Abstract Details
Abstracts
Author: Euichan Jung
Requested Type: Poster
Submitted: 2025-03-14 07:33:08
Co-authors: Felix I. Parra
Contact Info:
Princeton Plasma Physics Laboratory
101 Stellarator Road
Princeton, 08540
USA
Abstract Text:
Scrape-off layer (SOL) physics in the low-collisionality regime differs from the conventional fluid-like, collisional SOL. In the collisionless case, passing orbits are immediately lost along open field lines, significantly distorting the particle distribution function away from a Maxwellian. Such a low-collisionality SOL has received less attention because in most experiments, abundant neutrals lead to high plasma density and low temperature at the edge. However, recent results from lithium-coated wall tokamaks, distinguished by their enhanced confinement and heat handling capability, show SOLs with collisionality similar to that of the core. Here, we present a neoclassical transport model for a collisionless scrape-off layer, including the identification of five different types of orbit confinement in a diverted tokamak configuration. The identified confined orbits define the boundary conditions for the orbit-averaged drift kinetic equation, whose lowest-order solutions are numerically computed using a linearized collision operator. The resulting kinetic distribution predicts radial and poloidal variations in density, velocity, and temperature profiles inside and outside the separatrix.
Characterization: 2.0
Comments: