Experimental investigation of vapor shielding effects induced by ELM-like pulsed plasma loads using the double plasma gun device
Experimental investigation of vapor shielding effects induced by ELM-like pulsed plasma loads using the double plasma gun device
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DOI：
10.1016/j.jnucmat.2014.10.020
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发表时间：
2015-08
影响因子：
3.1
通讯作者：
I. Sakuma;Y. Kikuchi;Y. Kitagawa;Y. Asai;K. Onishi;N. Fukumoto;M. Nagata
中科院分区：
文献类型：
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作者：
I. Sakuma;Y. Kikuchi;Y. Kitagawa;Y. Asai;K. Onishi;N. Fukumoto;M. Nagata
我们已经开发了一个独特的实验装置，所谓的双等离子体枪，它由两个磁化同轴等离子体枪（MCPG）设备，以澄清蒸汽屏蔽的影响，材料侵蚀由于瞬态事件在磁约束聚变装置。由两个MCPG装置产生的两个ELM样脉冲等离子体以可变的时间差注入靶室。为了在靶材料前面产生烧蚀等离子体，将靶室中的铝箔样品暴露于由第一MCPG装置产生的脉冲等离子体。第二脉冲等离子体产生的时间延迟为70 μs。发现由量热计测量的表面吸收能量降低到没有Al箔样品的表面吸收能量的约66%。因此，在本实验中成功地证明了通过蒸气屏蔽效应来降低入射等离子体能量。
We have developed a unique experimental device of so-called double plasma gun, which consists of two magnetized coaxial plasma gun (MCPG) devices, in order to clarify effects of vapor shielding on material erosion due to transient events in magnetically confined fusion devices. Two ELM-like pulsed plasmas produced by the two MCPG devices were injected into a target chamber with a variable time difference. For generating ablated plasmas in front of a target material, an aluminum foil sample in the target chamber was exposed to a pulsed plasma produced by the 1st MCPG device. The 2nd pulsed plasma was produced with a time delay of 70 μs. It was found that a surface absorbed energy measured by a calorimeter was reduced to ∼66% of that without the Al foil sample. Thus, the reduction of the incoming plasma energy by the vapor shielding effect was successfully demonstrated in the present experiment.