2020年1月17日 五室第135期研讨会

2020117 五室第135期研讨会

题  目: Comparisons of different lower divertor geometry candidates for EAST by using SOLPS-ITER simulations

报告人: 贾国章

主持人: 黄跃恒

时 间: 2020年1月17日(星期五)    15:00—16:30

地 点: 6楼中间会议室

摘 要:

Divertor is a critical component in exhausting power and particle fluxes from the hot core plasma for present/future Tokamaks. The geometry shape of divertors can play essential roles in protection of surrounding walls, impurity screening, hydrogen recycling, and pumping. In order to fulfill the requirement of future high-power and long-pulse H-mode discharges over 1000s in EAST, the present lower graphite divertor will be upgraded to a tungsten (W) divertor. The first priority required for the new divertor is relatively lower power loads onto the targets, while sufficient pumping performance for particle control and lower W-sputtering rate are also essential factors. Several related cases are compared in aspects of density threshold for detachment, pumping capability, and power exhaust by using the SOLPS-ITER code suite.


2020年1月9日 五室第134期研讨会

202019 五室第134期研讨会

题  目: Progress and Remaining Issues in Integrated Modeling for Core Plasma in CFETR



 间:2020年1月9日(星期四)    15:00—16:30

地 点:6楼中间会议室

摘 要:

Core-Pedestal integrated modeling shows that it is necessary to operate with high density to meet the high fusion power target (~1GW) for CFETR. High density operation require efficient current drive to sustain the plasma current in both the hybrid scenario and steady-state scenarios. Steady-state scenario is designed with high poloidal beta condition and a localized reversed magnetic shear, which reduces the energy/particle transport in the intermediate radial region. Composition of helicon current drive, electron cyclotron current drive and bootstrap current can sustain the localized reversed magnetic shear, the location of which is optimized to make the normalized beta lower than the empirical limit without wall (4li).The ongoing works include to review the transport of fuel ions and impurities, the stabilization of global resistive modes and the nonlinear behavior of edge localized modes in these scenarios.

(This is an unfinished work yet.)


2020年1月6日 五室第133期研讨会

202016 五室第133期研讨会

题  目: Prospect of plasma theory and simulation research for JA DEMO  ( Dr. YAGI Masatoshi)

  摘  要:In Japan, the Joint Special Design Team for Fusion DEMO contributes to develop JA DEMO as the national team. Recently, plasma theory and simulation working group has drawn up an intermediate term research plan to contribute the conceptual design of JA DEMO. In this presentation, we will briefly introduce the activity of plasma theory and simulation research for DEMO.

题  目: Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence  Dr. SETO Haruki

摘  要:An interplay between fluctuation driven toroidal axisymmetric flows (

convective cell modes) and resistive ballooning mode turbulence after the pedestal collapse is numerically studied by a four-field reduced MHD model in the BOUT++ framework. The strong flow shear sup- presses the radial transport of pressure filaments, and the pressure profile in the pedestal region is partially recovered. As a result, a secondary instability is quasi-linearly excited, which yields a secondary collapse. The subsequent damped oscillation is also analyzed by phase diagram analysis.

题  目: Characteristics of ITG turbulence and associated global profile

formation in flux-driven gyrokinetic simulation ( Dr. WANG Wei)

摘  要:Global nature of multi-scale turbulence is of specifically importance in

understanding and evaluating transport levels in Tokamak plasmas. Based on flux-driven gyrokinetic simulations using GKNET, characteristics of ITG turbulence and associated global profile formation are discussed through several approaches including Fourier-based analyses and the newly developed size-PDF analysis

主持人: 项农

时  间:2019年1月6日(星期一)  14:00—16:30

地  点:4楼中间会议室 ~欢迎全所感兴趣的同志

2020年1月3日 五室第132期研讨会

202013 五室第132期研讨会

题目:First application of the self-consistently coupled full-wave/Fokker-Planck analysis for the modeling of the LHW experiment on EAST



   间: 2020年1月3日(星期五)  15:30—16:30



Lower hybrid wave is the most important auxiliary heating and current drive tool on EAST.  Both ray-tracing and full wave codes have been used to model the LHW physics for the EAST experiments. Recently the self-consistently coupled full-wave/Fokker-Planck analysis has been successfully carried out for this domain. The process of the iteration between the full wave code(TORLH) and the Fokker-Planck code(CQL3D) will be introduced. The results including the spectrums with poloidal broadening, the wave electric fields, the power density profiles and the electron distribution function will be presented..




        2019年12月5日我室召开2019年度职工工作总结会议,本次会议旨在回顾我室2019年度科研总体进展情况,同时部署2020年度的工作的重点 。



2019年12月27日 五室第131期研讨会

20191227 五室第131期研讨会

题  目:The simulation of plasma response to RMP in BOUT++ framework

报告人 桂彬

主持人: 杨程

时  间:2019年12月27日(星期五)  15:00—16:30

地  点:4楼中间会议室

  摘  要:

Resonant magnetic perturbations (RMP) have extensively been demonstrated as a plausible technique for mitigating or suppressing large edge localized modes (ELMs). The plasma response to RMP plays a key role in the suppression of ELM with RMPs. A linear model of plasma response is developed in BOUT++ framework. The penetration process of the resonant component of the radial magnetic field is achieved from the simulation. Also its dependence on resistivity and plasma rotation is also obtained.


2019年12月20日 五室第130研讨会

 目:Hybrid simulation of fishbone instabilities with reversed safety factor profile



 间:2019年12月20日(星期五)  14:30—15:30



Linear stability and nonlinear dynamics of the fishbone instabilities with reversed safety factor profile have been investigated by the global kinetic-magnetohydrodynamic (MHD) code M3D-K. For the consideration of the fishbone instability, there are two different types of the fishbone instability: dual resonant fishbone (DRF) with double q = 1 surfaces and non-resonant fishbone (NRF) with the minimum value of safety factor qmin a little larger than unity. Based on EAST-like parameters, linear simulations show that the DRF is excited by the trapped beam ions when the fast ion pressure increases to exceed a critical value, and the mode structure of DRF exhibits splitting feature due to double q = 1 surfaces. When qmin increases from below unity to above unity, the fishbone instability transits from the DRF to the NRF, and the mode frequency of the NRF is higher than the DRF as the NRF is resonant with fast ions with larger precessional frequency. Nonlinear simulations show that the saturation of the DRF is due to MHD nonlinearity with a large n = 0 component. However, the saturation of the NRF is mainly due to the nonlinearity of fast ions, and the frequency of the NRF chirps down nonlinearly. The fast ions are redistributed and become flattened due to the DRF or the NRF, and the transport level of the fast ions due to the NRF is weaker with more centrally radial redistribution region in comparison with the DRF.





2019年12月13日 五室第129研讨会

20191213 五室第129研讨会 

   目:3D Modeling of ICRF Coupling on EAST Tokamak



   间: 2019年12月13日(星期五)  15:00—16:30



Radiofrequency wave in ion cyclotron range of frequency (ICRF) is an important way for heating plasma, driving current and implementing plasma control in the magnetic fusion devices such as EAST and ITER tokamak. Achieving good coupling of ICRF power into the plasma is an essential issue for high power ICRF injection on EAST tokamak. In this talk, we present the Modeling of ICRF power injected into 3D EAST plasmas via the high performance Finite-difference time-domain (FDTD) model in VSim software. Realistic 3D ICRF antenna module and box of the B-port on EAST have been constructed as geometry in the simulations. The effects of antenna structure, antenna phase, minority ion, distance between antenna and plasma, and toroidal curvature on the ICRF coupling and propagation are discussed.


2019年12月6日 五室第128研讨会

2019126 五室第128研讨会 

  目:Recent progress in the development of gyrokinetic semi-Lagrangian code NLT



 间: 2019年12月6日(星期五)  15:00—16:30



Large-scale gyrokinetic simulation has become an indispensable tool to study low frequency phenomena in tokamak plasmas, including turbulence transport, zonal flows and energetic particle physics.  NLT is a 5D continuum gyrokinetic code based on the I-transform theory model. In this talk, a brief introduction to the basic gyrokinetic theory and simulation models will be given. Recent progresses in the code development, including multi-ion species, kinetic electrons and the hybrid spectral semi-Lagrangian method will be reported.