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P: Fachverband Plasmaphysik

P 17: Poster Session - Helmholtz Graduate School for Plasma Physics

P 17.2: Poster

Mittwoch, 19. März 2014, 16:30–18:30, SPA Foyer

The role of collisions in 2D gyrokinetic turbulence: the freely decaying electrostatic case — •Silvio Sergio Cerri, Alejandro Banon Navarro, Hauke Doerk, Daniel Told, and Frank Jenko — Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Boltzmannstraße 2, D-85748 Garching.

Turbulence in weakly collisional magnetized plasmas is one of the most fascinating and challenging topics, both for astrophysical and laboratory plasmas. In this context, collisional gyrokinetic theory plays an important role.

We present a study of freely-decaying 2D electrostatic turbulence on the sub-ion Larmor scale by means of numerical simulations with the gyrokinetic code GENE [1]. The effect of the collisionality regime on the turbulent spectra is here systematically investigated. In the low collisionality regime, we show an excellent agreement with the existing analytical theory [2,3] and previous numerical investigations [4–6]. However, we find deviations from the theory for increasing collision frequency. In this intermediate collisionality regime, non-universal power laws due to multiscale dissipation arise.

[1] GENE webpage: http://www.ipp.mpg.de/∼fsj/gene/

[2] Schekochihin et al., Plasma Phys. Control. Fusion 50, 124024 (2008)

[3] Plunk et al., J. Fluid Mech. 664, 407 (2010)

[4] Tatsuno et al., Phys. Rev. Lett. 103, 015003 (2009)

[5] Tatsuno et al., J. Plasma Fusion Res. 9, 509 (2010)

[6] Tatsuno et al., Phys. Plasmas 19, 122305 (2012)