Fast detection of 14 MeV neutrons on the TFTR neutron collimator
Fast detection of 14 MeV neutrons on the TFTR neutron collimator
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DOI：
10.1063/1.1146615
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发表时间：
1995-12
影响因子：
1.6
通讯作者：
S. Goeler;A. Roquemore;L. C. Johnson;M. Bitter;M. Diesso;E. Fredrickson;D. Long;J. Strachan
中科院分区：
文献类型：
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作者：
S. Goeler;A. Roquemore;L. C. Johnson;M. Bitter;M. Diesso;E. Fredrickson;D. Long;J. Strachan
TFTR中子准直器的NE451 ZnS闪烁探测器的电流模式操作使我们能够以比脉冲计数模式快得多的速度和更高的精度记录径向中子发射剖面的发展。在高功率氘氚（DT）的操作过程中，检测器的痕迹上的固有散粒噪声是如此之低，我们可以观察到的不稳定性和中断具有良好的精度，此外，能够识别前体磁流体动力学（MHD）的活动和鱼骨不稳定性。这些结果表明，在ITER或TPX等未来的氚燃烧机中，中子准直器不仅应设计为径向聚变功率分布的监测器，而且还应设计为MHD活动的波探测器。
Current mode operation of the NE451 ZnS scintillation detectors of the TFTR neutron collimator has enabled us to record the development of radial neutron emission profiles with much faster speed and higher accuracy than in the pulse counting mode. During high power deuterium–tritium (DT) operation, the intrinsic shot noise on the detector traces was so low that we could observe sawtooth instabilities and disruptions with good precision and, in addition, were able to identify precursor magnetohydrodynamic (MHD) activity and fishbone instabilities. These results demonstrate that in future tritium burning machines like ITER or TPX, the neutron collimator should be designed not only as a monitor of radial fusion power profiles but also as a wave detector for MHD activity.