Holldack, Karsten, Bahrdt, Johannes, Balzer, Andreas, Bovensiepen, Uwe ORCID: 0000-0002-1506-4491, Brzhezinskaya, Maria, Erko, Alexei, Eschenlohr, Andrea, Follath, Rolf, Firsov, Alexander, Frentrup, Winfried, Le Guyader, Loic ORCID: 0000-0002-5731-3724, Kachel, Torsten, Kuske, Peter, Mitzner, Rolf, Mueller, Roland, Pontius, Niko, Quast, Torsten, Radu, Ilie, Schmidt, Jan-Simon, Schuessler-Langeheine, Christian, Sperling, Mike, Stamm, Christian ORCID: 0000-0001-5611-9084, Trabant, Christoph and Foehlisch, Alexander (2014). FemtoSpeX: a versatile optical pump-soft X-ray probe facility with 100 fs X-ray pulses of variable polarization. J. Synchrot. Radiat., 21. S. 1090 - 1105. CHESTER: INT UNION CRYSTALLOGRAPHY. ISSN 1600-5775

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Abstract

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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Holldack, KarstenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bahrdt, JohannesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Balzer, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bovensiepen, UweUNSPECIFIEDorcid.org/0000-0002-1506-4491UNSPECIFIED
Brzhezinskaya, MariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erko, AlexeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eschenlohr, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Follath, RolfUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Firsov, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Frentrup, WinfriedUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Le Guyader, LoicUNSPECIFIEDorcid.org/0000-0002-5731-3724UNSPECIFIED
Kachel, TorstenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuske, PeterUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mitzner, RolfUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, RolandUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pontius, NikoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Quast, TorstenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Radu, IlieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmidt, Jan-SimonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schuessler-Langeheine, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sperling, MikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stamm, ChristianUNSPECIFIEDorcid.org/0000-0001-5611-9084UNSPECIFIED
Trabant, ChristophUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Foehlisch, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-430184
DOI: 10.1107/S1600577514012247
Journal or Publication Title: J. Synchrot. Radiat.
Volume: 21
Page Range: S. 1090 - 1105
Date: 2014
Publisher: INT UNION CRYSTALLOGRAPHY
Place of Publication: CHESTER
ISSN: 1600-5775
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ANGULAR-MOMENTUM TRANSFER; ZONE-PLATE; SPIN; UNDULATOR; DYNAMICS; GENERATION; RADIATION; REVERSALMultiple languages
Instruments & Instrumentation; Optics; Physics, AppliedMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/43018

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