CST – Computer Simulation Technology

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 [1] 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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