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 [3]. 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.
[1] O. Kester, D. Habs et al., Nucl. Instr. and Meth. B 139 (1998) 28
[2] Munich Accelerator for Fission Fragments (MAFF), Physics case and technical description, ed. by D. Habs et al., October 1998
[3] P. Thirolf, D. Habs et al., Nucl. Instr. and Meth. B 126 (1997) 242
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