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Title: Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment

Abstract

Measurements by multiple X-ray detectors show transient emission of a 1 ls pulse of non-monoenergetic 6 keV X-rays by a cold, dense MHD-driven plasma jet. Because the collision mean free path is much smaller than the jet dimensions, the acceleration of particles to high energy was not expected. The X-ray pulse occurs when the jet undergoes a kink instability which accelerates the jet laterally so that a fast-growing secondary Rayleigh-Taylor instability is triggered which then breaks the jet. The jet breaking is correlated in time with several other fast changing phenomena. It is proposed that despite the short collision mean free path, an inductive electric field associated with this breaking accelerates a certain subgroup of electrons to keV energies without any of these electrons undergoing collisions. It is further proposed that after being accelerated to high energy, these fast electrons are suddenly decelerated via collisions and radiate X-rays.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
Publication Date:
Research Org.:
California Institute of Technology
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1491998
DOE Contract Number:  
FG02-04ER54755
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 11; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English

Citation Formats

Marshall, R. S., Flynn, M. J., and Bellan, P. M. Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment. United States: N. p., 2018. Web. doi:10.1063/1.5054927.
Marshall, R. S., Flynn, M. J., & Bellan, P. M. Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment. United States. doi:10.1063/1.5054927.
Marshall, R. S., Flynn, M. J., and Bellan, P. M. Thu . "Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment". United States. doi:10.1063/1.5054927.
@article{osti_1491998,
title = {Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment},
author = {Marshall, R. S. and Flynn, M. J. and Bellan, P. M.},
abstractNote = {Measurements by multiple X-ray detectors show transient emission of a 1 ls pulse of non-monoenergetic 6 keV X-rays by a cold, dense MHD-driven plasma jet. Because the collision mean free path is much smaller than the jet dimensions, the acceleration of particles to high energy was not expected. The X-ray pulse occurs when the jet undergoes a kink instability which accelerates the jet laterally so that a fast-growing secondary Rayleigh-Taylor instability is triggered which then breaks the jet. The jet breaking is correlated in time with several other fast changing phenomena. It is proposed that despite the short collision mean free path, an inductive electric field associated with this breaking accelerates a certain subgroup of electrons to keV energies without any of these electrons undergoing collisions. It is further proposed that after being accelerated to high energy, these fast electrons are suddenly decelerated via collisions and radiate X-rays.},
doi = {10.1063/1.5054927},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 25,
place = {United States},
year = {2018},
month = {11}
}