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Theoretical and numerical analyses of a slit-masked chicane for modulated bunch generation

Journal Article · · Journal of Instrumentation
 [1];  [2];  [3]
  1. Northern Illinois Univ., DeKalb, IL (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Northern Illinois Univ., DeKalb, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
+ Show Author Affiliations
Density modulations on electron beams can improve machine performance of beam-driven accelerators and FELs with resonance beam-wave coupling. The beam modulation is studied with a masked chicane by the analytic model and simulations with the beam parameters of the Fermilab Accelerator Science and Technology (FAST) facility. With the chicane design parameters (bending angle of 18o, bending radius of 0.95 m and R56 ~ –0.19 m) and a nominal beam of 3 ps bunch length, the analytic model showed that a slit-mask with slit period 900 μ m and aperture width 300 μ m induces a modulation of bunch-to-bunch spacing ~ 100 μ m to the bunch with 2.4% correlated energy spread. With the designed slit mask and a 3 ps bunch, particle-in-cell (PIC) simulations, including nonlinear energy distributions, space charge force, and coherent synchrotron radiation (CSR) effect, also result in beam modulation with bunch-to-bunch distance around 100 μ m and a corresponding modulation frequency of 3 THz. The beam modulation has been extensively examined with three different beam conditions, 2.25 ps (0.25 nC), 3.25 ps (1 nC), and 4.75 ps (3.2 nC), by tracking code Elegant. The simulation analysis indicates that the sliced beam by the slit-mask with 3 ~ 6% correlated energy spread has modulation lengths about 187 μ m (0.25 nC), 270 μ m (1 nC) and 325 μ m (3.2 nC). As a result, the theoretical and numerical data proved the capability of the designed masked chicane in producing modulated bunch train with micro-bunch length around 100 fs.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1234898
Alternate ID(s):
OSTI ID: 22497668
Report Number(s):
FERMILAB-PUB--15-454-APC; arXiv eprint number arXiv:1511.02172
Journal Information:
Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 10 Vol. 10; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

References (9)

Amplified coherent emission from electron beams prebunched in a masked chicane
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journal June 1996
Beam dynamics performances and applications of a low-energy electron-beam magnetic bunch compressor
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journal August 2013
Generation of Trains of Electron Microbunches with Adjustable Subpicosecond Spacing journal July 2008
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Possibility of a multibunch plasma afterburner for linear colliders journal November 2004
Velocity bunching of high-brightness electron beams journal January 2005
Imaging Atomic Structure and Dynamics with Ultrafast X-ray Scattering journal June 2007

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Tunable High Spatio-Spectral Purity Undulator Radiation from a Transported Laser Plasma Accelerated Electron Beam journal December 2019
Electron Beam Brightness and Undulator Radiation Brilliance for a Laser Plasma Acceleration Based Free Electron Laser journal January 2020

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Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
accelerator modelling and simulations (multi-particle dynamics
beam dynamics
beam-intensity monitors
beam-line instrumentation (beam position and profile monitors
bunch length monitors)
instrumentation for FEL
single-particle dynamics)