Cavity BPM with Dipole-Mode-Selective Coupler
In this paper, we present a novel position sensitive signal pickup scheme for a cavity BPM. The scheme utilizes the H-plane of the waveguide to couple magnetically to the side of the cavity, which results in a selective coupling to the dipole mode and a total rejection of the monopole mode. This scheme greatly simplifies the BPM geometry and relaxes machining tolerances. We will present detailed numerical studies on such a cavity BPM, analyze its resolution limit and tolerance requirements for a nanometer resolution. Finally present the measurement results of a X-band prototype.
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- Conference: Presented at Particle Accelerator Conference (PAC 03), Portland, Oregon, 12-16 May 2003
- Research Org:
- Stanford Linear Accelerator Center (SLAC)
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- United States
- 43 PARTICLE ACCELERATORS; ACCELERATORS; DIPOLES; GEOMETRY; MACHINING; MONOPOLES; RESOLUTION; TOLERANCE; WAVEGUIDES Accelerators,ACCPHY, ACCSYS
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