Observations of Electromagnetic Fields and Plasma Flow in Hohlraums with Proton Radiography

Author(s)
Betti, R.; Back, C. A.; Frenje, Johan A.; Kilkenny, J. D.; Nikroo, A.; ... Show more
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Abstract
We report on the first proton radiography of laser-irradiated hohlraums. This experiment, with vacuum gold (Au) hohlraums, resulted in observations of self-generated magnetic fields with peak values ~10[superscript 6]  G. Time-gated radiographs of monoenergetic protons with discrete energies (15.0 and 3.3 MeV) reveal dynamic pictures of field structures and plasma flow. Near the end of the 1-ns laser drive, a stagnating Au plasma (~10  mg cm [superscript -3]) forms at the center of the hohlraum. This is a consequence of supersonic, radially directed Au jets (~1000  μm ns[superscript -1], ~Mach  4) that arise from the interaction of laser-driven plasma bubbles expanding into one another.
Date issued
2009-05
URI
http://hdl.handle.net/1721.1/51804
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Li, C. K. et al. “Observations of Electromagnetic Fields and Plasma Flow in Hohlraums with Proton Radiography.” Physical Review Letters 102.20 (2009): 205001. © 2009 The American Physical Society.
Version: Final published version
ISSN
0031-9007
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