Simulation of neutral atoms and molecules in an international thermonuclear experimental reactor high-pressure (1-Torr) ultrahigh recycling divertor

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Fusion Technology

OSTI ID:466358

Hayden, D B; Ruzic, D N ^[1]

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1. Univ. of Illinois, Urbana, IL (United States)

The Monte Carlo code DEGAS was used to investigate the neutral atom and molecular interactions for a high-pressure ({approx}1-Torr) gaseous divertor in the International Thermonuclear Experimental Reactor (ITER). Energy is removed from the plasma by radiation while the plasma pressure is balanced predominantly by a high neutral pressure at the end of the divertor. Plasma parameters were taken from the two-dimensional fluid code PLANET. Neutral sources from both ions recycling off the walls and recombination were included. The neutral density peak calculated with DEGAS of 3.43 {+-} 0.01 x 10{sup 22} m{sup -3} occurred 4.5 cm from the divertor channel end. The ion and neutral atom energy fluxes were calculated to determine the heat load onto the divertor walls. A code was written to calculate the radiation distribution onto the side walls, not including any radiative absorption or reemission. The total energy flux peak (including ions, neutrals, and radiation) was 4.28 {+-} 0.30 MW/m{sup 2}. This falls below the design criteria of 5 MW/m{sup 2}. These results may help determine the wall material, heat removal, and the vacuum pumping requirements for the ITER divertor design and show the importance of a full treatment of neutral atoms and molecules in these regimes. 12 refs., 11 figs.

• DOE Contract Number: FG02-89ER52159
• OSTI ID: 466358
• Journal Information: Fusion Technology, Journal Name: Fusion Technology Journal Issue: 2 Vol. 31; ISSN 0748-1896; ISSN FUSTE8
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
99 GENERAL AND MISCELLANEOUS
ATOMS
D CODES
DESIGN
DIVERTORS
ELECTRON DENSITY
ELECTRON TEMPERATURE
ENERGY TRANSFER
ITER TOKAMAK
MOLECULES
MONTE CARLO METHOD
NEUTRAL PARTICLES
P CODES
PLASMA DENSITY
RECOMBINATION
RECYCLING
SIMULATION
WALL EFFECTS