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DTSTAMP:20220812T074335Z
LOCATION:Darwin Room
DTSTART;TZID=Europe/Stockholm:20220629T140000
DTEND;TZID=Europe/Stockholm:20220629T143000
UID:submissions.pasc-conference.org_PASC22_sess153_msa247@linklings.com
SUMMARY:Investigating Magnetic Fluctuations in Gyrokinetic Simulations of 
 the Tokamak Scrape-Off Layer using Discontinuous Galerkin Methods
DESCRIPTION:Minisymposium\n\nInvestigating Magnetic Fluctuations in Gyroki
 netic Simulations of the Tokamak Scrape-Off Layer using Discontinuous Gale
 rkin Methods\n\nMandell, Hammett, Hakim, Francisquez\n\nGkeyll, a full-f c
 ontinuum electromagnetic gyrokinetic code, is being developed to study tur
 bulence in the edge region of fusion devices. The edge region involves lar
 ge-amplitude fluctuations, electromagnetic effects, and plasma interaction
 s with material walls, making it more computationally challenging than the
  core region. Gkeyll models the turbulence by solving the 5D full-f gyroki
 netic system in Hamiltonian form using an energy-conserving high-order dis
 continuous Galerkin scheme. Electromagnetic perturbations are included via
  a symplectic (v_parallel) formulation, and the scheme avoids the Ampere c
 ancellation problem. Collisions are modeled by a conservative Lenard-Berns
 tein operator. Sheath effects from interactions with the end plates are mo
 deled by conducting-sheath boundary conditions. We present nonlinear simul
 ation results demonstrating that cross-field transport in the scrape-off l
 ayer (SOL) can be moderately increased by electromagnetic effects in high-
 beta regimes, resulting in broadening of the electron heat-flux width on t
 he endplates. The results also indicate that the standard ideal MHD balloo
 ning stability limit can be exceeded in the SOL. We show additional simula
 tion results that demonstrate reduction of transport when finite magnetic 
 shear is included in the SOL geometry. We finally show preliminary simulat
 ion results using a realistic SOL geometry that includes shaping, flux exp
 ansion, and strong magnetic shear near X points.\n\nDomain: Computer Scien
 ce and Applied Mathematics, Physics
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