Abstract
The aim of this paper is to investigate the effect of the magnetic bunch length compression on the development of the microbunching instability. It will be shown that, after removing the linear energy chirp required for the compression, an additional and properly tuned ${R}_{\mathbf{56}}$ transport matrix element is able to dilute the initial energy modulation and to suppress the current spikes created by the microbunching instability without affecting the bunch length. A by-product of the study is the observation that a single compressor is more effective than the two-compressors scheme in reducing the unwanted modulations caused by the microbunching instability. The study is based on analytical calculations and on the simulation code elegant.
Highlights
Linacs for the free electron laser (FEL) typically involve at least two magnetic chicanes, here called BC1 and BC2, for the bunch length compression; this scheme provides the flexibility needed to manipulate the current profile in order to satisfy the requirement of a high FEL power [1,2,3].this scheme works like a powerful amplifier of any small initial energy or density modulation, driving the so-called microbunching instability [4,5,6,7]
It will be shown that, after removing the linear energy chirp required for the compression, an additional and properly tuned R56 transport matrix element is able to dilute the initial energy modulation and to suppress the current spikes created by the microbunching instability without affecting the bunch length
An energy modulation induced by longitudinal space charge (LSC) [8,9,10,11] upstream of the compressor is converted by the chicane dispersive path into density modulation
Summary
Linacs for the free electron laser (FEL) typically involve at least two magnetic chicanes, here called BC1 and BC2, for the bunch length compression; this scheme provides the flexibility needed to manipulate the current profile in order to satisfy the requirement of a high FEL power [1,2,3]. This scheme works like a powerful amplifier of any small initial energy or density modulation, driving the so-called microbunching instability [4,5,6,7]. This chicane does not add any further compression, but it is effective in damping the microbunching instability
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