Electron beam energy spread measurements using optical klystron radiation
Abstract
In accelerators, the electron beam longitudinal dynamics critically depend on the
energy distribution of the beam. Noninvasive, highly accurate measurement of the energy
spread of the electron beam in the storage ring remains a challenge. Conventional
techniques are limited to measuring a relatively large energy spread using the energy
spread induced broadening effect of radiation source size or radiation spectrum. In
this work, we report a versatile method to accurately measure the electron beam relative
energy spread from 10 -4 to 10-2 using the optical klystron radiation. A novel numerical
method based on the Gauss-Hermite expansion has been developed to treat both spectral
broadening and modulation on an equal footing. A large dynamic range of the measurement
is realized by properly configuring the optical klystron. In addition, a model-based
scheme has been developed for the first time to compensate the beam-emittance-induced
inhomogeneous spectral broadening effect to improve the accuracy of the energy spread
measurement. Using this technique, we have successfully measured the relative energy
spread of the electron beam in the Duke storage ring from 6×10-4 to 6×10-3 with an
overall uncertainty of less than 5%. The optical klystron is a powerful diagnostic
for highly accurate energy spread measurement for storage rings and other advanced
electron accelerators. © 2010 The American Physical Society.
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Journal articlePermalink
https://hdl.handle.net/10161/4310Published Version (Please cite this version)
10.1103/PhysRevSTAB.13.080702Publication Info
Jia, B; Li, J; Huang Scott, S; Schmidler, C; & Wu, YK (2010). Electron beam energy spread measurements using optical klystron radiation. Physical Review Special Topics - Accelerators and Beams, 13(8). pp. 80702. 10.1103/PhysRevSTAB.13.080702. Retrieved from https://hdl.handle.net/10161/4310.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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Show full item recordScholars@Duke
Ying Wu
Professor of Physics
Prof. Wu is interested in nonlinear dynamics of charged particle beams, coherent radiation
sources, and the development of novel accelerators and light sources. One of his research
focuses is to study the charged particle nonlinear dynamics using the modern techniques
such as Lie Algebra, Differential Algebra, and Frequency Analysis. This direction
of research will significantly further the understanding of the nonlinear phenomena
in light source storage rings and collider rings, improve their p

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