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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
3l3ctrici7y wrote ...
borri317, have you considered using an ignition coil? They're extremely easy to run directly off of the mains, and when doing so, produce significant output. As has been stated before, you do not need to rectify the power to the xray tube, as it will self rectify (that is what it is after all, an ultra high voltage rectifier)
I've not personally tried this, but it seems reasonable that it could work.
See this youtube video...
This may sound OK in principle, but if the anode (or just the anode spot) becomes overheated for any reason, and so become a thermionic emitter, the tube may suffer from strike-back (as it is called) - conduct backwards on the negative half-cycle - which will rapidly destroy it.
Gas diode suppressors like the Kearsley circuit are sometimes used to reduce the possibility of unwanted conduction on the negative half cycle.
When a sinusoidal voltage is applied to an X-ray tube then the maximum photon energy can only be about 60% of the tube voltage, and as the cycle declines, undesirable (dangerous!) low energy photons will be in the majority. (Compare this with the continuous 76% maximum photon energy of a constant potential anode supply.)
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electricity for x ray tube
