An Analysis of Shot Noise Propagation and Amplification in Harmonic Cascade FELs
نویسندگان
چکیده
The harmonic generation process in a harmonic cascade (HC) FEL is subject to noise degradation which is proportional to the square of the total harmonic order. In this paper, we study the shot noise evolution in the first-stage modulator and radiator of a HC FEL that produces the dominant noise contributions. We derive the effective input noise for a modulator operating in the low-gain regime, and analyze the radiator noise for a density-modulated beam. The significance of these noise sources in different harmonic cascade designs is also discussed. Contributed to the 28th International Free Electron Laser Conference Berlin, Germany August 27 September 1, 2006 ∗Work supported by Department of Energy contract DE–AC02–76SF00515. An analysis of shot noise propagation and amplification in harmonic cascade FELs Zhirong Huang∗ Stanford Linear Accelerator Center, Stanford, CA 94309, USA Abstract The harmonic generation process in a harmonic cascade (HC) FEL is subject to noise degradation which is proportional to the square of the total harmonic order [1]. In this paper, we study the shot noise evolution in the firststage modulator and radiator of a HC FEL that produces the dominant noise contributions. We derive the effective input noise for a modulator operating in the low-gain regime, and analyze the radiator noise for a density-modulated beam. The significance of these noise sources in different harmonic cascade designs is also discussed.
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