Plasma Surface Interaction Characterize of New Type Multi-elements Doped Carbon-Base Materials

Z.-y. Xu (Sp), X. Liu, J. Chen, M. Wang, J. Song, G. Zhai, C. Li, Southwestern Institute of Physics, Chengdu, Sichuan (China) 
Low Z materials, such as Carbon-base materials, Be, is major plasma facing material (PFM) for current, even in future fusion device. In this paper, several new type multi-elements doped carbon-base materials developed is presented, and their properties experimental results are also given. Using 3KeV D+ irradiated specimens under dose rate at 4.6x1015 D+ cm-2s-1 and rising up temperature during D+ irradiating, measured CD4 gas partial pressure at the same time. After using 2.5keV H+ irradiated specimens and the fluence up 1.2x1017 H+ ions cm-2, rising temperature up, measured CH4 gas partial pressure at the same time. Using Laser beam, beam size 4mm and 7.2mm in diameter, duration 4ms, frequency 10Hz, average power 200W, total irradiation time 5 to 30s, or, power density on surface of specimens is 122.9MWm-2 and 398.1MWm-2, measured thermal shock strength 0.78 KJ cm-2.S-1/2 and 2.52 KJ cm-2.S-1/2. Using 2.5keV H+ irradiated specimens and the fluence up 2x1018 H+ ions cm-2 at different temperatures, measured the specimens weight changed before and after irradiation. Locating specimens in HL-1M Tokamak, where is 1cm closer to main plasma than that of limiter is, during the exposure, specimens were turn over for the specimen surface keeping to electron side and to ions side in half a total time. After about 100 times charged, specimens were taken off to analyze. The results are indicated that the chemical sputtering yield decrease one order magnitude, thermal shock resistance, radiation enhance sublimate decrease, temperature desorption spectrum evidently lower and synthesis properties of exposing to plasma and so on.

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