Implosion Experiments using Glass Ablators for Direct-Drive Inertial Confinement Fusion
Author(s)
Smalyuk, V. A.; Betti, R.; Delettrez, J. A.; Glebov, V. Yu.; Meyerhofer, D. D.; Radha, P. B.; Regan, S. P.; Sangster, T. C.; Sanz, J.; Seka, W.; Stoecki, C.; Yaakobi, B.; Frenje, Johan A.; Li, Chikang; Petrasso, Richard D.; Seguin, Fredrick Hampton; ... Show more Show less
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Direct-drive implosions with 20-μm-thick glass shells were conducted on the Omega Laser Facility to test the performance of high-Z glass ablators for direct-drive, inertial confinement fusion. The x-ray signal caused by hot electrons generated by two-plasmon-decay instability was reduced by more than ~40× and hot-electron temperature by ~2× in the glass compared to plastic ablators at ignition-relevant drive intensities of ~1×10[superscript 15] W/cm[superscript 2], suggesting reduced target preheat. The measured absorption and compression were close to 1D predictions. The measured soft x-ray production in the spectral range of ~2 to 4 keV was ~2× to 3× lower than 1D predictions, indicating that the shell preheat caused by soft x-rays is less than predicted. A direct-drive-ignition design based on glass ablators is introduced.
Date issued
2010-04Department
Massachusetts Institute of Technology. Plasma Science and Fusion CenterJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Smalyuk, V.A. et al. "Implosion Experiments using Glass Ablators for Direct-Drive Inertial Confinement Fusion." Physical Review Letters 104.16 (2010): 165002. © 2010 The American Physical Society
Version: Final published version
ISSN
0031-9007