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Symmetry Solutions
Posted: 16 July 2011 07:02 PM   [ Ignore ]   [ # 16 ]
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markus7 - 16 July 2011 03:10 PM

Could you explain what you mean by “add a slight inductance at the base of the main electrodes”?

“Inductance is the property of an electrical circuit causing voltage to be generated proportional to the rate of change in current in a circuit.”

A current divided in N paths may not divide evenly if the paths are not symmetrical. However, by adding an equal impedance to each path, the current will divide more evenly. An series inductance is an impedance at high frequencies. This is a bad idea for the main cathodes for the reason stated by the previous poster- for a maximum current per voltage the cathode inductance should be reduced.

However, if it is desired to use the tungsten pins instead of the knife edge, it might help to add inductance to the pins. The main current is through the main cathodes, not the pins, so decreasing pin current would not be as bad. Inductance in the pin effectively filters out the higher frequences of current change through the pin, so that it would take time for a current path to build up from the first firing pin to the anode, and by then the current might have started from the other pins. The inductance of each pin could be increased by bending it into a spiral.

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Posted: 16 July 2011 07:20 PM   [ Ignore ]   [ # 17 ]
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TimS - 16 July 2011 07:02 PM
markus7 - 16 July 2011 03:10 PM

Could you explain what you mean by “add a slight inductance at the base of the main electrodes”?

“Inductance is the property of an electrical circuit causing voltage to be generated proportional to the rate of change in current in a circuit.”

A current divided in N paths may not divide evenly if the paths are not symmetrical. However, by adding an equal impedance to each path, the current will divide more evenly. An series inductance is an impedance at high frequencies. This is a bad idea for the main cathodes for the reason stated by the previous poster- for a maximum current per voltage the cathode inductance should be reduced.

However, if it is desired to use the tungsten pins instead of the knife edge, it might help to add inductance to the pins. The main current is through the main cathodes, not the pins, so decreasing pin current would not be as bad. Inductance in the pin effectively filters out the higher frequences of current change through the pin, so that it would take time for a current path to build up from the first firing pin to the anode, and by then the current might have started from the other pins. The inductance of each pin could be increased by bending it into a spiral.

Oh yes. I see. Even if a fair number of turns had to be added, it sounds like an idea worth exploring. It is not difficult to imagine, say 16 pins whose bases were little free standing, open coils.

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Posted: 16 February 2012 10:26 PM   [ Ignore ]   [ # 18 ]
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would it be worth investigating a pre ignition system for each pin by a small plasma current path that is pre initiated before the shot?
rather than hoping that each rod successfully establishes a filament, create the filament. the main shot would follow the small plasma line to each rod ensuring symmetry, it may in fact relieve the hat insulator from being subject to high currents along the sides.
it would also be useful in turning on or off a number of rods to find a suitable combination.  a high voltage flyback transformer for each pin could easily control a small streamer with a small insulated electrode close to the center electrode.  just a thought.

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contemplate on the weak link or pull the chain.

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