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Registered Member #1591
Joined: Wed Jul 16 2008, 06:34PM
Location: Livermore Ca
Posts: 14
Most of my parts come from the junk pile at work or from stuff I have collected over the years. The pyrex tubes are left over from several plasma experiments I conducted in 2006. The diffusion pump came from a fusor I built in 2003. I have a ton of ss flanges and vacuum stuff from several retired Denton sputter/coater machines I picked up for free. Copper tubing is on hand due to a large Tesla magnifier I built in 2006 and later cannabalized. So far the only out-of-pocket expense has been for the brass stock I used for the drift tubes (about $30) and for some small nuts and bolts ( $5.00).
The VanDeGraff will definitely cost some bucks. Estimated at between $500-700.
The gas handling system has yet to be designed. The manifold that was(and still is) part of the old fusor is not compatible. I will have to purchase some ss capillary tubing and related hardware that will probably be about $100.
I work slow so the cost will be spread out over some time. (I really dont expect to be done with this until next year.)
So, I suppose if I had nothing and had to buy everything new, the cost would be at least $2500. Probably more. I would imagine my pumps (Varian diffusion and Ritchie Yellowjacket 2 stage) would be quite expensive if bought new.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Regarding the 'gun',
since you're going to be experimenting with different seals etc. I wouldn't use the crt gun because if /when air leaks in your filament will burn (of course you know that and will be careful etc.) and a replacement may be difficult/expensive. Scratch-building using for example filament lamp elements would provide a cheaply replaceable option.
Very nice work. Appears to be good electrostatic grading.
You might enjoy reading about a similar project in C.L. Stong's "Book of Projects for the Amateur Scientist", circa 1969. He details the cautions for high energy X-rays when running at 300 kV and up.
If you ever get to Wisconsin, I have a 500 kV Van de Graaff in house that we use for demos. External excitation at 7 kV DC and 1 mA. Nice fat 28" sparks in winter time. 30" dia. sphere. Also have a 40" dia. sphere for a larger project.
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Particle Accelerator - Stage One
