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in creator/contributor: "Kim, K. J."

open access

Tunable Soft X-Ray Oscillators

A concept for a tunable soft x-ray free electron laser (FEL) photon source is presented and studied numerically. The concept is based on echo-enabled harmonic generation (EEHG), wherein two modulator-chicane sections impose high harmonic structure with much greater efficacy as compared to conventional high harmonic FELs that use only one modulator-chicane section. The idea proposed here is to replace the external laser power sources in the EEHG modulators with FEL oscillators, and to combine th… more

Date: September 17, 2010

Creator: Wurtele, Jonathan; Gandhi, Punut; Gu, X-W; Fawley, William M; Reinsch, Matthia; Penn, Gregory et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

XFEL Oscillator Simulation Including Angle-Dependent Crystal Reflectivity

The oscillator package within the GINGER FEL simulation code has now been extended to include angle-dependent reflectivity properties of Bragg crystals. Previously, the package was modified to include frequencydependent reflectivity in order to model x-ray FEL oscillators from start-up from shot noise through to saturation. We present a summary of the algorithms used for modeling the crystal reflectivity and radiation propagation outside the undulator, discussing various numerical issues releva… more

Date: August 23, 2010

Creator: Fawley, William; Lindberg, Ryan; Kim, K. J. & Shvyd'ko, Yuri