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The 1st Announcement of 15th International West Lake Symposium - Frontiers in Laser Plasma Physics
2025-03-27
聚变理论与模拟中心
The 15th International West Lake Symposium — Frontiers in Laser Plasma Physics1st announcement of this conferenceThe 15th International West Lake Symposium - Frontiers in Laser Plasma Physics (IWLS-2025) will be held in Hangzhou, China, June 6 - 9, 2025. IWLS-2025 will be hosted by the Institute for Fusion Theory and Simulation (IFTS), Zhejiang University (ZJU). The IWLS Symposium series was launched in 2006 when IFTS was established in Zhejiang University. It covers a broad scope on plasma sciences; including laser fusion physics, magnetic fusion physics, space plasma physics, laser plasma physics and high-energy-density physics. IWLS-2025 will cover the following topics: inertial confinement fusion, laser plasma interaction, laser particle accelerator, novel radiation sources, strong-field QED, and other laser-plasma related studies. In addition, there will be a Special Memorial Session in honor of the late Professor Kunioki Mima; a close colleague and friend of IFTS. Scientists and graduate students from around the world are welcome to present theory, simulation and experimental results related to these topics.Conference Form: Invited talks, oral talks, and posters.Conference Language: EnglishSponsor: Institute for Fusion Theory and Simulation, Zhejiang UniversityProgram Committee (preliminary)Xian-Tu He (PKU/IAPCM/ZJU), Liu Chen (ZJU), Zheng-Ming Sheng (SJTU), Bai-Fei Shen (SNU), Bin Qiao (PKU), Zheng-Mao Sheng (ZJU), Xing-Long Zhu (ZJU)Local Organization Committee:Xing-Long Zhu (IFTS/ZJU), Zheng-Mao Sheng (IFTS/ZJU), Hui-Chun Wu (IFTS/ZJU)Tentative schedule:June 6, 2025 (Friday): RegistrationJune 7 - 9, 2025: Formal MeetingPre-registration:Please submit the attached form by email or online registration (https://jsj.top/f/BXyZSH)Submission Deadline: May 12th, 2025Visa Information:China requires visa for foreign visitors. A formal invitation letter from us will be needed for the visa application. You can also come as a tourist, in this case please contact the local Chinese Consulate for the visa requirements. If you need any help, please feel free to contact us.Contact: Ms. Wanzheng Dong (Secretary)Email: ifts@zju.edu.cnTel: +86 18827750824Registration Fees (On-site Payment: credit card, Alipay,WeChat Pay or cash)Domestic ParticipantsInternational Participants RegularCNY￥2500US$350StudentCNY￥1800US$250Attachment:15th International West Lake Symposium — Frontiers in Laser Plasma PhysicsSign up Form Name: Affiliation:Gender:Title /Position: Regular/student:Address:Nationality:Email:Tel: Title of talk or poster:Regular Session or Mima Memorial Session:Abstract (limited to 1 page)
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第四届中意韩高能量粒子物理三方研讨会顺利召开
2024-11-07
聚变理论与模拟中心
2024年10月26日至27日，由浙江大学物理学院聚变理论与模拟中心主办的“第四届中意韩高能量粒子物理三方研讨会”（4th Trilateral International Workshop on Energetic Particle Physics）在杭州六通宾馆顺利召开。来自意大利国家新技术、能源和可持续经济发展局、都灵大学，韩国聚变能研究所，汉阳大学以及国内主要科研院校的约50名专家和学者参加了会议。会议的目的是研讨磁约束聚变等离子体中高能量粒子物理的最新进展和将来合作研究方向。聚变理论与模拟中心主任傅国勇教授担任本次会议主席。在2天会期中，共有19个邀请报告和18张海报，主题包括磁约束聚变等离子体中的高能量粒子物理，湍流输运和磁流体不稳定性等方面。研讨会上，学者们就高能量粒子不稳定性和输运，高能量粒子与背景等离子体的相互作用以及相关模拟程序开发等方面的最新进展进行了热烈讨论，并探讨了今后可能的合作方向。本次会议是中意韩学者聚焦磁约束聚变等离子体前沿研究和国际合作的一次重要研讨会，会议对促进浙江大学以及国内聚变等离子体前沿研究的发展与国际交流具有重要意义。
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巨脉冲和快射电暴的圆偏振机制
2024-10-14
聚变理论与模拟中心
巨脉冲和快射电暴的圆偏振机制北宋时期的司天监于1054年记录了一次超新星爆发，这一事件形成了一颗半径约10公里的中子星和包裹它的蟹状星云。巧合的是，该中子星的磁轴恰好对准了6500光年外的地球。通过高速自转，中子星沿着磁轴发出的电磁辐射每秒扫过地球30次。1968年，科学家首次探测到来自这颗中子星的巨脉冲（giant pulse）无线电波。2003年，Hankins的观测结果显示这些巨脉冲由众多仅1纳秒宽的子脉冲堆积而成，并且这些子脉冲具有极高的圆偏振度。左图：蟹状星云；右图：中子星辐射示意图2007年，Lorimer首次报道了快射电暴（fast radio burst），可以说快射电暴是近年来天文领域最重要的意外发现。2020年，人们观测到银河系内一颗磁星（磁场更强的中子星）爆发了快射电暴。与巨脉冲相似，部分快射电暴也展现出高度的圆偏振。然而，巨脉冲和快射电暴的圆偏振机制至今尚不明确。等间隔双线分布的巨脉冲信号本研究首次在蟹状星云中子星的一个巨脉冲中发现了等间隔成对分布的子脉冲。每对脉冲中，第一个为左旋圆偏振，第二个为右旋圆偏振。上图展示了9对子脉冲的配对情况，成对子脉冲的时间间隔均在21微秒左右，不确定度仅为0.8微秒。理论上，法拉第效应可以用于解释这一现象。然而，中子星磁层内的等离子体由电子和正电子组成，沿磁场方向观测，它们的回旋运动对左右圆偏振是对称的，因此法拉第效应不起作用。我们大胆假设中子星磁层内的正负电子等离子体存在高度不对称性，即正负电荷没有完全中和，或正负电子能量存在显著差异。在这种不对称等离子体中，法拉第效应会将一个线偏振波分裂成前后延迟的左右圆偏振模式。在磁层参数允许的范围内，只有考虑巨脉冲的相对论强场效应，我们才能计算出符合观测结果的一对圆偏振射电脉冲。该理论还成功解释了巨脉冲的反常色散和随机偏振角等特异现象。此外，已有观测表明某些快射电暴也包含纳秒量级的子脉冲，其圆偏振可以用类似的机制进行解释。鉴于广泛认为中子星磁场方向上存在电场，这些电场可以加速正负电子，并可能诱发所假设的等离子体不对称性。此外，部分磁层粒子模拟结果也显示出不对称等离子体的迹象。关于巨脉冲和快射电暴的产生机制，学术界尚无定论，根本原因在于我们对中子星磁层的认识不足。通过观察中子星的电磁辐射，难以推断出更多有用的磁层信息。本研究发现的纳秒级成对巨脉冲可作为一种诊断磁层的新工具，有望帮助确定中子星磁层的等离子体参数。该研究由浙江大学物理学院武慧春教授完成，近日发表在《Astrophysical Journal Letters》。论文链接：https://doi.org/10.3847/2041-8213/ad8154
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电子束驱动强场QED效应及其产生的稠密极化正电子源
2024-06-11
聚变理论与模拟中心
导读近日，我中心朱兴龙研究员与上海交大盛政明教授、人民大学王伟民教授等人合作在《Physical Review Letters》上发表题为“Dense polarized positrons from beam-solid interaction”的研究成果。该研究报道了强场量子电动力学（QED）研究方面的最新进展，在国际上首次发现了通过电子束直接驱动固体靶高效激发多光子Breit-Wheeler（BW）过程以及由此产生稠密极化正电子束的物理现象，揭示了QED场强下束靶相互作用新机制，为高能极化正电子源的发展及应用研究奠定了基础。研究背景高能正电子产生不仅是强场QED物理中最重要的过程之一，而且在诸多研究领域中起着至关重要的作用。特别是，当高能正电子束携带高自旋极化度时，其可以应用于探索一些基本的物理问题，例如寻找超标准模型新物理、探测核子结构以及理解一些极端的天体物理现象等。尽管高密度高能量的极化正电子可能广泛地存在于一些高能天体物理环境中，但是它们很难在实验室中获得。研究亮点研究团队在国际上首次发现了相对论非极化电子束与固体结构靶相互作用产生稠密极化GeV正电子的全新物理方案。电子束首先经过一个小角度的空心锥型靶（充当聚焦器）诱导强烈的磁聚焦，使其密度提高约两个数量级；电子束被聚焦到近固体密度范畴，这对触发强场QED过程是至关重要的，如此高密度电子束是当代加速器或其他技术方法所不能直接实现的。随后，聚焦的高密度电子束直接入射到一个固体靶表面（充当转换器）激发多光子BW过程产生稠密正电子，如图1所示。当高密度电子束撞击到固体靶表面时，其将引起超强的等离子体电子回流，从而在靶表面产生非对称强磁场。在此强磁场中电子束将发生进一步聚焦作用，同时将靶内的磁场强度进一步放大到兆特斯拉以上。相对论电子在此高强度准静态磁场作用下可以有效触发多光子BW过程，产生大量高能稠密正电子。另一方面，该磁场在等离子体内与真空中是不对称的，产生的正电子主要位于靶内侧，其经历着单极强磁场，通过辐射自旋翻转效应获得高极化度。此外，由于洛伦兹力的作用，在靶内产生的正电子将沿着-y方向偏离，而在靶外产生的正电子将沿着+y方向偏离。最终，产生两团自旋方向相反的高极化稠密GeV正电子束。计算结果表明，获得的正电子能量转化效率可达108/J，驱动电子与正电子的产率比达到0.3e+/e-，这是目前其他方法所难以达到的。这得益于驱动束激发强作用场的同时，其自身始终处于最强场区域，直至能量耗尽为止，是一种自持的高效作用机制。与之相比，在高强度激光作用构型中，往往取决于激光脉宽（即约为10fs尺度），产生的极化正电子能量转化效率一般不超过104/J。因此，该研究是目前产生稠密极化正电子最高效的方法。图1. (a)物理方案原理图，包括电子束聚焦和正电子产生。(b)稠密极化正电子产生机制图。总结与展望该工作首次报道了一种高效、简洁的方法，在不采用高强度激光的情况下，通过高能电子束驱动固体靶直接激发多光子BW过程并产生高极化稠密正电子束，揭示了QED场强下新的束靶作用机制。获得的正电子束电量可达纳库级、平均极化度高达40%以上。电子束在靶表面诱导的准静态强磁场具有天然不对称性，由此引起的正电子自旋极化机制是稳健的。研究表明进一步增加驱动束电量或能量，可以产生更多的极化正电子。该研究为高能极化正电子源的产生和应用研究提供了新途径。浙江大学物理学院朱兴龙研究员为该论文的第一作者兼通讯作者，上海交通大学盛政明教授和中国人民大学王伟民教授为共同通讯作者，合作者包括陈民教授、余同普教授、翁苏明教授和刘维媛博士。该工作得到了国家自然科学基金、浙江大学百人计划等项目的资助。论文链接：https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.235001欢迎感兴趣的同学前来交流或加入朱老师课题组开展相关研究，详情见：https://person.zju.edu.cn/xlzhu
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大尺度动理学模拟揭示对撞等离子体电磁湍流非线性演化与离子随机加热机制
2024-05-15
聚变理论与模拟中心
大尺度动理学模拟揭示对撞等离子体电磁湍流非线性演化与离子随机加热机制在天体物理中，常会出现高速等离子体的对撞，如超新星爆发的喷射物和太阳风与星际介质之间的相互作用。此类过程中等离子体速度和温度存在各项异性，宇宙中的种子磁场会在韦伯型不稳定性（Weibel-type instabilities）等作用下被放大成为电磁湍流并产生冲激波，继而产生极强的自生磁场。因此强磁场产生、无碰撞冲激波及其驱动的带电粒子加速等科学问题的研究是当前实验室天体物理领域的关注焦点，而且利用高功率激光装置（如美国的NIF，OMEGA以及中国的神光）已经成功产生了类似于天体中的对撞等离子体环境。浙江大学聚变理论与模拟中心团队，联合上海交通大学和中国科学院国家天文台相关团队，利用吴栋副教授开发的动理学模拟程序LAPINS，定量研究了磁化和非磁化碳氘与碳氢对撞等离子体系统中电磁湍流的非线性演化及其对离子动理学等过程的影响。研究表明：1）在成丝不稳定性和双流不稳定性的协同驱动下会产生电磁湍流；2）在外加横向磁场（垂直于对撞方向）作用下，等离子体自组织效应导致湍流场的剧烈放大，可以产生数十倍于外加磁场的自生磁场；3）离子在湍流场随机加速和碰撞热化的共同作用下，其分布函数会呈现超高斯分布，其中的高能离子会使得系统中氘氘聚变反应产额增加5～6倍。研究结果很好地解释了已有的实验结果。该成果以“Ion Kinetics and Neutron Generation Associated with Electromagnetic Turbulence in Laboratory-Scale Counterstreaming Plasmas” 为题于2024年4月11日发表在Physical Review Letters期刊。浙江大学物理学院博士生刘鹏为该文的第一作者，上海交通大学吴栋副教授、浙江大学聚变理论与模拟中心盛正卯教授为共同通讯作者。 文章信息P. Liu, D. Wu*， T. X. Hu , D. W. Yuan, G. Zhao, Z. M. Sheng*，X. T. He, and J. Zhang，Ion Kinetics and Neutron Generation Associated with Electromagnetic Turbulence in Laboratory-Scale Counterstreaming Plasmas，Phys. Rev. Lett. 132, 155103 (2024), PhysRevLett.132.155103 (aps.org)在激光驱动对流等离子体系统中（a），大尺度动理学模拟得到的非磁化（b）和磁化（c）对流等离子体中自生湍流磁场的空间分布。Ion Kinetics and Neutron Generation Associated with Electromagnetic Turbulence in Laboratory-Scale Counterstreaming Plasmas.pdf
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11th International Conference on Computational Physics
2019-06-21
聚变理论与模拟中心英文网
2019年6月24日-28日，第十一届计算物理国际会议（11th International Conference on Computational Physics）将在浙江大学紫金港校区举行。会议日程请见附件。6月24日-28日每天早晚都有班车，时间如下：TimeDeparture placeArrival place07:40 amEntrance of Yuquan Campus, Zhejiang University（浙江大学玉泉校区）Bld.MengMinWei, Zijingang Campus, Zhejiang University（浙江大学紫金港校区蒙民伟楼）19:00 pm Hangzhou Zijingang Internatioal Hotel(杭州紫金港国际饭店）Entrance of Yuquan Campus, Zhejiang Univeristy（浙江大学玉泉校区正门）希望各位老师、同学积极参加！ICCP11-会议日程安排.doc
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13th International West Lake Symposium – Extreme Radiation Physics
2019-04-22
聚变理论与模拟中心英文网
13th International West Lake Symposium – Extreme Radiation PhysicsHangzhou, China May 4-6, 2019 The 13th International West Lake Symposium – Extreme Radiation Physics (IWLS-ERP19) will be held in Hangzhou, China, May 4-6, 2019. IWLS-ERP19 will be hosted by the Institute for Fusion Theory and Simulation (IFTS), Zhejiang University. The mission of IFTS is to carry out cutting-edge research in plasma physics. Laser power is reaching 10 PW thanks to CPA. Intense lasers have led to many new research areas and applications, including novel schemes for laser-driven particle acceleration, fusion ignition, generation of extreme radiation in the X- and γ-ray, THz and microwave regimes, as well as laboratory modeling of astrophysical radiation sources. IWLS-ERP19 will mainly be on extreme-radiation generation and related, including cross-disciplinary, topics. Presentations of theoretical, computational, and experimental results from scientists and graduate students worldwide are welcome.Topics• Intense laser technology• Laser-plasma interaction• Laser particle accelerator• Extreme radiation sources (x/ ray, THz, microwave etc.)• Extreme radiation-matter interactionConference FormatInvited talks, oral talks, and posters.Program Committee (preliminary)Xian-Tu He (PKU/IAPCM/ZJU), Ru-Xin Li (SIOM/CAS), Yu-Tong Li (IOP/CAS), Zheng-Ming Sheng (SJTU/US), Zhi-Yi Wei (IOP/CAS), Yu-Xin Leng(SIOM/CAS)，Hui-Chun Wu (IFTS/ZJU),Ming-Yang Yu (SZTU/ZJU)Organizing CommitteeHui-Chun Wu (IFTS/ZJU), Zheng-Mao Sheng (IFTS/ZJU), Dong Wu (IFTS/ZJU)Visa InformationChina requires visa for foreign visitors. A formal invitation letter from us will be needed for the visa application. You can also come as a tourist, in this case please contact the local Chinese Consulate for the visa requirements. If you need any help, please feel free to contact us.Contact PersonMs. Li (Secretary)Email: ifts@zju.edu.cnTel/Fax: +86-571-8795-3967
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The 11th International Conference on Computational Physics November 19-23, 2018, Hangzhou, China
2018-07-25
聚变理论与模拟中心英文网
The 11th International Conference on Computational Physics November 19-23, 2018, Hangzhou, China The 11th International Conference on Computational Physics (ICCP11) will be held at Hangzhou, China from 19-23 November, 2018. The 11th International Conference on Computational Physics aims to bring together leading academic scientists, researchers and scholars to exchange and share their experiences and research results about all aspects of Computational Physics, and discuss the practical challenges encountered and the solutions adopted.Topics:The meeting will focus on key aspects of computational physics. Topics to be covered include, but are not limited to, the following:Condensed matter and material physicsOptical and Plasma PhysicsAstrophysics, Nuclear and Particle PhysicsFluid Dynamics, Multiphase and complex fluidsNon-linear and Complex SystemsBiological systemsEnergy and environmentNumerical methods for PDEsFast algorithmsUncertainty quantification and rare eventsMultiscale modeling & simulationDensity functional theory and beyondParallel and cloud computingVisualization Big Data and Data MiningEducation (If we can find a person to organize a mini-symposium)Deadlines：Abstract submission：20 September,2018International Advisory Committee：• Chi-Wang Shu, Brown University, USA• Choy Heng Lai, National University of Singapore, Singapore• Da Hsuan Feng, China Silk Road iValley Research Institute• Guoyong Fu, Zhejiang University• Hui PAN, University of Macau• Jisoon Ihm, POSTECH，Korea• Lev Shchur, Laudau Institute for Theoretical Physics, Russia• Remi Abgrall, University of Zurich, Switzerland• Shi Jin, University of Wisconsin, USA• Shi-Yi Chen, Southern University of Science and Technology of China• Steven G. Louie, University of California at Berkeley, USA• Tao Tang, Southern University of Science and Technology of China• Vijay Kumar, Foundation, India• Weiyan Zhang, China Academy of Engineering Physics, China• Xiantu He, IAPCM• Yuanping Feng, National University of Singapore, SingaporeLocal Organizing Committee:• Zheng-Mao Sheng (Chair) Kai Wang (Co-Chair)• Bo Zheng Zhiwei Ma• Huichun Wu Qinhuo Chen• Jingyuan Li Jianlan Wu• Jianbo Zhang J. Q. YouConf. Secretary: Ms. JN LiEmail: ifts@zju.edu.cnTel: 0086-0571-87953967Institute for Fusion Theory and SimulationZhejiang UniversityWebsite:http://ifts.zju.edu.cn/about/?141.html
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Seven Lectures by Fulvio Zonca
2018-05-04
聚变理论与模拟中心英文网
Time: 9:00-12:00AM, 13:00-16:00PM，May 4 (Friday), May 7(Monday), May 9 (Wednesday), May 11(Friday), May14(Monday), May 16 (Wednesday), May 18 (Friday), May 21 (Monday), 2018 Location: Rm. 413, Bld. 11#, Yuquan Campus Main areas that will be explored are:(I) Variational methods in plasma physicsi) Constructing variational principles: Euler equations and Lagrangian A general methodology (Lecture 1) ii) Examples and applications of variational principles: Power dissipation in a passive resistive network Energy eigenvalues in quantum mechanics (Lecture 2) iii) Shear Alfvén waves in tokamaks. Variational formulation and variational principle Integral form of the dispersion relation (Lecture 3)(II)Wave propagation in slowly varying, weakly non-uniform media iv) Eikonal formulation of wave equations. Wave-packet amplitude evolution equation. (Lecture 4) v) The wave kinetic equation. Bound states and Schrödinger equation. (Lecture 5)(III) Description of Alfvén waves in tokamaks vi) Global eigenvalue problem in toroidal plasmas. The formation of meso-scales. (Lecture 6) vii) Time asymptotic solution and WKB dispersion relation. (Lecture 7)Prof. Zonca has made available online the lecture plan for the intensive course starting next week. http://www.afs.enea.it/zonca/references/seminars/IFTS_spring18/You are warmly welcomed to take part in it.
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12th Westlake International Symposium on Plasma Simulation
2018-04-26
聚变理论与模拟中心英文网
12th Westlake International Symposium on Plasma Simulation Institute for Fusion Theory and Simulation, Zhejiang University (IFTS-ZJU) will host the 12th Westlake International Symposium on Plasma Simulation at Zhejiang University, Hangzhou, China on May 3-5, 2018. The Symposium has been held annually since IFTS was established in 2006. Each of the past symposiums has focused on one particular area of plasma sciences including magnetic fusion physics, space plasma physics, laser plasma interaction as well as numerical simulations. The 12th Westlake International Symposium on Plasma Simulation will cover the following topics: magnetic confinement fusion, inertial confinement fusion, energetic particle physics, and space physics in all aspects including experiment, theory and simulation.Conference Form: Invited or Contributed Talks, PostersConference Language: EnglishSponsor: Institute for Fusion Theory and Simulation, Zhejiang UniversityLocal Organization Committee:Z. W. Ma, Z. M. Sheng, Y. Xiao, W.W. Xiao, Z.Y. Qiu Tentative schedule:May 2, 2018 (Saturday): RegistrationMay 3-5, 2018: Formal Meeting Pre-registration:Please return the attached form by email before April 20th , 2018.Contact: Ms. Jianing Li (Secretary) Email: ifts@zju.edu.cn Tel: +86-571-87953967 Registration Fees for each participant (On-site Payment by cash):Domestic ParticipantsInternational Participants Regular CNY￥1,800US$300StudentCNY￥900US$150 Attachment:T12th Westlake International Symposium on Plasma SimulationSign up FormNameAffiliationGenderTitle / PositionRegular/studentAddressPostcodeTelFaxE-MailTitle of talkBrief Abstract
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The 8th Asia-Pacific Transport Working Group (APTWG) International Conference
2018-03-29
聚变理论与模拟中心英文网
The 8th Asia-Pacific Transport Working Group (APTWG) International ConferenceThe 8th Asia-Pacific Transport Working Group (APTWG) International Conference will be held from June 12 to June 15, 2018 at The Engineering & Technical College of Chengdu University of Technology (ETCCUT), the Leshan campus of Southwestern Institute of Physics (SWIP), Leshan city, Sichuan Province, China. Important Dates January 20, 2018Website openApril 25, 2018Abstract submission deadlineApril 30, 2018Deadline for invitation letter for visa applicationApril 30, 2018,Online registration & hotel reservation deadline ContactsPlease contact aptwg2018@swip.ac.cn for further informationPlease find more detailed information at http://aptwg2018.swip.ac.cn/
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Four Tutorial Lectures from Prof. Allen Boozer (Columbia University)
2018-03-27
聚变理论与模拟中心英文网
Four Tutorial LecturesAllen BoozerProfessor, Columbia UniversityTime: 10:00am, March 29(Thursday), Stellarator Reactors: Size and Options13:30pm, March 30(Friday), Stellarator Optimization10:00am, April 2(Monday), Mathematical Description of Stellarators10:00am, April 3(Tuesday), What Next for StellaratorsLocation: Rm. 413, Bld. 11#, Yuquan Campus
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吴栋博士学术报告通知
2018-01-23
聚变理论与模拟中心英文网
题目：相对论强度激光与固体靶相互作用的PIC模拟: 等离子体物理和原子物理过程报告人：吴栋博士(中科院上海光学精密机械研究所) 时间：1月26日 上午9:00地点：中心会议室（教11 413-1）摘要：相对论强度激光与固体相互作用是众多重要基础应用的物理基础，然而这一过程却相当复杂，一般来说其研究分为两个部分，第一部分是位于靶前的激光直接电子加速 (Direct Laser Acceleration)；第二部分为超热电子在固体靶内的输运过程，该过程会触发一系列的等离子体物理与原子物理现象的耦合，这些现象包含：冷电子回流，欧姆加热，电离动力学，韧制辐射等。因此，我的报告分也为两个部分，即激光直接电子加速和超热电子靶内输运过程。相对论强度激光与固体靶相互作用会产生热电子，电子能量一般来说满足Beg标度律或Wilks标度律。然而当靶前存在预等离子体时，已有的标度律并不能描述超热电子的产生。我们提出并发展了两阶段电子加热和加速模型 [1]，分析了超热电子的来源，理论和计算机模拟都证实超热电子的温度满足的标度关系为T~(I L)^0.5，其中I为激光强度，L为等离子体密度标长。该模型还被进一步拓展到了圆偏振激光驱动的情形 [2]，以及激光与磁化固体靶相互作用的情形 [3, 4]。靶前产生的超热电子在固体靶内输运，会对靶体进行欧姆加热，并触发电离动力学。由于相对论强度的激光与固体靶的作用时间尺度仅为ps甚至fs量级，因此我们不能用平衡态电离模型来处理该电离过程，需要采用非平衡态模型 [5]。非平衡态电离模型应包含碰撞电离过程，电子-离子复合过程以及等离子体对电离势的压低效应，该模型已经植入到了我们的PIC程序。固体靶的电子密度很高，因此碰撞效应在电子输运过程中往往起到了主导作用。而固体靶内部电离过程并不充分，通常是部分电离态 (Partially ionized)。已有的碰撞模型是基于高温和低密度等离子体态发展来的，且只能处理自由电子的碰撞。我们在已有的碰撞模型的基础上，将束缚电子的贡献也考虑进来。我们的PIC程序可以用来处理部分电离态的碰撞过程 [6]。对于高Z金属靶，当超热电子的能量超过10 MeV时，辐射阻尼将超越碰撞阻尼 [7]，并显著地影响电子的输运过程，因此需要对碰撞模型进行辐射修正。韧制辐射过程也加入到了我们的PIC程序，韧制辐射频谱和空间角分布可以在PIC模拟中自恰地予以计算。参考文献：[1] D. Wu et al, Nucl. Fusion 57, 016007 (2017).[2] D. Wu et al, Phys. Plasmas 23, 123116 (2016).[3] D. Wu et al, Plasma Phys. Control. Fusion, 59, 065004 (2017).[4] D. Wu et al, Plasma Phys. Control. Fusion, 59, 095010 (2017).[5] D. Wu et al, Phys. Rev. E 95, 023208 (2017).[6] D. Wu et al, Phys. Rev. E 95, 023207 (2017).[7] D. Wu et al, arXiv.1703.05127, Journal of Computational Physics, submitted...报告人简介：吴栋，2015年7月博士毕业于北京大学应用物理与技术研究中心，导师为贺贤土院士和郑春阳研究员。2013年7月至2014年7月曾在美国加州大学圣地亚哥分校联合培养。2015年7月入职上海光机所，任助理研究员。2016年3月至-2017年3月曾在德国耶拿赫姆霍兹研究所交流访问一年。
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Second Announcement of the Hangzhou International Stellarator Workshop, March 26-28, 2018
2017-12-28
聚变理论与模拟中心英文网
Second ANNOUNCEMENT of The Hangzhou International Stellarator Workshop (HISW2018), March 26-28, 2018, Hangzhou, ChinaThe Hangzhou International Stellarator Workshop will be held in Hangzhou, China from March 26th, Monday to March 28th, Wednesday, in 2018. The workshop is being organized by Institute for Fusion Theory and Simulation (IFTS), Zhejiang University.This is first such stellarator meeting in China. Currently significant programs of stellarator research are being initiated in China. The University of South China is importing H1-N stellarator from Australian National University. The Southwest Jiaotong University in Chengdu is planning construction of a new quasi-symmetric stellarator. Zhejiang University in Hangzhou has started a stellarator theory program aiming for design and building of a new innovative stellarator. To help with all the initiatives, we are organizing a 3-day international workshop on stellarator/heliotron during March 26-28, 2018. The location will be in the city of Hangzhou where Zhejiang University is located. Hangzhou is well known for her scenic attractions and is only one hour away from Shanghai by high-speed trains. The purpose of the workshop is two folds: a) Provide a platform for discussion of current research and future direction of stellarator/heliotron both within China and abroad; b) Introduce stellarator physics and design to interested researchers in China.Topics of the workshop will include:Introduction to stellarator/heliotron configurations;Latest theoretical and experimental results;New stellarator programs in China;Future direction of stellarator research;Stellarator design and prospect for stellarator reactors.The confirmed invited speakers are listed below:Prof. David Anderson, University of Wisconsin, USAProf. Allen Boozer, Columbia University, USADr. Michael Drevlak, Max Planck Institute of Plasma Physics, GermanyDr. Yuhe Feng, Max Planck Institute of Plasma Physics, GermanyProf. Guoyong Fu, Zhejiang University, ChinaDr. David Gates, Princeton Plasma Physics Laboratory, USAProf. Carlos Hidalgo, Laboratorio Nacional de Fusión, SpainProf. Shoichi Okamura, National Institute for Fusion Science, JapanDr. Thomas Pedersen, Max Planck Institute of Plasma Physics, GermanyDr. Donald Spong, Oak Ridge National University, USAProf. Yuhong Xu, Southwest Jiaotong University, ChinaInstitute for Fusion Theory and SimulationHangzhou, ChinaJanuary 10, 2018
