Fueling characteristics of supersonic gas puffing applied to large high-temperature plasmas in the Large Helical Device
Fueling characteristics of supersonic gas puffing applied to large high-temperature plasmas in the Large Helical Device
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DOI：
10.1088/0741-3335/54/5/055006
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发表时间：
2012-05
影响因子：
2.2
通讯作者：
A. Murakami;J. Miyazawa;C. Suzuki;I. Yamada;T. Morisaki;R. Sakamoto;H. Yamada
中科院分区：
文献类型：
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作者：
A. Murakami;J. Miyazawa;C. Suzuki;I. Yamada;T. Morisaki;R. Sakamoto;H. Yamada
利用带有拉瓦尔喷嘴的快速电磁阀喷射高压气体的超音速喷气技术（SSGP），在大型螺旋装置上研究了其在高温等离子体中的燃料加注特性。SSGP的加料效率取决于靶等离子体密度，并随着密度的增加而降低。这是由于SSGP的燃料机制，其中燃料颗粒被供应到等离子体边缘区域，然后通过扩散被输送到核心区域。SSGP在毫秒级的短时间内局部地向边缘区域提供大量粒子。在初始密度为1.5 × 1019 m−3的情况下，SSGP的燃料效率可达20%以上，比相同密度下的普通喷气燃料效率高出一倍以上。此外，这一性质导致边缘冷却的SSGP，这将是有益的偏滤器热负荷降低的附加效果。
Supersonic gas puffing (SSGP), where a high-pressure gas is ejected through a fast solenoid valve equipped with a Laval nozzle, has been applied to large high-temperature plasmas and its fueling characteristics have been investigated in the Large Helical Device. The fueling efficiency of SSGP depends on the target plasma density and decreases as the density increases. This is due to the fueling mechanism of SSGP, where the fuel particles are supplied to the plasma edge region and then transported to the core region by diffusion. SSGP locally supplies a large number of particles to the edge region within a short time on the order of milliseconds. A fueling efficiency of ∼20% can be achieved by SSGP at a low initial density of ∼1.5 × 1019 m−3, which is more than twice as high as that of ordinary gas puffing at a similar density. Furthermore, this property leads to the additional effect of edge cooling to SSGP that will be beneficial for divertor heat load reduction.