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Core micro-instability analysis of JET hybrid and baseline discharges with carbon wall

Sara Moradi ; István Pusztai (Institutionen för 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). Vol. 54 (2014), p. 123016.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: gyrokinetic simulation, experimental modeling, JET tokamak, hybrid discharge, global simulation

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Denna post skapades 2014-11-24. Senast ändrad 2015-07-28.
CPL Pubid: 206399


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)


Plasmafysik med fusion

Chalmers infrastruktur