Mainz 2022 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 13: Diagnostics, Control and Instrumentation 2

AKBP 13.7: Talk

Thursday, March 31, 2022, 15:30–15:45, AKBP-H13

Bunch Length Measurement Systems at S-DALINAC — •A. Brauch, M. Arnold, J. Enders, L. Jürgensen, N. Pietralla, and S. Weih — Technische Universität Darmstadt, Darmstadt, Deutschland

Precision experiments at the superconducting Darmstadt electron linear accelerator S-DALINAC require a high-quality beam. Next to other important beam parameters, an optimization of the bunch length to typical values of 0.7 to 2 ps is performed. This is accomplished by inducing a linear momentum spread on the bunch in one of the accelerating cavities. The bunch length can be measured with a target in a dispersive section downstream. This method is time consuming and can provide only an upper limit of the bunch length. Therefore, two new setups for bunch length measurements are introduced. They will improve the optimization process significantly. A new diagnostic beam line is set up in the low energy beam area. It includes a deflecting copper cavity used for measuring the bunch length by rotating the bunch and projecting its length on a target. A streak camera placed at different positions downstream the injector and the main accelerator will be used to measure the bunch length in the future. The device will analyse optical transition radiation from an aluminium coated kapton target. The pulse length of the emitted light is equal to the length of the bunch creating it. This contribution will present the layout of both systems, their current status and design considerations.