“This does not violate any rules or laws of physics.”
Nothing can travel faster than light, or 299,792,458 meters per second. But a certain group of particles acts as if it can, a team of physicists recently concluded, potentially paving the way for a powerful light source that could reveal new kinds of science. When electrons are excited and pushed around, they produce light of various energies that can be used to study phenomena far beyond the limits of the naked eye or typical microscopes.
—which achieved first light last month. can generate one million X-ray pulses per second, up from the original LCLS’ minuscule 120 pulses per second. The new X-ray pulses are 10,000 times brighter than those produced by LCLS, paving the way for scientists to peer at previously unseeable phenomena, from molecules in plant cells to how materials change phase. All those X-rays are produced by intentionally wobbling groups of fast-moving electrons, using large magnets.
work here. In a linear accelerator, “every electron is doing the same thing as the collective thing,” said Bernardo Malaca, a physicist at the Instituto Superior Técnico in Portugal and the study’s lead author, in a video call with Gizmodo. “There is no electron that’s undulating in our case, but we’re still making an undulator-like spectrum.” The researchers liken quasiparticles to the Mexican wave, a popular collective behavior in which sports fans stand up and sit down in sequence.
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