Pearcy J A, Russell L, Kabadi N V, Johnson T M, Adrian P A, Gatu-Johnson M, Casco E, Palmisano K, Gates G, Burgett T, Scott M, Petrasso R D, Li C K, Frenje J
Massachusetts Institute of Technology, Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
University of Rochester Laboratory for Laser Energetics, Rochester, New York 14611, USA.
Rev Sci Instrum. 2024 Oct 1;95(10). doi: 10.1063/5.0219482.
Measurement of proton spectra is an important diagnostic for a variety of high energy density physics experiments. Current diagnostics are either not designed to capture the spectrum of low-energy protons or are unsuitable for high debris experiments. To bridge the gap, a new CR-39 based compact magnetic spectrometer (MagSpec) has been developed to measure proton spectra in the 1-20 MeV energy range, with a particular focus on the low-energy (1-6 MeV) spectrum, for use in experiments at the OMEGA Laser Facility and the National Ignition Facility (NIF). In the MagSpec diagnostic, protons of different energies are dispersed as they pass through a magnetic field before impinging on a differentially filtered CR-39 surface, resulting in a spatial distribution of CR-39 tracks that corresponds to the energy spectrum. In this paper, we discuss details of the design and implementation of MagSpec on the NIF and OMEGA.
质子谱测量对于各种高能量密度物理实验而言是一项重要的诊断手段。当前的诊断方法要么并非设计用于捕获低能质子的能谱，要么不适用于高碎片实验。为了填补这一空白，已开发出一种新型的基于CR - 39的紧凑型磁谱仪（MagSpec），用于测量能量范围在1 - 20 MeV的质子谱，特别关注低能（1 - 6 MeV）能谱，以用于欧米茄激光装置（OMEGA Laser Facility）和国家点火装置（National Ignition Facility，NIF）的实验。在MagSpec诊断中，不同能量的质子在穿过磁场后撞击到经过差分滤波的CR - 39表面时会发生色散，从而产生与能谱相对应的CR - 39径迹的空间分布。在本文中，我们将讨论MagSpec在NIF和OMEGA上的设计与实施细节。
