H. Bongers, S. Emhofer, D. Habs, O. Kester, T. Sieber (Physik LMU Munich) U. Ratzinger, A. Schempp (IAP, Uni Frankfurt)
The linear accelerator for the new Munich high flux reactor FRM II (MAFF) which is under design [1,2] will deliver intense beams of very neutron-rich fission fragments of up to 10^12 particles per second with final energies between 3.7 and 5.9 MeV/u in order to perform experiments for the production of long living heavy elements . In order to obtain an efficient acceleration in a short LINAC charge breeding of the 1+ ion beam from the reactor to a q/A ~ 0.15 - 0.2 and bunching of the continuously produced radioactive ions according to the duty cycle of 10% are required. The overall length of the LINAC is restricted to 20 m. Thus structures with high shunt impedances and high effective accelerating field like the IH-structure will be used to reach energies at the Coulomb barrier. In order to reach a high flexibility in the final energy with only two small cavities the properties of 7-gap IH-structures are under examination at the Munich tandem laboratory and will be presented.
 O. Kester, D. Habs et al., Nucl. Instr. and Meth. B 139 (1998) 28
 Munich Accelerator for Fission Fragments (MAFF), Physics case and technical description, ed. by D. Habs et al., October 1998
 P. Thirolf, D. Habs et al., Nucl. Instr. and Meth. B 126 (1997) 242
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