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Generation of angular-momentum-dominated electron beams from a photoinjector

  • Author(s): Sun, Yin-E.;
  • Piot, Philippe;
  • Kim, Kwang-Je;
  • Barov, Nikolas;
  • Lidia, Steven;
  • Santucci, James;
  • Tikhoplav, Rodion;
  • Wennerberg, Jason
  • et al.
Abstract

Various projects under study require an angular-momentum-dominated electron beam generated by a photoinjector. Some of the proposals directly use the angular-momentum-dominated beams (e.g. electron cooling of heavy ions), while others require the beam to be transformed into a flat beam (e.g. possible electron injectors for light sources and linear colliders). In this paper, we report our experimental study of an angular-momentum-dominated beam produced in a photoinjector, addressing the dependencies of angular momentum on initial conditions. We also briefly discuss the removal of angular momentum. The results of the experiment, carried out at the Fermilab/NICADD Photoinjector Laboratory, are found to be in good agreement with theoretical and numerical models.

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