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  • Open Access

Criteria for emittance compensation in high-brightness photoinjectors

Chun-xi Wang* and Kwang-Je Kim

Massimo Ferrario

An Wang†

  • Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA

  • INFN-Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati, Italy

  • University of Science and Technology of China, Hefei, China

  • *wangcx@aps.anl.gov; http://www.aps.anl.gov/~wangcx
  • †Visiting student of Argonne National Laboratory.
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Phys. Rev. ST Accel. Beams 10, 104201 – Published 3 October, 2007

DOI: https://doi.org/10.1103/PhysRevSTAB.10.104201

Abstract

A critical process in high-brightness photoinjectors is emittance compensation, which brings under control the correlated transverse emittance growth due to the linear space-charge force. Although emittance compensation has been used and studied for almost two decades, the exact criteria to achieve emittance compensation is not as clear as it should be. In this paper, a perturbative analysis of slice envelopes and emittance evolution close to any reference envelope is developed, via which space-charge and chromatic effects are investigated. A new criterion for emittance compensation is found, which is complementary to the well-known matching condition for the invariant envelope and agrees very well with simulations.

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References (12)

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Phys. Rev. ST Accel. Beams 10, 104201– Published 3 October, 2007
  • Received 2 July 2007
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