Motion of unipolar arc spots ignited on a nanostructured tungsten surface
Motion of unipolar arc spots ignited on a nanostructured tungsten surface
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DOI：
10.1088/0741-3335/53/7/074002
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发表时间：
2011-07
影响因子：
2.2
通讯作者：
S. Kajita;S. Takamura;N. Ohno
中科院分区：
文献类型：
--
作者：
S. Kajita;S. Takamura;N. Ohno
Unipolar arc is a unique phenomenon, which many people have been trying to investigate experimentally and theoretically. In this paper, we show that unipolar arcing is promptly initiated on tungsten in response to a pulsed heat load when a nanostructure is formed on the surface by exposure to a helium plasma. The behavior of the arc spot is investigated from the observation with a fast framing camera and from the arc trail recorded on the material, and comparisons are made between the observation and numerical modeling. It is revealed that the arc trail has a self-affine fractal nature under magnetized conditions, and it significantly alters with the magnetic field strength.
