4.4 Article

Compact spectrometer for photon diagnostics of the extreme-ultraviolet free-electron-laser radiation

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ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2010.11.004

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Grazing-incidence spectrometer; Free-electron-laser; Extreme-ultraviolet

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It is here discussed the design and the characterization of a compact spectrometer to be used at the FLASH facility (DESY, Hamburg) to acquire the spectral features of the free-electron-laser radiation in terms of high-harmonics content and shot-to-shot spectral changes. The instrument is sensitive in the 2-40 nm spectral region and very compact to be used in different beamlines. The optical design consists of an entrance slit, a spherical diffraction grating with variable groove spacing and an extreme-ultraviolet-enhanced CCD detector. The entire spectral range is covered by two interchangeable gratings installed on a rotating stage. (C) 2010 Elsevier B.V. All rights reserved.

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