| Paper |
Title |
Page |
| TH1004 |
A 70-MeV Proton Linac for the FAIR Facility Based on CH - Cavities
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526 |
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- U. Ratzinger, G. Clemente, C. Commenda, H. Liebermann, H. Podlech, R. Tiede
IAP, Frankfurt-am-Main
- W. Barth, L. Groening
GSI, Darmstadt
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Future Accelerators for fundamental and for applied research will need a significant improvement in injector capabilities. This paper will describe the concept and the status of the 70 MeV, 70 mA proton injector for GSI - FAIR and compare the CH - linac design with traditional DTL concepts. Improvements in the space charge routine of the LORASR code as well as CH - prototype cavity development and cavity grouping with respect to commercial 3 MW rf power amplifiers is reported. Additionally, the potential of robust superconducting low and medium energy high current linac sections will be explained on the basis of experimental results from a first 19 cell s.c. 350 MHz CH - prototype cavity.
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| THP067 |
Status of the Tuner for the 19-Cell Superconducting CH Prototype Cavity
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737 |
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- C. Commenda, H. Liebermann, H. Podlech, U. Ratzinger, A. C. Sauer
IAP, Frankfurt-am-Main
- K. Dermati
GSI, Darmstadt
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The radio frequency tuning of the multi-cell superconducting CH structure for beta equal to 0.1 is investigated for a 19-cell niobium cavity operated at liquid helium temperature. By applying external mechanical forces the deformation of the structure is studied and the resulting change in frequency is analysed. The ruling equations of elasticity and the electromagnetic eigenvalue problem are solved by using commercial finite element tools. The quantitative results form the basis of an optimized tuning device. In order to guarantee a long lifetime of the cavity, fracture criteria are defined to avoid mechanical damage. Wherever possible the results are compared with experimental data obtained from measurements performed on the first CH prototype developed at the Institute of Applied Physics at Frankfurt. In addition a fast piezo device will be integrated into the slowly acting mechanical tuner. The whole system will operate in an existing horizontal cryostat for testing purposes.
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