Influence of molecular dissociation on blob-induced atom density perturbations

作     者：Thrysoe, A. S. Madsen, J. Naulin, V Rasmussen, J. Juul 

作者机构：DTU Dept Phys PPFE DK-2800 Lyngby Denmark 

出 版 物：《NUCLEAR FUSION》 (Nucl Fusion)

年 卷 期：2018年第58卷第9期

页      面：096005-096005页

核心收录：

学科分类：08[工学] 0827[工学-核科学与技术] 0702[理学-物理学] 

基　　金：Euratom research and training programme 

主　　题：edge and SOL dynamics plasma-neutral interactions gas puff imaging GPI blobs neutrals 

摘      要：The effects of enhanced electron and ion pressure perturbations mediated in filamentary structures (blobs) on the densities of neutral atoms and molecules are investigated through a self-consistent dynamical fluid model for plasma and neutral fields. The electron and ion densities and pressures, and the generalized vorticity, are simulated by a 2D drift-fluid model in an edge and scrape-off layer slab domain of a toroidaliy magnetically confined plasma. The plasma dynamics are coupled with a diffusion model for densities of neutral atoms and molecules. The combined model allows for determining the response of the density of neutrals with various temperatures to blobs. It is found that blobs locally deplete densities of molecules and atoms that do not originate from dissociation of molecules, whereas the density of atoms created by dissociation may increase during blob events. The neutral species, their temperature, and origin should thus be taken into consideration when estimating the effect of blobs on neutral density perturbations when calculating emission rates, e.g, for gas puff imaging.