Limitations, insights and improvements to gyrokinetics

Journal article

We first consider gyrokinetic quasineutrality limitations when evaluating the axisymmetric radial electric field in a non-turbulent tokamak by an improved examination of intrinsic ambipolarity. We next prove that the background ions in a pedestal of poloidal ion gyroradius scale must be Maxwellian and nearly isothermal in Pfirsch-Schlüter and banana regime tokamak plasmas, and then consider zonal flow behaviour in a pedestal. Finally, we focus on a simplifying procedure for our transport time scale hybrid gyrokinetic-fluid treatment that removes the limitations of gyrokinetic quasineutrality and remains valid in the pedestal. © 2009 IAEA, Vienna.

Authors: Catto, P; Parra, F; Kagan, G; Simakov, A

• Publication status: Published
• Journal: NUCLEAR FUSION
• Volume: 49
• Issue: 9
• Pages: 095026-095026
• Publication date: 2009-09-01
• DOI: 10.1088/0029-5515/49/9/095026
• EISSN: 1741-4326
• ISSN: 0029-5515
• Language: English