Plasma meets with Kapton surface

Dielectric barrier discharges are a type of AC plasmas aiming to limit current in time to prevent spark formation. The dielectric layer holds charges, instead of letting them flow as in conductive materials. The constant exposure to plasma species causes wear/deformation on the surface. Here I show an example of Kapton layer.

 

1 is where the dielectric breakdown occurs. 1 and 2 are the surfaces where plasma extends. 3 and 4 are less exposed to plasma extension. No plasma touches to 5.

1-highly damaged area: craters and slits
2-damaged area:holes and radial slits
3-radial slits
4-larger fracture
5-untouched area:little craters

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