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  Volkov, V.; Knobloch, J.; Matveenko, A.: Monopole passband excitation by field emitters in 9-cell TESLA-type cavities. Physical Review Accelerators and Beams 13 (2010), p. 084201/1-6

10.1103/PhysRevSTAB.13.084201

Abstract:
We present an extension of the calculation of dipole-mode driven beam break-up instabilities, as calculated in [V. Volkov, Phys. Rev. ST Accel. Beams 12, 011301 (2009); V. Volkov, J. Knobloch, and A. Matveenko, Phys. Rev. ST Accel. Beams (to be published)], to the monopole fundamental mode passband. The excitation of these modes has been observed in 9-cell TESLA cavities on test stands without beam [G. Kreps et al., Proceedings of SRF2009 (HZB, Berlin, Germany, 2009), pp. 289–291] and the same effect has been observed in klystrons with high DC currents. DOI: 10.1103/PhysRevSTAB.13.084201 PACS numbers: 29.27.Bd, 85.25.
j, 41.85.Ja, 29.20.Ej