niobium quarter-wave resonator development for a heavy ion re ...

Cavity Design
The quarter-wave resonators developed by Legnaro
for ALPI and PIAVE are the basis for the design
of the QWR for the reaccelerator. A slightly larger
aperture is used for the reaccelerator cavities. Another
differences is separation of the cavity vacuum
from the insulation vacuum to reduce particulate
contamination of the cavity surfaces.
• Shorting plate is formed from sheet Nb (3 mm
thick) (similar to Argonne design) instead of
being machined.
• Tuning plate (1.25 mm thick) is slotted to reduce
the tuning force (similar to TRIUMF design).
• Probe couplers are attached to the bottom flange
(same as β = 0.085 prototype).