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Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Let's see, if your accelerating voltage is a MV or so, and your beam power is to be a few kW, then your ion source has to produce a few mA. Assuming you're talking about H or D ions, something like this would seem to be in order:
And that thing looks like an expensive, power hungry gadget.
Unfortunately I don't know very much about ion source design. It may be possible to build your own, but extracting a high brightness beam of several mA through a tiny aperture (apparently so as to minimize the gas load on the vacuum system) while at the same time managing the heat generated (that thing is liquid cooled), etc., seems like qute a challenge.
Registered Member #1721
Joined: Sat Sept 27 2008, 08:44PM
Location:
Posts: 136
Hello:
Just FYI there are some folks at the Fusor.net site who have been working with and developing small ion sources. It tuns out that by going to the microwave part of the spectrum, and then reducing the quartz ion bottle diameter, you can get up to 2ma of ion beam current with only 70 watts of microwaves. This idea is being copied like crazy in physics labs all across the world. This is for ion sources what HF was to HV power supplies.
I would not want to be an investor is the companies that make these huge power hungry sources. To be fair the same company HVE, which makes the pictured power hungry duo-plasmatron source, also makes a 2ma RF source which does the same thing at about 700 watts. The microwave driven ones are still the best ticket today. What has driven the quest for smaller efficient ion sources in part is the need for portable neutron, and gamma accelerator sources for security applications.
If you are interested go to fusor.net, and search the threads on ion sources, some of these folks are amazing!!! Many are also members of this forum :)
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
I took a look at the forums at fusor.net, and yes, I see some impressive work going on there.
One of the first places I look when I'm investigating some technology not very familiar to me, is the U.S. patent office. Upon doing that, I see microwave and RF based ion source patents going back 30 to 40 years, at least. Take a look at patent #3778656, for example.
Another place I always look is the "The Review of Scientific Instruments"; this journal always seems to have lots of good stuff.
I agree that for your purposes, it seems like an RF or microwave source would be better (and certainly simpler) than a "duoplasmatron", but these things must have something good going for them as they are still around despite 40 year old patents on RF/microwave ion sources.
BTW, here's a link to a relatively new technology for a pulsed ion accelerator...maybe something you'd find interesting:
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750 KV CW Accelerator Example / Finding Corona Rings?
