IPAC2021 - List of Authors (Chao, A.)

Paper	Title	Page
MOXB01	Progress Towards Realisation of Steady-State Microbunching at the Metrology Light Source
	J. Feikes, A. Kruschinski, J. Li, A.N. Matveenko, Y. Petenev, M. Ries HZB, Berlin, Germany A. Chao SLAC, Menlo Park, California, USA X.J. Deng, W.-H. Huang, C.-X. Tang, L.X. Yan TUB, Beijing, People’s Republic of China A. Hoehl, R. Klein PTB, Berlin, Germany
	Coherent radiation is a powerful scheme for storage-ring-based synchrotron radiation sources as its intensity increases with the square of the number of radiating electrons. Formation of bunches or sub-bunches shorter than the radiation wavelength, i.e., microbunching, is necessary for the radiation from different electrons to add in phase and therefore cohere. Recently at the MLS it has been shown that in dedicated isochronous optics an electron beam energy modulation induced by an externally applied 1064-nm-wavelength laser in an undulator leads to the formation of sub-um microbunches one turn later, providing the basis for the implementation of steady-state microbunching in electron storage rings to generate high-repetition, high-power coherent radiation. Here we report on the recent progress and continuing development of this experiment. Deng, X., Chao, A., Feikes, J. et al. Experimental demonstration of the mechanism of steady-state microbunching. Nature 590, 576-579 (2021). https://doi.org/10.1038/s41586-021-03203-0*
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WEXA05	Solving for Collider Beam Profiles from Luminosity Jitter with Ghost Imaging	2524
	D.F. Ratner, A. Chao SLAC, Menlo Park, California, USA
	Large accelerator facilities must balance the need to achieve user performance requirements while also maximizing delivery time. At the same time, accelerators have advanced data-acquisition systems that acquire synchronous data at high-rate from a large variety of diagnostics. Here we discuss the application of ghost-imaging (GI) to measure beam parameters, switching the emphasis from beam control to data collection: rather than intentionally manipulating the accelerator, we instead passively monitor jitter gathered over thousands to millions of events to reconstruct the target of interest. Passive monitoring during routine operation builds large data sets that can even deliver higher resolution than brief periodic scans, and can provide experiments with event-by-event information. In this presentation we briefly present applications of GI to light-sources, and then discuss a potential new application for colliders: measuring the transverse beam shapes at a collider’s interaction point to determine both the integrated luminosity and the spatial distribution of collision vertices.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEXA05
About •	paper received ※ 19 May 2021 paper accepted ※ 27 July 2021 issue date ※ 10 August 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

MOXB01

Progress Towards Realisation of Steady-State Microbunching at the Metrology Light Source

J. Feikes, A. Kruschinski, J. Li, A.N. Matveenko, Y. Petenev, M. Ries
HZB, Berlin, Germany
A. Chao
SLAC, Menlo Park, California, USA
X.J. Deng, W.-H. Huang, C.-X. Tang, L.X. Yan
TUB, Beijing, People’s Republic of China
A. Hoehl, R. Klein
PTB, Berlin, Germany

Coherent radiation is a powerful scheme for storage-ring-based synchrotron radiation sources as its intensity increases with the square of the number of radiating electrons. Formation of bunches or sub-bunches shorter than the radiation wavelength, i.e., microbunching, is necessary for the radiation from different electrons to add in phase and therefore cohere. Recently at the MLS it has been shown that in dedicated isochronous optics an electron beam energy modulation induced by an externally applied 1064-nm-wavelength laser in an undulator leads to the formation of sub-um microbunches one turn later*, providing the basis for the implementation of steady-state microbunching in electron storage rings to generate high-repetition, high-power coherent radiation. Here we report on the recent progress and continuing development of this experiment.
Deng, X., Chao, A., Feikes, J. et al. Experimental demonstration of the mechanism of steady-state microbunching. Nature 590, 576-579 (2021). https://doi.org/10.1038/s41586-021-03203-0

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WEXA05

Solving for Collider Beam Profiles from Luminosity Jitter with Ghost Imaging

2524

D.F. Ratner, A. Chao
SLAC, Menlo Park, California, USA

Large accelerator facilities must balance the need to achieve user performance requirements while also maximizing delivery time. At the same time, accelerators have advanced data-acquisition systems that acquire synchronous data at high-rate from a large variety of diagnostics. Here we discuss the application of ghost-imaging (GI) to measure beam parameters, switching the emphasis from beam control to data collection: rather than intentionally manipulating the accelerator, we instead passively monitor jitter gathered over thousands to millions of events to reconstruct the target of interest. Passive monitoring during routine operation builds large data sets that can even deliver higher resolution than brief periodic scans, and can provide experiments with event-by-event information. In this presentation we briefly present applications of GI to light-sources, and then discuss a potential new application for colliders: measuring the transverse beam shapes at a collider’s interaction point to determine both the integrated luminosity and the spatial distribution of collision vertices.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEXA05

About •

paper received ※ 19 May 2021 paper accepted ※ 27 July 2021 issue date ※ 10 August 2021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)