Multilayer pebbles for application to new divertor systems
Multilayer pebbles for application to new divertor systems
复制标题
适用于新型偏滤器系统的多层卵石
DOI：
10.1088/0029-5515/40/3y/327
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发表时间：
2000
期刊：
影响因子：
3.3
通讯作者：
M. Nishikawa
中科院分区：
文献类型：
--
作者：
M. Isobe;K. Matsuhiro;Y. Ohtsuka;Y. Ueda;M. Nishikawa
提出了一种用于未来商业聚变反应堆的“卵石滴”导流器概念。该系统的显著特点是使用多层卵石，由中心核和一些涂层组成。采用多层卵石的卵石滴导流器具有稳态壁泵送和低体积氚潴留等优点。整个导流器系统的性能取决于多层卵石的特性。特别是，系统的最大热负荷是由核的尺寸、层结构和材料决定的。核在决定表面温度方面也起着重要的作用，而表面温度又影响壁泵效率。给出了导流器卵石最大允许热负荷和表面温度的数值计算结果。通过对热应力和表面温度的数值估计，发现带陶瓷核的导流卵石的半径应为0.5-1 mm。
A `pebble drop' divertor concept is proposed for future commercial fusion reactors. The marked feature of this system is the use of multilayer pebbles that consist of a central kernel and some coating layers. By using multilayer pebbles the pebble drop divertor has advantages such as steady state wall pumping with low bulk tritium retention. The performance of the whole divertor system depends on the characteristics of the multilayer pebble. In particular, the maximum heat load of the system is determined by the dimensions, the layer structure and the material of the kernel. The kernel also has an important role in determining surface temperature, which affects the wall pumping efficiency. Numerical results for the maximum allowable heat load and the surface temperature of the divertor pebble are presented. From the numerical estimation of thermal stress and surface temperature, it is found that the radius of a divertor pebble with a ceramic kernel should be 0.5-1 mm.