How to emit particles on a circle

Hi,

Is how can I easily emit particles on a circle? Not on a surface, but edges of a circle.

This may not be what your looking for, in that they’re generated on a thin surface, but it may still be useful (and easy).
Add a thin cylinder to the emitter and check “SurfaceOnly”, X and Y. The height of the cylinder may be infinitesimally small, approaching a 2d circle.
Caveat: The attached photo is from a static mesh emitter in a 3d app.

Add a Velocity Cone module and set the Min and Max Distribution to 0.5.
This essentially flattens the cone into a disk.

282353-velocity-cone.png