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BE: Beschleunigerphysik

BE 13: Beam Dynamics and Fields II

BE 13.9: Vortrag

Donnerstag, 3. April 2014, 11:45–12:00, ZEU 255

Sextupole magnets for beam break up measurements at the S-DALINAC* — •Marcel Schilling, Michaela Arnold, Mirco Gros, Florian Hug, Lars Jürgensen, Thorsten Kürzeder, and Norbert Pietralla — TU Darmstadt, Darmstadt, Germany

Energy recovery linacs (ERLs) are an emerging type of electron accelerators which can provide very high beam currents at low investment and running costs compared to conventional linacs. The high current densities generate strong fields that on the one hand act back on the beam (space charge forces) and on the other hand excite higher order modes (HOM) inside the accelerator structures. Those HOMs interact with the beam and excite beam oscillations that deteriorate beam quality and can lead to beam break up (BBU) in the worst case limiting the maximum achievable beam current in cw operation .

Avoiding BBU is investigated theoretically within simulations by several groups world-wide resulting in different strategies. In this talk we will focus on the idea of using the natural chromaticity in the beam transport system to delete the correlation of HOMs and electrons within the bunch in order to increase BBU threshold currents [1]. For that purpose test experiments at the superconducting recirculating electron accelerator S-DALINAC will be performed. As the natural chromaticity of the S-DALINAC beam transport system is rather low, new sextupoles had to be designed for this project. We will report on the properties of these sextupoles and the upcoming experiment.

[1] V. Litvinenko, Proc. LINAC’12, Tel Aviv, Israel (2012) 249.

*Work supported by BMBF through 05K13RDA