本发明另包括多个放电空间位于双挡墙结构间。
The invention includes several discharge space located between the double block wall structure.
通过在基片的下方放置磁铁，在放电空间中引入了纵向的磁场梯度。
A longitudinal gradient magnetic field was introduced into the discharge space by placing a permanent magnet under the substrate.
此外，该网罩式衬垫料形成有多个孔洞，该孔洞 将该放电空间分割成多个有限范围的放电空间。
In addition, the mesh-cover underlay is formed with plural holes, which divide the discharge space into plural limited-range discharge spaces.
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