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Experimental observation of wiggler superradiance under group synchronism condition

Ginzburg, N S and Peskov, N Y and Zotova, I V and Sergeev, A S and Phelps, A D R and Cross, A W and He, W and Ronald, K and Shpak, V G and Yalandin, M I and Shunailov, S A and Ulmaskulov, M R (1999) Experimental observation of wiggler superradiance under group synchronism condition. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 429 (1-3). pp. 94-100. ISSN 0168-9002

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The first results of the observation of superradiance from a single, subnanosecond, high current, electron bunch passing through a wiggler immersed in a guide magnetic field are presented. The 300-500 ps microwave pulses were generated in the high gain regime for both the conventional and reverse directions of the guide magnetic field. The dependence of the radiation power on the interaction length as well as the absolute value of the power, 100-200 kW, were related with the development of self-bunching and consequently with coherent emission.