期刊
PHYSICAL REVIEW E
卷 104, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.104.L013201
关键词
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资金
- Department of Energy, National Nuclear Security Administration [DE-NA0003868, DE-NA0003938]
- agency of the United States Government
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- General Atomics [DE-NA0001808]
The experiments at the OMEGA laser facility showed that plasma shocks couple energy proportional to species mass in multi-ion plasmas. As equilibration time increases, deuterium and tritium ions have different energy distributions during shock convergence in ignition-relevant ICF implosions.
A series of thin glass-shell shock-driven DT gas-filled capsule implosions was conducted at the OMEGA laser facility. These experiments generate conditions relevant to the central plasma during the shock-convergence phase of ablatively driven inertial confinement fusion (ICF) implosions. The spectral temperatures inferred from the DTn and DDn spectra are most consistent with a two-ion-temperature plasma, where the initial apparent temperature ratio, T-T/T-D, is 1.5. This is an experimental confirmation of the long-standing conjecture that plasma shocks couple energy directly proportional to the species mass in multi-ion plasmas. The apparent temperature ratio trend with equilibration time matches expected thermal equilibration described by hydrodynamic theory. This indicates that deuterium and tritium ions have different energy distributions for the time period surrounding shock convergence in ignition-relevant ICF implosions.
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