论文标题

混合驱动压力抑制内爆不稳定性,并为高增益惯性融合的不收敛率提供不散布的热点点火

Hybrid-drive pressure suppressing implosion instabilities and offering nonstagnation hotspot ignition with low convergence ratio for high-gain inertial fusion

论文作者

Li, Jiwei, He, XianTu, Wang, Lifeng, Chen, Yaohua, Xu, Yan, Li, Bin, He, Minqing, Cai, Hongbo, Hao, Liang, Liu, Zhanjun, Zheng, Chunyang, Dai, Zhensheng, Fan, Zhengfeng, Qiao, B., Yan, Ji, Li, Fuquan, Jian, Shaoen, Zhu, Shaoping

论文摘要

在激光驱动ICF中,混合驱动(HD)组合直接驱动(DD)和间接驱动器(ID)提供了平滑的HD压力$ P_ {HD} $,远高于ID和DD中的消融压力,以抑制流体动力学不稳定性。在这封信中,对新的鲁棒高清点火目标的模拟表明,最大高清压力高达$ p_ {hd} \ sim $ 650 $ 650由小说“推土机”效应驱动的MBAR,导致不散发的热点点火点在融合率$ c_r $ c_r $ c_r \ sim $ 23,fifter in fimity $ $ $ 10中,$ 2 $ \ \ \ fifter $ \ fiftion $ $ \ \ \ fifter $ \ sims。二维模拟已经证实了流体动力学不稳定性被抑制。最大高清压力$ p_ {hd} $(mbar)= $ be_ {dd}^{1/4} t_r $的合适尺度是从不同目标和激光能量的模拟中找到的,只要$ t_r> 160 $ ev,b是$> 160 $ ev,其中b是$ eblator IS $ e _ $ e _ las $ e _ las las las las las las las las las las las。 100 eV是辐射温度,具体取决于ID激光能量$ e_ {id} $。 $ p_ {hd} \ geq $ 450 mbar被要求进行热点点火。从$ e_ {dd} $减少到kj,“推土机”效果的此比例也可以使用。实验已验证了$ p_ {hd} $,使用$ e_ {id} = 43 $ kj($ t_r \ simeq $ 200 ev)和$ e_ {dd} $ = 3.6 kJ,大约3.5倍的辐射消融压力约3.5倍。 10^{15} {\ rm w \ cdot cm^{ - 2}} $是传统的DD激光 - plasma互动的三分之一

In laser-drive ICF, hybrid drive (HD) combined direct drive (DD) and indirect drive (ID) offers a smoothed HD pressure $P_{HD}$, far higher than the ablation pressure in ID and DD, to suppress hydrodynamic instabilities. In this letter, simulations of a new robust HD ignition target show that maximal HD pressure as high as $P_{HD} \sim$ 650 Mbar driven by a novel "bulldozer" effect is achieved, resulting in nonstagnation hotspot ignition at the convergence ratio $C_r \sim $23, and finally, fusion energy gain $\sim$ 10 in total laser energy = 1.42 MJ. Two-dimensional simulations have confirmed that hydrodynamic instabilities are suppressed. A well-fitted scale of maximal HD pressure $P_{HD}$ (Mbar)= $BE_{DD}^{1/4} T_r$ is found from simulations of different targets and laser energies as long as $T_r> 160$ eV, where B is the constant depending on ablator materials, $E_{DD}$ in kJ is DD laser energy and $T_r$ in 100 eV is radiation temperature depending on ID laser energy $E_{ID}$. $P_{HD}\geq$ 450 Mbar is requested for hotspot ignition. This scale from "bulldozer" effect is also available as $E_{DD}$ is reduced to kJ. Experiments have verified $P_{HD}$ about 3.5 times radiation ablation pressure for CH ablator using $E_{ID}=43$ kJ ($T_r \simeq$200 eV) and $E_{DD}$=3.6 kJ, also shown that both backscattering fraction and hot-electron energy fraction for DD laser intensity $\sim 1.8 \times 10^{15} {\rm w\cdot cm^{-2}}$ are about a third of the traditional DD laser-plasma interaction

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