ACTIVELY COOLED PUMP LIMITERS AND POWER SCRAPE-OFF LENGTH MEASUREMENTS IN TORE-SUPRA

被引:15
作者
GUILHEM, D
SEIGNEUR, A
CHAPPUIS, P
CHATELIER, M
DEMICHELIS, C
DESCHAMPS, P
GROSMAN, A
HESS, W
LECOUSTEY, P
LOARER, T
POUTCHY, L
SCHLOSSER, J
机构
[1] Association Euratom-CEA sur la Fusion Contrôlée, CEN Cadarache
关键词
D O I
10.1016/S0022-3115(06)80138-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Tore-Supra is a superconducting tokamak aimed at studying long plasma pulses (> 30 s). It is equipped with two types of pump limiters (PL). A provisional type, semi-inertially cooled between shots, has been used for plasma scrape-off characterization. The e-folding length lambda(q) for power deposition on these components has been unfolded (1.0 < lambda(q) < 2.4 cm) for different plasma parameters. On the one hand it has been found almost independent of electron density (10(19) < n(e) < 5 X 10(19) m-3), of power level up to 4 MW and of toroidal magnetic field (1.5 < B(t) < 4 T). On the other hand the strongest dependence is with plasma current (I(p)-1/2). The second type used for long pulse operation, is actively cooled during shots, its thermal constant being less than 2 s. Experiments using this ITER relevant technology are presented. Three of the actively cooled limiters have been successfully tested in a steady state regime with a surface temperature less than 1000-degrees-C (I(p) = 1.6 MA). The design value for power removal on this type of limiters has been obtained. Peak power fluxes of 10 MW/m2 (3.5 MW/m2 on average) have been estimated. This represents a breakthrough for high heat flux components since critical heat flux and burnout with subcooled flow boiling are major aspects for this kind of design.
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页码:759 / 764
页数:6
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