Role of hot-electron preheating in the compression of direct-drive imploding targets with cryogenic D2 ablators

V. A. Smalyuk, D. Shvarts, R. Betti, J. A. Delettrez, D. H. Edgell, V. Yu Glebov, V. N. Goncharov, R. L. McCrory, D. D. Meyerhofer, P. B. Radha, S. P. Regan, T. C. Sangster, W. Seka, S. Skupsky, C. Stoeckl, B. Yaakobi, J. A. Frenje, C. K. Li, R. D. Petrasso, F. H. Séguin

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

The compression of direct-drive, spherical implosions is studied using cryogenic D2 targets on the 60-beam, 351-nm OMEGA laser with intensities ranging from ∼3×1014 to ∼1×1015W/cm2. The hard-x-ray signal from hot electrons generated by laser-plasma instabilities increases with laser intensity, while the areal density decreases. Mitigating hot-electron production, by reducing the laser intensity to ∼3×1014W/cm2, results in areal density of the order of ∼140mg/cm2, in good agreement with 1D simulations. These results will be considered in future direct-drive-ignition designs.

Original languageEnglish
Article number185005
JournalPhysical Review Letters
Volume100
Issue number18
DOIs
StatePublished - 8 May 2008
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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