Hot-electron deposition and implosion mechanisms within electron shock ignition

doi:10.1088/1674-1056/aba9c3

Abstract

A hot-electron driven scheme can be more effective than a laser-driven scheme within suitable hot-electron energy and target density. In our one-dimensional (1D) radiation hydrodynamic simulations, 20× pressure enhancement was achieved when the ignitor laser spike was replaced with a 60-keV hot-electron spike in a shock ignition target designed for the National Ignition Facility (NIF), which can lead to greater shell velocity. Higher hot-spot pressure at the deceleration phase was obtained owing to the greater shell velocity. More cold shell material is ablated into the hot spot, and it benefits the increases of the hot-spot pressure. Higher gain and a wider ignition window can be observed in the hot-electron-driven shock ignition.

Keywords: shock ignition inertial confinement fusion hot electron plasma fusion

Received: 01 June 2020
Revised: 12 July 2020
Accepted manuscript online: 28 July 2020

PACS:	52.58.-c	(Other confinement methods)
	52.57.-z	(Laser inertial confinement)
	81.15.Jj	(Ion and electron beam-assisted deposition; ion plating)
	89.30.Jj	(Nuclear fusion power)

Corresponding Authors: ^†Corresponding author. E-mail: wanlishang@gmail.com

About author:

†Corresponding author. E-mail: wanlishang@gmail.com

* Project supported by the National Natural Science Foundation of China (Grant No. 11775203) and the Presidential Foundation of China Academy of Engineering Physics (Grant No. YZJJLX 2016007).

Cite this article:

Wan-Li Shang(尚万里)†, Xing-Sen Che(车兴森), Ao Sun(孙奥), Hua-Bing Du(杜华冰), Guo-Hong Yang(杨国洪), Min-Xi Wei(韦敏习), Li-Fei Hou(侯立飞), Yi-Meng Yang(杨轶濛), Wen-Hai Zhang(张文海), Shao-Yong Tu(涂绍勇), Feng Wang(王峰), Hai-En He(何海恩), Jia-Min Yang(杨家敏), Shao-En Jiang(江少恩), and Bao-Han Zhang(张保汉) Hot-electron deposition and implosion mechanisms within electron shock ignition 2020 Chin. Phys. B 29 105201

Fig. 1.

The normalized Maxwellian distribution of hot-electron temperature of 40 keV, 60 keV, and 100 keV.

Fig. 2.

The energy depositions (solid lines) for the monoenergetic hot electrons with energies of 40 keV, 60 keV, and 100 keV. The density profile is shown as the dashed line.

Fig. 3.

The spatial moments (solid lines) of the electron-distribution function for the monoenergetic hot electrons with energies of 40 keV, 60 keV, and 100 keV. The density profile is shown as the dashed line.

Fig. 4.

The energy deposition (blue line) and the locally deposited flux (red line) of the 100-keV monoenergetic hot electron in DT plasma.

Fig. 5.

The gains versus the ignitor shock launching times. The black line represents LILAC calculations with the laser-driven shock ignition, and the colored lines are 1D simulations with the hot-electron-driven shock ignition with different hot-electron energies.

Fig. 6.

The density and pressure profiles after the ignitor shock launched for 0, 100, and 200 ps. Panels (a)–(c) for the laser spike driven, and panels (d)–(f) for the hot-electron spike driven. The highest gain targets in Fig. 5 are utilized. For the laser-driven shock ignition, the ignitor shock launching time is 9.6 ns, and for the hot-electron-driven shock ignition, the ignitor shock launching time is 10.3 ns.

Fig. 7.

The trajectory and implosity velocity for (a) the laser-driven shock ignition and (b) the hot-electron-driven shock ignition.

Fig. 8.

The target density profile (a), pressure profile (b), temperature profile (c), and adiabat profile (d) at stagnation without burn wave for the laser- and hot-electron-driven shock ignitions.

Fig. 9.

(a) The neutron rate, (b) target density profile, (c) pressure profile, (d) and ion temperature profile at peak neutron rate with burn wave for the laser- and hot-electron-driven shock ignitions.

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