Quantcast
Channel: Latest Discussions - COMSOL Forums
Viewing all articles
Browse latest Browse all 5773

E-Field inside a metal slab with a spherical void

$
0
0

So, I have two electrodes in my structure. The structure is given in the attached file. Basically, it shows a copper anode (blue) on top and a copper cathode (blue) at the bottom -- at a distance of 200 Angstroms. The bottom cathode has a spherical cavity close to the surface. Cathode is grounded and anode voltage is 10 V, yielding an "average" field of 5e8 V/m. Since the cavity is close to the cathode surface, there is a very thin "covering" of copper.

The sphere inside the copper cathode is of radius 10 angstroms and centered at (0,0,39.22) angstroms. The bottom surface of the cathode is at z = 0 angstroms and the top surface is at 54.22 angstroms. So, the center of sphere (hole) is at a depth of 39.22 A, and has a radius of 10 A ==> the top of the hole is at 49.22A. This leaves 54.22-49.22 = 5 A thin slab above the hole roughly. Process used to create spherical void/hole: I created the copper slab first, then the sphere and used the difference boolean operator to remove the sphere from the copper slab/block. (This is the correct process to create the void I hope?) In case of the space between the cathode and anode, I created another block between these and assigned its material to air.

I find no field in the cathode. I was thinking that since the "cover" above the sphere is so small (Angstrom scale), some E-field penetration could be expected even if the cathode is a metal (Copper).

I was wondering if my use of the built-in model or boundary conditions lead me to E=0 in the metal? Or is it real and the field should indeed be zero?

Also, attaching my model herewith.


Viewing all articles
Browse latest Browse all 5773

Latest Images

Trending Articles



Latest Images

<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>