Abstract
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 language | English |
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| Pages (from-to) | 240-244 |
| Number of pages | 5 |
| Journal | Nuclear Inst. and Methods in Physics Research, A |
| Volume | 259 |
| Issue number | 1-2 |
| Publication status | Published - 1 Sep 1987 |