Speaker
Gergo Pokol
(Institute of Nuclear Techniques)
Description
The HESEL code has been used to simulate scrape-off-layer (SOL) electrostatic interchange-driven low-frequency turbulence in various EAST tokamak discharges [1]. The recently installed Lithium Beam Emission Spectroscopy (LiBES) diagnostic system on EAST provides well resolved non-intrusive 2D measurements of SOL turbulence [2]. This paper presents results of comparison of statistical properties of simulated and measured SOL turbulence making use of the RENATE synthetic beam emission diagnostic [3]. It has been found that the blob dynamics involves spatial scales that are strongly affected by the limited spatial resolution of the LiBES system, thus detailed modelling of the LiBES diagnostic is essential.For the purpose of comparison, discharges with optimal diagnostic performance have been selected from the latest campaign. HESEL simulations were carried out using the geometry of a 2D slab perpendicular to the magnetic field lines at the outboard midplane, and provide time dependent density and temperature fields. For the purpose of interfacing with the RENATE synthetic diagnostic, these 2D fields were toroidally extended along magnetic field lines to provide 3D fluctuating density and temperature fields. These were then used for the detailed 3D simulation of the BES diagnostic system with RENATE at every time instance, including effects resulting from a spatially extended beam and arrangement of the viewing optical system, as well as the effect of atomic physics processes in the beam. Comparison of simulated and measured SOL turbulence was based mostly on spectral and correlation methods that are typically used in experiments.
[1] N. Yan et al. 2013 PPCF 55 115007[2] To be published in Rev. Sci. Instrum.[3] D. Guszejnov et al. 2012 RSI 83 113-501
Co-authors
A.H. Nielsen
(Department of Physics, Technical University of Denmark, Lyngby, Denmark)
A.S. Thrysøe
(Department of Physics, Technical University of Denmark, Lyngby, Denmark)
B.W. Schießl
(Department of Physics, Technical University of Denmark, Lyngby, Denmark)
D. Dunai
(Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary)
G.H. Hu
(Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China)
Gergo Pokol
(Institute of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary)
O. Asztalos
(Institute of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary)
S. Zoletnik
(Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary)
V. Naulin
(Department of Physics, Technical University of Denmark, Lyngby, Denmark)
