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By Vladyslav Syrotenko (student of V. N. Karazin Kharkiv National University, PowerPoint Presentation
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Introductory presentation. Application of a Vlasov Solver to investigate The longitudinal beam dynamics in electron linear accelerators. By Vladyslav Syrotenko (student of V. N. Karazin Kharkiv National University, School of Physics and Technology) Supervised by P. Piot, T. Sen, F. Ostiguy at

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Presentation Transcript
slide1

Introductory presentation

Application of a Vlasov Solver to investigate The longitudinal beam dynamics in electron linear accelerators

By Vladyslav Syrotenko (student of V. N. Karazin Kharkiv National University,

School of Physics and Technology)

Supervised by P. Piot, T. Sen, F. Ostiguy at

Fermi National Accelerator Laboratory

Accelerator Physics Centre

PARTI Summer Internship Program

general overview of asta beamline elements pertinent to the longitudinal beam dynamics
General overview of ASTA beamline elements pertinent to the longitudinal beam dynamics

ASTA = Advanced Superconducting Test Accelerator

Linac-based free-electron lasers require very short (<100 fs) high-brightness electron beam with peak currents on the order of kiloamperes. These bunches cannot be produced directly in the electron guns because space charge forces would destroy the beam quality within the short distance. So it’s necessary to start with a low intensity bunch with peak current of a few tens amperes, accelerate it to energies where the space charge forces are weakened sufficiently by 1/gamma^2 scaling and then reduce the bunch length to increase the peak current.

plans
PLANS
  • Consider a beamline to be a four-dipole chicane and inject a bi-Gaussian distribution in the longitudinal phase space (t, E) with variable chirp and verify compression works as it was expected.
  • A second step will be to include CSR effects.

Chirp means differentiation of particles energy relatively to some reference particle

four-dipole chicane

CSR is an abbreviation of

coherent synchrotron radiation

The example of how CSR can influence on bunch energy distribution

purpose of this project
Purpose of this project

The idea of this method is not to track each particle, but to observe how distribution function is changing.

  • The purpose of this project is to carry numerical simulations of the longitudinal beam dynamics of an electron bunch undergoing longitudinal compression using Vlasov solver developed at Fermilab by Francois Ostiguy. We will use a Vlasov solver in the 2D longitudinal phase space suitable for applications in single-pass systems.
  • We want to investigate how useful existing Vlasov solver is. Do we need variable mesh or not?

Vlasov equation written for bunch compressor. Here F(z, s) includes collective forces.

steps
Steps
  • Check bunch compressor model without space charge forces, but including non-linear optics,
  • Include space charge and investigate how the compression works,
  • Include CSR into bunch compressor model and investigate microbunching instabilities on their onset.
additional explanation slide how the compression works
Additional explanation slide. How the compression works

Dependently of an energy chirp particles will travel shorter or longer distance. Under certain conditions we can make tail propagating faster than the head of the bunch. That will cause the compression.

Initial bunch length

After compression