Angular momentum mechanism

[Elling]

Hello,

what is the mechanism of the injected angular momentum ?
Is is that the elementary plasmoids will be denser because more ions will be trapped in the same volume since they have a azimuthal velocity component ?
Or is it that elementary plasmoids should gently fuse into bigger ones because of inertial centrifugal movements after pinch ?

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[Lerner]

The plasmoid has angular momentum, which has to come from somewhere. Imagine a smoke ring spining around its axis. Since the velocity of the plasma in the plasmoid is a constant for a given ion, the larger the plasmoid, the more angular momentum per unit mass is needed. Injecting the angular momentum in theory should lead to a bigger plasmoid, up to the point that the plasmoid has all the energy in the device.

Also, without injected angualr momentum, the angualr momenutm is probably affected a lot by small variations in how the plasma runs down the electrodes. This may be a major cuase of the shto-to shot variability of the plasma focus. So injecting the momentum may make this variation much less.

By the way, this thread really belongs to plasma focus, not z-pinch.

[Focus Fusion Society]

OK, I moved it to “Plasma Physics”. (Admins can do that. We have powers). Would you like to rename the “Plasma Physics” forum “Plasma Focus”? Or is it OK for both Plasma Focus and more general Plasma Physics topics to fall under this category?

Note: Per this message forum has been renamed:

I think plasma focus would be better. and have a less forbidding descripton–we want to welcome, not scare away lay types. I don’t think any technical discussions should be incomprehesnible to non-physicists. Hmmm, triple negative. Anyway everything should be understandable by everyone. Eric

[Elling]

From your answer, the elementary plasmoids both get bigger and the ions in it collectively gain an azimuthal velocity component. I guess elementary plasmoids form in a characteristic size and at a characteristic pitch in the reference case, ie without angular momentum injection. So given the right amount of stir, the thoroid could merge into a single huge plasmoid ? But, the faster the merging, the better .. because this leaves a maximum amount of time for the creation of fusion reactions before collapse ? However, too much stir would cause elementary plasmoids to fly thru each other or destroy each other upon collision?

What about the 3rd dimension – along the axis ? The thoroid sheath is thin, what determines the thickness ? Could the rate of voltage buildup at the starting line influence the thickness of the slab that ignites into plasma filaments that start running ? I understand that the rundown velocity depends on the geometry, plasma particle’s mass and pressure. What about repeating the helicoidal trick at the end of the runway so to speak ? Tapering to a smaller electrode separation would modulate the local rundown velocities so as to compress the thickness of the slab – and tapering wider would strech the domain in the time window capable of plasmoid formation ?

[willit]

new to the forum but not to machines. just wondering why everyone is talking implementation/integration in vehicles rather than focusing on a working prototype?
that being said:
thinking about the amount of gas that is available to fuse in a plasmoid. does the size of the plasmoid have a limit. how do you measure.
what pressure is the gas in the vac chamber
what voltage is the plasma sheet running at (in current tests) could the voltage be reduced so long as a sufficient plasma sheet be formed. use less expensive capacitor bank does Volts x amps =watts apply?
what is the advantage or dis advantage of the number of electrodes surrounding the inner electrode.
has anyone tried a low velocity rotating gas (recirculating) emitted from the center of the core? this seems to work well for plasma cutting devices. however higher pressures and velocities.it keeps the hotter gasses centered while cooler gas is centerfuged to the walls of the plasma tip (plasma cutter used for metal fab)
in order to ” fix” a mahine you must know the basics of how it is supposto run.
in order to upgrade a machine you must have an intimate knowledge of every aspect of design, material selection,operating parameters. ect.

soo many questions. the shape of the focus electrodes. material selection. does the shape have an impact on the collapse of the plasmoid. would a shorter or longer collapse time have an impact on temp of the plasmoid neuculi? seems that a current induced magnetic containment sufficient in size to contain an appericiable amount of fusion “fuel” could be electrically manipulated to put the hammer down and squeeze the heck out of the atoms forcing them to bond. what impact does plasmoid life have on xray generation.

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