FemtoSpeX a versatile optical pump-soft X-ray probe facility with 100 fs X-ray pulses of variable polarization

FemtoSpeX : a versatile optical pump-soft X-ray probe facility with 100 fs X-ray pulses of variable polarization

Here the major upgrades of the femtoslicing facility at BESSY II (Khan et al., 2006) are reviewed, giving a tutorial on how elliptical-polarized ultrashort soft X-ray pulses from electron storage rings are generated at high repetition rates. Employing a 6 kHz femtosecond-laser system consisting of t...

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Veröffentlicht in:Journal of synchrotron radiation. - 1994. - 21(2014), Pt 5 vom: 22. Sept., Seite 1090-104
1. Verfasser: Holldack, Karsten (VerfasserIn)
Weitere Verfasser: Bahrdt, Johannes, Balzer, Andreas, Bovensiepen, Uwe, Brzhezinskaya, Maria, Erko, Alexei, Eschenlohr, Andrea, Follath, Rolf, Firsov, Alexander, Frentrup, Winfried, Le Guyader, Loïc, Kachel, Torsten, Kuske, Peter, Mitzner, Rolf, Müller, Roland, Pontius, Niko, Quast, Torsten, Radu, Ilie, Schmidt, Jan Simon, Schüssler-Langeheine, Christian, Sperling, Mike, Stamm, Christian, Trabant, Christoph, Föhlisch, Alexander
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2014
Zugriff auf das übergeordnete Werk:Journal of synchrotron radiation
Schlagworte:Journal Article Research Support, Non-U.S. Gov't diffractive optics elliptical undulators femtosecond X-ray pulses slicing storage ring time-resolved X-ray spectroscopy ultrafast science
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520 |a Here the major upgrades of the femtoslicing facility at BESSY II (Khan et al., 2006) are reviewed, giving a tutorial on how elliptical-polarized ultrashort soft X-ray pulses from electron storage rings are generated at high repetition rates. Employing a 6 kHz femtosecond-laser system consisting of two amplifiers that are seeded by one Ti:Sa oscillator, the total average flux of photons of 100 fs duration (FWHM) has been increased by a factor of 120 to up to 10(6) photons s(-1) (0.1% bandwidth)(-1) on the sample in the range from 250 to 1400 eV. Thanks to a new beamline design, a factor of 20 enhanced flux and improvements of the stability together with the top-up mode of the accelerator have been achieved. The previously unavoidable problem of increased picosecond-background at higher repetition rates, caused by `halo' photons, has also been solved by hopping between different `camshaft' bunches in a dedicated fill pattern (`3+1 camshaft fill') of the storage ring. In addition to an increased X-ray performance at variable (linear and elliptical) polarization, the sample excitation in pump-probe experiments has been considerably extended using an optical parametric amplifier that supports the range from the near-UV to the far-IR regime. Dedicated endstations covering ultrafast magnetism experiments based on time-resolved X-ray circular dichroism have been either upgraded or, in the case of time-resolved resonant soft X-ray diffraction and reflection, newly constructed and adapted to femtoslicing requirements. Experiments at low temperatures down to 6 K and magnetic fields up to 0.5 T are supported. The FemtoSpeX facility is now operated as a 24 h user facility enabling a new class of experiments in ultrafast magnetism and in the field of transient phenomena and phase transitions in solids 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a diffractive optics 
650 4 |a elliptical undulators 
650 4 |a femtosecond X-ray pulses 
650 4 |a slicing 
650 4 |a storage ring 
650 4 |a time-resolved X-ray spectroscopy 
650 4 |a ultrafast science 
700 1 |a Bahrdt, Johannes  |e verfasserin  |4 aut 
700 1 |a Balzer, Andreas  |e verfasserin  |4 aut 
700 1 |a Bovensiepen, Uwe  |e verfasserin  |4 aut 
700 1 |a Brzhezinskaya, Maria  |e verfasserin  |4 aut 
700 1 |a Erko, Alexei  |e verfasserin  |4 aut 
700 1 |a Eschenlohr, Andrea  |e verfasserin  |4 aut 
700 1 |a Follath, Rolf  |e verfasserin  |4 aut 
700 1 |a Firsov, Alexander  |e verfasserin  |4 aut 
700 1 |a Frentrup, Winfried  |e verfasserin  |4 aut 
700 1 |a Le Guyader, Loïc  |e verfasserin  |4 aut 
700 1 |a Kachel, Torsten  |e verfasserin  |4 aut 
700 1 |a Kuske, Peter  |e verfasserin  |4 aut 
700 1 |a Mitzner, Rolf  |e verfasserin  |4 aut 
700 1 |a Müller, Roland  |e verfasserin  |4 aut 
700 1 |a Pontius, Niko  |e verfasserin  |4 aut 
700 1 |a Quast, Torsten  |e verfasserin  |4 aut 
700 1 |a Radu, Ilie  |e verfasserin  |4 aut 
700 1 |a Schmidt, Jan Simon  |e verfasserin  |4 aut 
700 1 |a Schüssler-Langeheine, Christian  |e verfasserin  |4 aut 
700 1 |a Sperling, Mike  |e verfasserin  |4 aut 
700 1 |a Stamm, Christian  |e verfasserin  |4 aut 
700 1 |a Trabant, Christoph  |e verfasserin  |4 aut 
700 1 |a Föhlisch, Alexander  |e verfasserin  |4 aut 
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