Low Power Measurements on a Finger Drift Tube Linac

Kühnel, K.; Schempp, A.; Welsch, C.

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Low Power Measurements on a Finger Drift Tube Linac

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Kühnel, K.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Welsch, C.
Carsten Welsch - Helmholtz University Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Linac2004_Kuehnel_Welsch.pdf
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Citation

Kühnel, K., Schempp, A., & Welsch, C. (2004). Low Power Measurements on a Finger Drift Tube Linac. In Proceedings of LINAC 2004 (pp. 854-856).

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8D66-E

Abstract

The efficiency of RFQs decreases at particle energies higher than a few MeV/u and thus typically DTL structures are used in this energy region. However, the rf field in the gap always has a defocusing influence on the beam. In order to compensate this effect, fingers with quadrupole symmetry were added to the drift tubes, the focusing fingers do not need an additional power source or feed through. Beam dynamics have been studied with the code RFQSIM. Detailed analysis of the field distribution was done and the geometry of the finger array has been optimized with respect to beam dynamics. A prototype cavity with finger drift tubes was built and low power measurements were done. In this contribution, the results of the rf simulation with Microwave Studio are compared to bead perturbation measurements and the focusing effect on the beam is discussed.