Live data from Hacker News

Los Alamos is capturing images of explosions at 7 millionths of a second

lanl.gov

11–20 of 106 posts

Re: Los Alamos is capturing images of explosions at 7 millionths of a second

#13

Fascinating look into the dynamic imaging capabilities at Los Alamos National Lab—essentially, how the U.S. is able to analyze nuclear-level explosive events without actually conducting nuclear tests. The Lab uses multiple systems to image these high-speed events: • pRad uses proton radiography to get 20–40 frames of a detonation, with material-level resolution based on density. • DARHT uses dual-axis x-ray imaging t…

Thank you for contextualizing this. We are truly living in a wild part of the space time continuum.

Re: Los Alamos is capturing images of explosions at 7 millionths of a second

#14
post #4

Wow, this is wild. billionths of a second?!

I'm reminded of Grace Hopper's famous nanoseconds lecture: https://youtu.be/gYqF6-h9Cvg?t=78

1 ns * c = 1 ft, to put in perspective: 7 μs * c is 1.3 miles.

(Protip: just type "7 μs * c in miles" into Google)

Re: Los Alamos is capturing images of explosions at 7 millionths of a second

#17
7mths? What unit is that. Did they mean 7μs resolution? How is that special? I see youtubers doing nanoseconds.

edit: here is the important information in this article.

> Scorpius is a new accelerator project planned for the Nevada National Security Site (NNSS) that will use an electron beam that can be broken into customized pulses to deliver x-rays and capture multiple images only hundreds of nanoseconds apart.

So 0.1μs or 100ns temporal resolution 3D X-ray.

Re: Los Alamos is capturing images of explosions at 7 millionths of a second

#18
post #15

Wow, this is wild. billionths of a second?!

"Millionths", abbreviated "mths of a second" here for... reasons... Known to the entire world, including American STEM people, as a microsecond.

Anything to avoid using the proper units, you wouldn't want the Americans audience to be enlightened wouldn't you.

Re: Los Alamos is capturing images of explosions at 7 millionths of a second

#19
post #17

7mths? What unit is that. Did they mean 7μs resolution? How is that special? I see youtubers doing nanoseconds. edit: here is the important information in this article. > Scorpius is a new accelerator project planned for the Nevada National Security Site (NNSS) that will use an electron beam that can be broken into customized pulses to deliver x-rays and capture multiple images only hundreds of nanoseconds apart. So…

The first line of the articles says "seven-millionths of a second", which would be 1/7μs or 0,14μs. They also mention that the camera shot 16 frames in that period, so that would be once every 0,00875μs or once every 8,75ns

Youtubers are a couple of magnitudes away from that, AFAIK

Post reply on HN