首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >CHARACTERISTICS OF THE SCRAPE-OFF LAYER IN DIII-D HIGH-PERFORMANCE NEGATIVE CENTRAL MAGNETIC SHEAR DISCHARGES
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CHARACTERISTICS OF THE SCRAPE-OFF LAYER IN DIII-D HIGH-PERFORMANCE NEGATIVE CENTRAL MAGNETIC SHEAR DISCHARGES

机译:DIII-D高性能负中央磁切变放电中刮除层的特征

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In this paper we present measurements of the global power and particle balance in the high-performance phase of negative central magnetic shear (NCS) discharges and compare with reference VH-mode discharges. The principal differences observed are that NCS has a much lower fraction of the total input power flowing into the boundary, less core radiation, and larger rate of stored energy increase as a fraction of total power. Scrape-off layer (SOL) temperature and divertor heat flux profiles, and radiation profiles at the midplane, are similar to VH-mode. Due to the good core particle confinement and efficient fueling by neutral beam injection (NBI), with little gas puffing, the gas load on the walls and the recycling are very low during the NCS discharges. This results in a rate of density rise relative to beam fueling at the L to H transition time which is 1/3 of the value for VH transitions, which is in turn 1/2 that for L-to-ELMing-H-mode transitions. [References: 14]
机译:在本文中,我们介绍了负中心磁切变(NCS)放电的高性能相中全局功率和颗粒平衡的测量结果,并与参考VH模式放电进行了比较。观察到的主要差异在于,NCS在流入边界的总输入功率中所占的比例要低得多,核心辐射较少,而存储能量的增加率则占总功率的一部分。刮除层(SOL)温度和偏滤器热通量分布图以及中平面处的辐射分布图类似于VH模式。由于良好的核心颗粒限制和通过中性束注入(NBI)进行的高效燃料加注,几乎没有气体喷出,因此在NCS放电过程中,壁上的气体负载和再循环非常低。相对于在L到H过渡时间的束燃料,这导致密度增加速率,这是VH过渡的值的1/3,而后者是L到ELMing-H模式过渡的值的1/2 。 [参考:14]

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