Glebov V Yu, Eckart M J, Forrest C J, Grim G P, Hartouni E P, Hatarik R, Knauer J P, Moore A S, Regan S P, Sangster T C, Schlossberg D J, Stoeckl C
Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Rev Sci Instrum. 2018 Oct;89(10):10I122. doi: 10.1063/1.5035289.
A Cherenkov neutron time-of-flight (nTOF) detector developed and constructed at Lawrence Livermore National Laboratory was tested at 13 m from the target in a collimated line of sight (LOS) and at 5.3 m from the target in the open space inside the OMEGA Target Bay. Neutrons interacting with the quartz rod generate gammas, which through Compton scattering produce relativistic electrons that give rise to Cherenkov light. A photomultiplier tube (PMT) transferred the Cherenkov light into an amplified electrical signal. The Cherenkov nTOF detector consists of an 8-mm-diam, 25-cm quartz hexagonal prism coupled with a Hamamatsu gated PMT R5916U-52. The tests were performed with DT direct-drive implosions with cryogenic and room-temperature targets, producing a wide range of neutron yields and ion temperatures. The results of the tests and comparison with other nTOF detectors on OMEGA are presented. In the collimated LOS at 13 m from the target, the Cherenkov nTOF detector demonstrated good precision measurement in both the yield and ion temperature for DT yields above 3 × 10.
劳伦斯利弗莫尔国家实验室研发并制造的一台切伦科夫中子飞行时间（nTOF）探测器，在距靶13米的准直视线（LOS）中以及在欧米茄靶室内的开放空间中距靶5.3米处进行了测试。与石英棒相互作用的中子会产生伽马射线，伽马射线通过康普顿散射产生相对论电子，进而产生切伦科夫光。光电倍增管（PMT）将切伦科夫光转换为放大的电信号。切伦科夫nTOF探测器由一根直径8毫米、长25厘米的石英六角棱镜与一个滨松门控PMT R5916U - 52耦合而成。测试是在使用低温和室温靶的DT直接驱动内爆实验中进行的，产生了广泛的中子产额和离子温度范围。给出了测试结果以及与欧米茄上其他nTOF探测器的比较。在距靶13米的准直视线中，对于高于3×10的DT产额，切伦科夫nTOF探测器在产额和离子温度方面都展示了良好的精确测量。
