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Mr. Fusion
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Amateur Ion Gun Design
January 13, 2003 — 17:19

Well, the fusor.net forum is really
heating up (remember, I’m a geek, so scale "heating up" accordingly).  Phil
Fostini started off the

discussion
by making a wonderfully generous offer of an ion gun to those
that helped him design them from the parts he was making available. 
Garrett Young and Phil are busily designing their first version.  I think
the entire process is pretty cool.  A while ago Garrett was pushing for a
more distributed fusor equivalent to ITER – amateurs colluding with each other
to share knowledge and resources in this amateur research.  So far, people
seem to be responding.  <heh>

From what I can tell, though, the first version will likely work.  The
design, however will need some focusing electrodes I think.  I did some
quick sketches in CPO-3D and it’s clear that of the ions created, most will hit
the BeO insulator – assuming a point ion source with momentum directed in a cone
towards the accelerating electrode.  I’m not sure, but the accelerating
electrode may quickly become a decelerating electrode.  I’m also thinking that the electric
field from the fusor cathode may not have much effect through the BeO
insulator with a small hole down the center.  I’ve been trying to model
this with CPO-3D, but I haven’t had much time to do so.  I’ll try some more
tonight. 

It could well be that the BeO insulator will block the decelerating effect of
the accelerating electrode (i.e. once past the electrode, the ions will be
re-attracted back towards the now decelerating electrode).  So the scheme
might actually work.  I do think that unless focused in some way, it’ll be
hard to get more than a small percentage of the generated ions to go down the
hole in the BeO insulator.  But even if they only get 10% of the ions, it
will still be very cool.

And lord knows the second version of the ion gun will be far, far better. 
:)

<heh> I just love this stuff.

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