A Molecular Dynamics Study on the Dust-Plasma/Wall Interactions in the EAST Tokamak
A Molecular Dynamics Study on the Dust-Plasma/Wall Interactions in the EAST Tokamak
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DOI：
10.1088/1009-0630/15/4/03
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发表时间：
2013-04
影响因子：
1.7
通讯作者：
Hong Rongjie;Yang Zhongshi;Niu Guojian;L. Guangnan
中科院分区：
文献类型：
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作者：
Hong Rongjie;Yang Zhongshi;Niu Guojian;L. Guangnan
利用分子动力学程序模拟了EAST托卡马克装置不同位置处W纳米尘埃与氘等离子体的相互作用。结果表明，半径为Rd ~5 nm的纳米尘埃粒子在离子的相互作用下可以在托卡马克边缘等离子体的某些特定位置存在至少几纳秒而不被烧蚀，而Rd ≥25 nm的纳米尘埃粒子在等离子体温度T~ 50 eV和密度n~1019 m−3时可以被烧蚀。此外，还模拟了钨纳米颗粒在100 m/s和1000 m/s撞击速度下与钨壁的碰撞过程。结果表明，尘埃颗粒会粘附在壁面上，碰撞不会对壁面造成实质性破坏，但根据尘埃颗粒的入射速度，可能会对尘埃颗粒本身造成部分破坏。
The interactions between the W nano-dust and deuterium plasma at different locations of the EAST tokamak are simulated using a molecular dynamics code. It is shown that nano-dust particles, with the radius, Rd, ~5 nm, can exist for at least several nano-seconds under the interactions from the ions without being ablated in some specific places of the tokamak edge plasma, while those with Rd ≥25 nm may be ablated if the plasma temperature T~ 50 eV and density n~1019 m−3. In addition, the collisions of tungsten nano-dust grains with a tungsten wall at 100 m/s or 1000 m/s impinging speeds are simulated. It is demonstrated that the dust will stick to the wall, and the collision will not cause substantial damage to the wall, but it may be able to cause partial destruction of the dust grains themselves depending on their incident speeds.