TY - JOUR
T1 - KNOSOS
T2 - A fast orbit-averaging neoclassical code for stellarator geometry
AU - Velasco, J. L.
AU - Calvo, I.
AU - Parra, F. I.
AU - García-Regaña, J. M.
N1 - Funding Information:
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No. 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission. This research was supported in part by grant ENE2015-70142-P , Ministerio de Economía y Competitividad , Spain, by grant PGC2018-095307-B-I00 , Ministerio de Ciencia, Innovación y Universidades , Spain, and by the Y2018/NMT [PROMETEO-CM] project of the Comunidad de Madrid , Spain.
Funding Information:
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This research was supported in part by grant ENE2015-70142-P, Ministerio de Econom?a y Competitividad, Spain, by grant PGC2018-095307-B-I00, Ministerio de Ciencia, Innovaci?n y Universidades, Spain, and by the Y2018/NMT [PROMETEO-CM] project of the Comunidad de Madrid, Spain.
Publisher Copyright:
© 2020 EURATOM
PY - 2020/10/1
Y1 - 2020/10/1
N2 - KNOSOS (KiNetic Orbit-averaging SOlver for Stellarators) is a freely available, open-source code (https://github.com/joseluisvelasco/KNOSOS) that calculates neoclassical transport in low-collisionality plasmas of three-dimensional magnetic confinement devices by solving the radially local drift-kinetic and quasineutrality equations. The main feature of KNOSOS is that it relies on orbit-averaging to solve the drift-kinetic equation very fast. KNOSOS treats rigorously the effect of the component of the magnetic drift that is tangent to magnetic surfaces, and of the component of the electrostatic potential that varies on the flux surface, φ1. Furthermore, the equation solved is linear in φ1, which permits an efficient solution of the quasineutrality equation. As long as the radially local approach is valid, KNOSOS can be applied to the calculation of neoclassical transport in stellarators (helias, heliotrons, heliacs, etc.) and tokamaks with broken axisymmetry. In this paper, we show several calculations for the stellarators W7-X, LHD, NCSX and TJ-II that provide benchmark with standard local codes and demonstrate the advantages of this approach.
AB - KNOSOS (KiNetic Orbit-averaging SOlver for Stellarators) is a freely available, open-source code (https://github.com/joseluisvelasco/KNOSOS) that calculates neoclassical transport in low-collisionality plasmas of three-dimensional magnetic confinement devices by solving the radially local drift-kinetic and quasineutrality equations. The main feature of KNOSOS is that it relies on orbit-averaging to solve the drift-kinetic equation very fast. KNOSOS treats rigorously the effect of the component of the magnetic drift that is tangent to magnetic surfaces, and of the component of the electrostatic potential that varies on the flux surface, φ1. Furthermore, the equation solved is linear in φ1, which permits an efficient solution of the quasineutrality equation. As long as the radially local approach is valid, KNOSOS can be applied to the calculation of neoclassical transport in stellarators (helias, heliotrons, heliacs, etc.) and tokamaks with broken axisymmetry. In this paper, we show several calculations for the stellarators W7-X, LHD, NCSX and TJ-II that provide benchmark with standard local codes and demonstrate the advantages of this approach.
KW - Magnetic confinement fusion
KW - Neoclassical theory
KW - Optimisation
KW - Stellarators
KW - Transport
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U2 - 10.1016/j.jcp.2020.109512
DO - 10.1016/j.jcp.2020.109512
M3 - Article
AN - SCOPUS:85087456837
SN - 0021-9991
VL - 418
JO - Journal of Computational Physics
JF - Journal of Computational Physics
M1 - 109512
ER -