Shear-induced Reynolds stress at the edge of L-mode tokamak plasmas
نویسندگان
چکیده
منابع مشابه
Shear induced Reynolds stress at the edge of L-mode tokamak plasmas
The turbulent flux of momentum or Reynolds stress is a mechanism responsible for the generation of sheared flow by turbulence. The structure of the flux surface averaged stress 〈ṽrṽ⊥〉 is investigated in the edge region of a L-mode tokamak plasma. The stress induced by the perpendicular tilting of ballooning modes is considered. Besides the tilting by the E×B flow shear, which is a negative visc...
متن کاملMagnetohydrodynamic stability analyses of tokamak edge plasmas
s of publications 1-5: 1. An ELMy ASDEX Upgrade plasma equilibrium is reconstructed taking into accountthe bootstrap current. The peeling mode stability of the equilibrium is numericallyanalysed using the GATO [1] code, and it is found that the bootstrap current candrive the plasma peeling mode unstable. A high-n ballooning mode stability analysisof the equilibria revealed that,...
متن کاملGyrokinetic Simulation of Tokamak Edge Plasmas
It has been recently discovered that the trapped electron mode (TEM) may play an important role in the H mode edge plasma for domestic tokamaks such as EAST and HL-2A. The stability and transport for TEM for the edge parameters are studied using large scale gyrokinetic particle simulations. The gyrokinetic simulation reveals the parametric dependences on the wavelength and collisionality. The b...
متن کاملDrift Ballooning Instabilities in Tokamak Edge Plasmas
The linear stability of high-toroidal-number drift-ballooning modes in tokamaks is investigated with a model that includes resistive and viscous dissipation, and assumes the mode frequency to be comparable to both the sound and diamagnetic frequencies. The coupled effect of ion drift waves and electron drift-acoustic waves is shown to be important, resulting in destabilization over an intermedi...
متن کاملshear suppression of turbulence in diverted H-mode plasmas; role of edge magnetic shear
s. We show that strong edge magnetic shear which is generic to divertor plasmas makes the shearing of turbulence eddys in toroidal geometry more effective. From calculations of the shearing rates for KSTAR edge parameters, we conclude that the enhanced magnetic shear at the diverted KSTAR plasma edge facilitates shear suppression of turbulence and ensuing H-mode transition.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 2012
ISSN: 0029-5515,1741-4326
DOI: 10.1088/0029-5515/52/10/103013