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Title: Dynamics of hybrid X-pinches

The dynamics of a new type of pinches—hybrid X-pinches (HXPs)—has been studied experimentally and numerically. The initial configuration of an HXP consists of a high-current diode with conical tungsten electrodes separated by a 1- to 3-mm-long gap and shunted with a 20- to 100-μm diameter wire. It was shown earlier that a hot spot (HS) with high plasma parameters also formed in the HXP, although its initial configuration is simpler than that of a standard X-pinch. Although details of the HXP dynamics still remain insufficiently studied, the main factors governing the HXP formation were investigated both experimentally and using magnetohydrodynamic simulations. The formation of a specific pressure profile in the electrode plasma after the wire explosion was investigated both experimentally and theoretically. It is shown that the effect of the pressure profile on the expanding wire plasma is similar for both standard X-pinches and HXPs, which allows one to assign them to the same class of loads of pulsed facilities. It is also established that the final stages of HS formation and the parameters of the HS plasma in standard X-pinches and HXPs are practically identical.
Authors:
; ;  [1] ;  [2] ; ; ;  [1] ; ; ; ;  [3] ;  [1]
  1. Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)
  2. Institute of Plasma Physics and Laser Microfusion (Poland)
  3. Cornell University (United States)
Publication Date:
OSTI Identifier:
22472501
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 41; Journal Issue: 1; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BYPASSES; ELECTRIC CURRENTS; ELECTRODES; HOT SPOTS; MAGNETOHYDRODYNAMICS; PINCH DEVICES; PINCH EFFECT; PLASMA; TUNGSTEN