München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.3: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Improvement of the Sauter model for the bootstrap current in tokamaks — •Andreas Redl1,2, Clemente Angioni1, Emily Belli3, Olivier Sauter4, and Hartmut Zohm1,21Max-Planck-Institut für Plasmaphysik, Garching, Deutschland — 2Fakultät für Physik, LMU, München, Deutschland — 3General Atomics, San Diego, USA — 4Swiss Plasma Center, EPFL, Switzerland

In tokamaks, the radial gradients of densities and temperatures produce the bootstrap current, parallel to the magnetic field. This current is an important part of the total plasma current, particularly in advanced scenarios where the Ohmic current is kept limited. A precise calculation of the bootstrap current is essential for realistic reconstructions of the current density profile, as well as for the computation of transport and MHD instabilities. A widely used model is the Sauter model[1].Due to its analytical form, it is very practical to be included in codes, without requiring additional computational time. However, comparisons with the more recently developed code NEO[2], a highly benchmarked fast drift-kinetic solver for neoclassical transport, show that the Sauter model can significantly deviate, particularly at high collisionality, which limits its applicability to the calculation of edge stability. Having realized this disagreement, we plan to improve the Sauter model by keeping the same analytical structure, but modifying the numerical coefficients in order to increase the agreement with NEO. The first results of this project will be presented. [1] O. Sauter et al Phys. Plasmas 6, 2834 (1999), ibid. 9 5140 (2002). [2] E.A. Belli and J. Candy, Plasma Phys. Control. Fusion 54, 015015 (2012).

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