The FEL SASE operation, bunch compression and the beam heater
G. Dattoli, M. Labat, M. Migliorati, P. L. Ottaviani, S. Pagnutti and, E. Sabia
TL;DR
This paper analyzes the optimal conditions for SASE FEL operation using bunch compression techniques, focusing on velocity and magnetic compression, and estimates laser heater power needed to suppress micro-bunching instability.
Contribution
It provides a quantitative analysis of laser heater power requirements to suppress micro-bunching in SASE FELs with bunch compression.
Findings
Laser heater power can effectively suppress micro-bunching instability.
Magnetic bunch compression requires specific laser heater settings.
Optimal FEL operation depends on balancing bunch compression and heater power.
Abstract
We discuss the conditions required for an optimal SASE FEL operation when bunch compression techniques are exploited to enhance the bunch peak current. We discuss the case of velocity bunching and magnetic bunch compression. With the reference to the latter technique we provide a quantitative estimate of the amount of laser heater power necessary to suppress the micro-bunching instability without creating any problem to the SASE dynamics
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