Monoenergetic-proton-radiography measurements of implosion dynamics in direct-drive inertial-confinement fusion

C. K. Li, F. H. Séguin, J. R. Rygg, J. A. Frenje, M. Manuel, R. D. Petrasso, R. Betti, J. Delettrez, J. P. Knauer, F. Marshall, D. D. Meyerhofer, D. Shvarts, V. A. Smalyuk, C. Stoeckl, O. L. Landen, R. P.J. Town, C. A. Back, J. D. Kilkenny

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98 Scopus citations

Abstract

Time-gated, monoenergetic radiography with 15-MeV protons provides unique measurements of implosion dynamics in direct-drive inertial-confinement fusion. Images obtained during acceleration, coasting, deceleration, and stagnation display a comprehensive picture of spherical implosions. Critical information inferred from such images, hitherto unavailable, characterizes the spatial structure and temporal evolution of self-generated fields and plasma areal density. Results include the first observation of a radial electric field inside the imploding capsule. It is initially directed inward (at ∼109V/m), eventually reverses direction (∼108V/m), and is the probable consequence of the evolution of the electron pressure gradient.

Original languageEnglish
Article number225001
JournalPhysical Review Letters
Volume100
Issue number22
DOIs
StatePublished - 2 Jun 2008

ASJC Scopus subject areas

  • Physics and Astronomy (all)

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