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Title: Design of laboratory experiments to study radiation-driven implosions

Journal Article · · High Energy Density Physics

The interstellar medium is heterogeneous with dense clouds amid an ambient medium. Radiation from young OB stars asymmetrically irradiate the dense clouds. Bertoldi (1989) developed analytic formulae to describe possible outcomes of these clouds when irradiated by hot, young stars. One of the critical parameters that determines the cloud’s fate is the number of photon mean free paths in the cloud. For the extreme cases where the cloud size is either much greater than or much less than one mean free path, the radiation transport should be well understood. However, as one transitions between these limits, the radiation transport is much more complex and is a challenge to solve with many of the current radiation transport models implemented in codes. In this paper, we present the design of laboratory experiments that use a thermal source of x-rays to asymmetrically irradiate a low-density plastic foam sphere. The experiment will vary the density and hence the number of mean free paths of the sphere to study the radiation transport in different regimes. Finally, we have developed dimensionless parameters to relate the laboratory experiment to the astrophysical system and we show that we can perform the experiment in the same transport regime.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002956; NA0002719; NA0001944
OSTI ID:
1454536
Alternate ID(s):
OSTI ID: 1419546
Journal Information:
High Energy Density Physics, Vol. 22; ISSN 1574-1818
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

References (11)

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Two-dimensional radiation-hydrodynamics calculations of the formation of O-B associations in dense molecular clouds journal November 1980
Radiation-driven implosions in molecular clouds journal September 1982
The photoevaporation of interstellar clouds. I - Radiation-driven implosion journal November 1989
Radiation-driven implosion of molecular cloud cores journal January 2003
Radiation-Driven Implosion and Triggered star Formation journal July 2011
The Effects of Irradiation on Cloud Evolution in Active Galactic Nuclei journal December 2013
HYADES—A plasma hydrodynamics code for dense plasma studies journal January 1994
HELIOS-CR – A 1-D radiation-magnetohydrodynamics code with inline atomic kinetics modeling journal May 2006
Crash: a Block-Adaptive-Mesh code for Radiative Shock Hydrodynamics—Implementation and Verification journal May 2011

Cited By (1)

Experimental considerations to observe two ionizing fronts in systems with a sharp absorption edge journal October 2018

Figures / Tables (6)


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