Steady state wall pumping performance of pebble drop divertor
Steady state wall pumping performance of pebble drop divertor
复制标题
卵石滴偏滤器的稳态壁泵送性能
DOI：
10.1016/s0022-3115(98)00380-8
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发表时间：
1998
影响因子：
3.1
通讯作者：
M. Nishikawa
中科院分区：
文献类型：
--
作者：
M. Isobe;Y. Ohtsuka;Y. Ueda;M. Nishikawa
提出了未来聚变反应堆的球滴偏滤器概念。通过使用多层涂覆的卵石，该系统可以预期提供燃料气体泵送功能。本文对球滴偏滤器的抽运性能进行了估算。利用氢原子在石墨表面的质量平衡方程，计算了偏滤器辐照时氢原子在卵石表面层的瞬态行为。计算中假设入射氢通量为1× 1023 atoms/m2 s（1.5keV），入射热通量为35 MW/m2，撞击区宽度为5cm。用TRIM程序计算了1.5keV氢原子和离子诱导的脱陷截面的射程分布。计算结果表明，采用具有石墨表层和BeO内核的小球的球滴偏滤器可以以4.3×1022 - 2.2× 1023 atoms/s的速率从ITER聚变堆中泵出氢。
A pebble drop divertor concept is proposed for future fusion reactor. By using multi-layer coated pebbles, this system can be expected to provide the fuel gas pumping function. In this paper, the pumping performance of the pebble drop divertor is estimated. The transient behavior of hydrogen retained in the surface layer of pebbles in divertor irradiation is calculated using a mass balance equation of hydrogen atoms in the graphite surface. In this calculation, the incident hydrogen flux of 1×1023atoms/m2s (1.5 keV) and the heat flux of 35 MW/m2, and the width of strike zone of 5 cm are assumed. Range distribution of 1.5 keV hydrogen and ion-induced detrapping cross-section is calculated by TRIM code. From the calculated dynamic hydrogen retention, it is shown that the pebble drop divertor using the pebble with graphite surface layer and BeO kernel can pump out hydrogen by 4.3×1022−2.2×1023atoms/s from the ITER scale fusion reactor.