Ladder resonator: A novel superconducting structure for the very low part of high current linacs
V. Andreev, G. Bisoffi, A. Pisent, E. Bissiato, M. Comunian, E. Fagotti, and T. Shirai
Phys. Rev. ST Accel. Beams 6, 040101 (2003) - Published 22 April, 2003