| | Superconducting (SC) TEM-class spoke cavities are
required for proposed cw and pulsed ion linac applications
world-wide. Several laboratories and institutions have
demonstrated high field performance (Epeak>30 MV/m)
in single- and multi-spoke geometries for use with ions
over the full mass range and for velocities 0.15 < v/c < 0.8.
Recent results show spoke cavities, previously designed
for 4 Kelvin operation, now operate with better efficiency
at 2 Kelvin, resulting in large part from performance gains
due to techniques such as clean assembly and hydrogen
degassing. Low Rf losses even for high accelerating fields
(corresponding to Epeak~30 MV/m) required in
operations have been achieved. The status of recent spoke
cavity activities at several laboratories is presented. | |
