Gain in planar wiggler free electron lasers

B. W J McNeil, W J Firth

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We present a detailed derivation of the Bessel function factor in the gain/pendulum expressions for a planar wiggler FEL. We show three individually nonnegligible corrections to the standard derivation of Colson (IEEE J. Quantum Electron. QE-17 (8) (1981) 1417). All three corrections however cancel and give the "standard" Bessel function factor of Colson. The gain of a sectional planar wiggler, is investigated for a variation in the deflection parameter, K, in one of its sections. Results produced are compared with and are in good agreement with experiment. © 1987.

Original languageEnglish
Pages (from-to)240-244
Number of pages5
JournalNuclear Inst. and Methods in Physics Research, A
Issue number1-2
Publication statusPublished - 1 Sept 1987


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