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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 10: Instrumentation and Beam Diagnostics II

AKBP 10.5: Talk

Wednesday, March 20, 2024, 18:15–18:30, E 020

Bunch-Length Measurement System Downstream the Injector of the S-DALINAC* — •A. Brauch, M. Arnold, M. Dutine, J. Enders, R. Grewe, L. Jürgensen, N. Pietralla, F. Schliessmann, and D. Schneider — Technische Universität Darmstadt, Department of Physics, Institute for Nuclear Physics, Schlossgartenstr. 9, 64289 Darmstadt, Germany

The S-DALINAC is a thrice-recirculating electron accelerator with a continuous-wave beam at a frequency of 2.9972 GHz that can be operated [1] as a twice-recirculating energy-recovery linac. Optimization of the bunch length downstream the injector is necessary to improve beam quality in regular operation as well as in energy-recovery mode. Currently, measurements of this beam parameter are accomplished by using the radio-frequency zero-crossing method. Since this method is time consuming and inaccurate, a new setup for these measurements using a streak camera is developed. Optical transition radiation from an aluminum-coated Kapton target is used to map the bunch length information to a light pulse which enables a precise measurement compared to a scintillating screen. The light pulse can then be evaluated with the streak camera. The device will be prepared for being useable at two different measurement setups downstream the injector. This contribution will present the design and the current status of the measurement setup as well as its properties.

[1] F. Schliessmann et al., Nat. Phys. 19, 597-602 (2023).

*Work supported by the State of Hesse (Cluster Project ELEMENTS, Project ID 500/10.006) and by DFG (GRK 2128 AccelencE).

Keywords: S-DALINAC; energy-recovery; ERL; Bunch Length; Streak Camera