Development of Room Temperature and Superconducting CH-Structures for High Power Applications

In the last decades several types of H-mode cavities have been developed for a wide range of applications. Sev-eral drift tube cavities (IH-structure) are in routine opera-tion [1][2]. At the IAP (University of Frankfurt, Germany) a new type of H-mode cavity, the Cross-Bar-H-mode or CH-structure is presently under development. This multi-cell drift tube cavity is operated in the H21(0)-mode. The CH-structure is an excellent candidate for high power pro-ton accelerators in the energy range from 3 to 100 MeV. We present the status of the room temperature (r.t.) CH-cavity development for a dedicated 70 MeV proton injector for the international accelerator facility FAIR at GSI [3]. Due to its mechanical rigidity this cavity can be realized not only for room temperature but also for superconduct-ing (s.c.) operation. To prove the very promising proper-ties of superconducting CH-structures obtained by simula-tions, a 352 MHz prototype CH-cavity has been designed. Presently, this cavity is in the final stage of production. We present recent results of the s.c. cavity development and different applications which could take advantage of the s.c. CH-structure (XADS, IFMIF, cw-linac for the produc-tion of superheavy elements)