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13th International West Lake Symposium – Extreme Radiation Physics
2019-04-22
聚变理论与模拟中心
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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项锡锦硕士答辩通知
2019-02-25
聚变理论与模拟中心
硕士论文题目：尾隆分布下高能量粒子激发的测地声模的线性模拟答辩人：项锡锦指导老师：傅国勇 教授答辩委员会：主席：李 定 研究员 中国科学院物理研究所委员：高 翔 研究员 中国科学院等离子体研究所 傅国勇 教 授 浙江大学物理学系 马志为 教 授 浙江大学物理学系 盛正卯 教 授 浙江大学物理学系 朱国怀 教 授 浙江大学物理学系 仇志勇 副教授 浙江大学物理学系答辩时间：2019 年 3 月 1 日（周五）下午 15:00答辩地点：浙江大学玉泉校区教 11 - 413摘要：A systematic study of global energetic particle-induced geodesic acoustic mode (EGAM) has been carried out for bump-on-tail energetic distribution in tokamak plasmas using linear kinetic-fluid hybrid simulation. The stability threshold of EGAM in energetic particle pressure is found to be very low. The eigenmode structure becomes more and more radially extended as beam ion distribution evolves from bump-on-tail distribution to fully slowing-down distribution. The mode radial scale length increases with energetic particle orbit width.
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王涛博士论文答辩通知
2019-02-25
聚变理论与模拟中心
博士论文题目：聚变等离子体中剪切阿尔芬波和高能量粒子动理学的混合模拟研究答辩人：王涛指导老师：仇志勇 副教授，Fulvio Zonca 教授答辩委员会：主席：李 定 研究员 中国科学院物理研究所委员：高 翔 研究员 中国科学院等离子体研究所 傅国勇 教 授 浙江大学物理学系 马志为 教 授 浙江大学物理学系 盛正卯 教 授 浙江大学物理学系 朱国怀 教 授 浙江大学物理学系 仇志勇 副教授 浙江大学物理学系答辩时间：2019 年 3 月 1 日（周五）下午 14:00答辩地点：浙江大学玉泉校区教 11 - 413摘要：在 ITER 等未来磁约束聚变装置中，高能量粒子对燃料等离子体的加热是维持燃烧状态的关键。然而，高能量粒子可以共振地激发剪切阿尔芬波等集体不稳定性，从而可能影响它们的约束性质。本论文通过 HMGC 模拟，研究了燃烧等离子体中的剪切阿尔芬波和高能量粒子动理学，其中主要包含了 RSAE 和 TAE 两类不稳定性。模拟发现，二者最不稳定的环向模数处在 10 的量级，符合理论估计。在波-粒子非线性相互作用中，模拟发现 RSAE 可以引发共振磁捕获粒子的对流性输运，径向去耦是重要的饱和机制。而在强驱动下，TAE 可能导致通行粒子的扩散性输运和高能量粒子的明显损失。其中，相空间共振岛重叠是共振粒子轨道随机化的主要原因。
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魏西硕博士论文答辩
2018-12-04
聚变理论与模拟中心
博士论文题目：托卡马克台基区的离子极化密度修正答辩人：魏西硕导师：肖湧 教授 答辩委员会：主席：傅国勇 教授 浙江大学物理系委员：高翔 研究员 中国科学院等离子体研究所马志为 教授 浙江大学物理系盛正卯 教授 浙江大学物理系王少杰 教授 中国科学技术大学许敏 研究员 核工业西南物理研究院答辩时间：2018年12月7日（星期五）上午10:00答辩地点：浙江大学玉泉校区第12教学楼423室欢迎大家参加！
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赵忱博士论文答辩通知
2018-08-31
聚变理论与模拟中心
论文题目：tokamak耗散捕获电子模数值模拟论文摘要：计算机数值模拟，是研究磁约束聚变物理的重要手段之一，在经过了20年左右的发展后，基于第一性原理的回旋动理学模拟已经成为了研究磁约束聚变数最重要的模拟方法之一，各种代码（GTC，GTS等）相继被开发并用于研究中。本文主要通过使用GTC代码详细研究了基于EAST近期实验数据的边缘台基区的不稳定性、级联（cascading）和湍流输运。由于在托卡马克台基区温度较低，碰撞频率较大，这导致在边缘区域出现一种碰撞起主要作用的耗散型捕获电子模（DTEM）的静电模，我们通过建立理论模型以及使用GTC代码数值模拟详细研究了这种不稳定性在边缘参数下的各种性质。我们发现在边缘区域中，这种不稳定性的线性增长率随碰撞频率的增大而增加，但是频率随碰撞频率的增长变化不大。而且这种不稳定性的线性阶段呈不规则气球模结构，其结构的峰值并不是传统的局域在极向面的外侧中平面附近，而是出现在局域在极向角0~2π的任何位置出现多峰值。在非线性模拟结果中，我们发现碰撞可以使耗散部或电子模（DTEM）的cascading方向不同于无碰撞捕获电子模（CTEM）的cascading方向。此外，我们发现DTEM湍流输运主要以对流（convective）输运为主，而且随着碰撞频率的增加，粒子输运和热输运的输运系数都会降低。答辩人：赵忱导师：肖湧 教授时间：2018年9月1日（星期六）10：00地点：浙江大学玉泉校区第11教学楼413室热烈欢迎感兴趣的师生参加！
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Talk by Dr. Chang Liu of PPPL at 2pm，May 7th, Monday
2018-05-06
聚变理论与模拟中心
Time: Monday, May 7, at 2pmLocation: Rm. 413, Bld. 11#, Yuquan Campus Title: Magnetic moment of runaway electrons and collisionless pitch-angle scatteringChang LiuPrinceton Plasma Physics LaboratoryAbstract:The conservation of magnetic moment is one of the fundamental principles in the theory of charged particle motion in magnetic fields, but it was recently challenged by the results of full-orbit simulation of runaway electrons. The phenomenon is called “collisionless pitch-angle scattering”, which claims that for highly-energetic electrons moving in curved magnetic field geometry like tokamaks, the parallel moment can be transferred to perpendicular momentum and thus the magnetic moment is not conserved. In this work, we manage to address this issue by revisiting the standard guiding-center theory and its high-order corrections. In addition to the classical guiding-center ordering, we introduce a new assumption that for runaway electrons, perpendicular momentum is much smaller than the parallel component. With the help of this assumption, we can easily derive the Lagrangian and Hamiltonian of runaway electrons using Lie-perturbation method to the second order. The new magnetic moment derived from this theory now depends on both the perpendicular and the parallel momentum. Using this magnetic moment, we can explain the collisionless pitch-angle scattering found in full-orbit simulations. Benchmarking with the simulation results, it is found that the new magnetic moment has a much better conservation property than the standard one. Our work points out the correct way to apply guiding-center approximation for energetic runaway electrons and paves the road for the development of a new guiding-center simulation framework.
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Seven Lectures by Fulvio Zonca
2018-05-04
聚变理论与模拟中心
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
等离子体模拟西湖国际会议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
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
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
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
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
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Local and global analysis of symmetry breaking for ITG and BAE modes
2017-12-19
聚变理论与模拟中心
Title: Local and global analysis of symmetry breaking for ITG and BAE modesSpeaker: Dr. Zhixin Lu, Max-Planck-Institut for PlasmaphysikTime: December 21 09:00 amVenue: Rm. 413, Bld. 11#, Yuquan CampusYou are warmly welcomed to take part in it.
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Progress in direct-drive inertial confinement fusion
2017-12-11
聚变理论与模拟中心
Title: Progress in direct-drive inertial confinement fusion Speaker: Prof. R. Betti, University of Rochester Time: December 14 14:00-16:00 pm Venue: Rm. 413, Bld. 11#, Yuquan Campus Abstract：Recent progress in the design of direct drive inertial fusion implosions has led to record fusion yields on the OMEGA laser of the University of Rochester. A new design methodology was developed that uses a statistical mapping of past experiments onto a simulation database. This procedure assumes that the hydrodynamic codes used in implosion designs lack the necessary physics and that measurements of implosion properties are imperfect. It also assumes that while the measurements may have significant systematic errors, the shot-to-shot variations are small and that cryogenic implosion data are reproducible as observed on OMEGA. In addition to improved target design options, the statistical mapping also provides an accurate tool for predicting implosion performance. This methodology is being tested first on low-convergenceimplosions and will subsequently be applied to implosions with increasing convergence up to the level required for a hydro-equivalent demonstration of ignition. Furthermore, the results from this experimental campaign have been used to test the validity of the physics models used in the radiation--hydrodynamics codes.
