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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 15: Poster session

AKBP 15.9: Poster

Donnerstag, 21. März 2019, 16:30–18:00, Durchgangshalle

Beam Dynamics of the FAIR p-Linac Ladder RFQ — •Marc Syha, Hendrik Hähnel, Ulrich Ratzinger, and Maximilian Schütt — IAP, Goethe University Frankfurt, Germany

The construction of a 3.3 m Ladder-RFQ at IAP, Goethe University Frankfurt, has been finished successfully last summer. This RFQ 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 the parameters modulation, aperture and synchronous phase are varied linearly with cell number, which differs from former designs from IAP Frankfurt. The ratio of transversal vane curvature radius to midcell radial aperture and the vane radius itself are constant to support 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 RFQGen-code was used for beam dynamics simulations. Among those were also error studies, that were performed to test the beam dynamic's stability against input Twiss parameter deviations to a degree indicated by the LEBT measurements performed in Q1/2018 at CEA Saclay with participation of GSI's Ion Source Group. As a next step the RFQ beam dynamics could be successfully reproduced with the TOUTATIS routine of CEAs TraceWin code. This was followed by a thorough investigation of the influence of mechanical errors such as displacements and misalignments on the beam dynamics in form of further TOUTATIS simulations.