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
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