Edge Plasma Physics: Key Considerations for PIC Codes & Simulations

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Key considerations for simulating the edge plasma region in devices like tokamaks include understanding the electron sheath dynamics at the walls and diagnostic devices, as well as the presence of a non-Maxwellian distribution of particles. High gradients in temperature and electric potential are critical factors, and when developing a PIC code, it's essential to account for the electron-Larmor radius relative to grid dimensions. Additionally, the increased density of neutrals near the plasma edge can lead to spallation reactions upon contact with the wall, introducing contamination into the plasma. Effective heating methods, such as neutral beam injection and microwave heating, also play a significant role in edge plasma behavior. Overall, these elements are vital for accurate modeling and simulation of edge plasma processes.
LuisVela
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Hello everybody.
Im starting a project on the basic processed undergoing in the edge plasma region. ( I mean, near the walls of a plasma confining device, like a tokamak or so.)

I was wondering if you could name some ''things'' I should be aware of in order to make a small PIC code or computer simulation.

I came up with these ones:

1.) Electron sheath on the walls, and over diagnostic devices (Probes and so on..).

2.) Non-Maxwellian distribution near the edge.

3.) High gradients on temperature & electric potential.

4.) In case of a PIC code, be awarer that the electron-larmor radius is bigger than the dimensions of the cell composing the grid.

...any suggestions?
 
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There would be a greater density of neutrals near the edge of the plasma. If the plasma (neutral) make it to the wall, then there are spallation reactions with the wall, and that is the source of contamination (of higher Z atoms) in the plasma. If the current density is greater in the sheath, then the sheath temperature is higher and the heat must be conducted to the interior.

The heating might also be accomplished by neutral beam injection, microwave heating and compression.
 

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