Jaitner mentions these conditions for formation of condensed plasmoids:
In order to a z-pinched plasmoid to condense, several conditions are
instrumental:
• The current
pulse should be very short, i.e. less than a microsecond in duration.
• The current
needs to be strong enough, i.e. more than hundred amps.
• The plasmoid
should be cooled, i.e. by running the discharge along a dielectric
surface or under water.
• Dense matter
should be available, which can rapidly feed the forming plasmoid.
Typically either the cathode, or
the surrounding gas
or the dielectric surface will supply the matter that forms the
plasmoid.
• A magnetic field
in parallel to the electric field will steer the electrons in the
right direction
As far as I understand there is no dielectric surface in Egely's device. Ken Shoulders' texts show diagrams where there is that component also.
And where is the magnetic field in Egely's device ? The discharge current creates of course magnetic field but as far as I understand it's perpendicular instead of parallel to the plasmoid.
And what about strong enough current ? Maybe the current should be proportional to the electrode surface area (diameter of the plasmoid?) instead of an absolute value.
So this text gives some qualitative help but actual quantitative values needed in practice for each of those points seem to require a lot of experiments.