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首页> 外文学位 >Time and Energy Characterization of a Neutron Time of Flight Detector Using a Novel Coincidence Method for Constraining Neutron Yield, Ion Temperature and Liner Density Measurements from MagLIF Experiments
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Time and Energy Characterization of a Neutron Time of Flight Detector Using a Novel Coincidence Method for Constraining Neutron Yield, Ion Temperature and Liner Density Measurements from MagLIF Experiments

机译：利用新型巧合方法限制中子产率，离子温度和衬里密度的MagLIF实验，对中子飞行时间探测器的时间和能量进行表征

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摘要

The focus of this work is the characterization of a typical neutron time-of-flight (NTOF) detector that is fielded on inertial confinement fusion (ICF) experiments conducted at the Z-experimental facility with emphasis on the Magnetized Liner Fusion (MagLIF) concept. An NTOF detector consisting of EJ-228 scintillator and two independent photomultiplier tubes (PMTs), a Hamamatsu-mod 5 and Photek-PMT240, has been characterized in terms of the absolute time and energy response. The characterization was done by measuring single, neutron-induced events in the scintillator by measuring the alpha particle and neutron produced from the D-T reaction in kinematic coincidence. The results of these experiments provided the time dependent instrument response function and the detector sensitivity as a function of applied voltage covering the entire dynamic range of the detector. Historically, impulse response functions have been measured using various photon sources as surrogates for a neutron source. Thus, this measurement using a single hit neutron source results in the most accurate measured response function, which will improve the accuracy of impulse response corrections to the NTOF signals.;While this detector has not yet been fielded on any MagLIF experiments, the development of a predictive capability was desired for transferring the measured detector response from the calibration geometry to the more complex Z geometry. As a proof-of-principle, a detailed model of the Z-machine was developed in MCNP6 to correct for geometry issues when transferring the calibration results from a light lab setting to the Z-environment. Representative values for the instrument response function and the sensitivity for the current detectors fielded on MagLIF experiments were convolved with the modeled results. These results were compared with data collected on three previous MagLIF experiments. The comparison shows the model results can be used to constrain three parameters that are relevant for diagnosing the plasma performance and confinement---the plasma ion temperature, the beryllium liner areal density, and the neutron yield---which significantly enhances the information that can be obtained from the Z NTOF signals. The model also clarifies the source of features that have been observed in the NTOF signs that were not well understood before. In addition, this capability and methodology can be used to re-design the source to detector lines-of-sight such that the magnitudes of the required corrections are minimized.
机译：这项工作的重点是表征典型的中子飞行时间（NTOF）检测器，该检测器应用于Z实验设施进行的惯性约束聚变（ICF）实验，重点是磁化衬里聚变（MagLIF）概念。由绝对时间和能量响应表征了由EJ-228闪烁体和两个独立的光电倍增管（PMT）（即Hamamatsu-mod 5和Photek-PMT240）组成的NTOF检测器。表征是通过测量闪烁体中单个中子诱发的事件来完成的，该事件是通过测量运动学巧合中D-T反应产生的α粒子和中子来进行的。这些实验的结果提供了随时间变化的仪器响应函数和检测器灵敏度，该灵敏度与所施加电压的函数有关，覆盖了检测器的整个动态范围。历史上，已经使用各种光子源作为中子源的替代物来测量脉冲响应函数。因此，使用单个撞击中子源进行的这种测量可以得到最准确的测量响应函数，这将提高对NTOF信号的脉冲响应校正的准确性。虽然此探测器尚未在任何MagLIF实验中投入使用，为了将测得的检测器响应从校准几何转换为更复杂的Z几何，需要具有预测能力。作为原理证明，在MCNP6中开发了Z机的详细模型，以在将校准结果从轻型实验室设置转移到Z环境时纠正几何问题。仪器响应函数的代表值和在MagLIF实验中获得的电流检测器的灵敏度与模型化结果进行了卷积。将这些结果与之前三个MagLIF实验收集的数据进行了比较。比较结果表明，模型结果可用于约束与诊断等离子体性能和约束有关的三个参数-等离子体离子温度，铍衬里面密度和中子收率-极大地增强了信息可以从Z NTOF信号获得。该模型还阐明了NTOF标志中观察到的特征的来源，而这些特征以前并未得到很好的理解。另外，这种能力和方法可以用于重新设计源到探测器的视线，以使所需校正的幅度最小化。

著录项

  • 作者

    Styron, Jedediah D.;

  • 作者单位

    The University of New Mexico.;

  • 授予单位 The University of New Mexico.;
  • 学科 Nuclear physics and radiation.;Nuclear engineering.;Engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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