Document Type

Article

Publication Date

2016

DOI

10.1103/PhysRevAccelBeams.19.052801

Publication Title

Physical Review Accelerators and Beams

Volume

19

Issue

5

Pages

052801 (1-10)

Abstract

A compact, harmonically resonant cavity with fundamental resonant frequency 1497 MHz was used to evaluate the temporal characteristics of electron bunches produced by a 130 kV dc high voltage spin-polarized photoelectron source at the Continuous Electron Beam Accelerator Facility (CEBAF) photoinjector, delivered at 249.5 and 499 MHz repetition rates and ranging in width from 45 to 150 picoseconds (FWHM). A cavity antenna attached directly to a sampling oscilloscope detected the electron bunches as they passed through the cavity bore with a sensitivity of ∼1  mV/μA . The oscilloscope waveforms are a superposition of the harmonic modes excited by the beam, with each cavity mode representing a term of the Fourier series of the electron bunch train. Relatively straightforward post-processing of the waveforms provided a near-real time representation of the electron bunches revealing bunch-length and the relative phasing of interleaved beams. The noninvasive measurements from the harmonically resonant cavity were compared to measurements obtained using an invasive RF-deflector-cavity technique and to predictions from particle tracking simulations.

Comments

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Original Publication Citation

Roberts, B., Hannon, F., Ali, M. M., Forman, E., Grames, J., Kazimi, R., . . . Speirs, D. (2016). Harmonically resonant cavity as a bunch-length monitor. Physical Review Accelerators and Beams, 19(5), 052801. doi:10.1103/PhysRevAccelBeams.19.052801

Download

Share

COinS