27 citations · 102 across the 8 of their papers we have counts for
9 papers
A positive-definite form of bounce-averaged quasilinear velocity diffusion for the parallel inhomogeneity in a tokamak
Jungpyo Lee, David Smithe, John Wright +1
In this paper, the analytical form of the quasilinear diffusion coefficients is modified from the Kennel-Engelmann diffusion coefficients to guarantee the positive definiteness of…
Quasilinear diffusion coefficients in a finite Larmor radius expansion for ion cyclotron heated plasmas
Jungpyo Lee, John Wright, Nicola Bertelli +4
In this paper, a reduced model of quasilinear diffusion by a small Larmor radius approximation is derived to couple the Maxwell's equations and the Fokker-Planck equation self-cons…
An analytic scaling relation for the maximum tokamak elongation against n=0 MHD resistive wall modes
Jungpyo Lee, Jeffrey P. Freidberg, Antoine J. Cerfon +1
A highly elongated plasma is desirable in order to increase plasma pressure and energy confinement to maximize fusion power output. However, there is a limit to the maximum achieva…
Effect of the Shafranov shift and the gradient of on intrinsic momentum transport in up-down asymmetric tokamaks
Justin Ball, Felix I. Parra, Jungpyo Lee +1
Tokamaks with up-down asymmetric poloidal cross-sections spontaneously rotate due to turbulent transport of momentum. In this work, we investigate the effect of the Shafranov shift…
Tokamak elongation: how much is too much? I Theory
Jeff P. Freidberg, Antoin Cerfon, Jungpyo Lee
In this and the accompanying paper the problem of the maximally achievable elongation in a tokamak is investigated. The work represents an extension of many earlier studies, which…
Turbulent momentum transport due to neoclassical flows
Jungpyo Lee, Michael Barnes, Felix I Parra +2
Intrinsic toroidal rotation in a tokamak can be driven by turbulent momentum transport due to neoclassical flow effects breaking a symmetry of turbulence. In this paper we categori…
ECOM: a fast and accurate solver for toroidal axisymmetric MHD equilibria
Jungpyo Lee, Antoine Cerfon
We present ECOM (Equilibrium solver via COnformal Mapping), a fast and accurate fixed boundary solver for toroidally axisymmetric magnetohydrodynamic equilibria with or without a t…
Turbulent momentum pinch of diamagnetic flows in a tokamak
Jungpyo Lee, Felix I. Parra, Michael Barnes
The ion toroidal rotation in a tokamak consists of an flow due to the radial electric field and a diamagnetic flow due to the radial pressure gradient. The turbulent pi…
Perpendicular momentum injection by lower hybrid wave in a tokamak
Jungpyo Lee, Felix I. Parra, Ron R. Parker +1
The injection of lower hybrid waves for current drive into a tokamak affects the profile of intrinsic rotation. In this article, the momentum deposition by the lower hybrid wave on…