Application of the coincidence counting technique to DD neutron spectrometry data at the NIF, OMEGA, and Z

作者：Lahmann B^*; Milanese L M; Han W; Johnson M Gatu; Seguin F H; Frenje J A; Petrasso R D; Hahn K D; Jones B

来源：Review of Scientific Instruments, 2016, 87(11): 11D801.

DOI：10.1063/1.4958910

A compact neutron spectrometer, based on a CH foil for the production of recoil protons and CR-39 detection, is being developed for the measurements of the DD-neutron spectrum at the NIF, OMEGA, and Z facilities. As a CR-39 detector will be used in the spectrometer, the principal sources of background are neutron-induced tracks and intrinsic tracks (defects in the CR-39). To reject the background to the required level for measurements of the down-scattered and primary DD-neutron components in the spectrum, the Coincidence Counting Technique (CCT) must be applied to the data. Using a piece of CR-39 exposed to 2.5-MeV protons at the MIT HEDP accelerator facility and DD-neutrons at Z, a significant improvement of a DD-neutron signal-to-background level has been demonstrated for the first time using the CCT. These results are in excellent agreement with previous work applied to DT neutrons. Published by AIP Publishing.

• 出版日期2016-11
• 单位MIT