The new FL23 pulse-length preserving double-grating monochromator beamline is an open-port variable micro-focus beamline covering the FEL wavelength range of 1.2 – 20 nm (including FEL harmonics). The double grating monochromator design of FL23 will provide a narrow spectral bandwidth of the FLASH2 photon pulses while preserving the ultrashort (FEL) pulse duration of less than 50 fs. A Kirkpatrick-Baez mirror system employing bendable mirrors focuses the monochromatized radiation down to approx. 5 x 5 um beam size at the target, independent of the monochromator slit. Due to a moveable exit arm, the monochromator can be used in double- or single-grating configuration. The latter allows higher throughput and is particularly interesting when using harmonics at short wavelengths.
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Photon Beam Parameter (Baseline Configuration) |
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Photon energy |
3.5 – 20 nm (down to 1.2 nm including harmonics) |
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Flux@sample |
1010 photons |
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Focus size |
5 um x 5 um FWHM (variable) |
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Pulse duration |
<100 fs FWHM |
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Resolving power |
Resolving power > 2000 |
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Configurations |
Single (high transmission) & double grating (pulse length preserving) |
CONTACT:
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