SINGLE SPOKE RESONATOR INNER ELECTRODE OPTIMIZATION DRIVEN BY REDUCTION OF MULTIPOLES
SINGLE SPOKE RESONATOR INNER ELECTRODE OPTIMIZATION DRIVEN BY REDUCTION OF MULTIPOLES
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发表时间：
2013
期刊：
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通讯作者：
P.Berrutti;T.N.Khabiboulline;L.Ristori;N. Solyak;V.P.Yakovlev
中科院分区：
文献类型：
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作者：
P.Berrutti;T.N.Khabiboulline;L.Ristori;N. Solyak;V.P.Yakovlev
Accelerating cavities based on coaxial resonators, half wave and spoke resonators for example, do not have azimuthal symmetry. This lack of symmetry introduces a transverse field perturbation which affects negatively the beam dynamic, since the particles traveling through the structure are crossing two accelerating gaps separated by the inner electrode. The field asymmetry induces an asymmetric transverse momentum gain which, once expanded in multipoles, appears to be due to a quadrupole perturbation. Depending on the cavity geometry and particle velocity, the influence of electric and magnetic fields may vary quite significantly. One solution to obtain symmetric transverse fields in spoke resonators consists in modifying the inner electrode shape from a pole to amore elaborated structure resembling an X or a Y letter shape. The application of these changes symmetrizes both electric and magnetic fields and reduces the multipoles amplitudes to negligible values. This paper presents the study aimed at reducing the multi-pole amplitudes for SSR2 cavity for Project X; the presented procedure, in general, is valid for any spoke cavity.
