Measurement of bunch length and temporal distribution using accelerating radio frequency cavity in low-emittance injector.

Abstract:

:We demonstrate an experimental methodology for measuring the temporal distribution of pico-second level electron bunch with low energy using radial electric and azimuthal magnetic fields of an accelerating ([Formula: see text] mode) radio frequency (RF) cavity that is used for accelerating electron beams in a linear accelerator. In this new technique, an accelerating RF cavity provides a phase-dependent transverse kick to the electrons, resulting in the linear coupling of the trajectory angle with the longitudinal position inside the bunch. This method does not require additional devices on the beamline since it uses an existing accelerating cavity for the projection of the temporal distribution to the transverse direction. We present the theoretical basis of the proposed method and validate it experimentally in the compact-energy recovery linac accelerator at KEK. Measurements were demonstrated using a 2-cell superconducting booster cavity with a peak on-axis accelerating field ([Formula: see text]) of 7.21 MV/m.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Hwang JG,Miyajima T,Honda Y,Kim ES

doi

10.1038/s41598-020-76054-w

subject

Has Abstract

pub_date

2020-11-03 00:00:00

pages

18905

issue

1

issn

2045-2322

pii

10.1038/s41598-020-76054-w

journal_volume

10

pub_type

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