How will the vortex be prevented from getting too large, from getting away or from wrecking the station?
The primary devices for controlling vortex intensity will be adjustable flow restrictors. These adjustable restrictors would be similar to widely used air dampers. There would be remotely adjustable air dampers in the tangential air entries. For safety there could be redundant remotely adjustable air dampers upstream of the heat exchanger. The air dampers provide two means of completely shutting off the air inlet to the vortex producer thereby stopping the vortex. The vortex could not jump out of the cylindrical wall and reform outside the station because the air outside the station is not heated, has no buoyancy and has no source of rotation. The probability of a vortex re-forming outside the station is lower than the probability of a natural tornado forming in the some distance away because the AVE draws warm surface from its immediate area and would make the area next to the station less suitable for supporting a natural tornado than surface air far away.
