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Articles With Citations to Z. Abou-Assaleh

Theoretical Plasma Physics

Controlled Thermonuclear Fusion Energy

2021

Simulation of the SPARC plasma boundary with the UEDGE code
S.B. Ballinger,1, A.Q. Kuang, M.V. Umansky, D. Brunner, J.M. Canik, M. Greenwald1, J.D Lore, B. LaBombard1, J.L. Terry, M. Wigram

Published 5 July 2021 • © 2021 IAEA, Vienna
Nuclear Fusion, Volume 61, Number 8

https://iopscience.iop.org/article/10.1088/1741-4326/ac0c2f/meta

Abstract

In this work, the UEDGE edge transport code is used to examine conditions in the SPARC divertor and edge plasma for various levels of carbon impurity and power from the core (PSOL). A double-null magnetic configuration is simulated assuming up-down symmetry in geometry and physics. The anomalous heat and particle transport coefficients are tuned to match empirical predictions for SPARC's midplane density profiles, target plate heat flux profiles, and inner/outer divertor power sharing. Convective transport is included on the low-field side, while on the high-field side the transport is modeled as purely diffusive. Hydrogen neutrals are modeled as a fluid with inertial effects, and a carbon impurity is included using the fixed-fraction model. We find that detachment induced by impurity seeding could significantly reduce the heat flux to the divertor surfaces in the SPARC tokamak. At PSOL = 28 MW (the value predicted for SPARC's full-power H-mode scenario) cases with both divertor legs detached were obtained with a carbon impurity fraction between 0.3%–1.4%, far below Zeff limits for SPARC. When the plasma in the outer leg is detached, the peak heat flux density perpendicular to the target plate is below 1 MW m−2, electron and ion temperatures are less than 1.5 eV, and momentum detachment is observed. However, the detachment state is found to be sensitive to the side-wall boundary conditions, the level of neutral pumping, and the target plate tilt. Finally, a broadly similar SOLPS simulation of SPARC is used to assess the appropriateness of the simpler impurity and neutral models used in UEDGE.

Computer Physics Communications
Volume 258, January 2021, 107600

https://www.sciencedirect.com/science/article/abs/pii/S0010465520302873#aep-article-footnote-id1

https://arxiv.org/pdf/2003.00769.pdf

SOL-KiT—Fully implicit code for kinetic simulation of parallel electron transport in the tokamak Scrape-Off Layer

S.Mijina,.Antony, F.Militello, R.J.Kinghama

Blackett Lab., Plasma Physics Group, Imperial College, London SW7 2AZ, UK

CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK

Abstract

Here we present a new code for modelling electron kinetics in the tokamak Scrape-Off Layer (SOL). SOL-KiT (Scrape-Off Layer Kinetic Transport) is a fully implicit 1D code with kinetic (or fluid) electrons, fluid (or stationary) ions, and diffusive neutrals. The code is designed for fundamental exploration of non-local physics in the SOL and utilizes an arbitrary degree Legendre polynomial decomposition of the electron distribution function, treating both electron–ion and electron–atom collisions. We present a novel method for ensuring particle and energy conservation in inelastic and superelastic collisions, as well as the first full treatment of the logical boundary condition in the Legendre polynomial formalism. To our knowledge, SOL-KiT is the first fully implicit arbitrary degree harmonic kinetic code, offering a conservative and self-consistent approach to fluid–kinetic comparison with its integrated fluid electron mode. In this paper we give the model equations and their discretizations, as well as showing the results of a number of verification/benchmarking simulations.

 

 

Reference

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[16] Z. Abou-Assaleh, J. P. Matte, T. W. Johnston, R. Marchand, Fokker-Planck Modelling of Edge Plasma Near the Neutralizer Plate in a
Tokamak, Contrib. Plasma Phys. 32 (3/4) (1992) 268–272. doi:10.1002/ctpp.2150320315.

[17] Z. AbouAssaleh, M. Petravic, R. Vesey, J. P. Matte, T. W. Johnston, NonLocal Transport in a Tokamak Plasma Divertor with Recycling,
Contrib. Plasma Phys. 34 (2/3) (1994) 175–179. doi:10.1002/ctpp.2150340213

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