April 4-6

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Author: Giovanni Lapenta
Requested Type: Poster
Submitted: 2022-03-04 02:33:02

Co-authors: J. Amaya, J. Ren, J. Croonen

Contact Info:
KU Leuven
Celesijnenlaan 200B
Leuven,   3001

Abstract Text:
Many processes in magnetically confined plasmas require the inclusion of electron physics. When this is the case, the hypothesis that the phase space can be reduced to 5 dimensions is not always tenable. An important example is reconnection, where near the reconnection site the electronic physics becomes fully 6D. Our approach for this case is the implicit PIC that provides a useful approach for full device simulation. We present the Energy Conserving Semi Implicit (ECsim) method [1] which allows the treatment of macroscopic problems with a complete 6D description. The resolution can be chosen according to the necessary precision without lack of energy saving. The energy remains exactly preserved to the precision of the machine, a feature that greatly reduces the occurrence of numerical instabilities. ECsim was developed in a massively parallel code that scales efficiently on the latest supercomputers [3]. The code has been applied to 2D cylindrical problems [4] and to fully 3D models of fusion devices [5]. We report the application of the code to the study of magnetic reconnection within magnetically confined plasmas.

[1] Lapenta,G.(2017).JCP,334,349.
[2] Lapenta,G.,Gonzalez-Herrero,D.,&Boella,E.(2017).JPP,83(2).
[3] Gonzalez-Herrero,D.,Boella,E.,&Lapenta,G.(2018).CPC,229,162.
[4] Gonzalez-Herrero,D.,Micera,A.,Boella,E.,Park,J.,&Lapenta,G.(2019).CPC,236,153.
[5] Park, J., Lapenta, G., Gonzalez-Herrero, D., & Krall, N. A. (2019). Frontiers in Astronomy and Space Sciences, 6, 74.