compared to the experimental results from electron cyclotron emission (ECE) analysis of pulses at 3.4 T low and high density. This kind of direct comparison between power deposition profiles from experimental ECE data and numerical model were carried out for the first time for waves in the LH range of frequencies. The results were in a reasonable agreement with experimental data at lower density, line averaged values of (n) over right arrow (e) approximate to 2.4 x 10(19) m(-3). At higher density, (n) over right arrow (e) approximate to 3 x 10(19) m(-3), the code predicted larger on-axis LH power deposition, which is inconsistent with the experimental observations. Both calculations were unable to produce LH wave absorption at the plasma periphery, which contradicts to the analysis of the ECE data and possible sources of these discrepancies have been briefly discussed in the paper. The code was also used to calculate the LH power deposition and CD profiles for the low-density preheat phase of JET's advanced tokamak (AT) scenario. It was found that as the density evolves from hollow to flat and then to a more peaked profile the LH power and driven current move inward i.e. towards the plasma axis. A total driven current of about 70 kA for 1 MW of launched LH power was predicted in these conditions.
机译：JET的最新研究重点在于通过新的射线追踪（RT）/ Fokker-Planck（FP）软件包对低混合（LH）波功率吸收和电流驱动（CD）计算进行分析。 RT代码以真实的2D几何形状工作，说明了等离子体边界和发射器形状。可以发射具有不同平行折射率的LH波，N垂直条，垂直条，沿极向方向的频谱，从而模拟由速调管的不同组合馈电的行的真实天线频谱。测试了各种FP求解器，其中最先进的是相对论反弹平均FP代码。将来自新RT / FP代码的LH波功率沉积曲线与来自3.4 T低密度和高密度脉冲的电子回旋加速器发射（ECE）分析的实验结果进行了比较。首次对LH频率范围内的波进行了这种由实验ECE数据得到的功率沉积曲线与数值模型之间的直接比较。结果与较低密度下的实验数据合理吻合，右箭头（e）上的（n）线平均值约为2.4 x 10（19）m（-3）。在较高的密度下，右箭头（e）上的（n）大约为3 x 10（19）m（-3），该代码预测较大的轴向LH功率沉积，这与实验观察结果不一致。两种计算均无法在等离子体外围产生LH波吸收，这与ECE数据的分析相矛盾，并且本文简要讨论了这些差异的可能来源。该代码还用于计算JET先进托卡马克（AT）场景的低密度预热阶段的LH功率沉积和CD曲线。已经发现，随着密度从中空发展到平坦然后再到更尖峰的轮廓，LH功率和驱动电流向内移动，即朝着等离子体轴移动。在这些条件下，对于1兆瓦LH功率，预计总驱动电流约为70 kA。

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