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Weak and strong collisionless electrostatic shock wave (CESW) generated in the interaction between strong intense laser and near-critical-density plasma are studied by the one-dimensional particle-in-cell simulation in this work. And the effects of the ranges of plasma density profiles, non-relativistic and relativistic laser intensities on the generation of CESWs are also investigated. The non-relativistic weakly driven laser generates the weak CESW in the interaction between the laser and near-critical-density plasma. The electron spectra show double-temperature distribution because the non-relativistic driven laser cannot heat the electrons sufficiently. The low-temperature electrons have an important influence on the generation of weak CESW, and they can also cause the protons to be accelerated and reflected from the CESWs. The spectra of the weak CESW protons show a continuously distributed profile. When the range of plasma density up-ramp is large, the process can be observed that the post-soliton structure evolves into the ion acoustic wave and further into the weak collisionless electrostatic shock wave. When the driven laser intensity is relativistic, the electrons are heated sufficiently to a single relativistic temperature. The effect of the range of plasma density profile on the generation of CESW is further analyzed and it is found that 1) when the range of plasma density up-ramp is large, the potential barrier of ion acoustic wave is shielded by the hot electrons; 2) when the range of plasma density up-ramp is small, the effective distance (i.e. the Debye length) of accelerating field is larger and the endurance time is longer than when the range of plasma density up-ramp is large. This makes the ion acoustic wave structure more stable in its forward propagation process. When the difference in velocity between the ion acoustic wave accelerating protons and the target normal sheath accelerating protons satisfies the proton reflection condition of CESW, the ion acoustic wave further evolves into the strong CESW, the monoenergetic protons generated at the same time.
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Keywords:
- strong intense laser /
- collisionless electrostatic shock waves /
- electron temperature /
- ion acoustic wave
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图 1 初始激光等离子体条件设置, 驱动激光分为弱光强(a0 = 0.5)和强光强(a0 = 3.0)两种. 近临界密度分布分为10 μm和40 μm线性上升沿两种情况, 峰值密度均为1.5nc, 下降沿均为指数分布, 特征长度为8 μm
Figure 1. The setup of initial laser-plasma conditions, the drive intense lasers are divided as the weak intensity and the strong intensity corresponding to the normalized amplitude as a0 = 0.5 and a0 = 3.0. The density profiles are set up as 10 μm and 40 μm linear density up-ramp respectively. The peak densities both are 1.5nc. The density down-ramps both are exponentially distributed which the characteristic scale is 8 μm.
图 2 t = 150T0, t = 350T0, t = 500T0时刻, 弱驱动光强下, 质子密度np (a), (c) 和 纵向加速电场Ex (b), (d) 的分布 (a), (b) 第1种等离子体密度分布; (c), (d) 第2种等离子体密度分布, T0为对应波长1.0 μm的归一化激光周期
Figure 2. Distributions of (a), (c) the proton density np and (b), (d) the longitudinal electric field Ex with the weak drive laser intensity at t = 150T0, t = 350T0, t = 500T0: (a), (b) plasma density profile 1; (c), (d) plasma density profile 2, T0 is the normalized laser period which is corresponding to 1.0 μm wavelength.
图 4 t = 500T0时刻, 弱驱动光强下, 质子在相空间(x, px)中的分布 (a) 第1种等离子体密度分布; (b) 第2种等离子体密度分布; (c) 对应的动量px > 0的质子能谱分布
Figure 4. Protons distributions in phase-space (x, px) with the weak drive laser intensity at t = 500T0: (a) Plasma density profile 1; (b) plasma density profile 2; (c) the corresponding energy spectra for protons with proton momenta px > 0 at t = 500T0.
图 5 t = 500T0时刻, 弱驱动光强下, 电子能谱和拟合电子温度Te分布(低温TeL和高温TeH) (a) 第1种等离子体密度分布; (b) 第2种等离子体密度分布
Figure 5. Distributions of the electron energy spectrum and fitted electron temperature Te (low temperature TeL and high temperature TeH) with the weak drive laser intensity at t = 500T0: (a) Plasma density profile 1, (b) plasma density profile 2.
图 6 t = 100T0, t = 150T0, t = 200T0时刻, 强驱动光强下, 质子密度np (a), (c)和纵向加速电场Ex (b), (d)的分布 (a), (b) 第1种等离子体密度分布; (c), (d) 第2种等离子体密度分布.
Figure 6. Distributions of the proton density np(a), (c) and the longitudinal electric field Ex (b), (d) with the strong drive laser intensity at t = 100T0, t = 150T0, t = 200T0: (a), (b) Plasma density profile 1; (c), (d) plasma density profile 2.
图 7 t = 300T0, t = 350T0, t = 400T0时刻, 强驱动光强下, 质子密度np (a), (c)和纵向加速电场Ex (b), (d)的分布 (a), (b) 第1种等离子体密度分布; (c), (d) 第2种等离子体密度分布
Figure 7. Distributions of the proton density np(a), (c) and the longitudinal electric field Ex(b), (d) with the strong drive laser intensity at t = 300T0, t = 350T0, t = 400T0: (a), (b) Plasma density profile 1; (c), (d) plasma density profile 2.
图 8 t = 300T0, t = 350T0, t = 400T0时刻, 强驱动光强下, 质子在相空间(x, px)中的分布 (a) 第1种等离子体密度分布; (b) 第2种等离子体密度分布; (c) t = 400T0时刻, 对应的动量px > 0的质子能谱分布
Figure 8. Protons distributions in phase-space (x, px) with the strong drive laser intensity at t = 300T0, t = 350T0 and t = 400T0: (a) Plasma density profile 1; (b) plasma density profile 2; (c) the corresponding energy spectra for protons with proton momenta px > 0 at t = 400T0.
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[1] Moiseev S S, Sagdeev R Z 1963 J. Nucl. Energy, Part C Plasma Phys. 5 43
Google Scholar
[2] Taylor R J, Baker D R, Ikezi H 1970 Phys. Rev. Lett. 24 206
Google Scholar
[3] Ghavamian P, Schwartz S J, Mitchell J, Masters A, Laming J M 2013 Space Sci. Rev. 178 633
Google Scholar
[4] Waxman E 2006 Plasma Phys. Control. Fusion 48 B137
Google Scholar
[5] Nishikawa K -I, Hardee P, Richardson G, Preece R, Sol H, Fishman G J 2003 Astrophys. J. 595 555
Google Scholar
[6] Huang J, Weng S M, Wang X, Zhong J Y, Zhu X L, Li X F, Chen M, Masakatsu M, Sheng Z M 2022 Astrophys. J. 931 36
Google Scholar
[7] Drake R P 2000 Phys. Plasmas 7 4690
Google Scholar
[8] Courtois C, Grundy R A D, Ash A D, Chambers D M, Woolsey N C, Dendy R O, McClements K G 2004 Phys. Plasmas 11 3386
Google Scholar
[9] Romagnani L, Bulanov S V, Borghesi M, Audebert P, Gauthier J C, Löwenbrück K, Mackinnon A J, Patel P, Pretzler G, Toncian T, Willi O 2008 Phys. Rev. Lett. 101 025004
Google Scholar
[10] Denavit J 1992 Phys. Rev. Lett. 69 3052
Google Scholar
[11] Silva L O, Marti M, Davies J R, Fonseca R A, Ren C, Tsung F S, Mori W B 2004 Phys. Rev. Lett. 92 015002
Google Scholar
[12] Chen M, Sheng Z M, Dong Q L, He M Q, Li Y T, Bari M A, Zhang J 2007 Phys. Plasmas 14 053102
Google Scholar
[13] Liu M, Weng S M, Li Y T, Yuan D W, Chen M, Mulser P, Sheng Z M, Murakami M, Yu L L, Zheng X L, Zhang J 2016 Phys. Plasmas 23 113103
Google Scholar
[14] Fiuza F, Stockem A, Boella E, Fonseca R A, Silva L O, Haberberger D, Tochitsky S, Gong C, Mori W B, Joshi C 2012 Phys. Rev. Lett. 109 215001
Google Scholar
[15] Zhang W L, Qiao B, Huang T W, X. F. Shen, W. Y. You, X. Q. Yan, S. Z. Wu, Zhou C T, He X T 2016 Phys. Plasmas 23 073118
Google Scholar
[16] Zhang W L, Qiao B, Shen X F, You W Y, Huang T W, Yan X Q, Wu S Z, Zhou C T, He X T 2016 New J. Phys. 18 093029
Google Scholar
[17] Haberberger D, Tochitsky S, Fiuza F, Gong C, Fonseca R A, Silva L O, Mori W B, Joshi C 2012 Nat. Phys. 8 95
Google Scholar
[18] Zhang H, Shen B F, Wang W P, Zhai S H, Li S S, Lu X M, Li J F, Xu R J, Wang X L, Liang X Y, Leng Y X, Li R X, Xu Z Z 2017 Phys. Rev. Lett. 119 164801
Google Scholar
[19] Dover N P, Cook N, Tresca O, Ettlinger O, Maharjan C, Polyanskiy M N, Shkolnikov P, Pogorelsky I, Najmudin Z 2016 J. Plasma Phys. 82 415820101
Google Scholar
[20] Marquès J -R, Loiseau P, Bonvalet J, Tarisien M, d'Humières E, Domange J, Hannachi F, Lancia L, Larroche O, Nicolaï P, Puyuelo-Valdes P, Romagnani L, Santos J J, Tikhonchuk V 2021 Phys. Plasmas 28 023103
Google Scholar
[21] Puyuelo-Valdes P, Henares J L, Hannachi F, Ceccotti T, Domange J, Ehret M, d'Humieres E, Lancia L, Marquès J -R, Ribeyre X, Santos J J, Tikhonchuk V, Tarisien M 2019 Phys. Plasmas 26 123109
Google Scholar
[22] Helle M H, Gordon D F, Kaganovich D, Chen Y, Palastro J P, Ting A 2016 Phys. Rev. Lett. 117 165001
Google Scholar
[23] Deng Y, Zhang Q, Yue D, Wei W, Feng L, Cui Y, Ma Y, Lu F, Yang Y, Huang Z, Wu Y, Zhou W, Weng S, Liu F, Chen M, Yuan X, Zhang J 2022 Phys. Plasmas 29 123103
Google Scholar
[24] Deng Y Q, Yue D N, Luo M F, Zhao X, Li Y J, Ge X L, Liu F, Weng S M, Chen M, Yuan X H, Zhang J 2022 High Power Laser Sci. 10 e39
Google Scholar
[25] Naumova N M, Bulanov S V, Esirkepov T Zh, Farina D, Nishihara K, Pegoraro F, Ruhl H, Sakharov A S 2001 Phys. Rev. Lett. 87 185004
Google Scholar
[26] Borghesi M, Bulanov S, Campbell D H, Clarke R J, Esirkepov T Z, Galimberti M, Gizzi L A, MacKinnon A J, Naumova N M, Pegoraro F, Ruhl H, Schiavi A, Willi O 2002 Phys. Rev. Lett. 88 135002
Google Scholar
[27] Liu Y, Klimo O, Esirkepov T Z, Bulanov S V, Gu Y, Weber S, Korn G 2015 Phys. Plasmas 22 112302
Google Scholar
[28] Yue D N, Chen M, Zhao Y, Geng P F, Yuan X H, Dong Q L, Sheng Z M, Zhang J 2022 Chin. Phys. B 31 045205
Google Scholar
[29] Yue D N, Chen M, Geng P F, Yuan X H, Weng S M, Bulanov S S, Bulanov S V, Mima K, Sheng Z M, Zhang J 2021 Phys. Plasmas 28 042303
Google Scholar
[30] Yue D N, Chen M, Geng P F, Yuan X H, Sheng Z M, Zhang J, Dong Q L, Das A, Kumar G R 2021 Plasma Phys. Control. Fusion 63 075009
Google Scholar
[31] Yi L Q, Pusztai I, Pukhov A, Shen B F and Fülöp T 2019 J. Plasma Phys. 85 905850403
Google Scholar
[32] Yue D N, Chen M, Geng P F, Yuan X H, Dong Q L, Sheng Z M, Zhang J 2022 Plasma Phys. Control. Fusion 64 045025
Google Scholar
[33] Fonseca R A, Silva L O, Tsung F S, Decyk V K, Lu W, Ren C, Mori W B, Deng S, Lee S, Katsouleas T, Adam J C 2002 Lect. Notes Comput. Sci. 2331 342
[34] Yuan D W, Li Y T, Liu M, Zhong J Y, Zhu B J, Li Y F, Wei H G, Han B, Pei X X, Zhao J R, Li F, Zhang Z, Liang G Y, Wang F L, Weng S M, Li Y J, Jiang S E, Du K, Ding Y K, Zhu B Q, Zhu J Q, Zhao G, Zhang J 2017 Sci. Rep. 7 42915
Google Scholar
[35] Chenais-Popovics C, Renaudin P, Rancu O, Gilleron F, Gauthier J C, Larroche O, Peyrusse O, Dirksmöller M, Sondhauss P, Missalla T, Uschmann I, Förster E, Renner O, Krousky E 1997 Phys. Plasmas 4 190
Google Scholar
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