Page 226 - Fundamentals of Magnetic Thermonuclear Reactor Design

208 Fundamentals of Magnetic Thermonuclear Reactor Design

TABLE 6.8 Structure With Adsorbing Walls Optimisation Criteria
Structure to be Controlled
optimised parameters Optimisation criteria
Thermal shields for Geometrical ratios Minimum radiant beam
cryopumps transmission coefficient;
Highest attainable gas-kinetic
transmission coefficient
Surface-action Design layout; Maximum capture coefficient;
pumps geometrical ratios Minimum radiant beam
absorption coefficient;
Similarity of the pumped gas
spatial distribution function and
the sputtered (evaporated) getter
atoms
Systems containing Design layout; spatial Minimum return coefficient;
sorbing surfaces, interposition of the Maximum useful work per
sources of molecular and radiant second;
molecular and beams sources; Minimum adsorbing area;
radiant fluxes Spatial distribution Minimum radiant beam
of the molecular and absorption by adsorbing surfaces;
radiant beam densities; Minimum ‘absorbed radiant
Geometrical ratios beam/removed gas’ ratio

A joint analysis of the spatial distribution of molecular and radiant energy
flows is performed as part of a criterion analysis of gas-absorbing structures. It
is the only way to achieve a structure/parameter optimisation and improve the
energy performance of thermal shields and cryogenic pumps in general.

REFERENCES
[1] L.F. Belovodskij, V.K. Gaevoj, V.I. Grishmanovskij, (Tritium), Energoatomizdat,
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[2] A.A. Glazkov, G.L. Saksaganskiy,
(Vacuum in Electrophysical Facilities and Systems), Energoatomizdat, Moscow, (1985) pp.
1–184 (in Russian).
[3] V.A. Chuyanov (Ed.), (Tokamak Engineering
Problems), Energoatomizdat, Moscow, 1986 pp. 1–144 (in Russian).
[4] S.V. Mirnov, (Physical Processes in Tokamak
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skiy, Research into vacuum and dynamic characteristics of cryopanels for fusion reactor ultra-
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