Laguerre-Gaussian Mode Laser Heater for Microbunching Instability Suppression in Free-Electron Lasers
Abstract
Microbunching instability (MBI) driven by beam collective effects is known to be detrimental to high-brightness storage rings, linacs, and free-electron lasers (FELs). One known way to suppress this instability is to induce a small amount of energy spread to an electron beam by a laser heater. The distribution of the induced energy spread greatly affects MBI suppression and can be controlled by shaping the transverse profile of the heater laser. Here, we present the first experimental demonstration of effective MBI suppression using a LG01 transverse laser mode and compare the improved results with respect to traditional Gaussian transverse laser mode at the Linac Coherent Light Source. The effects on MBI suppression are characterized by multiple downstream measurements, including longitudinal phase space analysis and coherent radiation spectroscopy. We also discuss the role of LG01 shaping in soft x-ray self-seeded FEL emission, one of the most advanced operation modes of a FEL for which controlled suppression of MBI is critical.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)
- OSTI Identifier:
- 1607605
- Alternate Identifier(s):
- OSTI ID: 1616848
- Grant/Contract Number:
- AC02-76SF00515; SC0014664
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Name: Physical Review Letters Journal Volume: 124 Journal Issue: 13; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; Beam control; Beam dynamics; Beam impedance; Beam instabilities; Nonlinear beam dynamics; Relativistic multiple-particle dynamics
Citation Formats
Tang, Jingyi, Lemons, Randy, Liu, Wei, Vetter, Sharon, Maxwell, Timothy, Decker, Franz-Josef, Lutman, Alberto, Krzywinski, Jacek, Marcus, Gabriel, Moeller, Stefan, Huang, Zhirong, Ratner, Daniel, and Carbajo, Sergio. Laguerre-Gaussian Mode Laser Heater for Microbunching Instability Suppression in Free-Electron Lasers. United States: N. p., 2020.
Web. doi:10.1103/PhysRevLett.124.134801.
Tang, Jingyi, Lemons, Randy, Liu, Wei, Vetter, Sharon, Maxwell, Timothy, Decker, Franz-Josef, Lutman, Alberto, Krzywinski, Jacek, Marcus, Gabriel, Moeller, Stefan, Huang, Zhirong, Ratner, Daniel, & Carbajo, Sergio. Laguerre-Gaussian Mode Laser Heater for Microbunching Instability Suppression in Free-Electron Lasers. United States. https://doi.org/10.1103/PhysRevLett.124.134801
Tang, Jingyi, Lemons, Randy, Liu, Wei, Vetter, Sharon, Maxwell, Timothy, Decker, Franz-Josef, Lutman, Alberto, Krzywinski, Jacek, Marcus, Gabriel, Moeller, Stefan, Huang, Zhirong, Ratner, Daniel, and Carbajo, Sergio. Mon .
"Laguerre-Gaussian Mode Laser Heater for Microbunching Instability Suppression in Free-Electron Lasers". United States. https://doi.org/10.1103/PhysRevLett.124.134801.
@article{osti_1607605,
title = {Laguerre-Gaussian Mode Laser Heater for Microbunching Instability Suppression in Free-Electron Lasers},
author = {Tang, Jingyi and Lemons, Randy and Liu, Wei and Vetter, Sharon and Maxwell, Timothy and Decker, Franz-Josef and Lutman, Alberto and Krzywinski, Jacek and Marcus, Gabriel and Moeller, Stefan and Huang, Zhirong and Ratner, Daniel and Carbajo, Sergio},
abstractNote = {Microbunching instability (MBI) driven by beam collective effects is known to be detrimental to high-brightness storage rings, linacs, and free-electron lasers (FELs). One known way to suppress this instability is to induce a small amount of energy spread to an electron beam by a laser heater. The distribution of the induced energy spread greatly affects MBI suppression and can be controlled by shaping the transverse profile of the heater laser. Here, we present the first experimental demonstration of effective MBI suppression using a LG01 transverse laser mode and compare the improved results with respect to traditional Gaussian transverse laser mode at the Linac Coherent Light Source. The effects on MBI suppression are characterized by multiple downstream measurements, including longitudinal phase space analysis and coherent radiation spectroscopy. We also discuss the role of LG01 shaping in soft x-ray self-seeded FEL emission, one of the most advanced operation modes of a FEL for which controlled suppression of MBI is critical.},
doi = {10.1103/PhysRevLett.124.134801},
journal = {Physical Review Letters},
number = 13,
volume = 124,
place = {United States},
year = {Mon Mar 30 00:00:00 EDT 2020},
month = {Mon Mar 30 00:00:00 EDT 2020}
}
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https://doi.org/10.1103/PhysRevLett.124.134801
https://doi.org/10.1103/PhysRevLett.124.134801
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Cited by: 14 works
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Figures / Tables:
FIG. 1: Simplified schematic of start-to-end experimental configuration, from the photoinjector to the SXRSS diagnostic end station (not drawn to scale).
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