Phys. Rev. ST Accel. Beams 10, 104201 (2007) [7 pages]Criteria for emittance compensation in high-brightness photoinjectors
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. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevSTAB.10.104201
DOI:
10.1103/PhysRevSTAB.10.104201
PACS:
29.27.Bd, 41.75.−i, 41.85.−p, 29.25.Bx
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