The role of fast-electron preheating in low-adiabat cryogenic implosions on OMEGA

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

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


The compression in direct-drive, low-adiabat spherical implosions was studied using cryogenic D2 targets on the 60-beam, 351-nm OMEGA laser in the range of laser intensities from ∼3 × 1014 to ∼1.5 × 1015 W/cm2. The neutron-burn - averaged areal densities decreased as the laser intensity increased. This decrease in areal density is highly correlated with the increased hard-x-ray signals, caused by hot electrons generated by the two-plasmon-decay instability. The areal-density reduction up to ∼2, observed in the experiments, requires a preheat energy of ∼60 J (∼0.3% of total laser energy), which is consistent with the estimated preheat levels inferred from the hard-x-ray signal levels. Mitigating the generation of fast-electrons results in high areal densities which are close to the 1D predictions.

Original languageEnglish
Article number022005
JournalJournal of Physics: Conference Series
Issue numberPart 2
StatePublished - 12 Jun 2008
Externally publishedYes
Event5th International Conference on Inertial Fusion Sciences and Applications, IFSA 2007 - Kobe, Japan
Duration: 9 Sep 200714 Sep 2007

ASJC Scopus subject areas

  • General Physics and Astronomy


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