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以数值计算法计算了第一壁冷却剂泄漏氦杂质在等离子体中的分布,氦分布的峰值在SOL(Scrape-ofLayer)区。当要求等离子体中心的氦浓度小于5%时,允许的最大泄漏率Nmax约为0.35×10-3Mol/s,允许的最大裂纹尺寸长约为3.1mm,宽约为0.63mm。影响杂质分布和浓度的主要因素有壁温、等离子体边缘温度、密度和SOL区的温度密度长度。壁温越低、等离子体边缘温度越低、密度越高、温度和密度长度越大,则中心杂质浓度越小,且杂质分布峰值越接近第一壁。 相似文献
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Planar emissive probe is studied for the first time using a massively parallel particle‐in‐cell code BIT1 [22]. The probe is immersed in a plasma similar to edge plasmas of mid‐sized tokamaks. Dependence of the floating potential on electron emission from the probe is studied. With increasing emission the floating potential increases, but then saturates ~2Te below the actual plasma potential (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Shohei Yamoto Kazuo Hoshino Yuki Homma Tomohide Nakano Nobuhiko Hayashi 《等离子体物理论文集》2020,60(5-6):e201900146
In order to study the potential impurity seeding operation regime of the future fusion devices, the first application of the integrated divertor code SONIC to the Ar + Ne mixed-impurity seeding operation of JT-60SA steady-state high-β plasma has been carried out. In the case, Ne is added to Ar-only seeding, the separatrix electron density has fell into the desired low separatrix electron density of the scenario. This is mainly because the D+ flow velocity towards the inner divertor has been increased by the Ne seeding. The resultant friction force transports Ar impurities towards the inner divertor region, while impurities are stagnated in the top of scrape-off layer (SOL) in the Ar-only seeding case. The higher impurity radiation power in the divertor regions and lower one in the SOL region above the X point have been obtained in mixed-impurity seeding cases, which show similar tendency as the Ar + Ne mixed-impurity seeding experiment in JT-60 U. At the core edge, Zeff has been slightly increased and the radiation power has been decreased as the Ne seeding rate increases. The core plasma/impurity transport has been also evaluated by the TOPICS code using the impurity density at the core edge computed by the SONIC as a boundary parameter. The results show lower Zeff and radiation power, and higher electron temperature in the core in the mixed-impurity seeding cases. Above possible contributors to the better energy confinement indicate that the mixed-impurity seeding operation might be more effective than Ar-only seeding operation. 相似文献
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