Category Archives: 邀请报告
2015年4月1日 五室第五十三期研讨会 邀请报告
题 目： From GYRO to CGYRO: new methods for collisions in gyro kinetics 下载
报告人： Dr. Jeff Candy（GA）
题 目: SOME UNSOLVED CHALLENGES IN RF HEATING AND CURRENT DRIVE
报告人： Prof. Nathaniel Fisch Princeton Plasma Physics Laboratory, U.S.A
Several unsolved challenges in rf heating and current drive are highlighted. These include current drive in magnetic geometries in which the toroidal magnetic field cannot be assumed to be dominant, current start-up with hyper-resistivity, current drive with oscillating parameters, and synergistic effects between current drive and alpha channeling. These challenges are not necessarily straightforward to address, and it is possible that the challenges cannot even be met, but were they met, at least in some cases, there is the potential of significant consequence.
题 目: METHODS OF RF CURRENT DRIVE
报告人： Prof. Nathaniel Fisch, Princeton Plasma Physics Laboratory, U.S.A
Radio frequency waves can penetrate thermonuclear plasmas, depositing momentum and energy with great selectively: in select resonant ions or electrons, in select resonant regions, and with select momentum. When these waves are injected asymmetrically with respect to the toroidal direction in tokamaks, they can drive toroidal electric current. The advantage of driving this current by waves is that a tokamak reactor might then be operated in the steady state. This talk will review at an elementary level the fundamental processes of wave-particle interactions in plasma that underlie the current-drive effect.
报告题目：Resolving the physics of anisotropy, flow and chaotic fields
报告人 ：澳大利亚国立大学 Matthew J. Hole博士 （下载）
题 目：Fluctuations, Nonlinear Waves, Stabilization and Zonal Flow
～Comparison between Theory and Experiment～（Part II–1）
报告人：Heiji Sanuki (佐贯平二)
时 间：2011年6月14日（周二） 上午9：00–10：00
Stabilization（control）of Instabilities and/or Fluctuations in Plasmas (due to Velocity Shear effect and PM Force)
Stabilization due to Plasma rotation or electric field shear, Stabilization by P.M. Force, Confinement Improvement by Plasma Rotation, Generation Mechanism of E, Plasma Rotation EXP., E-field stabilization mech., Timofeev mode,
题 目：Understanding disruptions in tokamaks
主讲人：Leonid E. Zakharov (PPPL. USA)
时 间：2011年11月29号 下午15：30
摘 要：This is an invited APS-2011 talk summarizing progress in disruption theory during the past 4 years. In particular, new plasma physics effects, such as wall touching kink modes and Hiro currents, were identified as key players in vertical disruptions events. Also the necessity of new approaches for numerical simulations was understood, and the 2-D version of Disruption Simulation Code reproducing the above mentioned effects was created. The community-wide interpretation of the tile current measurements in tokamaks as the halo currents is discussed.
题 目：Advances in Electromagnetics and Plasma Computation
主讲人：Professor John R. Cary
This talk will review some of the basics of plasma computation, including the Particle-In-Cell method, that can be used for scientific discovery through computation. It will then discuss the process of code verification and validation, which provide confidence in the computational results. Finally we will review some of the discoveries made through computation, in particular through use of the computational framework, VORPAL. These include discoveries in laser-plasma acceleration, accelerator cavity optimization, and RF heating of plasma.
Professor John R. Cary graduated with a BA in Math and Physics from the University of California, Irvine, and received his MA and Ph.D. in Physics from the University of California at Berkeley. Prof. Cary spent two years at the Los Alamos National Laboratory and four years at the Institute for Fusion Studies (University of Texas).
In 1984, Prof. Cary went to the University of Colorado (CU) at Boulder, where he has been the primary graduate thesis advisor for nine graduate students. At CU, Prof. Cary has served as Department Chair, Director, and Area Teaching Scholar. In the latter position he mentored all incoming faculty in the Natural Sciences in teaching and proposal writing. Prof. Cary currently is the chief executive office of Tech-X corporation which develops scientific modeling and distributed computing software products and advanced technologies for research, engineering and education.
Professor Cary's research is in the areas of computational physics, plasma physics, beam physics, and nonlinear dynamics. He has published more than eighty articles in refereed journals, and has given more than fifty invited talks. His current interests include high-performance computing and distributed computing, especially as applied to the analysis of physical systems.
题 目：Micro-Instabilities of Tokamak Edge Pedestal
主讲人:Weigang Wan（University of Colorado at Boulder, USA. )
时 间：12月6日(周二) 上午9：00
We study micro turbulence of the tokamak edge pedestal with global and flux tube gyrokinetic particle simulations using the electromagnetic particle code GEM. In global simulations, three different sets of DIII-D H-mode experimental profiles are used and the simulation results exhibit quite similar characteristics. The dominant instabilities appear to be two kinds of modes with comparable linear growth rates: a low n, high frequency mode that propagates in the electron diamagnetic direction and a high n, low frequency mode that propagates in the ion direction. The global results of the high n mode agree with our flux tube simulations, which are well benchmarked against other codes in the same study, including GYRO, GTC and HD7. These results are important for the EPED model which is developed to predict the maximum height and width of the edge pedestal. I will also review some recent experimental and simulation progress in this area.