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BE: Beschleunigerphysik
BE 10: Beam Dynamics and Fields I
BE 10.8: Talk
Wednesday, April 2, 2014, 16:45–17:00, ZEU 255
A Deflecting Cavity for MESA — •Victor Bechthold — Inst. f. Kernphysik, JGU Mainz, 55128 Mainz, D
Within the framework of the Cluster of Excellence "Precision Physics, Fundamental Interactions and Structure of Matter" (PRISMA) a superconducting energy-recovering accelerator (MESA) will be built at the Institute for Nuclear Physics at the Johannes Gutenberg-University Mainz. The Energy-Recovery-Linac (ERL) accelerator technology allows very high electron-beam luminosities on internal targets at low energies (150 MeV) and provides experiments in particle physics, e.g. the search of the dark photon.
To produce electron bunches that are short enough for further acceleration, electrons emitted by a photocathode have to be cut to a small bunch length. A chopper system likewise the one of the Mainz Microton (MAMI), consisting of two circular deflecting rf-cavities, a slit-collimator with adjustable slith-widh and a solenoid-pair, yields a bunch length of ± 20∘ or less. Further reduces are provided by a following buncher-system.
The circular deflection is realized by a TM110-Cavity operating at MESA frequency 1.3 GHz. In this talk the simulation and optimization of the scaled MAMI chopper-cavity design, calculated with CST Microwave Studio, will be presented, as well as two prototypes build on the improved simulated design. To verify the circular deflection a beam test with the deflector cavity was done.