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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Radiated power and impurity concentrations in the EXTRAP-T2R reversed-field pinch
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Radiated power and impurity concentrations in the EXTRAP-T2R reversed-field pinch

机译：EXTRAP-T2R反向电场夹点中的辐射功率和杂质浓度

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摘要

A numerical and experimental study of the impurity concentration and radiation in the EXTRAP-T2R device is reported. The experimental setup consists of an 8-chord bolometer system providing the plasma radiated power and a vacuum-ultraviolet spectrometer providing information on the plasma impurity content. The plasma emissivity profile as measured by the bolometric system is peaked in the plasma centre. A one dimensional Onion Skin Collisional-Radiative model (OSCR) has been developed to compute the density and radiation distributions of the main impurities. The observed centrally peaked emissivity profile can be reproduced by OSCR simulations only if finite particle confinement time and charge-exchange processes between plasma impurities and neutral hydrogen are taken into account. The neutral hydrogen density profile is computed with a recycling code. Simulations show that recycling on metal first wall such as in EXTRAP-T2R (stainless steel vacuum vessel and molybdenum limiters) is compatible with a rather high neutral hydrogen density in the plasma centre. Assuming an impurity concentration of 10% for oxygen and 3% for carbon compared with the electron density, the OSCR calculation including lines and continuum emission reproduces about 60% of the total radiated power with a similarly centrally peaked emmissivity profile. The centrally peaked emissivity profile is due to low ionisation stages and strongly radiating species in the plasma core, mainly O4+ (Be-like) and C3+ (Li-like).
机译：报道了EXTRAP-T2R装置中杂质浓度和辐射的数值和实验研究。实验装置由一个提供等离子辐射功率的8线辐射热测量系统和一个提供有关血浆杂质含量信息的真空紫外光谱仪组成。由辐射热测量系统测得的等离子体发射率曲线在血浆中心达到峰值。已开发出一维洋葱皮肤碰撞辐射模型（OSCR），以计算主要杂质的密度和辐射分布。仅当考虑到有限的粒子限制时间以及等离子体杂质与中性氢之间的电荷交换过程时，才能通过OSCR模拟重现观察到的中心峰发射率曲线。用回收码计算中性氢密度分布。模拟表明，在金属第一壁（例如EXTRAP-T2R）（不锈钢真空容器和钼限制器）中的回收与等离子体中心中相当高的中性氢密度兼容。假设与电子密度相比，氧的杂质浓度为10％，碳的杂质浓度为3％，则包括线和连续发射的OSCR计算将产生总辐射功率的60％，并且具有类似的中心峰值发射率曲线。中心达到峰值的发射率曲线是由于等离子体核心中的低电离阶段和强辐射物种所致，主要是O4 +（类似于Be）和C3 +（类似于Li）。

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