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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

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/

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

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。

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

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.

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.

Progress in laboratory exploration of astrophysical phenomena 2017-12-06 聚变理论与模拟中心 Title: Progress in laboratory exploration of astrophysical phenomena Speaker: Prof. C. Kang. Li, Massachusetts Institute of Technology Time: December 14 14:00-16:00 pm Venue: Rm. 413, Bld. 11#, Yuquan Campus Abstract： While astrophysical phenomena have traditionally been studied with observations, theoretical modeling, and numerical simulations,the advent of high-intensity, high-energy lasers made it possible of a more quantitative approach in laboratoriesfor validating and complementing such studies. Significant progresses haverecently been made in a series of experiments, including our work, for addressing the important issues. These efforts dramatically advance our understanding of, and provide important insight into many interesting fundamental astrophysical phenomena, including turbulent dynamo, magnetic reconnection,plasma Instabilities and spontaneous fields, astrophysical jets andcollisionless shocks, plasma nuclear science, equation of state, opacity, and pair electrons, etc. In this talk, astrophysical phenomena at extreme conditions and their relationship with high-energy-density plasmas created by lasers are outlined. The physics and methodology for connecting laboratory experiments to astrophysical phenomena will be discussed. We will highlight several recent laboratory experimentsthathave been manifested by numerous recent publications.

First announcement of the Hangzhou International Stellarator Workshop (HISW2018), March 26-28, 2018, Hangzhou, China 2017-11-08 聚变理论与模拟中心 The 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, ChinaDecember 5, 2017

上交大激光等离子体研究人员受邀到访及学术报告 2017-11-02 聚变理论与模拟中心武慧春教授邀请到上海交通大学激光等离子体物理研究所的陈民教授, 翁苏明研究员和远晓辉副研究员, 定于2017年11月6-7号进行学术交流. 陈民教授将关注毛细管放电在激光等离子体实验中的应用及其相关的放电数值模拟. 翁苏明研究员将报告其最近在强场物理中的极端法拉第旋转效应工作. 远晓辉副研究员将针对与浙大合作启动的高空气球实验进行交流.翁苏明研究员的报告日期：11月7号时间：14:00地点：教十一413摘要:Extreme case of Faraday effect in strongly magnetized plasmasSuming WengThe Faraday effect or Faraday rotation observed in 1846 was the first experimental evidence of the electromagnetic wave nature of light. In general, this effect causes a polarization rotation of light during its propagation along the magnetic field in a medium. In principle, this is caused by magneto-chiral dichroism of left-circularly polarized and right-circularly polarized electromagnetic waves propagating at differential phase speeds in magnetized materials. To date, the Faraday effect plays a pivot role in many applications such as the manipulation of light, and the probing of magnetic fields and material’s properties.In the talk, we will report an extreme case of the Faraday effect that a linearly polarized ultrashort laser pulse splits in time into two circularly polarized pulses of opposite handedness during its propagation in a highly magnetized plasma[1]. This offers a new degree of freedom to manipulate ultrashort and ultrahigh power laser pulses. Together with technologies of ultra-strong magnetic fields, it may pave the way for novel optical devices, such as magnetized plasma polarizers. The latter could allow the generation of circularly polarized laser pulses as high power as 10 PW in up-to-date laser facilities. The resultant high-power circularly polarized pulses are particularly attractive for laser-driven ion acceleration, and optical control of mesoscopic objects. In addition, it may offer a powerful means to measure strong magnetic fields broadly existing in objects in the universe and in laser–matter interactions in laboratories. Figure: Sketch and simulation result of the magnetic splitting of an ultrashort linearly polarized (LP) laser pulse, which is incident along the magnetic field B into a plasma. The right-circularly polarized (RCP) sub-pulse follows the left-circularly polarized (LCP) sub-pulse in time.[1] S. M. Weng, Q. Zhao, Z. M. Sheng et al.. Extreme case of Faraday effect: Magnetic splitting of ultrashort laser pulses in plasmas. Optica 4(9), 1086-1091 (2017).

陈骝教授学术报告通知 2017-10-09 聚变理论与模拟中心题目：Particle transport due to low-frequency electromagnetic fluctuations报告人：陈骝教授, IFTS,浙江大学&加州大学尔湾分校时间：10月12日（周四）下午3:00地点：教11-413欢迎各位老师和学生的参加！如有变动，另行通知！

中心专家来访--程钧博士 2017-06-27 聚变理论与模拟中心 Time: Thursday, June 29th, 2:00 pm Venue: Rm. 413, Bld. 11#, Yuquan CampusTitle:Experimental studies of low-intermediate-high confinement transition on HL-2A tokamakAbstract:Understanding L-H transition mechanisms is essential for providing a predictable power threshold for a successful operation of fusion reactor. The limit cycle oscillation (LCO), observed in slow L-H transition with expansion of time scale, provides opportunities for study of the nonlinear transition mechanism quantitatively. This report in detail introduces experimental studies of low-intermediate-high confinement mode transitions at marginal heating power on the HL-2A. The mutual interactions between the radial electric field, turbulence and mean pressure gradient are analyzed. The insight into the physics of H-mode is illustrated.个人简历：程钧, 博士, 副研究员。目前在HL-2A托卡马克装置上从事边缘等离子体物理与实验工作。在边缘极限振荡环、L-H转换以及边缘输运垒等物理机制领域取得许多创新性成果。获得过国家自然科学基金面上项目和国家磁约束专项人才项目的资助。在重要学术刊物Physics Review Letter , Nuclear Fusion 等杂志上发表学术论文30 余篇，多次在国际大会上做口头报告。代表性文章:1. J.Cheng, J.Q.Dong, K.Itoh, et al., Phys. Rev. Lett. 110, 265002 (2013)2. J.Cheng, J.Q.Dong, L.W.Yan, et al., Nucl. Fusion 53, 093008 (2014)3. J.Cheng, J.Q.Dong, LW.Yan, et al., Europhysics Letters 116, 150011 (2016)4. J. Cheng, J.Q.Dong, L.W.Yan, et al., Nucl. Fusion 53, 093008 (2013)5. J.Cheng, L.W.Yan, et al. , Plasma Phys. Control Fusion 52, 055003 (2010)6. J. Cheng, L.W.Yan, K.J.Zhao, et al., Nuclear Fusion 49, 085030 (2009)7. J.Cheng, L.W.Yan, J.Q.Dong, et al.,J. Nucl. Mater 438, S1200 (2013)8. J.Cheng, J.Q.Dong, L.W.Yan, et al., J. Nucl. Mater 463,455 (2015)

徐涵教授学术报告通知 2017-06-19 聚变理论与模拟中心题目：电子输运的流体与粒子混合模拟报告人：徐涵教授，国防科技大学时间：6月22日（周四）上午10：00-11：00地点：教11-413欢迎各位老师和学生的参加！如有变动，另行通知！

中心专家来访--Dr. Vinicius Duarte 2017-06-08 聚变理论与模拟中心 First Talk:Time: Thursday, June 15th, 3:00 pm Venue: Rm. 413, Bld. 11#, Yuquan CampusTitle about: Quasilinear relaxation formalism for energetic particle interaction with Alfvénic modesSpeaker: Dr. Vinicius Duarte, Univ. of Sao Paulo, BrazilAbstract ：Reduced kinetic models can be effective tools to address the transport of fast ions in tokamaks. In particular, we propose a resonance-broadened quasilinear diffusive framework in which the relevant variables are chosen to be the invariants of the unperturbed resonant particle Hamiltonian. The formulation describes the distribution function evolution in phase space and captures both regimes of isolated and overlapping modes. We show how linear perturbative MHD codes can be used to provide information such as eigenstructures, resonance surfaces and mode-particle interaction matrix elements, all of which are necessary for realistic modeling of experimental discharges. Preliminary numerical results are discussed, as well as the prospects of using the resonance-broadened quasilinear model for whole-device simulation through proper interfacing with global transport codes. Second Talk:Time: Tuesday, June 20th, 10:00 am Venue: Rm. 413, Bld. 11#, Yuquan CampusTitle about: Prediction of nonlinear evolution character of energetic-particle-driven instabilitiesSpeaker: Dr. Vinicius Duarte, Univ. of Sao Paulo, BrazilAbstract ：Energetic-particle-driven instabilities can seriously limit the performance of present-day and next-generation fusion devices. We propose a criterion for the likely nature of losses of fast ions in tokamaks to be in the convective or diffusive nonlinear regimes. The criterion, which is shown to be rather sensitive to collisional and micro-turbulent processes, ultimately translates into a condition for the applicability of quasilinear modeling for realistic tokamak eigenmodes scenarios. The criterion is tested and validated against NSTX and DIII-D, where the chirping mode behavior is shown to be in accord with the model. It has been found that the anomalous fast ion transport is a likely mediator of the transition between the fixed-frequency mode behavior and rapid chirping in tokamaks. In addition, micro-turbulence appears to resolve the disparity with respect to the ubiquitous chirping observation in spherical tokamaks and its rarer occurrence in conventional tokamaks.

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