Volkov, V. ; Knobloch, J. ; Matveenko, A.: Dipole High Order Mode Analyses in FZD like SRF Guns. In: Proceedings SRF 2009, 14th International Conference on RF Superconductivity, DBB Forum, Berlin September 20 - 25, 2009Berlin: Helmholtz-Zentrum, 2009 (HZB-Bericht 2), p. 880-882
Abstract:
Dipole High Order Modes (HOM) in a superconducting RF gun (SRF gun) could affect the quality of the electron beam and cause instabilities. The characteristics of dipole HOMs including trapped HOMs are calculated here for a FZD-like SRF gun up to a frequency of 8.0 GHz. Dependence of the calculated parameters on the cavity longitudinal deformation has been studied. A new concept of the HOM damping is proposed that is consistent with the electron beam focusing in the cavity with a high-order TE mode.