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5 papers · 2 filters
Vacuum magnetic fields with exact quasisymmetry near a flux surface. Part 1: Solutions near an axisymmetric surface
Wrick Sengupta, Elizabeth J. Paul, Harold Weitzner +1
While several results have pointed to the existence of exactly quasisymmetric fields on a surface (Garren & Boozer 1991a,b; Plunk & Helander 2018), we have obtained the first such…
Steady State versus Pulsed Tokamak Reactors
Daniel J. Segal, Antoine J. Cerfon, Jeffrey P. Freidberg
We have carried out a detailed analysis that compares steady state versus pulsed tokamak reactors. The motivations are as follows. Steady state current drive has turned out to be m…
Dimits shift, avalanche-like bursts, and Solitary propagating structures in the two-field Flux-Balanced Hasegawa-Wakatani model for plasma edge turbulence
Di Qi, Andrew J. Majda, Antoine J. Cerfon
We show that the recently introduced two-field flux-balanced Hasegawa-Wakatani (BHW) model captures the key features of drift-wave turbulent transport mediated by zonal flows obser…
Construction of Quasisymmetric Stellarators Using a Direct Coordinate Approach
R. Jorge, W. Sengupta, M. Landreman
Optimized stellarator configurations and their analytical properties are obtained using a near-axis expansion approach. Such configurations are associated with good confinement as…
Charged particle dynamics near an X-point of a non-symmetric magnetic field with closed field lines
E. Elbarmi, W. Sengupta, H. Weitzner
Understanding particle drifts in a non-symmetric magnetic field is of primary interest in designing optimized stellarators to minimize the neoclassical radial loss of particles. Qu…