While, originally, the development of superconducting structures was cleanly divided between low-beta resonators for heavy ions and beta=1 resonators for electrons, recent interest in protons accelerators (high and low current, pulsed and cw) has necessitated the development of structures that bridge the gap between the two. These activities have resulted both in new geometries and in the adaptation of well-known geometries optimized to this intermediate velocity range. Their characteristics and properties are reviewed.

This work was supported by the U.S. DOE Contract No DE-AC05-84-ER40150.

Author: Jean R. Delayen

Submitted for 2001 SRF Workshop, KEK, Tsukuba City, Japan, September 6-11, 2001

Updated August 10, 2001

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