In reply to Michel Jullian's message of Sun, 25 May 2008 01:09:29 +0200:
Hi,
[snip]
>Oops, after a better look at the photo it seems the plasma _does_ extend
>beyond the inner electrode, at least in this "star mode", so I'll retreat to
>my previous argument, namely that the metal grid is there for a reason (maybe
>only to initiate the plasma BTW), and that it could be advantageous to replace
>it by something less substantial. No?
The two grids provide a potential difference between them that accelerates and
focuses the particle beams ("star mode" beams). Their fixed position is
responsible for the focusing effect.
[snip]
Regards,
Robin van Spaandonk
The shrub is a plant.
