Würzburg 2018 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 8: Poster session

AKBP 8.12: Poster

Wednesday, March 21, 2018, 18:00–19:30, NW-Bau - HS2

Beam Dynamics for the FAIR-p-Linac-RFQ — •Marc Syha, Maximilian Schütt, and Ulrich Ratzinger — Institut für Angewandte Physik, Goethe-Universität Frankfurt, Deutschland

After the successful measurements with a 0.8 m prototype a 3.3 m Ladder-RFQ is under construction at IAP, Goethe University Frankfurt. It is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the p-Linac at FAIR. Along the acceleration section modulation parameter, aperture and synchronous phase all course linear, which differentiates this design approach from other designs developed at IAP. The ratio of transversal vane curvature radius to mid-cell radial aperture as well as the vane radius itself are constant, which favors a flat voltage distribution along the RFQ. This was verified by implantation of the modulated vane geometry into MWS-CST RF field simulations*.

The development of adequate beam dynamics was done in close collaboration with the IAP resonator design team. The Los Alamos RFQGen-code was used for the RFQ design and the beam dynamics simulations.

Furthermore, the effects of and the compensation for the longitudinal on-axis fringe-fields at the gap between the grounded entrance flange and the electrode entrance plane are discussed*.

*M. Schütt, Design and Development of a 325 MHz Ladder RFQ, Dissertation, IAP Goethe-Universität Frankfurt, 2017.