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| Journal Article | DESY-2014-01731 |
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2013
APS
College Park, Md.
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Please use a persistent id in citations: doi:10.1103/PhysRevLett.111.034802
Abstract: We present measurements of second- and higher-order intensity correlation functions (so-calledHanbury Brown—Twiss experiment) performed at the free-electron laser (FEL) FLASH in the non-linearregime of its operation. We demonstrate the high transverse coherence properties of the FEL beam with adegree of transverse coherence of about 80% and degeneracy parameter of the order 109 that makes itsimilar to laser sources. Intensity correlation measurements in spatial and frequency domain gave anestimate of the FEL average pulse duration of 50 fs. Our measurements of the higher-order correlationfunctions indicate that FEL radiation obeys Gaussian statistics, which is characteristic to chaotic sources.
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