Dresden 2026 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 14: RF Cavities II

AKBP 14.1: Talk

Thursday, March 12, 2026, 15:00–15:15, SCH/A117

Development and Realization of a new Chopper Cavity for the S-DALINAC* — •Vincent Pruy, Arnold Michaela, Ruben Grewe, Katharina E. Ide, Lars Jürgensen, Lisa Dingeldein, Clemens M. Nickel, Norbert Pietralla, and Dominic Schneider — Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany

The operation of the superconducting radio-frequency cavities of the S-DALINAC [1] relies on a bunched electron beam. Currently, the continuous beam generated by the thermionic gun is divided into bunches using a chopper system incorporating a single deflecting cavity. However, this system induces nonlinear curvatures in the beam trajectory. A second, identically constructed deflecting cavity can be employed to re-bend the beam thus counteracting the nonlinear distortions. Comprehensive electromagnetic and particle-tracking simulations aimed at optimizing the cavitiy's deflection behavior and quality factor have already been completed. This work further concluded the in-house fabrication of the cavity and its commissioning in the injector beamline of the S-DALINAC. In this contribution, we report on the manufacturing process and the measured properties of the cavity. In addition, we propose a viable concept realizing a double chopper system based on the existing components.

[1] N. Pietralla, Nucl. Phys. News, Vol. 28, No. 2, 4 (2018).

*This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) * Project-ID 499256822 * GRK 2891 'Nuclear Photonics'.

Keywords: Chopper; Cavity; Commissioning; Manufacturing; S-DALINAC