Electric field map for field cage

[chandrabhan_1]

Hi,

I am trying to calculate the electric field map to check the uniformity of the drift field of the gas detector having a cathode, field rings, and anode.

For mesh, I import the CAD drawing of the detector with two flanges and a cathode, field rings, and anode.
There are around 12 field rings separated by 15 mm, so the separation between the cathode and anode is around 195 mm.

I am able to obtain a potential map (screenshot attached) but the electric field is not coming properly. Another thing how to defined gas volume/air volume when importing 3D CAD in Gmsh?

I would appreciate your suggestions.

Thanks,

[kevinarden]

Generally you include the mesh of the air or gas like in tutorial 12 and 14
https://www.nic.funet.fi/pub/sci/physic ... orials.pdf

This is usually done by creating a large box or sphere, placing your geometry inside it, and use partition to cut your part out of the air.
like in Chapter 9
https://www.nic.funet.fi/pub/sci/physic ... dElmer.pdf