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Observation of coherent and self-amplified spontaneous emission with the clio free-electron laser

Prazeres, R. and Ortega, J.M. and Glotin, F. and Jaroszynski, D.A. (1998) Observation of coherent and self-amplified spontaneous emission with the clio free-electron laser. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 407 (1-3). pp. 474-479. ISSN 0168-9002

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Abstract

We have produced and analysed the 'Coherent Spontaneous Emission' (CSE) and the 'Self-Amplified Spontaneous Emission' (SASE) emitted by a relativistic electron beam passing through an undulator. In this spectral range, the two phenomena are both very noisy and very sensitive to the electron bunch shape. As a consequence, it is difficult to distinguish one from the other, at least when SASE is restricted to the beginning of the build-up regime. We present new measurements, showing how these two regimes differ in their spectral evolution.