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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
mikeselectricstuff wrote ...
I wonder how much effect a magnetic field could have on electrons which are effectively trapped in a solid - do they have any degree of freedom to move under the influence of the magnetic field? By the time any significant current starts flowing, perhaps the electrons have already found their pathway through the plastic, and so not be very vulnerable to magnetic fields. Perhaps an external electrostatic field might have more of an effect? What if you put two irradiated blocks next to each other and discharged one of them?
That's really a good question - one that currently does not appear to have an answer. Assuming that the avalanche process at the tips of the discharge involve liberated higher energy electrons, we suspect that there should be an effect, but it may require a magnetic field considerably stronger than we can create using an iron-core lab electromagnet (~18 kG). Hopefuly, we'll find out in March.
Might you get a stronger field by placing a couple of big neodymium magnets either side of the block? Obviously some care would be needed to avoid them banging into the block and initiating the discharge...
Would it be possible to create a powerful pulsed field with air-cored coils for the brief moment of discharge? How high flux density could be attained with some practical amount of pulse caps?
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
Marko wrote ...
mikeselectricstuff wrote ...
I wonder how much effect a magnetic field could have on electrons which are effectively trapped in a solid - do they have any degree of freedom to move under the influence of the magnetic field? By the time any significant current starts flowing, perhaps the electrons have already found their pathway through the plastic, and so not be very vulnerable to magnetic fields. Perhaps an external electrostatic field might have more of an effect? What if you put two irradiated blocks next to each other and discharged one of them?
That's really a good question - one that currently does not appear to have an answer. Assuming that the avalanche process at the tips of the discharge involve liberated higher energy electrons, we suspect that there should be an effect, but it may require a magnetic field considerably stronger than we can create using an iron-core lab electromagnet (~18 kG). Hopefuly, we'll find out in March.
Might you get a stronger field by placing a couple of big neodymium magnets either side of the block? Obviously some care would be needed to avoid them banging into the block and initiating the discharge...
Would it be possible to create a powerful pulsed field with air-cored coils for the brief moment of discharge? How high flux density could be attained with some practical amount of pulse caps?
Marko
That's an interesting idea - to avoid timing issues, you could maybe arrange for the pulse discharge to also initiate the discharge in the plastic with a suitable electromechanical arrangement, or maybe an exploding wire type trigger - I would imagine a sudden wire vaporisation in close proximity to the edge would initiate a discharge..
I think Bert probably already has some suitable capacitors...
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Lichtenberg Figures are in March issue of Popular Science Magazine
