AI 中文总结
该研究针对LID-QMS分析中激光光斑非圆形的问题，构建热脱附模型推导温度动态表达式，探究椭圆高斯激光束对钨样品氚脱附的影响及近似条件。
AI 中文摘要
激光诱导脱附四极质谱（LID-QMS）诊断被视为ITER第一壁氚 inventory远程控制的候选方法之一。涉及LID-QMS的研究通常假设分析表面上的激光光斑为圆形。与此同时，诊断用激光源无法始终定位为正入射辐照托卡马克瓦片，这导致激光光斑形状与圆形不同。在本研究中，我们分析了椭圆高斯激光束辐照样品时的氚去除过程，扩展了我们之前的分析结果[Stepanenko、Gasparyan，《Physica Scripta》99（8），085604（2025）]。构建了描述固体中热传输和氚去除的热脱附模型，推导了描述样品温度动态的新解析表达式。利用开发的模型研究了激光束/光斑椭圆度对钨样品氚脱附过程的影响，评估了可将椭圆束近似为圆形束以快速估算脱附氚量的条件。
英文摘要
Laser-induced-desorption quadrupole-mass-spectrometry (LID-QMS) diagnostics is considered as one of the candidate methods for the remote control of tritium inventory in the ITER first wall. Studies involving LID-QMS generally assume the circular shape of the laser spot on the analyzed surface. At the same time, the diagnostics laser source cannot be always positioned so as to irradiate tokamak tiles under normal angles, which results in the laser spot shape differing from the circular one. In this contribution, we analyze the tritium removal process under sample irradiation by an elliptic Gaussian laser beam, extending the results of our previous analysis [Stepanenko, Gasparyan, Physica Scripta 99 (8), 085604 (2025)]. The thermal desorption model governing the heat transport and tritium removal from the solid is formulated. The new analytical expression describing the sample temperature dynamics is derived. The developed model is used to examine the impact of the laser beam/spot ellipticity on the tritium desorption process from a tungsten sample. The conditions, under which the elliptic beam can be approximated with the circular one for the rapid assessment of the amount of desorbed tritium, are assessed.
