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Registered Member #118
Joined: Fri Feb 10 2006, 05:35AM
Location: Woodridge, Illinois, USA
Posts: 72
Marko wrote ...
Thanks a lot for this post, this is an extremely interesting process to see. I hope you guys watch not to get yourselves irradiated, I would be scared to get anywhere close to that building myself.
You made me remember a segment from mythbusters where they sent some food for irradiation - they seemingly used focused electron beams and no apparent shielding from generated Xrays - I thought the beams looked very cool as they ionized air on their path, but did the camera-man get cooked in the process without knowing it? I expected to see your beam ionizing air as well, is it just to diffuse for the effect to be observable?
By the way, could you once make a footage of a glass mirror actually turning black? I'd really like to see that
Regards,
Marko
We wear radiation dosimeters "just in case". We use relatively low beam currents (10's of mA), so air ionization is not as obvious as it is with higher currents or in pulsed systems. At high beam currents, the beam is quite obvious - such as this pulsed accelerator, where the beam looks similar to a rocket engine test:
Any common glass irradiated by the beam turns a dark brown or even a black color (over time). We are going to run some quartz crystals (possibly with some lead masking) during our next run. We generally stay away from irradiating thicker glass specimens since they tend to shatter when discharged. Although most shatter immediately, those that don't are especially dangerous - they tend to unexpectedly shatter, sometimes just from the thermal stresses induced from holding one.
Registered Member #350
Joined: Mon Mar 27 2006, 05:14PM
Location:
Posts: 106
Is it possible to make something like that without a particle accelerator? Maybe just a small one? How about if you use liquid plastic and then build it up layer by layer. So you first make a thin layer of plastic, let it cool and charge it a little. Then put a second layer on top of that, charge it some more and so on.
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Two video clips about making Lichtenberg Figures on YouTube
