CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Gyrokinetic simulations of particle transport in pellet fuelled JET discharges

Daniel Tegnered (Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi) ; Michael Oberparleiter (Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi) ; Hans Nordman (Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi) ; Pär Strand (Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi) ; Luca Garzotti ; Ivan Lupelli ; Colin Roach ; Michele Romanelli ; Martin Valovic
Plasma Physics and Controlled Fusion (0741-3335). Vol. 59 (2017), 10, p. Art.no. 105005.
[Artikel, refereegranskad vetenskaplig]

Pellet injection is a likely fuelling method of reactor grade plasmas. When the pellet ablates, it will transiently perturb the density and temperature profiles of the plasma. This will in turn change dimensionless parameters such as a/Ln,a/LT and plasma β. The microstability properties of the plasma then changes which influences the transport of heat and particles. In this paper, gyrokinetic simulations of a JET L-mode pellet fuelled discharge are performed. The ion temperature gradient/trapped electron mode turbulence is compared at the time point when the effect from the pellet is the most pronounced with a hollow density profile and when the profiles have relaxed again. Linear and nonlinear simulations are performed using the gyrokinetic code GENE including electromagnetic effects and collisions in a realistic geometry in local mode. Furthermore, global nonlinear simulations are performed in order to assess any nonlocal effects. It is found that the positive density gradient has a stabilizing effect that is partly counteracted by the increased temperature gradient in the this region. The effective diffusion coefficients are reduced in the positive density region region compared to the intra pellet time point. No major effect on the turbulent transport due to nonlocal effects are observed.



Den här publikationen ingår i följande styrkeområden:

Läs mer om Chalmers styrkeområden  

Denna post skapades 2017-08-16. Senast ändrad 2017-09-14.
CPL Pubid: 251229

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi (2013-2017)

Ämnesområden

Energi
Hållbar utveckling
Plasmafysik med fusion

Chalmers infrastruktur