LASER CLEANER: removes rust, old paint, etc.

[NeiljohnUK]

I once got to stand at the end of the main beam output at SLAC. Fortunately they had the magnets turned on and the beam was being deflected to a different experiment. No "do not stare into beam" sign, but the backstop for the beam was a huge steel block with deep pits blasted into it.

Reminds me of one of our former senior researchers, now 'retired' but still active, he told the story of beam path idiocy involving people moving mirrors and stuff live in a multi-megawatt facility, he cured most of them by hanging half a pig in the beam path and blowing large holes through it with each beam 'shot'...