R. Eichhorn and U. Ratzinger (GSI, Planckstr. 1, 64291 Darmstadt, Germany)
Room temperature IH-type drift tube structures are used at different places now for the acceleration of ions with mass over charge ratios as high as 65 and velocities between 0.016 c and 0.1 c. These structures have a high shunt impedance and allow the acceleration of very intense beams at high accelerating gradients. The overall power consumption of room temperature IH-mode structures is quite close to superconducting (SC) structures up to 2 MeV/u. With the KONUS [1] beam dynamics, the required transversal focusing elements, e.g. quadrupole triplets can be placed outside of multicell cavities, which is favourable for building SC H-mode cavities. The design principles and consequences to the geometry compared to room temperature cavities will be described. The results gained from numerical simulations show that a SC multi gap H210-mode cavity (CH-type) can be an alternative to the SC spoke-type or reentrant cavity structures up to beam energies around 130 MeV/u. The main cavity parameters and possible fabrication options will be discussed.
[1] U. Ratzinger, Nucl. Intr. Meth., A 415 (1998) 229.
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