IAP, Frankfurt am Main
There is an increasing interest world wide in proton and ion linear accelerators for the low and medium energy range. Many of these accelerators will be operated at high duty cycles up to 100%. Superconducting cavities are favourable or sometimes even technologically necessary. Using conventional low beta cavities (quarter wave, half wave) leads to a large number of cavities and sub-systems because of the small number of accelerating cells per cavity. The recently developed superconducting CH-cavity is the first multi-cell cavity for low beta applications. A prototype cavity (19 cells, beta=0.1) has been tested with effective gradiends of 7 MV/m. Presently two optimized CH-cavities are under construction (beta=0.15, 325 MHz, 7-cell and beta=0.059, 217 MHz, 15 cells). Both cavities will be fully equipped with cryo-module, tuning systems and high power couplers. It is planned to test both cavities with beam at GSI, Darmstadt. The talk covers the development of the superconducting CH-cavity, different applications and fututre plans.
IAP, Frankfurt am Main
The CH-structure (Crossbar-H-mode) is a superconducting cavity for the low and medium energy range operated in the H21-mode. Due to its well designed geometry and by using the special KONUS (KOmbinierte NUll Grad Struktur) beam dynamics the superconducting CH-cavity is an excellent candidate for the efficient acceleration in high power proton and ion accelerators. One of many possible applications for this kind of superconducting RF cavity is the EUROTRANS project (EUROpean Research Programme for the TRANSmutation of High Level Nuclear Waste in an Accelerator Driven System, 600 MeV, 352 MHz). A prototype cavity has been developed and tested successfully with a gradient of 7 MV/m. At present a new superconducting CH-cavity with improved geometry for high power applications is under construction. The status of the cavity development related to EUROTRANS is presented.
