Beams Document 8696-v1

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Developing an Angular Correlation Measurement of Undulator Radiation from a Single Electron in the IOTA Facility

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Evan Angelico
Updated by:
Evan Angelico
Document Created:
25 Sep 2020, 18:48
Contents Revised:
25 Sep 2020, 18:48
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16 Oct 2020, 19:00
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The properties of radiation emitted when a single electron passes through an undulator element, though quantum in nature due to small occupation number, should extrapolate to the same observed properties of undulator radiation in the high occupation number of an intense electron beam. A measurement of the angular distribution of radiation from a single electron is being developed at the Integrable Optics Test Accelerator (IOTA) facility under the experimental name AMPUR, described in this document. One feature of undulator radiation from a single electron is that during a single accelerator period, there is a non-negligable chance that two photoelectrons are generated in a detector viewing the radiation region. The system described in this document is designed to measure the angle between these two photoelectrons relative to the trajectory of the circulating electron. Micro-channel plate based photomultipliers are considered as a candidate detector technology, and a small detector has been used to measure undulator radiation in the Run 2b phase of IOTA. The considerations for a next phase of this measurement are detailed, possibly involving the use of Large Area Picosecond Photodetectors.
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