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Re: 20 joules at 100 bps vs 4 joules at 500 bps



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Stork,

Displacement current density is the time dirivative of the displacement field (D) and is in the direction of the E field (for isotropic media). D=permittivity*E and is normally associated with dialectrics, yes. A conductor (non superconducting material) will have some resistance and some E field in the direction of the conduction path (assuming current flow). What I dont know is if there is some small permittivity associated with the conductor (probably not), but if so, this might suggest some small displacement current in the conductor. Many dialectics have some conduction or leakage so there are gray areas. However, this is not what I was refering to. The capacitance of the toroid is distributed spacially to ground and is charged (non ionized air is the dialectric). As the toroid is discharged thru the streamer (the conduction path), the voltage on the toroid is reduced and hence there is a change in D and a displacement current results (again spacially distributed about the toroid).

Gerry R.

Original poster: stork <stork@xxxxxxxxxxxxxxxxxxx>

Friends,

Another huge mistake in the categorization of the so called displacement current.

Displacement currents only occur in dielectrics.

Never do displacement currents occur in conductors. The do not occur in metal conductors or plasma arcs or streamers. If a charge particle is capable of moving in a conductor then by definition it's not displacement current. Once charge particles, such as electrons or ions, are capable of moving in a streamer or arc channel then the resultant current is just plain old EM current.

Stork




Tesla list wrote:

Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
Hi Boris,
At the risk of misinterpreting what has been said, consider a toroid that has been charged to the breakout point and at the instant breakout begins, imagine the secondary coil being totally removed. A streamer begins and lets say it still connects to ground. It seems the circuit is the capacitance of the toroid (to ground), the streamer impedance, and the return path carries the displacement current. The impedance mentioned below would now be infinite and yet the streamer and power arc would still occur. It seems that with the secondary in place, the impedance Z (below) would help with the recharging of the toroid and the sustainability of the arc.

To say that the circuit element connecting the toroid to ground is its capacitance, and to say that the return path is by displacement current are exactly the same thing. What exists in series with the streamer is a charged capacitor, with the secondary coil in -parallel- with it. If at the instant of the discharge there is no significant energy stored in other parts of the system than the terminal capacitance, the presence of the secondary coil would -reduce- the streamer current, by providing an alternative (although high-impedance) path to the current coming from the capacitor, instead of contributing to it. Antonio Carlos M. de Queiroz