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Registered Member #3304
Joined: Mon Oct 11 2010, 04:18AM
Location:
Posts: 9
I saw a thread on this site that was discussing a cyclotron project. I'm in the process of building a similar instrument, but with a different approach. The effort is directed toward the use of permanent magnets and a vast reduction of overall size. The materials for construction are common and need only basic hand tools. I'm calling the device a micro-cyclotron (uC).
The project has gone smoothly so far, except for the magnet/yoke assembly. These NIB N50 magnets are death-defying to work with. Once the magnets are coerced into the yoke, though, they become tame and just sit there and do their job.
I'm now working on the ion source which will be made from a 'grain of wheat' type of light bulb with the glass envelope removed.
More detailed information can be seen on the Fusor open forum:
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Welcome to 4HV George!
The X-ray tube division of Svetlana in St Petersburg, Russia, manufacture a small betatron tube.
The Svetlana device has now been incorporated into a range of portable X-ray betatrons from 2.5MeV to 7.5MeV by the British firm JME.
"A report [below link] describes characteristics and parameters of small-size pulse betatrons developed by Research Institute of Introscopy at Tomsk Polytechnic University. They are used as sources of X-ray radiation but have much higher radiation energy compared to X-ray devices, and are not widely known."
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
They are for inspecting critical welds in huge, thick steel things, like gas pipelines and nuclear reactors. And for checking the quality of reinforced concrete, etc.
The pictures on the JME site show them X-raying the shaft of a big steam turbine to check for cracks.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Grenadier wrote ...
That betatron tube is awesome, but why would anyone need a portable 7.5MeV x-ray source?
Mostly in industrial X-ray inspection systems, for detecting and imaging cracks, voids, faults, in dense and/or massive structures - anything from ship's propellor drive shafts, to oil pipelines, military armoured structures, railway tracks, and the blocks of reinforced concrete in the wall of a dam.
Edit: spent so long answering this that Steve has already done so, so I'll beef it up with a pic of Donald W. Kerst and his betatron-type cyclotron of 1940, which was a table top device - a manageable size for the home constructor.
In the pic below, Kerst is shown meditating on his table-top betatron at the University of Illinois, with its very much more powerful descendent behind him.
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Micro-cyclotron
