Varying stopping and self-focusing of intense proton beams as they heat solid density matter
Abstract
Transport of intense proton beams in solid-density matter is numerically investigated using an implicit hybrid particle-in-cell code. Both collective effects and stopping for individual beam particles are included through the electromagnetic fields solver and stopping power calculations utilizing the varying local target conditions, allowing self-consistent transport studies. Two target heating mechanisms, the beam energy deposition and Ohmic heating driven by the return current, are compared. The dependences of proton beam transport in solid targets on the beam parameters are systematically analyzed, i.e., simulations with various beam intensities, pulse durations, kinetic energies, and energy distributions are compared. The proton beam deposition profile and ultimate target temperature show strong dependence on intensity and pulse duration. A strong magnetic field is generated from a proton beam with high density and tight beam radius, resulting in focusing of the beam and localized heating of the target up to hundreds of eV.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 01, 2016
- Source ID
- 10.1063/1.4945617
Entities
People
- B. Kim
- B. Qiao
- Chris Mcguffey
- Farhat Nadeem Beg
- M. S. Wei
- P. E. Grabowski
Organizations
- Air Force Office of Scientific Research
- General Atomics
- United States Department of Energy
- University of California
- University of California, San Diego