Analysis of photoinjector transverse phase space in action and phase coordinates

Photoinjectors are the main high brightness electron sources for x-ray free electron lasers (XFELs). Photoinjector emittance reduction is one of the key knobs for improving XFEL lasing, so precise emittance measurement is critical. It is well known that rms emittance is very sensitive to low intensi...

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Published in:Physical review. Accelerators and beams 2022-10, Vol.25 (10), p.103401, Article 103401
Main Authors: Qian, Houjun, Krasilnikov, Mikhail, Aboulbanine, Zakaria, Adhikari, Gowri, Aftab, Namra, Boonpornpras, Prach, Georgiev, Georgi, Good, James, Gross, Matthias, Koschitzki, Christian, Li, Xiangkun, Lishilin, Osip, Lueangaramwong, Anusorn, Niemczyk, Raffael, Oppelt, Anne, Shu, Guan, Stephan, Frank, Vashchenko, Grygorii, Weilbach, Tobias
Format: Article
Language:English
Subjects:
Brightness
Electron sources
Emittance
Free electron lasers
Image processing
Knobs
Signal processing
Signal to noise ratio
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Summary:Photoinjectors are the main high brightness electron sources for x-ray free electron lasers (XFELs). Photoinjector emittance reduction is one of the key knobs for improving XFEL lasing, so precise emittance measurement is critical. It is well known that rms emittance is very sensitive to low intensity tails of particle distributions in the phase space, whose measurement depends on the signal to noise ratio and image processing procedures. Such sensitivities make the interpretations of beam transverse brightness challenging, leading to different emittance definitions to reduce the impact of tail particles. In this paper, transverse phase space is analyzed in action and phase coordinates for both analytical models and experiments, which gives a more intuitive way to calculate the beam core brightness.
ISSN:2469-9888
2469-9888
DOI:10.1103/PhysRevAccelBeams.25.103401