Joseph Chikva wrote:ladajo wrote:In the cae of Polywell, once the electrons are inside the shell, why do we care if the beam is destoyed?The second quote is the answer on the first your question. Bunching of electron beams means that six electron beams do not intersect each other in the center. And may be you will not have the core (or waffleball) in the center. And even all will not develop according this catastrophic scenario, instability will not allow you to reach high beta.ladajo wrote:We only want them to join the general populace of the potential well
Destroyed beam (if destroyed) will be splitted on separate bunches and all of them will be the low depth potential wells for ions instead of one and deep well as desired.
I don't think this is the case. Once an electron is inside the device, it becomes more and more governed by the group behavior with every collision, and the fact it entered on a beam becomes less and less relevant. In my mind, I think that you want to dial back the beam until you get sufficient energy to enter, but not so much that you drive the beam to any significant distance across the volume. The less the better. Otherwise, you risk increasing losses, as you in effect, drive the electrons out the other side.
I am still toying in my head with a means to 'bleed' electrons into the inside volume without providing a ground path, and possibly using the leakage exit routes as a possible entry route. Say for example, bleeding electrons directly from a point on the magrid casing to get picked up by a field line, and the letting the electron spiral up and out into the device, instead of sprialing down and in... or seeking to use the same effect at a cusp.