Electron-temperature (T_e) measurements in implosions provide valuable diagnostic information, as T_e is unaffected by residual flows and other non-thermal effects unlike ion temperature inferred from a fusion product spectrum. In OMEGA cryogenic implosions, measurement of T_e(t) can be used to investigate effects related to time-resolved hot-spot energy balance. The proposed diagnostic utilizes five fast-rise (∼15 ps) scintillator channels with distinct x-ray filtering. Titanium and stepped aluminum filtering were chosen to maximize detector sensitivity in the 10 keV–20 keV range, as it has been shown that these x rays have similar density and temperature weighting to the emitted deuterium–tritium fusion neutrons. Initial data collected using a prototype nosecone on the existing neutron temporal diagnostic demonstrate the validity of this diagnostic technique. The proposed system will be capable of measuring spatially integrated T_e(t) with 20 ps time resolution and <10% uncertainty at peak emission in cryogenic DT implosions.

中文翻译：

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多通道x射线时间诊断，用于测量OMEGA低温氘-tri内爆中时间分辨的电子温度

内爆中的电子温度（T _e）测量提供了有价值的诊断信息，因为T _e不受残余流量和其他非热效应的影响，这与从聚变产物谱推断出的离子温度不同。在OMEGA低温内爆中，T _e的测量（t）可用于研究与时间分辨的热点能量平衡有关的影响。提出的诊断方法利用五个快速上升的闪烁器通道（约15 ps），并具有独特的X射线过滤功能。选择钛和阶梯式铝过滤器可以最大程度地提高10 keV–20 keV范围内的探测器灵敏度，因为已经证明这些X射线的密度和温度权重与发射的氘-tri聚变中子相似。在现有的中子时间诊断中使用原型鼻锥收集的初始数据证明了这种诊断技术的有效性。拟议的系统将能够以20 ps的时间分辨率测量空间积分T _e（t），并且在低温DT内爆中峰值发射时的不确定度<10％。