Kinetic and fluid simulations of parallel electron transport during equilibria and transients in the Scrape-Off Layer

Kinetic and fluid simulations of parallel electron transport during equilibria and transients in the Scrape-Off Layer

Kinetic and fluid simulations of parallel electron transport during equilibria and transients in the Scrape-Off Layer 150 150 Mathew
UKAEA-CCFE-PR(21)76

Kinetic and fluid simulations of parallel electron transport during equilibria and transients in the Scrape-Off Layer

We present the first parallel electron transport results obtained using the newly developed 1D transport code SOL-KiT. In order to properly predict divertor heat loads it is of key importance to develop a thorough understanding of discrepancies between different parallel transport modelling approaches. With the capability to self-consistently switch between a kinetic and a fluid model for the electrons, we explore and report the differences in both equilibrium and transient simulations. Equilibria are obtained for an input power scan with parameters relevant to medium size tokamaks. Simulations of input power perturbations have been performed using both electron models. Significant kinetic effects are found during transients, especially in the behaviour of the electron sheath heat transmission coefficient, which shows up to an almost tenfold increase. We discuss the implications of the presented results to potential modelling decisions, as well as possible extensions to the used model.

Collection:
Journals
Journal:
Plasma Physics and Controlled Fusion
Publisher:
IOP (Institute of Physics)
Published date:
04/12/2021