Monoenergetic-proton-radiography measurements of implosion dynamics in direct-drive inertial-confinement fusion |
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Authors: | Li C K Séguin F H Rygg J R Frenje J A Manuel M Petrasso R D Betti R Delettrez J Knauer J P Marshall F Meyerhofer D D Shvarts D Smalyuk V A Stoeckl C Landen O L Town R P J Back C A Kilkenny J D |
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Affiliation: | Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. |
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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 approximately 10(9) V/m), eventually reverses direction ( approximately 10(8) V/m), and is the probable consequence of the evolution of the electron pressure gradient. |
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