Effect of Turbulence on Electron Cyclotron Current Drive and Heating in ITER

Effect of Turbulence on Electron Cyclotron Current Drive and Heating in ITER

Effect of Turbulence on Electron Cyclotron Current Drive and Heating in ITER 150 150 Mathew
CCFE-PR(15)02

Effect of Turbulence on Electron Cyclotron Current Drive and Heating in ITER

Non-linear local electromagnetic gyrokinetic turbulence simulations of the ITER standard scenario H-mode are presented for the q = 3 / 2 and q = 2 surfaces. The turbulent transport is examined in regions of velocity space characteristic of electrons heated by electron cyclotron waves. Electro- magnetic fluctuations and sub-dominant micro-tearing modes are found to contribute significantly to the transport of the accelerated electrons, even though they have only a small impact on the transport of the bulk species. The particle diffusivity for resonant passing electrons is found to be less than 0.15 m 2 s -1 , and their heat conductivity is found to be less than 2 m 2 s -1 . Implications for the broadening of the current drive and energy deposition in ITER are discussed.

Collection:
Journals
Journal:
Nuclear Fusion
Publisher:
IOP
Published date:
01/01/2015