Speaker
Ors Asztalos
(Institute of Nuclear Techniques)
Description
The JT-60SA superconducting tokamak is proposed to be equipped with a Lithium Beam Emission Spectroscopy (LiBES) and Deuterium Beam Emission Spectroscopy (DBES) diagnostic systems. The purpose of the LiBES system is SOL and plasma edge density profile measurements and density fluctuation measurements in the SOL and outer edge regions, whereas the DBES system on the heating beams would have the capacity of density fluctuation measurements in the edge and the core regions, as well. The determination of the optimal location for the observation system, as well as the beam injection for the LiBES system, is of vital importance, for which the RENATE synthetic BES diagnostic simulator[1] was employed.
The RENATE synthetic BES diagnostic calculates the light emission along 3D modelled neutral beams for various beam materials using the collisional radiative model. A 3D observation module[2] returns the detected photon current values for an arbitrary detector array by accounting for arising geometrical effects.
Expected spatial resolution is studied in detail, which is defined as the emission smearing caused by a localized density perturbation. Deconstruction of the spatial resolution is possible into three components that can be individually studied and optimized: the contribution of the magnetic geometry, the contribution of the sensitive volume of the detector and the contribution of the atomic physics.
Considerations for an optimal LiBES system require sufficient beam penetration beyond the separatrix and reasonable SOL emission with regard to total emission, while an optimal DBES sytem requires mostly adequate spatial resolution and a sufficient Doppler shift to enable discrimination of beam emission from emission of the background plasma. Various concepts and geometries of the LiBES and DBES systems for JT60-SA are analysed in detail and several alternative arrangements are put forward for consideration.
[1] I.Pusztai etal. 2009 RSI 80 083-502
[2] D.Guszejnov etal. 2012 RSI 83 113-501
Co-authors
A. Kojima
(Japan Atomic Energy Agency, Mukouyama, Naka City, Ibaraki, Japan)
A. Kovacsik
(Institute of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary)
D. Dunai
(Wigner RCP, Hungarian Academy of Science, Budapest, Hungary)
G.I. Pokol
(Institute of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary)
K. Kamiya
(Japan Atomic Energy Agency, Mukouyama, Naka City, Ibaraki, Japan)
Ors Asztalos
(Institute of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary)
T. Suzuki
(Japan Atomic Energy Agency, Mukouyama, Naka City, Ibaraki, Japan)
