INFLUENCE OF MHD EFFECTS AND EDGE CONDITIONS ON ITER HELIUM ASH ACCUMULATION AND SUSTAINED IGNITION

被引:16
作者
REDI, MH
COHEN, SA
机构
[1] Princeton Plasma Physics Laboratory, Princeton, NJ 08543
关键词
D O I
10.1016/0022-3115(90)90057-T
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Dilution of reacting species by build-up of helium ash and its effect on ignition in the ITER tokamak have been studied in a series of simulations with the one-dimensional BALDUR transport code. Thermal diffusivities, obtained from ITER scaling laws and with radial variations observed in JET, gave tau-E almost-equal-to 2-4 s. Refuelling of deuterium and tritium maintained constant electron density, while carbon recycling was 100% and the helium ash recycling was varied from 1.0 to 0.5. Including MHD effects, specifically sawteeth and beta limits, we find that ignition can be sustained for 200 s with R(helium) = 0.95. These simulations, the only non-zero-dimensional, time-dependent simulations thus far made for ITER plasmas, emphasize that edge plasma conditions, MHD behavior, and helium particle transport are critical synergistic issues for sustained ignition.
引用
收藏
页码:262 / 267
页数:6
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