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Title: Chirped Electron Bunch Energy Compensation for an X-Ray Light Source

 [1];  [1];  [1];  [1];  [1]
  1. Euclid Techlabs, LLC Cleveland, OH (United States)
Publication Date:
Research Org.:
Euclid Techlabs, LLC Cleveland, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Type / Phase:
Resource Type:
Technical Report
Country of Publication:
United States
43 PARTICLE ACCELERATORS; Bunch shaping; Wakefield accelerator; Chirp compensation

Citation Formats

Kanareykin, Alex, Kanareykin, Alexei, Schoessow, Paul, Jing, Chunguang, and Antipov, Sergey. Chirped Electron Bunch Energy Compensation for an X-Ray Light Source. United States: N. p., 2015. Web.
Kanareykin, Alex, Kanareykin, Alexei, Schoessow, Paul, Jing, Chunguang, & Antipov, Sergey. Chirped Electron Bunch Energy Compensation for an X-Ray Light Source. United States.
Kanareykin, Alex, Kanareykin, Alexei, Schoessow, Paul, Jing, Chunguang, and Antipov, Sergey. 2015. "Chirped Electron Bunch Energy Compensation for an X-Ray Light Source". United States. doi:.
title = {Chirped Electron Bunch Energy Compensation for an X-Ray Light Source},
author = {Kanareykin, Alex and Kanareykin, Alexei and Schoessow, Paul and Jing, Chunguang and Antipov, Sergey},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 1

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  • We propose a simple method to produce short x-ray pulses using a spatially chirped electron bunch in a SASE FEL. The spatial chirp is generated using an rf deflector which produces a transverse offset (in y and/or y') correlated with the longitudinal bunch position. Since the FEL gain is very sensitive to an initial offset in the transverse phase space at the entrance of the undulator, only a small portion of the electron bunch with relatively small transverse offset will interact significantly with the radiation, resulting in an x-ray pulse length much shorter than the electron bunch length. The x-raymore » pulse is also naturally phase locked to the rf deflector and so allows high precision timing synchronization. We discuss the generation and transport of such a spatially chirped electron beam and show that tens of femtosecond long pulse can be generated for the linac coherent light source (LCLS).« less
  • Electron lenses for the head-on beam-beam compensation are under construction at the Relativistic Heavy Ion Collider. The bunch length is of the same order as the {beta}-function at the interaction point, and a proton passing through another proton bunch experiences a substantial phase shift which modifies the beam-beam interaction. We review the effect of the bunch length in the single pass beam-beam interaction, apply the same analysis to a proton passing through a long electron lens, and study the single pass beam-beam compensation with long bunches. We also discuss the beam-beam compensation of the electron beam in an electron-ion collidermore » ring.« less
  • The electron pulses generated by the Linac Coherent Light Source at the SLAC National Accelerator Laboratory occur on the order of tens of femtoseconds and cannot be directly measured by conventional means. The length of the pulses can instead be reconstructed by measuring the spectrum of optical transition radiation emitted by the electrons as they move toward a conducting foil. Because the emitted radiation occurs in the mid-infrared from 0.6 to 30 microns a novel optical layout is required. Using a helium-neon laser with wavelength 633 nm, a series of gold-coated off-axis parabolic mirrors were positioned to direct a beammore » through a zinc selenide prism and to a focus at a CCD camera for imaging. Constructing this layout revealed a number of novel techniques for reducing the aberrations introduced into the system by the off-axis parabolic mirrors. The beam had a recorded radius of less than a millimeter at its final focus on the CCD imager. This preliminary setup serves as a model for the spectrometer that will ultimately measure the LCLS electron pulse duration.« less
  • We have studied the transverse coherent bunch instabilities for the Advanced Light Source (ALS). We have in particular applied a Hamiltonian formalism to obtain the linearized averaged equations of motion (i.e. the one turn map) for the resistive wall effect to obtain the corresponding localized kick when the beta function is varying along the lattice. We have also included a 2-dimensional model for the transverse higher order cavity modes. In addition, we have used power series maps to represent the lattice which enabled us to include non-linear effects. These models have been implemented in a computer code and numerical simulationsmore » have been carried out for ALS. The model was successfully verified against analytical calculations in cases where they overlap. The non-linear effects from the lattice proved to be important, since they led to a qualitative change of the dynamics for the stored beam. We also studied the injection process in some detail and found that the non-linear effects also fundamentally change the injection dynamics.« less