Author: Hemsing, E.
Paper Title Page
WEOBB02 Bunch Length Diagnostic with Sub-femtosecond Resolution for High Brightness Electron Beams 1967
 
  • G. Andonian, E. Hemsing, P. Musumeci, J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
  • A.Y. Murokh
    RadiaBeam, Santa Monica, USA
  • D. Xiang
    SLAC, Menlo Park, California, USA
 
  Next generation light sources require electron beams with high peak currents, typically achieved by compression techniques. The temporal diagnosis of these ultra-short beams demands enhanced resolution. We describe a scheme to achieve a temporal resolution on the order of sub-femtoseconds. The scheme is based on encoding the longitudinal profile of the beam on a transverse angular modulation, based on an interaction between the electron beam and a high-power laser in an undulator. This imposes a fast-sweep of the beam, on the order of sub-femtoseconds. A subsequent sweep in the orthogonal dimension by an rf deflecting cavity, imposes a "slow-sweep" on the order of sub-picoseconds. In this paper, we demonstrate applicability of this diagnostic scheme at the BNL ATF and specify the techniques required for practical applicability.  
slides icon Slides WEOBB02 [1.120 MB]  
 
WEPC137 Undulator Radiation Simulation by QUINDI 2316
 
  • D. Schiller, E. Hemsing, J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
 
  QUINDI, a code developed to simulate coherent emission from bending systems, has been upgraded to include undulators as a beamline element. This approach allows us to better model the radiation produced by a relativistic electron bunch propagating through such a device.  
 
THPC101 Fitting Formulas for Space-charge Dominated Free-electron Lasers 3122
 
  • G. Marcus, E. Hemsing, J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
 
  A simple power-fit formula for calculating the gain length of the fundamental Gaussian mode of a free-electron laser having strong space-charge effects in the 3D regime has been obtained. This tool allows for quick evaluation of the free-electron laser performance in the presence of diffraction, uncorrelated energy spread, and longitudinal space-charge effects. Here, we use it to evaluate the performance of high-gain FEL amplifiers considered candidates as high average power light sources. Results are compared with detailed numerical particle simulations using the free-electron laser code Genesis.