skip to main content

Title: Effect of Current Rise-time on the Formation of Precursor Structures and Mass Ablation Rate in Cylindrical Wire Array Z-Pinches

We present the first study to directly compare the mass ablation rates of cylindrical wire arrays as a function of the current rise-rate. Formation of the precursor column is investigated on both the MAPGIE (1 MA, 250 ns) and COBRA (1 MA, 100 ns) generators, and results are used to infer the change in the mass ablation rate induced by the rise-rate of the drive current. Laser shadowography, gated XUV imaging and x-ray diodes are used to compare the dynamical behavior both generators, and x-pinch radiography and XUV spectroscopy and provide density evolution and temperature measurements respectively. Results are compared to predictions from an analytical scaling model based on a fixed ablation rate, and the close correlation achieved suggests that the effective ablation velocity is not a strong function of the current rise rate.
Authors:
; ;  [1] ; ;  [2] ; ; ; ; ; ; ; ; ; ;  [3] ; ; ; ; ;  [4]
  1. Center for Energy Research, University of California San Diego, La Jolla CA 92093 (United States)
  2. Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla CA 92093 (United States)
  3. Laboratory of Plasma Studies, Cornell University, NY 14853 (United States)
  4. Blackett Laboratory, Imperial College London, SW7 2BW (United Kingdom) (and others)
Publication Date:
OSTI Identifier:
21255353
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1088; Journal Issue: 1; Conference: 7. international conference on dense Z-pinches, Alexandria, VA (United States), 12-21 Aug 2008; Other Information: DOI: 10.1063/1.3079743; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABLATION; COMPARATIVE EVALUATIONS; CORRELATIONS; CYLINDRICAL CONFIGURATION; EVOLUTION; EXTREME ULTRAVIOLET RADIATION; FORECASTING; LASERS; LINEAR Z PINCH DEVICES; MASS; PLASMA HEATING; PULSE RISE TIME; SPECTROSCOPY; TEMPERATURE MEASUREMENT; WIRES