skip to main content

SciTech ConnectSciTech Connect

Title: Ion probe beam experiments and kinetic modeling in a dense plasma focus Z-pinch

The Z-pinch phase of a dense plasma focus (DPF) emits multiple-MeV ions in a ∼cm length. The mechanisms through which these physically simple devices generate such high energy beams in a relatively short distance are not fully understood. We are exploring the origins of these large gradients using measurements of an ion probe beam injected into a DPF during the pinch phase and the first kinetic simulations of a DPF Z-pinch. To probe the accelerating fields in our table top experiment, we inject a 4 MeV deuteron beam along the z-axis and then sample the beam energy distribution after it passes through the pinch region. Using this technique, we have directly measured for the first time the acceleration of an injected ion beam. Our particle-in-cell simulations have been benchmarked on both a kJ-scale DPF and a MJ-scale DPF. They have reproduced experimentally measured neutron yields as well as ion beams and EM oscillations which fluid simulations do not exhibit. Direct comparisons between the experiment and simulations enhance our understanding of these plasmas and provide predictive design capability for accelerator and neutron source applications.
Authors:
; ; ; ; ; ; ;  [1] ;  [2]
  1. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore CA 94550 (United States)
  2. Voss Scientific, LLC, 418 Washington St SE, Albuquerque NM 87108 (United States)
Publication Date:
OSTI Identifier:
22390819
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1639; Journal Issue: 1; Conference: 9. International Conference on Dense Z Pinches, Napa, CA (United States), 3-7 Aug 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; BENCHMARKS; COMPARATIVE EVALUATIONS; DESIGN; DEUTERON BEAMS; ENERGY SPECTRA; ION PROBES; LINEAR Z PINCH DEVICES; MEV RANGE; NEUTRON SOURCES; OSCILLATIONS; PLASMA DENSITY; PLASMA FOCUS; PLASMA SIMULATION; YIELDS