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inasio06/16/20253 repliesview on HN

“It’s a lot easier to send a power beam directly up or down relative to the ground because there is so much less atmosphere to fight through,” Jaffe explains. “For PRAD, we wanted to test under the maximum impact of atmospheric effects.”

Super impressive! My only complain is that this was done at the White Sounds desert in New Mexico, at over 1200 meters of elevation. For maximum impact they should have done it in Florida on a hot humid day


Replies

madaxe_again06/16/2025

Humidity would most likely attenuate the beam from 20% end to end to less than 1% - water vapour absorbs energy like nobody’s business.

This is a tech for arid environments - which seem to be where the US does most of its deployments these days.

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AndrewKemendo06/16/2025

There’s no range in Florida large enough for this test otherwise I’m sure they would have.

Even Eglin wouldn’t be large enough.

contrarian123406/16/2025

"maximum impact of atmospheric effects" would be simply a foggy day...

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