Two-dimensional kinetic modeling of a tokamak scrape-off layer with recycling

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870621· OSTI ID:7295763

Helander, P; Catto, P J ^[1]

---

1. Plasma Fusion Center, Massachusetts Institute of Technology, 167 Albany Street, Cambridge, Massachusetts 02139 (United States)

The two-dimensional kinetic model of the scrape-off layer recently suggested by Catto and Hazeltine [Phys. Plasmas [bold 1], 1882 (1994)] is extended by allowing for ion recycling at the limiter or divertor plates by an effective ion reflection coefficient. The model describes the balance between radial diffusion and streaming along the magnetic field, and the structure of the resulting scrape-off layer is found to depend on the reflection coefficient. The particle and heat loads on the limiter or divertor plates are calculated, as well as the boundary conditions on the density and temperature gradients of the core plasma. By assuming that electrons have a Maxwell--Boltzmann distribution, the radial variation of the plasma potential is determined, and the potential of the Debye sheaths formed at the limiter or divertor plates is estimated.

• DOE Contract Number: FG02-91ER54109
• OSTI ID: 7295763
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:7; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330 -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
BOUNDARY CONDITIONS
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
DIFFUSION
DIVERTORS
ELECTRIC POTENTIAL
EQUATIONS
KINETIC EQUATIONS
LAYERS
LIMITERS
PLASMA POTENTIAL
PLASMA SCRAPE-OFF LAYER
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
WALL EFFECTS