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High-resolution soft X-ray beamline ADRESS at the Swiss Light Source for resonant inelastic X-ray scattering and angle-resolved photoelectron spectroscopies.

Strocov VN, Schmitt T, Flechsig U, Schmidt T, Imhof A, Chen Q, Raabe J, Betemps R, Zimoch D, Krempasky J, Wang X, Grioni M, Piazzalunga A, Patthey L - J Synchrotron Radiat (2010)

Bottom Line: Owing to glancing angles on the mirrors as well as optimized groove densities and profiles of the gratings, the beamline is capable of delivering high photon flux up to 1 x 10(13) photons s(-1) (0.01% BW)(-1) at 1 keV.Apart from the beamline optics, an overview of the control system is given, the diagnostics and software tools are described, and strategies used for the optical alignment are discussed.An introduction to the concepts and instrumental realisation of the ARPES and RIXS endstations is given.

View Article: PubMed Central - HTML - PubMed

Affiliation: Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland. vladimir.strocov@psi.ch

ABSTRACT
The concepts and technical realisation of the high-resolution soft X-ray beamline ADRESS operating in the energy range from 300 to 1600 eV and intended for resonant inelastic X-ray scattering (RIXS) and angle-resolved photoelectron spectroscopy (ARPES) are described. The photon source is an undulator of novel fixed-gap design where longitudinal movement of permanent magnetic arrays controls not only the light polarization (including circular and 0-180 degrees rotatable linear polarizations) but also the energy without changing the gap. The beamline optics is based on the well established scheme of plane-grating monochromator operating in collimated light. The ultimate resolving power E/DeltaE is above 33000 at 1 keV photon energy. The choice of blazed versus lamellar gratings and optimization of their profile parameters is described. Owing to glancing angles on the mirrors as well as optimized groove densities and profiles of the gratings, the beamline is capable of delivering high photon flux up to 1 x 10(13) photons s(-1) (0.01% BW)(-1) at 1 keV. Ellipsoidal refocusing optics used for the RIXS endstation demagnifies the vertical spot size down to 4 microm, which allows slitless operation and thus maximal transmission of the high-resolution RIXS spectrometer delivering E/DeltaE > 11000 at 1 keV photon energy. Apart from the beamline optics, an overview of the control system is given, the diagnostics and software tools are described, and strategies used for the optical alignment are discussed. An introduction to the concepts and instrumental realisation of the ARPES and RIXS endstations is given.

No MeSH data available.


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Theoretical flux at the sample as a function of photon energy for the LH polarized light and 400 mA current in the ring. The three bunches of solid lines correspond to the three gratings (indicated on the right) and the bunch shown shaded to the blazed 800 lines/mm grating operating in the second order. Variations of flux from the bottom to top edges of each bunch correspond to variation of C                  ff in integer values within the limits indicated on the left. The flux is normalized to the bandwidth corresponding to the E/ΔE values typical of each grating (indicated on the right).
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fig7: Theoretical flux at the sample as a function of photon energy for the LH polarized light and 400 mA current in the ring. The three bunches of solid lines correspond to the three gratings (indicated on the right) and the bunch shown shaded to the blazed 800 lines/mm grating operating in the second order. Variations of flux from the bottom to top edges of each bunch correspond to variation of C ff in integer values within the limits indicated on the left. The flux is normalized to the bandwidth corresponding to the E/ΔE values typical of each grating (indicated on the right).

Mentions: Fig. 7 ▶ shows the theoretical flux that the beamline delivers at the sample (after the RM) as a function of photon energy for a current in the ring of 400 mA and LH polarized light, with a crossover between the first and third harmonic radiation at around 865 eV (Fig. 1 ▶). Similarly to the resolution data in Fig. 3 ▶, the three bunches of solid lines correspond to the three gratings. Variation of flux from the bottom to top edges of each bunch corresponds to variation of C ff in integer values, the same as in Fig. 3 ▶ (from the floor function of the flux-optimal C ff in the 700–1200 eV region to the maximal integer C ff for which the light footprint stays within the optical surface of the gratings). The flux is normalized to the energy-dependent bandwidth corresponding to the E/ΔE values typical of each grating. At 1 keV photon energy and flux-optimal C ff value, the theoretical flux for the 800 lines/mm grating is 1.3 × 1013 photons s−1 in a bandwidth corresponding to E/ΔE = 10000, for the 2000 lines/mm grating it is 1.7 × 1012 photons s−1 corresponding to E/ΔE = 15000, and for the 4200 lines/mm grating it is 2.4 × 1011 photons s−1 corresponding to E/ΔE = 20000.


High-resolution soft X-ray beamline ADRESS at the Swiss Light Source for resonant inelastic X-ray scattering and angle-resolved photoelectron spectroscopies.

Strocov VN, Schmitt T, Flechsig U, Schmidt T, Imhof A, Chen Q, Raabe J, Betemps R, Zimoch D, Krempasky J, Wang X, Grioni M, Piazzalunga A, Patthey L - J Synchrotron Radiat (2010)

Theoretical flux at the sample as a function of photon energy for the LH polarized light and 400 mA current in the ring. The three bunches of solid lines correspond to the three gratings (indicated on the right) and the bunch shown shaded to the blazed 800 lines/mm grating operating in the second order. Variations of flux from the bottom to top edges of each bunch correspond to variation of C                  ff in integer values within the limits indicated on the left. The flux is normalized to the bandwidth corresponding to the E/ΔE values typical of each grating (indicated on the right).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2927903&req=5

fig7: Theoretical flux at the sample as a function of photon energy for the LH polarized light and 400 mA current in the ring. The three bunches of solid lines correspond to the three gratings (indicated on the right) and the bunch shown shaded to the blazed 800 lines/mm grating operating in the second order. Variations of flux from the bottom to top edges of each bunch correspond to variation of C ff in integer values within the limits indicated on the left. The flux is normalized to the bandwidth corresponding to the E/ΔE values typical of each grating (indicated on the right).
Mentions: Fig. 7 ▶ shows the theoretical flux that the beamline delivers at the sample (after the RM) as a function of photon energy for a current in the ring of 400 mA and LH polarized light, with a crossover between the first and third harmonic radiation at around 865 eV (Fig. 1 ▶). Similarly to the resolution data in Fig. 3 ▶, the three bunches of solid lines correspond to the three gratings. Variation of flux from the bottom to top edges of each bunch corresponds to variation of C ff in integer values, the same as in Fig. 3 ▶ (from the floor function of the flux-optimal C ff in the 700–1200 eV region to the maximal integer C ff for which the light footprint stays within the optical surface of the gratings). The flux is normalized to the energy-dependent bandwidth corresponding to the E/ΔE values typical of each grating. At 1 keV photon energy and flux-optimal C ff value, the theoretical flux for the 800 lines/mm grating is 1.3 × 1013 photons s−1 in a bandwidth corresponding to E/ΔE = 10000, for the 2000 lines/mm grating it is 1.7 × 1012 photons s−1 corresponding to E/ΔE = 15000, and for the 4200 lines/mm grating it is 2.4 × 1011 photons s−1 corresponding to E/ΔE = 20000.

Bottom Line: Owing to glancing angles on the mirrors as well as optimized groove densities and profiles of the gratings, the beamline is capable of delivering high photon flux up to 1 x 10(13) photons s(-1) (0.01% BW)(-1) at 1 keV.Apart from the beamline optics, an overview of the control system is given, the diagnostics and software tools are described, and strategies used for the optical alignment are discussed.An introduction to the concepts and instrumental realisation of the ARPES and RIXS endstations is given.

View Article: PubMed Central - HTML - PubMed

Affiliation: Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland. vladimir.strocov@psi.ch

ABSTRACT
The concepts and technical realisation of the high-resolution soft X-ray beamline ADRESS operating in the energy range from 300 to 1600 eV and intended for resonant inelastic X-ray scattering (RIXS) and angle-resolved photoelectron spectroscopy (ARPES) are described. The photon source is an undulator of novel fixed-gap design where longitudinal movement of permanent magnetic arrays controls not only the light polarization (including circular and 0-180 degrees rotatable linear polarizations) but also the energy without changing the gap. The beamline optics is based on the well established scheme of plane-grating monochromator operating in collimated light. The ultimate resolving power E/DeltaE is above 33000 at 1 keV photon energy. The choice of blazed versus lamellar gratings and optimization of their profile parameters is described. Owing to glancing angles on the mirrors as well as optimized groove densities and profiles of the gratings, the beamline is capable of delivering high photon flux up to 1 x 10(13) photons s(-1) (0.01% BW)(-1) at 1 keV. Ellipsoidal refocusing optics used for the RIXS endstation demagnifies the vertical spot size down to 4 microm, which allows slitless operation and thus maximal transmission of the high-resolution RIXS spectrometer delivering E/DeltaE > 11000 at 1 keV photon energy. Apart from the beamline optics, an overview of the control system is given, the diagnostics and software tools are described, and strategies used for the optical alignment are discussed. An introduction to the concepts and instrumental realisation of the ARPES and RIXS endstations is given.

No MeSH data available.


Related in: MedlinePlus