Core micro-instability analysis of JET hybrid and baseline discharges with carbon wall
Artikel i vetenskaplig tidskrift, 2014

The core micro-instability characteristics of hybrid and baseline plasmas in a selected set of JET plasmas with carbon wall are investigated through local linear and non-linear and global linear gyro-kinetic simulations with the GYRO code (Candy and Belli 2011 General Atomics Report GA-A26818). In particular, we study the role of plasma pressure on the micro-instabilities, and scan the parameter space for the important plasma parameters responsible for the onset and stabilization of the modes under experimental conditions. We find that a good core confinement due to strong stabilization of the micro-turbulence driven transport can be expected in the hybrid plasmas due to the stabilizing effect of the fast ion pressure that is more effective at the low magnetic shear of the hybrid discharges. While parallel velocity gradient destabilization is important for the inner core, at outer radii the hybrid plasmas may benefit from a strong quench of the turbulence transport by E×B rotation shear.

global simulation

experimental modeling

gyrokinetic simulation

JET tokamak

hybrid discharge

Författare

Istvan Pusztai

Chalmers, Teknisk fysik, Nukleär teknik

I Voitsekhovitch

L Garzotti

C Bourdelle

M J Pueschel

I Lupelli

M Romanelli

the JET-EFDA Contributors

Nuclear Fusion

0029-5515 (ISSN)

Vol. 54 123016-

Styrkeområden

Energi

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1088/0029-5515/54/12/123016