The IH Cavity for HITRAP

RFQs are already successfully used to decelerate ions and to match them to ion traps. Within the Heavy Ions TRAP project HITRAP at GSI a combination of an IH drift tube cavity operating at the H11(0) mode and a 4-rod RFQ is proposed to decelerate the 1 μs long heavy ion bunches (up to U) from 4 A⋅MeV to 6 A keV after storage ring extraction. The transition energy from the IH into the RFQ is 0.5AmeV. The operating frequency is 108.408 MHz. The A/q range of the linac is up to 3. A 4-gap quarter wave resonator working at 108.408MHz provides the micro bunch structure for the IH. The transmission mainly defined by the buncher is about 30%. An alternative 2 harmonic bunching section, which allows higher transmission and/or smaller longitudinal emittance, will be discussed. By applying the KONUS dynamics, the 2.7 meter long IH cavity will perform a high efficient deceleration by up 10.5 MV with 200kW rf power. The beam dynamics performed with the LORASR simulation code will be shown. It is aimed to reach an effective shunt impedance around 220MΩ/m for the IH cavity.