Particle deflectors

Hi!

Im am trying to simulate a “snow dome”-like effect with particles. my only problem is the deflector, which doesn’t seem to work in my case. The outside of a sphere does deflect particles right away… but what’s about the inside?

I was trying to simply put a big sphere over my particle-scene, which did not work. Then I tried a boolean differenced hollow sphere, which also did not work…

Suggestions are warmly welcomed!

LeFish