Coupler development and gap field analysis for the 352 MHz superconducting CH-Cavity*
H. Liebermann, H. Podlech, U. Ratzinger, A. Sauer,
Institut für Angewandte Physik, Frankfurt, Germany
1st January 0001
The cross-bar H-type (CH) cavity is a multi-gap drift tube structure based on the H-210 mode currently under development at IAP Frankfurt and in collaboration with GSI. Numerical simulations and rf model measurements showed that the CH-type cavity is an excellent candidate to realize s.c. multi-cell structures ranging from the RFQ exit energy up to the injection energy into elliptical multi-cell cavities.
A 19-cell, beta=0.1, 352 MHz, bulk niobium prototype cavity is under fabrication at the ACCEL-Company, Bergisch- Gladbach. This paper will present detailed MicroWave Studio  simulations and rf model measurements for the coupler development of the 352 MHz superconducting CHcavity. It describes possibilities for coupling into the superconducting CH-cavity. First results of the measurements
of different coupler concepts, e.g. capacitive and inductive coupling at different positions of the CH-cavity are reported. Additionally the rf quadrupole content in CH-type gaps was investigated quantitatively.
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