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Hi folks,
I believe the rod is a better structure for both the domain delay line, and any capacitance that is coupled to it.
There's something just not right about the toroid structure to me.
Consider a toroid with a single pulse coil.
The cone shaped domain wall nucleates in the center of the coil and then expands in both directions through the core. There are two domain walls expanding in opposite directions. Each domain wall as it moves away from the nucleating coil will have *the same inverted conical shape*, with the points of both cones aiming at the center of the coil.
The divergence of these walls creates a rapidly diminishing diamond shaped region of remaining random flux on the opposite side of the toroid. But it appears to me that the two domain walls are somewhat 'solitonic', and to preserve both the energy stored in the domain wall rotation process, and the forward momentum, they will pass through each other at that point--??
Smudge has pointed out that surface waves travel at right angles to the iron, and in a toroid these begin at the coil and expand through the central and surrounding spaces. These waves could be synchronized with the magnetization wave inside the toroid, or could be at C, or could be instantaneous-- I don't know. According to the thesis from the naval student I sent a while back, on a toroid the surface waves arise from the coil surface and then travel at right angles to the toroid, until they merge on the other side.
I agree that Smudge should weigh in on the nature of the capacitive loading used.
High-resistance (low-loss) ferrites have a electrically controllable permeability. See attached patent, which I mentioned to Smudge a while back but couldn't find. So cleaning the ends of the ferrite rod, then soldering some leads to it, should allow reasonable amount of control of mu, but you would need a DC HV generator. The attached patent shows how to do this, although it doesn't show the voltages needed. Probably pretty high.
BaTi rods may not be available since their functions have been taken over by even higher k perovskites like LZT, but any of these should work. Long rods are not made, AFAIK. The attached datasheet for an electrostrictive sonar transducer rod is probably as good as it gets, but haven't found any LZT rod like this available on a 'buy one' basis. It would be an expensive way to go. I think the Cyril mentioned soaking the delay line in a liquid dielectric, and this seems a lot easier if Smudge's multiple shunted capacitor method doesn't work out.
Those Perovskite rods can be used for acoustic overunity devices as Wooten MRA, Hutchison's '5 Watt generator', Davidson's magneto- acoustic generator, plus various nonreciprocal transducer designs, plus ambient thermodielectric generators with high output, plus detectors of the Earth's diurnal gravitomagnetic fluctuations, etc. -- So, always a good thing to have around :-)
orthofield
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Topic: A closer look at a simulated Negative resistance coil. (Read 79913 times)
