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CERN to Start Up the Large Hadron Collider. Now Here's How It Plans to Stop It

How the LHC stops a proton beam that can melt a half ton of copper

2 min read

13 August 2008—This week, the Large Hadron Collider (LHC)—the world’s most powerful particle accelerator—began test runs, sending a stream of protons around a quarter of its 27-kilometer circumference. The European Organization for Nuclear Research (known as CERN), in Geneva, Switzerland, where the LHC is housed, says the tests are part of the preparations for the machine’s projected 10 September start-up date.

The experiment will hurtle two hair-thin beams of hundreds of trillions of protons around a ring-shaped accelerator at 99.99 percent the speed of light, knocking the beams together 11 000 times each second. According to CERN LHC accelerator physicist Rüdiger Schmidt, who is in charge of machine protection systems, each unimpeded beam is capable of melting a 500-kilogram block of copper.

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Economics Drives Ray-Gun Resurgence

Laser weapons, cheaper by the shot, should work well against drones and cruise missiles

4 min read
In an artist’s rendering, a truck is shown with five sets of wheels—two sets for the cab, the rest for the trailer—and a box on the top of the trailer, from which a red ray is projected on an angle, upward, ending in the silhouette of an airplane, which is being destroyed

Lockheed Martin's laser packs up to 300 kilowatts—enough to fry a drone or a plane.

Lockheed Martin

The technical challenge of missile defense has been compared with that of hitting a bullet with a bullet. Then there is the still tougher economic challenge of using an expensive interceptor to kill a cheaper target—like hitting a lead bullet with a golden one.

Maybe trouble and money could be saved by shooting down such targets with a laser. Once the system was designed, built, and paid for, the cost per shot would be low. Such considerations led planners at the Pentagon to seek a solution from Lockheed Martin, which has just delivered a 300-kilowatt laser to the U.S. Army. The new weapon combines the output of a large bundle of fiber lasers of varying frequencies to form a single beam of white light. This laser has been undergoing tests in the lab, and it should see its first field trials sometime in 2023. General Atomics, a military contractor in San Diego, is also developing a laser of this power for the Army based on what’s known as the distributed-gain design, which has a single aperture.

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