How to make an X-ray laser that’s colder than space

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How to make an X-ray laser that’s colder than space
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What's cooler than being cool? This ultra-cold X-ray beam.

When it came online in 1966, this so-called Stanford Linear Accelerator was an engineering marvel. In the following decades, the particle physics research conducted there led to no fewer thanNobel prizes in physics. But by the 21st century, it had become something of a relic, surpassed by other accelerators at CERN and elsewhere that could smash particles at far higher energies and see things Stanford couldn’t.

LCLS is an example of an apparatus called an X-ray free-electron laser . Although it is a laser, it doesn’t have much in common with the little handheld laser pointers that excite kittens. Those create a laser beam using electronic components such as diodes.

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