From: "Sir Charles W. Shults III"
References: <3D8B60B3.1090107@BOGUS.earthlink.net> <3D8CB57B.6040800@BOGUS.earthlink.net> <3D8CF776.204@BOGUS.earthlink.net> <firstname.lastname@example.org> <3D8D181E.4060504@BOGUS.earthlink.net>
Subject: Re: Home brew linear accelerator?
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Sun, 22 Sep 2002 02:35:08 GMT
NNTP-Posting-Date: Sat, 21 Sep 2002 22:35:08 EDT
Organization: RoadRunner - Central Florida
Another thought is to use a proton conductor to introduce them. However,
nothing so exotic is needed. Consider how any light ion accelerator works.
First, a plasma is developed from some material, such as hydrogen gas. This
plasma is created by passing high voltages through the material. The electrons
are drawn to a charged plate and the positive ions (protons, in this case) are
drawn toward a negatively charged plate with a hole in it. The protons are
focused and shot past a magnet, where they deflect by a known amount. Anything
that makes that turn must, by definition, be a proton.
This is where you introduce them into the center of the cyclotron. A hollow
waveguide carries the protons into the center and injects them where they
"orbit" inside the dees just as electrons would, but they are much more massive
and so they will require a different RF signal to remain in the circuit.
Too fast, and the protons are expelled in random direction in every widening
orbits. To slow, and they oscillate back and forth. The speed of the protons
is controlled by the charges leading to the injector, and then by the frequency
of the RF in the dees.
Now, if you pursue the proton conductor idea, you can dispense with the
plasma stage, which has possibilities because now high voltages can do the
tricks that required vacuum and a plasma source. This makes the design much
more compact, at least in theory. Certain ceramics are pretty good proton
conductors, such as doped perovskites. Oddly, so is water ice.
It seems to me that a good, pure palladium electrode might also function
nicely as a hydrogen pump and high voltage could do the trick from there. Then
you would never even break vacuum.
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip