Still Russ had a second Pop from the green glow. Not as potent as the first but still.
Thanks for your response.
IMHO, the pop will still occur but it will not accelerate toward the piston because there is no change in the charge of the plasma since all the gas inside the cylinder is negatively charged.
There is negative charge inside the pop(plasmoid) and negative charge outside the plasmoid; that green glow is electrons hitting helium atoms.
A skier cannot accelerate on level ground. He needs a charge in altitude to ski down.
In like manner, a plasmoid cannot accelerate toward a positive charge when there is no charge difference.
I like it how they let the magnetic field turn on itself, like blowing a smoke ring it keeps turning inside out.
I think that is cool too.
It is the latest thing in plasma physics. It is called Field Reverse Current(FRC).
I don't see where the thrust is now aimed at. They perform this in a vacuumed tube and the plasmoid is directed towards the pre-ionizing coil?
After the plasmoid is formed by the spark discharge, it is accelerated away from the primary spark discharge and shot down the tube by the magnetic field like a rail gun.
The pre-ionizing shot is part of the spark discharge and is done by the same electrodes as the primary high current spark discharge. The spark discharge is a two step process: 1- pre-ionization and 2- high current spark
The plasmoid exits the tube on the end of the tube opposite the spark discharge.
The accelerating plasmoid would be aimed at the face of the piston and would hit the face of the piston at the point of maximum plasmoid acceleration. This point would need to be determined by experiment.
The Papp cylinder is different from the space ion thruster in that there is no gas feeding process. The Papp engine does not need to operate in the vacuum of space. The Papp cylinder contains its own gas mix that is constant.
They mention that they haven't fired it repetively yet. I would think that the gas would build up or the vacuum pump has to work constant.
No vacuum pump is needed in the thruster. It operates in space.
But we have learned that we don't need new gas all the time
The Papp engine will only need to change gas every few years.
One portion can be re-used, so no need for the highspeed valve and no need for the built-in vacuum pump
This is true.
But all the gas in the papp cylinder can be reused for years.
Its not clear to me what kind of gauge wire they use. Also they mention kiloampere and that the pre-ionizer needs to bring 2-3 Joules per cycle and it has a Megaherz cycle.
So those numbers may be more difficult to reach then thought off at first glance?
This thruster is being designed to push a spacecraft around in space. It is powerful; more power than we need.
The design of the Papp/thruster hybrid must be downsized. This is the job of the papp hardware designer.