Detailed characterization of the LLNL imaging proton spectrometer

A M Rasmus; A U Hazi; M J-E Manuel; C C Kuranz; S R Klein; P X Belancourt; J R Fein; M J MacDonald; R P Drake; B B Pollock; J Park; G J Williams; H Chen

doi:10.1063/1.4962045

Detailed characterization of the LLNL imaging proton spectrometer

Rev Sci Instrum. 2016 Nov;87(11):11D831. doi: 10.1063/1.4962045.

Authors

A M Rasmus¹, A U Hazi², M J-E Manuel³, C C Kuranz³, S R Klein³, P X Belancourt³, J R Fein³, M J MacDonald³, R P Drake³, B B Pollock², J Park², G J Williams², H Chen²

Affiliations

¹ Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA.
² Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
³ University of Michigan, Ann Arbor, Michigan 48109, USA.

PMID: 27910335
DOI: 10.1063/1.4962045

Abstract

Ultra-intense short pulse lasers incident on solid targets (e.g., thin Au foils) produce well collimated, broad-spectrum proton beams. These proton beams can be used to characterize magnetic fields, electric fields, and density gradients in high energy-density systems. The LLNL-Imaging Proton Spectrometer (L-IPS) was designed and built [H. Chen et al., Rev. Sci. Instrum. 81, 10D314 (2010)] for use with such laser produced proton beams. The L-IPS has an energy range of 50 keV-40 MeV with a resolving power (E/dE) of about 275 at 1 MeV and 21 at 20 MeV, as well as a single spatial imaging axis. In order to better characterize the dispersion and imaging capability of this diagnostic, a 3D finite element analysis solver is used to calculate the magnetic field of the L-IPS. Particle trajectories are then obtained via numerical integration to determine the dispersion relation of the L-IPS in both energy and angular space.