Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 475, Issue 1-3, Pages 357-362Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0168-9002(01)01539-X
Keywords
free electron laser; X-ray laser; SASE; X-ray monochromator; mossbauer radiation
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A new design for a single pass X-ray Self-Amplified Spontaneous Emission (SASE) FEL was proposed by Feldhaus et al. (Opt. Commun. 140 (1997) 341) and named two-stage SASE FEL. The scheme consists of two undulators and an X-ray monochromator located between them. For the Angstrom wavelength range the monochromator can be realized using Bragg reflections from crystals. We propose a scheme of monochromator with a bandwidth of 20 meV for the 14.4 keV X-ray SASE FEL being developed in the framework of the TESLA linear collider project. The spectral bandwidth of the radiation from the two-stage SASE FEL (20 meV) is determined by the finite duration of the electron pulse. The shot-to-shot fluctuations of energy spectral density are dramatically reduced in comparison with the 100% fluctuations in a SASE FEL. The peak and average brilliance are three orders of magnitude higher than the values which could be reached by a conventional X-ray SASE FEL. (C) 2001 Elsevier Science B.V. All rights reserved.
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