Abstract
The applicability of superconducting TEM-class spoke cavities to high-energy ion linacs is discussed, and detailed designs for two TEM-class, triple-spoke-loaded superconducting niobium resonant cavities are presented. The 345 MHz cavities have a velocity range of $0.4<\ensuremath{\beta}<0.75$ and a beam aperture of 4 cm. Spoke-loaded cavities offer several advantages compared with the higher-frequency elliptical-cell cavities that are currently being developed for this range of particle velocities. The proposed triple-spoke cavities can provide broader velocity acceptance, more accelerating voltage per cavity, reduced heat-load operation at 4.2 K, and increased longitudinal acceptance through the high-energy section. Application to the proposed U.S. rare-isotope accelerator driver linac is discussed in detail.
Highlights
In the first part of this paper we compare in general terms the properties of TEM-class, transmission-lineloaded resonant cavities with the properties of TM-class elliptical-cell cavities.We describe in some detail the design and properties of two types of three-spoke-loaded TEM-class superconducting (SC) niobium cavities [1,2,3] intended for use in a high-energy SC ion linac
We compare the operational characteristics of these cavities with two 805 MHz TM-class elliptical-cell cavities, one of which has been developed for the proton driver linac for the U.S SNS project [4] and another which is being developed for the project described below
We examine in detail application of the spoke cavities to the high-energy section of the driver linac for the proposed U.S rare-isotope accelerator facility (RIA) [5,6]
Summary
In the first part of this paper we compare in general terms the properties of TEM-class, transmission-lineloaded resonant cavities with the properties of TM-class elliptical-cell cavities. We compare the operational characteristics of these cavities with two 805 MHz TM-class elliptical-cell cavities, one of which has been developed for the proton driver linac for the U.S SNS project [4] and another which is being developed for the project described below. The RIA driver is required to produce uranium beams at 400 MeV per nucleon and, beams of lighter ions at as high an energy as possible. To meet these requirements with a present state-of-the-art ion source, the linac must accelerate multiple-chargestate beams of the heaviest ions, which requires large longitudinal acceptance. For both of these requirements the low operating frequency of spokeloaded cavities can provide new and beneficial design options
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