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Determination of isotope ratio in the divertor of JET-ILW by high-resolution Hα spectroscopy: H-D experiment and implications for D-T experiment

机译:高分辨率Hα光谱法测定JET-ILW分光器中的同位素比:H-D实验及其对D-T实验的启示

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The data of the H alpha high-resolution spectroscopy, collected on the multiple lines of sight, which cover the entire divertor space in poloidal cross-section, during the recent hydrogen-deuterium experiments in JET-ILW (ITER-like wall), are processed. A strong spatial inhomogeneity of the hydrogen concentration, H/(H + D), in divertor is found in many pulses. Namely, the H/(H + D) ratio may be lower in the inner divertor than that in the outer divertor by the values of 0.15-0.35, depending on the conditions of gas puffing and plasma heating. This effect suggests the necessity of spatially-resolved measurements of isotope ratio in the divertor in the upcoming deuterium-tritium experiments. Also, separation of the overlapped T alpha and D alpha spectral lines is shown to be a challenging task especially when the local Doppler-broadened (Gaussian) line shapes are noticeably distorted by the net inward flux of fast non-Maxwellian neutral atoms. We use the respective, formerly developed model of an asymmetric spectral line shape, while analysing the data of the first deuterium-tritium experiment in JET-C (carbon wall), and test the model via comparing the isotope ratio results with another diagnostic's measurements. This model is shown to increase the accuracy of tritium concentration measurements in the divertor.
机译:在最近的JET-ILW(ITER样壁)氢-氘实验中,从多条视线收集的H alpha高分辨率光谱数据覆盖了极向截面的整个偏滤器空间。处理。在许多脉冲中发现了偏滤器中氢浓度H /(H + D)的强烈空间不均匀性。即,取决于气体吹气和等离子体加热的条件,内部分流器中的H /(H + D)比可以比外部分流器中的H /(H + D)比低0.15-0.35。这种影响表明在即将进行的氘-tri实验中,需要对分流器中的同位素比率进行空间分辨测量。同样,分离重叠的Tα和Dα光谱线被证明是一项艰巨的任务,尤其是当局部多普勒展宽(高斯)线形状明显受到快速非麦克斯韦中性原子净内向通量的扭曲时。我们在分析JET-C(碳壁)中第一个氘-tri实验的数据时,使用了各自先前开发的不对称谱线形状的模型,并通过将同位素比结果与另一种诊断方法的测量结果进行比较来测试该模型。结果表明,该模型提高了偏滤器中concentration浓度的测量精度。

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