Van de Graaff as a Particle Accelerator
- New to the list but a search on "accelerators" shows a few remarks
and/or comments by folks who've managed to do it. I'm contemplating
finishing an accelerator project that I started 42 years ago and
tabled until now. I only could afford a 20Kv power supply, a tube,
motor, and one set of pulleys before I gave up. In the meantime I got
a chance to work with some college kids on a 2nd generation homebrew
system built in one of the college out buildings. A tinkerer's dream
that was. I only saw it run full tilt boogie once. Otherwise we were
constantly fiddling with it. So, I have some experience in this
Today I would love to talk off list with anyone who's managed to
accomplish particle acceleration. I'm envisioning a machine with a
16" dia X 24" terminal that sits inside a tank filled with compressed
nitrogen and achieve a beam voltage near 1MeV. I figure I will need
to build a few prtotypes but the idea is a vertical machine about 40"
tall with a stack of equipotential rings that split voltage down the
column using HV resistors. Each ring attaches to an acceleration tube
terminal. The tube is a stack of aluminum disks and glass cylinders
built using Apezion (sp?) adhesive and attached to a high vacuum
system built off ebay parts. The disks focus the beam by creating
electric fields between the different potentials. The proton source
is cribbed from SciAm (RF from an old auto induction coil).
There is a lot I have yet to figure out, and I'm certain it's a sign
of my age, but what the hell?
Anyone willing to chat? I would welcome and appreciate your insight.