BUNCH COMPRESSOR FOR INTENSE PROTON BEAMS

The Frankfurt Neutron Source FRANZ is under construction at IAP. The ARMADILLO bunch compressor, as a part of it, is composed of a 5 MHz electric kicker, a magnetic dipole chicane and rf-rebunching cavities. The design phase of the bunch compressor has reached the final stage. A 175 MHz 2 MeV proton linac forms 100 ns long beam pulses consisting of nine micro bunches with 150 mA. Deflected by the 5MHz kicker, the micro bunches are guided on different paths to arrive within 1 ns at a n-production target. Due to high space charge forces rebuncher cavities are included. The peak current at the target is expected to be in the range of several amperes in a 1 ns proton pulse, which is equivalent to a longitudinal pulse compression ratio of 45. A new code specific for complex magnetic multi aperture system and for high current applications has been developed. Hardware designs according to the beam dynamics results are in progress. Improved 3D magnetic and electric fields will be applied in the future beam dynamics studies including high space charge forces. The preliminary designs and the beam dynamics studies will be presented in this contribution.