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首页> 外文会议>International Conference on Advanced Diagnostics for Magnetic and Inertial Fusion, Sep 3-7, 2001, Varenna Italy >LASER FUSION FUEL ION TEMPERATURE DIAGNOSTICS
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LASER FUSION FUEL ION TEMPERATURE DIAGNOSTICS

机译：激光熔融燃料离子温度诊断

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摘要

The fusion fuel ion temperature is a very important implosion dynamics parameter in initial confinement fusion (ICF) research. It is often determined by the neutron time of flight (TOF) technique, which utilizes the neutron Doppler broadening due to the center-of-mass motion of the reacting ions in the fusion fuel. However, the relative yield method has an advantage when the neutron yield is low. On this condition the detector must be placed at a closer distance from the fuel-filled implosion capsule for enough statistical counts, which will cause a narrower neutron TOF width and thus a greater error as the detection system has a certain response time. But it is possible to employ a suitable fuel mixture in which different reactions occur simultaneously although the implosion neutron yield is sensitive not only to the ion temperature alone. Supposing that the final density ratio of the different fusion fuel components in the compressed microballoon core remains constant as compared with the initial one, the relative yield depends only on the ratio of averaged <σv> for the different reactions, where σ and v denote the reaction cross section and the relative velocity, respectively. Since the dependence of <σv> on temperature is different for different reactions, the relative yield ratio can reflect the ion temperature.
机译：聚变燃料离子温度是初始约束聚变（ICF）研究中非常重要的内爆动力学参数。它通常由中子飞行时间（TOF）技术确定，该技术利用中子多普勒展宽是由于聚变燃料中反应离子的质心运动。然而，当中子产率低时，相对产率法具有优势。在这种情况下，必须将检测器放置在距离填充燃料的内爆盒更近的距离处，以进行足够的统计计数，这将导致中子TOF宽度变窄，并且由于检测系统具有一定的响应时间，因此会导致更大的误差。但是有可能使用其中不同反应同时发生的合适的燃料混合物，尽管内爆中子的产生不仅对离子温度敏感。假设压缩微气球核心中不同聚变燃料组分的最终密度比与初始密度比保持恒定，则相对产率仅取决于不同反应的平均<σv>之比，其中σ和v表示反应截面和相对速度。由于<σv>对温度的依赖性对于不同的反应是不同的，因此相对产率可以反映离子温度。

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