Particle-in-cell simulations of two plasmon decay in a non-monotonic density profile

M. G. Senstius, S. K. Nielsen, R. G. L. Vann

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Abstract

Strong scattering during electron cyclotron resonance heating (ECRH) experiments in several magnetically confined fusion devices has been attributed to parametric decay instabilities (PDIs). Analytical modeling has shown that a non-monotonic density profile and excitation of trapped waves through two plasmon decay (TPD) play an important role. Using a particle-in-cell (PIC) code, decay of an X-mode wave into waves trapped inside a non-monotonic density profile is observed. The time evolution and composition of the daughter waves are investigated for different density profiles. A build up of the TPD daughter waves is only observed when they are supported by the plasma.
Original languageEnglish
Publication date2019
Number of pages4
Publication statusPublished - 2019
Event46th EPS Conference on Plasma Physics - Milan, Italy
Duration: 8 Jul 201912 Sep 2019

Conference

Conference46th EPS Conference on Plasma Physics
CountryItaly
CityMilan
Period08/07/201912/09/2019

Cite this

Senstius, M. G., Nielsen, S. K., & Vann, R. G. L. (2019). Particle-in-cell simulations of two plasmon decay in a non-monotonic density profile. Paper presented at 46th EPS Conference on Plasma Physics, Milan, Italy.