The MÖNCH Detector for Soft X-ray, High-Resolution, and Energy Resolved Applications

Bergamaschi, A.; Andrä, M.; Barten, R.; Borca, Camelia N.; Brückner, Martin; Chiriotti, S.; Dinapoli, R.; Fröjdh, E.; Greiffenberg, D.; Huthwelker, Thomas; Kleibert, Armin; Langer, Manuel; Lebugle, Maxime; Lopez-Cuenca, C.; Mezza, D.; Mozzanica, A.; Raabe, Jörg; Redford, S.; Ruder, C.; Scagnoli, V.; Schmitt, B.; Shi, X.; Staub, U.; Thattil, D.; Tinti, G.; Vaz, Carlos F. A.; Vetter, S.; Vila‐Comamala, Joan; Zhang, Jiaguo

doi:10.1080/08940886.2018.1528428

Cited by 16 publications

(11 citation statements)

References 20 publications

(19 reference statements)

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“…From our simulations, we predict an increase of the maximum degree of circular polarization at the Fe L 3 edge for a 200 nm (400 nm) thick polarizer of 85% (99%) at a total transmission of 1.0% (0.04%) for the current 50 nm sample. Although the detectable photon flux is drastically reduced by one to two orders of magnitude for such polarizer thicknesses, it will at the same time allow for single photon counting schemes, using novel area detector generations [35,36], for which the noise of the experiment is finally approaching the shot noise limit. Moreover, the 100 Hz repetition rate of the experiment is currently determined by the laser system, while the mechanical source and detection would easily allow for repetition rates of >1000 Hz.…”

Section: Resultsmentioning

confidence: 99%

Picosecond x-ray magnetic circular dichroism spectroscopy at the Fe L-edges with a laser-driven plasma source

Borchert¹,

Engel²,

Schmising³

et al. 2022

Preprint

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Time-resolved x-ray magnetic circular dichroism (XMCD) enables a unique spectroscopic view on complex spin and charge dynamics in multi-elemental magnetic materials. So far, its application in the soft-x-ray range has been limited to synchrotron-radiation sources and free-electron lasers. By combining a laser-driven plasma source with a magnetic thin-film polarizer, we generate circularly polarized photons in the soft x-ray regime, enabling the first XMCD spectroscopy at the Fe L edges in a laser laboratory. Our approach can be readily adapted to other transition metal L and rare earth M absorption edges and with a temporal resolution of < 10 ps, a wide range of ultrafast magnetization studies can be realized.

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Section: Resultsmentioning

confidence: 99%

Picosecond x-ray magnetic circular dichroism spectroscopy at the Fe L-edges with a laser-driven plasma source

Borchert¹,

Engel²,

Schmising³

et al. 2022

Preprint

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“…The filtered beam illuminated the zone plate placed 117 mm downstream of the source, and the first diffraction order was isolated using a 10 mm pinhole placed in the focal plane 48 mm downstream of the zone plate. The emerging light was projected onto a MÖ NCH03 direct-conversion hybrid Si pixel detector (Ramilli et al, 2017;Bergamaschi et al, 2018) placed 1135 mm downstream from the pinhole and yielding a projection of the efficiency distribution of the zone plate. In the diffraction efficiency measurements, a Hamamatsu Photon Counting Head H10682-210 (PCH) was placed behind the pinhole and counted the transmitted flux.…”

Section: X-ray Tube Setup Designmentioning

confidence: 99%

Measurement and compensation of misalignment in double-sided hard X-ray Fresnel zone plates

Yurgens

Koch

Scheel

et al. 2020

J Synchrotron Radiat

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Double-sided Fresnel zone plates are diffractive lenses used for high-resolution hard X-ray microscopy. The double-sided structures have significantly higher aspect ratios compared with single-sided components and hence enable more efficient imaging. The zone plates discussed in this paper are fabricated on each side of a thin support membrane, and the alignment of the zone plates with respect to each other is critical. Here, a simple and reliable way of quantifying misalignments by recording efficiency maps and measuring the absolute diffraction efficiency of the zone plates as a function of tilting angle in two directions is presented. The measurements are performed in a setup based on a tungsten-anode microfocus X-ray tube, providing an X-ray energy of 8.4 keV through differential measurements with a Cu and an Ni filter. This study investigates the sources of the misalignments and concludes that they can be avoided by decreasing the structure heights on both sides of the membrane and by pre-programming size differences between the front- and back-side zone plates.

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“…This situation is supposed to improve in the near future as the soft-x-ray detector technology is about to be significantly advanced [26][27][28] and forth-generation synchrotron-radiation sources are coming in operation, providing almost fully coherent soft x rays of much higher intensity. However, the progression towards much shorter timescales will still be hampered by the low magnetic scattering cross-section.…”

Section: Introductionmentioning

confidence: 99%

Photon correlation spectroscopy with heterodyne mixing based on soft-x-ray magnetic circular dichroism

Klose,

Büttner,

et al. 2021

Preprint

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The MÖNCH Detector for Soft X-ray, High-Resolution, and Energy Resolved Applications

Cited by 16 publications

References 20 publications

Picosecond x-ray magnetic circular dichroism spectroscopy at the Fe L-edges with a laser-driven plasma source

Picosecond x-ray magnetic circular dichroism spectroscopy at the Fe L-edges with a laser-driven plasma source

Measurement and compensation of misalignment in double-sided hard X-ray Fresnel zone plates

Photon correlation spectroscopy with heterodyne mixing based on soft-x-ray magnetic circular dichroism

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