For the entire distance, the floor of the tunnel was covered with an electrically conducting aluminum trough.
All electrically conducting materials generate an electric field when energised with a voltage.
A pinch is the compression of an electrically conducting filament by magnetic forces.
Pinch is based on the fact that plasmas are electrically conducting.
It takes a lot of pressure (that means energy) to produce the electrically conducting form of hydrogen.
An insulated, electrically conducting loop is installed in the pavement.
Plasmas are electrically conducting, allowing a current to be passed through them.
The electrically conducting material is thus acting as a magnetic mirror.
Use in water, or other electrically conducting liquid, also requires a very thin layer of insulation over the metallic film.
A side effect would be that these shifted tubes can become electrically conducting, and perhaps generate their own magnetic fields.