Alpha particles diffusion due to charge changes
Abstract
Alpha particles diffusion due to charge changes in a magnetized plasma is studied. Analytical calculations and numerical simulations are employed to show that this process can be very important in the pedestal-edge-SOL regions. This is the first study that presents clear evidence of the importance of atomic processes on the diffusion of alpha particles. A simple 1D model that includes inelastic collisions with plasma species, “cold” neutrals, and partially ionized species was employed. The code, which follows the exact particle orbits and includes the effect of inelastic collisions via a Monte Carlo type random process, runs on a graphic processor unit (GPU). The analytical and numerical results show excellent agreement when a uniform background (plasma and cold species) is assumed. The simulations also show that the gradients in the density of the plasma and cold species, which are large and opposite in the edge region, produce an inward flux of alpha particles. Calculations of the alpha particles flux reaching the walls or divertor plates should include these processes.
- Authors:
-
- Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica and Universidad Nacional de Cuyo, Av. Bustillo 9500, 8400 Bariloche (Argentina)
- Publication Date:
- OSTI Identifier:
- 22489924
- Resource Type:
- Journal Article
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALPHA PARTICLES; COLLISIONS; COMPUTERIZED SIMULATION; DIFFUSION; DIVERTORS; MONTE CARLO METHOD; ORBITS; PLASMA; PLASMA DENSITY; PLASMA SCRAPE-OFF LAYER; RANDOMNESS
Citation Formats
Clauser, C. F., E-mail: cesar.clauser@ib.edu.ar, and Farengo, R. Alpha particles diffusion due to charge changes. United States: N. p., 2015.
Web. doi:10.1063/1.4936875.
Clauser, C. F., E-mail: cesar.clauser@ib.edu.ar, & Farengo, R. Alpha particles diffusion due to charge changes. United States. https://doi.org/10.1063/1.4936875
Clauser, C. F., E-mail: cesar.clauser@ib.edu.ar, and Farengo, R. 2015.
"Alpha particles diffusion due to charge changes". United States. https://doi.org/10.1063/1.4936875.
@article{osti_22489924,
title = {Alpha particles diffusion due to charge changes},
author = {Clauser, C. F., E-mail: cesar.clauser@ib.edu.ar and Farengo, R.},
abstractNote = {Alpha particles diffusion due to charge changes in a magnetized plasma is studied. Analytical calculations and numerical simulations are employed to show that this process can be very important in the pedestal-edge-SOL regions. This is the first study that presents clear evidence of the importance of atomic processes on the diffusion of alpha particles. A simple 1D model that includes inelastic collisions with plasma species, “cold” neutrals, and partially ionized species was employed. The code, which follows the exact particle orbits and includes the effect of inelastic collisions via a Monte Carlo type random process, runs on a graphic processor unit (GPU). The analytical and numerical results show excellent agreement when a uniform background (plasma and cold species) is assumed. The simulations also show that the gradients in the density of the plasma and cold species, which are large and opposite in the edge region, produce an inward flux of alpha particles. Calculations of the alpha particles flux reaching the walls or divertor plates should include these processes.},
doi = {10.1063/1.4936875},
url = {https://www.osti.gov/biblio/22489924},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 22,
place = {United States},
year = {Tue Dec 15 00:00:00 EST 2015},
month = {Tue Dec 15 00:00:00 EST 2015}
}