针对神光Ⅱ升级装置的直接驱动快点火集成实验靶的初步设计

田超; 单连强; 周维民; 高喆; 谷渝秋; 张保汉

doi:10.7498/aps.63.125205

摘要

神光Ⅱ激光装置升级完成后，激光能量将大幅提高，同时配备皮秒拍瓦激光束，能够满足快点火研究在万焦耳级平台开展集成实验的需求. 神光Ⅱ升级装置设计原则是以间接驱动为主，兼顾直接驱动. 尽管直接驱动只是替代方案，然而由于直接驱动在快点火预压缩中具备一定优势，如能量利用率较高、对快点火导引锥预热较少、便于诊断等，因此需要探索基于神光Ⅱ升级装置的直接驱动快点火靶设计. 本文针对神光Ⅱ升级装置的激光条件，利用辐射流体程序Multi1D对集成实验用快点火直接驱动靶的尺寸进行了初步内爆压缩设计和优化. 在激光条件固定的情况下，优化无充气单层靶球的半径、厚度，尽可能实现高的密度、面密度. 得到最优靶参数为外半径420 μm，壳层厚度35 μm，与靶球定标关系验证一致. 根据超热电子定标关系，计算表明压缩过程实现的最高面密度与皮秒拍瓦激光产生的超热电子射程基本匹配.

关键词:

Abstract

The laser energy will be increased substantially when the Shenguang-II laser facility upgrade is completed and the petawatt picosecond laser beam will be equipped at the same time. For the fast ignition approach, direct-drive implosions have some advantages over indirect-drive ones, such as higher energy efficiency and lower mixing of cone material into fuel. Based on Shenguang-II upgraded laser facility, integrated direct-drive fast ignition experiments will be carried out and it will contribute to the further understanding of the relevant physics such as integrated coupling efficiency. The radiation hydrodynamic code Multi1D is used to design fast-ignition targets, and the optimized target parameters are achieved. The optimized target has a relatively thick wall (35 μm) and 420 μm-outer-radius CH shell, which are consistent with the scaling laws in target design. The deposition in the optimization target of the hot electrons generated by the picosecond petawatt pulse is also calculated according to the hot electrons scaling relation. The results show that the achieved areal density is high enough to stop the hot electrons.

Keywords:

作者及机构信息

1.
中国工程物理研究院激光聚变研究中心, 等离子体物理重点实验室, 绵阳 621900;

2.
清华大学工程物理系, 北京 100084

Authors and contacts

1.
Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China;

2.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China

参考文献

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[25]	Wu S Z, Zhou C T, Zhu S P, Zhang H, He X T 2011 Phys. Plasmas 18 022703
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施引文献

[1]	Tabak M, Hammer J, Glinsky M E, Kruer W L, Wilks S C, Woodworth J, Campbell E M, Perry M D, Mason R J 1994 Phys. Plasmas 1 1626
[2]	Kodama R, Norreys P A, Mima K, Dangor A E, Evans R G, Fujita H, Kitagawa Y, Krushelnick K, Miyakoshi T, Miyanaga N, Norimatsu T, Rose S J, Shozaki T, Shigemori K, Sunahara A, Tampo M, Tanaka K A, Toyama Y, Yamanaka T, Zepf M 2001 Nature 412 798
[3]	Roth M 2009 Plasma Phys. Control. Fusion 51 014004
[4]	Zhang J T, He B, He X T, Chang T Q, Xu L B, Andereev N E 2001 Acta Phys. Sin. 50 921 (in Chinese) [张家泰, 何斌, 贺贤土, 常铁强, 许林宝, 安德列夫 N E 2001 物理学报 50 921]
[5]	Theobald W, Anderson K S, Betti R, et al. 2009 Plasma Phys. Control. Fusion 51 124052
[6]	Theobald W, Solodov A A, Stoeckl C, et al. 2011 Phys. Plasmas 18 056305
[7]	Shiraga H, Fujioka S, Nakai M, et al. 2011 Plasma Phys. Control. Fusion 53 124029
[8]	Zhu J Q 2006 Chin. J. Nat. 5 271 (in Chinese) [朱健强 2006 自然杂志 5 271]
[9]	Cao Z R, Jiang S E, Chen J B, Miao W Y, Zhou W M, Chen M, Gu Y Q, Ding Y K 2007 Acta Phys. Sin. 56 5330 (in Chinese) [曹柱荣, 江少恩, 陈家斌, 缪文勇, 周维民, 陈铭, 谷渝秋, 丁永坤 2007 物理学报 56 5330]
[10]	Jia G, Xiong J, Dong J Q, Xie Z Y, Wu J 2012 Chin. Phys. B 21 095202
[11]	Dong J J, Cao Z R, Yang Z H, Chen B L, Huang T X, Deng B, Liu S Y, Jiang S E, Ding Y K, Yi S Z, Mu B Z 2012 Acta Phys. Sin. 61 155208 (in Chinese) [董建军, 曹柱荣, 杨正华, 陈伯伦, 黄天暄, 邓博, 刘慎业, 江少恩, 丁永坤, 伊圣振, 穆宝忠 2012 物理学报 61 155208]
[12]	Zhou C D, Theobald W, Betti R, Radha P B, Smalyuk V A, Shvarts D, Glebov V Y, Stoeckl C, Anderson K S, Meyerhofer D D, Sangster T C 2007 Phys. Rev. Lett. 98 025004
[13]	Zhou C D, Betti R 2007 Phys. Plasmas 14 072703
[14]	Zhou C D 2008 Ph. D. Dissertation (New York: University of Rochester)
[15]	Ramis R, Schmalz R, Meyer-Ter-Vehn J 1988 Comput. Phys. Commun. 49 475
[16]	Jiang S E, Miao W Y, Kuang L Y 2011 Acta Phys. Sin. 60 055206 (in Chinese) [江少恩, 缪文勇, 况龙钰 2011 物理学报 60 055206]
[17]	Zhang J, Chang T Q 2004 Fundaments of the Target Physics for Laser Fusion (Beijing: National Defence Industry Press) p38 (in Chinese) [张钧, 常铁强 2004 激光核聚变靶物理基础 (北京: 国防工业出版社) 第38页]
[18]	Beg F N, Bell A R, Dangor A E, Danson C N, Fews A P, Glinsky M E, Hammel B A, Lee P, Norreys P A, Tatarakis M 1997 Phys. Plasmas 4 447
[19]	Haines M, Wei M, Beg F, Stephens R 2009 Phys. Rev. Lett. 102 045008
[20]	Kluge T, Cowan T, Debus A, Schramm U, Zeil K, Bussmann M 2011 Phys. Rev. Lett. 107 205003
[21]	Deutsch C, Furukawa H, Mima K, Murakami M, Nishihara K 1996 Phys. Rev. Lett. 77 2483
[22]	Li C K, Petrasso R D 2004 Phys. Rev. E 70 067401
[23]	Solodov A A, Betti R 2008 Phys. Plasmas 15 042707
[24]	Atzeni S, Schiavi A, Davies J R 2009 Plasma Phys. Control. Fusion 51 015016
[25]	Wu S Z, Zhou C T, Zhu S P, Zhang H, He X T 2011 Phys. Plasmas 18 022703
[26]	Stoeckl C, Boehly T R, Delettrez J A, Hatchett S P, Frenje J A, Glebov V Y, Li C K, Miller J E, Petrasso R D, Séguin F H, Smalyuk V A, Stephens R B, Theobald W, Yaakobi B, Sangster T C 2005 Plasma Phys. Control. Fusion 47 B859

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