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  Hoberg, H.G. ; Anders, W. ; Heugel, A. ; Klauke, S. ; Mielczarek, G. ; Westphal, Th.: Highly Stable IOT Based 1.3 GHz/ 16 KW RF Power Source for CW Operated SC Linacs, Proceedings of SRF 2009. In: Proceedings SRF 2009, 14th International Conference on RF Superconductivity, DBB Forum, Berlin September 20 - 25, 2009Berlin: Helmholtz-Zentrum, 2009 (HZB-Bericht 2), p. 679-682

Abstract:
Most proposals of fourth generation light sources are based on CW operated sc linacs used in a FEL or ERL [1], [2], [3], [4], [5]. The requirements for the stability of the RF field in the cavities are better than 0.1 deg phase and better than 0.1% amplitude. The required RF power is strongly amplitude modulated due to the fact, that microphonic effects in the sc cavities play an important role. At the HZB a modular RF transmitter was developed with FuG, that can be used for IOT tubes for different power levels and frequencies. Attention was taken to the stability in the case of AM modulation.