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Title: Arbitrary-wavelength, dynamic-strong-flow gyrokinetics
Author: Sharma, Amil Yograj
ISNI:       0000 0004 5916 0690
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2016
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Gyrokinetics is a maximally optimal description of low-frequency magnetised plasma turbulence. We present a generalisation of gyrokinetic theory that allows dynamic strong flows and is valid for arbitrary-wavelength electrostatic potential perturbations in slab magnetic geometry. We obtain a substantially simpler gyrocentre Lagrangian than that of Dimits (2010a,b). We present a symplectic strong-flow generalisation of gyrokinetic field theory such that, unlike Dimits (2010a,b), our Vlasov-Poisson system is manifestly conservative as, ultimately, we obtain it as a whole, directly from our gyrocentre particle Lagrangian (Scott and Smirnov, 2010). Despite the symplectic representation of our strong-flow theory, our Poisson equation is consistent with that for weak flows (Hahm, 1988) at all wavelengths and the fluid equation obtained from our Vlasov-Poisson system is consistent with fluid theory. Again, despite our symplectic representation, we demonstrate numerical tractability by solving implicit dependences using an iterative scheme. Weak-and strong- flow code verification are performed in limits that admit analytic comparison. Simulations show strong-flow symmetry breaking of the Kelvin-Helmholtz in-stability of a shear layer and blobs that manifest as asymmetries in the growth rate and propagation, respectively, that depend on the sign of the parallel vorticity.
Supervisor: Not available Sponsor: Engineering and Physical Sciences Research Council
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics