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CCD image of "betatron" x rays from a 28.5-GeV electron beam propagating through a less-dense plasma. The highly relativistic beam creates an ion channel as it expels electrons from the plasma; the channel in turn causes oscillations in the beam envelope, leading to the emission of radiation. This experiment, carried out at SLAC, is the first to show that an ion channel can act in this manner to generate radiation in the keV range. |


