Matter and Radiation at Extremes, 2017, 2 (1): 3, Published Online: Jan. 17, 2018
Non-equilibrium between ions and electrons inside hot spots from National Ignition Facility experiments
Ion-electron non-equilibrium Ion-electron non-equilibrium Hot-spot ignition conditions relaxation Hot-spot ignition conditions relaxation High-foot experiments High-foot experiments
Abstract
The non-equilibrium between ions and electrons in the hot spot can relax the ignition conditions in inertial confinement fusion [Fan et al., Phys. Plasmas 23, 010703 (2016)], and obvious ion-electron non-equilibrium could be observed by our simulations of high-foot implosions when the ion-electron relaxation is enlarged by a factor of 2. On the other hand, in many shots of high-foot implosions on the National Ignition Facility, the observed X-ray enhancement factors due to ablator mixing into the hot spot are less than unity assuming electrons and ions have the same temperature [Meezan et al., Phys. Plasmas 22, 062703 (2015)], which is not self-consistent because it can lead to negative ablator mixing into the hot spot. Actually, this non-consistency implies ion-electron non-equilibrium within the hot spot. From our study, we can infer that ionelectron non-equilibrium exists in high-foot implosions and the ion temperature could be ~9% larger than the equilibrium temperature in some NIF shots.
Zhengfeng Fan, Yuanyuan Liu, Bin Liu, Chengxin Yu, Ke Lan, Jie Liu. Non-equilibrium between ions and electrons inside hot spots from National Ignition Facility experiments[J]. Matter and Radiation at Extremes, 2017, 2(1): 3.