Self‐Consistent Simulations of the Plasma‐Wall Transition Layer

Abstract

In the present work we develop a 1d3v (1D in space and 3D in velocity) kinetic Particle-in-cell model of the magnetised plasma-wall transition layer, where the charged and neutral particle dynamics and interaction between them is included in a fully self-consistent way. The plasma-surface interactions are described via fixed emission coefficients for the secondary particles. We obtained different profiles of plasma and neutral particles and cross-checked classical boundary conditions, which are usually formulated inside the PWT.

The Particle‐In‐Cell Method

“…Interesting to note that this number has been derived few decades ago when the number of simulation time steps was typically of the order of N t ∼ 10 4 . From (15) we obtain ω = ω 0 (1 − 1/24(ω 0 ∆t)…”

Kinetic Modelling of the Plasma Recombination

“…Atomic/molecular collisions in BIT1 code are performed via nonlinear binary null-collision method introduced in [14]. The collision operator consists of two steps, finding of collision pairs and the collision itself (for details see [14]). Collection and derivation of the corresponding collision crosssections represents a complex task and will be discussed in details.…”

“…In the present paper we consider a qualitative model keeping simulated plasma edge as simple as possible: the model includes electrons, deuterium ions and atoms, impurity atoms and ions (C,C + ) and nonlinear interaction between them: elastic, excitation, ionization, charge exchange and recombination collisions (e.g. see [13,14]). Plasma recycling coefficients at the divertors are assumed to be 1.…”

Energy Conservation Tests of a Coupled Kinetic-kinetic Plasma-neutral Transport Code

“…In the problems run to date, the time spent in the plasma-neutral collision routines is too small compared with the rest of the code (see section 2.5) to justify the implementation of a more efficient algorithm, e.g., as in [28].…”