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Contact: Paul Preuss
DOE/Lawrence Berkeley National Laboratory

Betatron Radiation Emittance Experiment

Caption: The LOASIS team measured the emittance of the electron beam by recording the spectrum of the x-ray pulse it emitted as the electrons accelerated, a phenomenon known as betatron radiation. The electron pulse itself (multiple pulses are shown here for clarity) is first diverted by the strong magnets of an electron spectrometer. The drive laser beam (red) is then deflected by a mirror of foils, through which the x-ray pulse (green) passes unhindered. The camera is positioned 4.7 meters away behind a window inside a vacuum chamber, surrounded by lead and plastic shielding with additional shielding from a concrete wall.

Credit: Lawrence Berkeley National Laboratory

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