HYDROGEN RECYCLING COEFFICIENT IN BERYLLIUM - EXPERIMENTAL-DETERMINATION AND A TEST SIMULATION OF THE DENSITY EVOLUTION IN A JET PLASMA DISCHARGE

被引:18
作者
SAIBENE, G
SARTORI, R
TANGA, A
PEACOCK, A
PICK, M
GAZE, P
机构
[1] JET Joint Undertaking, Abingdon
关键词
D O I
10.1016/0022-3115(90)90116-5
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The aim of this work is to provide experimental data on the recycling of hydrogen isotopes in beryllium. The ratio D/2K(r)[m-2] (D: diffusion coefficient, K(r): recombination rate coefficient), which characterises the hydrogen transient pumping behaviour of the material, has been measured for hydrogen and deuterium in Be as a function of temperature, in the range 373 less-than-or-equal-to T[K] less-than-or-equal-to 553. D/2K(r) was found to be congruent-to 10(20) m-2 and depend weakly on the Be temperature (activation energies of congruent-to 0.1 eV). This value of D/2K(r) was then used as an input parameter to the PERI code to simulate the plasma deuterium inventory behaviour assuming that the main processes governing the recycling during the discharge are diffusion in the bulk and recombination on the surface of beryllium. The deuterium fluxes from the plasma-facing surfaces are simulated with good accuracy. The simulation of the deuterium plasma inventory is somewhat worse, although a satisfactory agreement between the calculated and experimental time evolution is achieved.
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页码:618 / 623
页数:6
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