Non-equilibrium between ions and electrons inside hot spots from National Ignition Facility experiments

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• 作者：Zhengfeng Fan^a ; Yuanyuan Liu^a ; Bin Liu^a ; Chengxin Yu^a ; ^{cx_yu2013@163.com} ; Ke Lan^a ; Jie Liu^a ; ^b
• 关键词：Ion-electron non-equilibrium ; Hot-spot ignition conditions relaxation ; High-foot experiments
• 刊名：Matter and Radiation at Extremes
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：2
• 期：1
• 页码：3-8
• 全文大小：1014 K
• 卷排序：2

文摘

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 ion-electron non-equilibrium exists in high-foot implosions and the ion temperature could be ∼9% larger than the equilibrium temperature in some NIF shots.