No need to wait for Fourth of July any more. Once this technology is fully deployed in all airports by TSA you would be seeing this. . The large donut and the thick pillar are parts of the Van de Graff generator
No, they aren't. Those are pictures of Tesla coils. A Van de Graff generator is like an industrial version of rubbing a glass rod with a piece of wool - it works via electrostatics. A Tesla coil is a resonant transformer with a huge turns ratio - it works via magnetic induction.