Superconducting resonator used as a beam phase detector

S. I. Sharamentov; R. C. Pardo; P. N. Ostroumov; B. E. Clifft; G. P. Zinkann

doi:10.1103/PhysRevSTAB.6.052802

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Superconducting resonator used as a beam phase detector

S. I. Sharamentov, R. C. Pardo, P. N. Ostroumov, B. E. Clifft, G. P. Zinkann

DOI 10.1103/PhysRevSTAB.6.052802 · Physical Review Special Topics - Accelerators and Beams

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Abstract

Beam-bunch arrival time has been measured for the first time by operating superconducting cavities, normally part of the linac accelerator array, in a bunch-detecting mode. The very high Q of the superconducting cavities provides high sensitivity and allows for phase-detecting low-current beams. In detecting mode, the resonator is operated at a very low field level comparable to the field induced by the bunched beam. Because of this, the rf field in the cavity is a superposition of a “pure” (or reference) rf and the beam-induced signal. A new method of circular phase rotation (CPR), allowing extraction of the beam phase information from the composite rf field was developed. Arrival time phase determination with CPR is better than 1° (at 48 MHz) for a beam current of 100 nA. The electronics design is described and experimental data are presented.