Abstract
We demonstrate a novel scheme for imposing or removing large energy chirp on relativistic electron bunches. This method relies on the transverse-to-longitudinal mixing accomplished with a set of transverse deflecting cavities. The working principles of the new concept are explained using the first-order matrix formalism in the approximation of the linear single-particle dynamics. The scheme demonstrates versatility regarding the average beam energy and, hence, positioning along the accelerator beam line. The performance of the scheme is numerically investigated with the elegant particle-tracking code. It is shown that the associated nonlinear effects causing emittance deterioration for the extreme quantities of the total energy spread can be effectively compensated by optimization of the Twiss parameters while relying on the eigenemittance analysis. The impact of the longitudinal space charge effects on the beam dynamics in the proposed scheme is also investigated.
Highlights
Relativistic electron accelerators are used for highenergy physics studies [1,2,3] and as light sources [4,5,6,7,8,9,10,11,12]
These applications require high quality and large peak current electron bunches. Such beams are subject to coherent synchrotron radiation (CSR) [13,14,15,16], which results in the variation of the beam energy along the bunch and degradation of the beam quality
We propose an alternative method for chirping relativistic electron bunches employing transverse-to-longitudinal mixing accomplished by a set of transverse deflecting cavities (TCAVs)
Summary
Relativistic electron accelerators are used for highenergy physics studies [1,2,3] and as light sources [4,5,6,7,8,9,10,11,12] These applications require high quality and large peak current electron bunches. The applications demanding the highest beam quality rely on the linear accelerators [8,9,10,12] which have a smaller number of bending magnets compared to circular accelerators [3] The design of these accelerators includes several bunch compressors (BCs) at different energies for achieving bunches with a large peak current. We propose an alternative method for chirping relativistic electron bunches employing transverse-to-longitudinal mixing accomplished by a set of transverse deflecting cavities (TCAVs). The difference in accelerating fields between two ends of the bunch is determined by its transverse size, which can be made much larger than its length
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