68 citations · 308 across the 22 of their papers we have counts for
22 papers
Comparison of saturation rules used for gyrokinetic quasilinear transport modeling
Scott E. Parker, Calder Haubrich, Qiheng Cai +2
Theory-based transport modeling has been widely successful and is built on the foundations of quasilinear theory. Specifically, the quasilinear expression of the flux can be used i…
Dynamics of rapidly spinning blob-filaments: fluid theory with a parallel kinetic extension
J. R. Myra, J. Cheng, S. E. Parker
Blob-filaments (or simply 'blobs') are coherent structures formed by turbulence and sustained by nonlinear processes in the edge and scrape-off layer (SOL) of tokamaks and other ma…
Transport Barrier and Spinning Blob Dynamics in the Tokamak Edge
Junyi Cheng, James Myra, Seung-Hoe Ku +3
In this work, we investigate the dynamics of plasma blobs in the edge of magnetic confinement devices using a full-f gyrokinetic particle-in-cell code with X-point geometry. In sim…
Correspondence between open bosonic systems and stochastic differential equations
Alexander Engel, Scott E. Parker
Bosonic mean-field theories can approximate the dynamics of systems of bosons provided that . We show that there can also be an exact correspondence at finite when…
Zonal Flow Excitation in Electron-Scale Tokamak Turbulence
Stefan Tirkas, Haotian Chen, Gabriele Merlo +2
The derivation of an intermediate-scale gyrokinetic-electron theory in nonuniform tokamak plasmas [Chen H. et al 2021 Nucl. Fusion 61 066017] has shown that a Navier-Stokes type no…
Verification of a Fully Implicit Particle-in-Cell Method for the Formalism of Electromagnetic Gyrokinetics in the XGC Code
Benjamin J. Sturdevant, S. Ku, L. Chacón +8
A fully implicit particle-in-cell method for handling the -formalism of electromagnetic gyrokinetics has been implemented in XGC. By choosing the -formali…
Equilibration of the planar modes of ultracold two dimensional ion crystals in a Penning trap
Chen Tang, Athreya Shankar, Dominic Meiser +3
Planar thermal equilibration is studied using direct numerical simulations of ultracold two-dimensional (2D) ion crystals in a Penning trap with a rotating wall. The large magnetic…
Linear embedding of nonlinear dynamical systems and prospects for efficient quantum algorithms
Alexander Engel, Graeme Smith, Scott E. Parker
The simulation of large nonlinear dynamical systems, including systems generated by discretization of hyperbolic partial differential equations, can be computationally demanding. S…
Excitation of Zonal Flow by Intermediate-Scale Toroidal Electron Temperature Gradient Turbulence
Haotian Chen, Stefan Tirkas, Scott E. Parker
We show that zonal flow can be preferentially excited by intermediate-scale toroidal electron temperature gradient (ETG) turbulence in tokamak plasmas. Previous theoretical studies…
Major Scientific Challenges and Opportunities in Understanding Magnetic Reconnection and Related Explosive Phenomena in Solar and Heliospheric Plasmas
H. Ji, J. Karpen, A. Alt +105
Magnetic reconnection underlies many explosive phenomena in the heliosphere and in laboratory plasmas. The new research capabilities in theory/simulations, observations, and labora…
Broadening of the drumhead mode spectrum due to in-plane thermal fluctuations of two-dimensional trapped ion crystals in a Penning trap
Athreya Shankar, Chen Tang, Matthew Affolter +5
Two-dimensional crystals of ions stored in Penning traps are a leading platform for quantum simulation and sensing experiments. For small amplitudes, the out-of-plane motion of suc…
Major Scientific Challenges and Opportunities in Understanding Magnetic Reconnection and Related Explosive Phenomena throughout the Universe
H. Ji, A. Alt, S. Antiochos +97
This white paper summarizes major scientific challenges and opportunities in understanding magnetic reconnection and related explosive phenomena as a fundamental plasma process.
Comparison of edge turbulence characteristics between DIII-D and C-Mod simulations with XGC1
I. Keramidas Charidakos, J. R. Myra, S. Ku +4
The physical processes taking place at the edge region are crucial for the operation of tokamaks as they govern the interaction of hot plasma with the vessel walls. Numerical model…
Quantum Algorithm for the Vlasov Equation
Alexander Engel, Graeme Smith, Scott E. Parker
The Vlasov-Maxwell system of equations, which describes classical plasma physics, is extremely challenging to solve, even by numerical simulation on powerful computers. By lineariz…
First principle simulation of ultra-cold ion crystals in a Penning trap with Doppler cooling and a rotating wall potential
Chen Tang, Dominic Meiser, John J. Bollinger +1
A direct numerical simulation of many interacting ions in a Penning trap with a rotating wall is presented. The ion dynamics is modelled classically. Both axial and planar Doppler…
Efficient Fourier Basis Particle Simulation
Matthew S. Mitchell, Matthew T. Miecnikowski, Gregory Beylkin +1
The standard particle-in-cell algorithm suffers from grid heating. There exists a gridless alternative which bypasses the deposition step and calculates each Fourier mode of the ch…
A tight-coupling scheme sharing minimum information across a spatial interface between gyrokinetic turbulence codes
Julien Dominski, Seung-Hoe Ku, Choong-Seock Chang +5
A new scheme that tightly couples kinetic turbulence codes across a spatial interface is introduced. This scheme evolves from considerations of competing strategies and down-select…
Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation
I. Keramidas Charidakos, J. R. Myra, S. Parker +4
The SOL width is a parameter of paramount importance in modern tokamaks as it controls the power density deposited at the divertor plates, critical for plasma-facing material survi…
Global Gyrokinetic Simulation of Tokamak Edge Pedestal Instabilities
Weigang Wan, Scott E. Parker, Yang Chen +3
Global electromagnetic gyrokinetic simulations show the existence of near threshold conditions for both a high- kinetic ballooning mode (KBM) and an intermediate- kinetic ver…
Natural Fueling of a Tokamak Fusion Reactor
Weigang Wan, Scott E. Parker, Yang Chen +1
A natural fueling mechanism that helps to maintain the main core deuterium and tritium (DT) density profiles in a tokamak fusion reactor is discussed. In H-mode plasmas dominated b…
Simulating Plasma Turbulence in Tokamaks
Jeremy Kepner, Scott Parker, Viktor Decyk
A challenging and fundamental research problem is the better understanding and control of the turbulent transport of heat in present-day tokamak fusion experiments. Recent developm…
Massively Parallel Computing of Turbulent Transport in Tokamaks
Jeremy Kepner, Scott Parker, Viktor Decyk
With the advent of the gyrokinetic formalism, recent developments in low-noise nonlinear methods, and enormous gains in computing power, large-scale gyrokinetic simulations ha…