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000485348 0247_ $$2arXiv$$aarXiv:2211.07426
000485348 0247_ $$2datacite_doi$$a10.3204/PUBDB-2022-06650
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000485348 088__ $$2arXiv$$aarXiv:2211.07426
000485348 1001_ $$0P:(DE-H253)PIP1001599$$aSchneidmiller, E. A.$$b0$$eCorresponding author
000485348 245__ $$aTwo-color operation of a soft x-ray FEL with alternation of undulator tunes
000485348 260__ $$c2022
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000485348 520__ $$aFLASH is the first soft X-ray FEL user facility, routinely providing brilliant photon beams for users since 2005. The second undulator branch of this facility, FLASH2, is gap-tunable which allows to test and use advanced lasing concepts. In particular, we developed a two-color operation mode based on the alternatingly tuned undulator segments (every other segment is tuned to the second wavelength). This scheme is advantageous in comparison with a subsequent generation of two colors in two consecutive sections of the undulator line. First, source positions of the two FEL beams are close to each other which makes it easier to focus them on a sample. Second, the amplification is more efficient in this configuration since the segments with respectively 'wrong' wavelength still act as bunchers. We studied operation of this scheme in the regime of small and large separation of tunes (up to a factor of two). We developed new methods for online intensity measurements of the two colors simultaneously that require a combination of two detectors. We also demonstrated our capabilities to measure spectral and temporal properties of two pulses with different wavelengths.
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000485348 7001_ $$0I.J.B.Macias.1$$aMacias, I. J. Bermudez$$b1
000485348 7001_ $$0P:(DE-H253)PIP1005334$$aBeye, M.$$b2
000485348 7001_ $$0P:(DE-H253)PIP1009448$$aBraune, M.$$b3
000485348 7001_ $$0P:(DE-H253)PIP1006256$$aCzwalinna, M.-K.$$b4
000485348 7001_ $$0P:(DE-H253)PIP1002687$$aDuesterer, S.$$b5
000485348 7001_ $$0P:(DE-H253)PIP1002602$$aFaatz, B.$$b6
000485348 7001_ $$0P:(DE-H253)PIP1019912$$aIvanov, R.$$b7
000485348 7001_ $$0P:(DE-H253)PIP1002367$$aJastrow, F.$$b8
000485348 7001_ $$0P:(DE-H253)PIP1003607$$aKuhlmann, M.$$b9
000485348 7001_ $$0P:(DE-H253)PIP1004087$$aRoensch-Schulenburg, J.$$b10
000485348 7001_ $$0P:(DE-H253)PIP1001613$$aSchreiber, S.$$b11
000485348 7001_ $$aSorokin, A.$$b12
000485348 7001_ $$0P:(DE-H253)PIP1001376$$aTiedtke, K.$$b13
000485348 7001_ $$0P:(DE-H253)PIP1001234$$aYurkov, M. V.$$b14
000485348 7001_ $$0P:(DE-H253)PIP1006317$$aZemella, J.$$b15
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