Beams Document 8572-v1

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Study of photon statistics of undulator radiation in the IOTA storage ring. Including the case of a single electron in the ring

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Rob Ainsworth
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Rob Ainsworth
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14 Jul 2020, 17:10
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14 Jul 2020, 17:10
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14 Jul 2020, 17:10
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There have been two recent experiments studying statistical properties of undulator radiation in the Integrable Optics Test Accelerator (IOTA) storage ring at Fermilab. The first experiment studies the turn-to-turn fluctuations in the number of photons emitted by a bunch consisting of many electrons (beam current of several mA). This experiment shows that the fluctuations depend on the shape and size of the electron bunch. It reveals the possibility to measure the small vertical size of the flat beam in IOTA, when conventional synchrotron radiation monitors may be unreliable due to the diffraction limit. The second experiment studies the photon statistics of undulator radiation generated by a single electron circulating in the ring, when, on average, there is only one photocount per 300 revolutions. The collected data are analyzed to find possible deviations from the expected Poisson process exhibiting uncorrelated detection events.
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