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Title: Measurement of pulsed-power-driven magnetic fields via proton deflectometry

Measuring magnetic field and current distribution in Z-pinch plasma systems is crucial to the validation of Z-pinch theory. In this letter, the demonstration of proton deflectometry to pulsed-power-driven loads at the mega-amp scale is presented, which is capable of making more detailed field maps in high-density regions of plasmas. In this method, a laser-driven, broad-spectrum, MeV-energy proton beam is directed through a pulsed-power-driven plasma system, and the resulting deflections are measured to examine configuration of magnetic fields and to infer the currents that support them. The technique was first demonstrated on simple short-circuit loads, and the results are in excellent agreement with numerical simulations providing reliable estimates of the field and current configurations. It was then applied to a more complex—radial foil—plasma load. The measurements show unexpected proton deflections that exhibit the complexity of the plasma load and that with further analysis will reveal details about the current and magnetic field topology in this complex configuration.
Authors:
; ; ;  [1] ;  [2] ; ;  [3] ; ; ; ; ; ; ;  [4]
  1. Center for Energy Research, University of California, San Diego, California 92093-0411 (United States)
  2. General Atomics, San Diego, California 92121 (United States)
  3. Imperial College, London SW7 2AZ (United Kingdom)
  4. University of Nevada, Reno, Nevada 89557 (United States)
Publication Date:
OSTI Identifier:
22402445
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; LASERS; LINEAR Z PINCH DEVICES; MAGNETIC FIELDS; MEV RANGE; PLASMA; PROTON BEAMS; PROTONS; PULSES