On: GoPro Ride Through an Electron Beam Irradiator at ...

[omgJustTest]

Blue light just before entry - very likely Cherenkov radiation.

Apparently some phosphorescent materials or just electron-induced heating on the cart in front.

White speckles are electrons !

[preisschild → omgJustTest]

Cherenkov radiation only appears under water. In this case it is because the electrons ionize the air.

[omgJustTest → preisschild]

Cherenkov exists in all media except vacuum. It is when electrons travel faster than speed of light in the media (in this case air).

In vacuum they are limited by the speed of light.

For example: https://www.mpi-hd.mpg.de/hfm/CosmicRay/ChLight/Cherenkov.ht....

Also, hello! my name is Ryan & we are likely in the same field.