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TY - UNPB AU - Winklehner, D. ED - Conradie, Lowry ED - De Villiers, John Garrett ED - Schaa, Volker RW TI - Beam dynamics and preliminary design of the RFQ Direct Injection Project J2 - Proc. of Cyclotrons2019, Cape Town, South Africa, 23-27 September 2019 CY - Cape Town, South Africa T2 - International Conference on Cyclotrons and their Applications T3 - 22 LA - english AB - Injecting beam into a compact cyclotron from an external ion source usually requires a low energy beam transport line (LEBT) with several beam shaping elements (magnets and a buncher), the transfer through the cyclotron axial bore hole, and finally, bending the beam into the median plane using a spiral inflector. In the RFQ Direct Injection Project we are combining LEBT, buncher, and axial transfer within one element, the RFQ (Radio Frequency Quadrupole), which is inserted axially into the cyclotron yoke. This is a very compact solution that offers an excellent bunching efficiency. To accommodate the small diameter that is available in the axial bore hole together with a low RF frequency of 32.8 MHz, a split-coaxial RFQ type was chosen. Longitudinal and transverse de-bunching are mitigated by an internal re-bunching cell, and an external electrostatic quadrupole, respectively. The preliminary design phase of this project has been concluded and the RFQ is currently under construction at Bevatech GmbH in Germany. Here, we present the beam dynamics simulations, showing the feasibility of the system, and the preliminary design of the RFQ and test cyclotron with central region. PB - JACoW Publishing CP - Geneva, Switzerland ER -