"And, of course, there's a trade-off issue: security. The line between "orbiting solar power satellite" and "orbital death ray" is a fuzzy one (albeit not as fuzzy as some people would think, but still...)" 

I'd read up on it ;) the Microwave beam used would be weak enough you could walk through it and have no ill effects. thats the reason for the 10km receiver...

Airport security is a burden we must all shoulder. Do your part, and please grope yourself in advance.