%0 Conference Paper
%A Liang, y.
%T Effect of magnetic topology on MHD and transport in magnetic confinement fusion
%M FZJ-2015-04532
%D 2015
%X Effect of magnetic topology on MHD and transport in magnetic confinement fusion Y. Liang *Forschungszentrum Jülich GmbH, IEK-4, 52425 Jülich, GermanyCurrently,  the  most  advanced  concepts  for fusion  confinement  are  the  tokamak  and  the stellarator. The former is toroidally symmetric and 2D; the latter is a 3D device with a smaller degree of symmetry. The tokamak  scheme is currently a   leading   variant   for   plasma confinement  and  is  therefore  being used  for  the  ITER  design  and  is  planned  for  the  DEMO reactor. It has recently been realized that 3D magnetic topology effects also play a significant role in this 2D concept. The results obtained from various tokamaks have shown that magnetic field perturbations can  either  completely  suppress edge localized  modes (ELMs), trigger  small  ELMs  during ELM free periods, or affect the frequency and size of the type- ELMs in a controllable way, preserving  good  global  energy  confinement  [1,2].  Although  the  physic s  mechanism  is  still unclear,  experimental  results  from  those  different  devices  demonstrate  that  the  magnetic topology plays a key role in plasma confinement [3], edge MHD stability [4], and interactions between  the  plasma  and  the  first  wall,  particularly  with  the divertor [5-7]. Recently, 3D magnetic  topology effects  form  one  of  the  hottest  topics  in  fusion  research  today,  and understanding them is essential for the success of future fusion devices. In this paper, an overview of physics understanding of various 3D effects on major MHD activities,  i.e. tearing  modes  and edge - localized  modes, [5-7], and plasma  edge [8] and divertor transports [9-11] in magnetically  confined  plasmas will  be  presented .  In  addition, comparing  the  advantages  and  disadvantages  of  2D  and  3D magnetic  topology effects  in magnetic confinement fusion will be discussed.
%B 5th Asia Pacific Transport Working Group (APTWG) International Conference
%C 8 Jun 2015 - 12 Jun 2015, Dalian (China)
Y2 8 Jun 2015 - 12 Jun 2015
M2 Dalian, China
%F PUB:(DE-HGF)1
%9 Abstract
%U https://juser.fz-juelich.de/record/202243