Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.205001
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Funding
- U. S. DOE [DE-FG52-07NA28059, DE-FG52-06N826203]
- LLNL [B543881, LDRD-08ERD-062]
- LLE [414090-G]
- Fusion Science Center at University of Rochester [412761-G]
- General Atomics [DE-AC52-06NA27279]
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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 similar to 10(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 (similar to 10 mg cm(-3)) forms at the center of the hohlraum. This is a consequence of supersonic, radially directed Au jets (similar to 1000 mu m ns(-1), similar to Mach 4) that arise from the interaction of laser-driven plasma bubbles expanding into one another.
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