Magnetic scattering experiments with an ultrashort pulsed soft X-ray source using iLGADs
Abstract
Inverse Low Gain Avalanche Diode (iLGAD) sensors developed at the Paul Scherrer Institute (PSI) in collaboration with the Fondazione Bruno Kessler (FBK) have demonstrated an excellent Signal-to-Noise Ratio (SNR) and Quantum Efficiency (QE) in the soft X-ray range. In the current batch, single-photon detection is achievable at 400 eV with an SNR > 5, while the QE surpasses 85 % at 250 eV. Combined with the high frame rates of CMOS readout ASIC, iLGAD sensors make the hybrid pixel detectors excellent candidates for time-resolved magnetic Small Angle X-ray Scattering (mSAXS) experiments in the soft X-ray energy range. In this contribution, we evaluated ILGAD sensors bump-bonded to 25 μm pitch charge-integrating MÖNCH chips at a laser-driven soft X-ray source. During the experiments, we measured energy-dispersed radiation between 600 eV and 1500 eV. These measurements were performed for the iLGAD sensor, as well as for the standard silicon sensor. Using the high-precision electronic trigger of the X-ray source, we were able to synchronise the detector with the X-ray source delivering few-picosecond pulses and optimise the timing parameters for the acquisition. Finally, we successfully performed the mSAXS experiment probing the magnetic domain pattern of a FeGd heterostructure, demonstrating better performance than a MÖNCH detector with a standard silicon sensor. ILGAD sensors achieved a significantly higher photon detection efficiency and, consequently, a higher sensitivity compared to standard silicon sensors under the same conditions, particularly for the lower-energy Fe L3 edge.
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BibTeX
@misc{lunin2026magnetic,
title = {{Magnetic scattering experiments with an ultrashort pulsed soft X-ray source using iLGADs}},
author = {L. Lunin and S. Li and A. Bergamaschi and P. Wernicke and D. Schick and M. Mattern and B. Pfau and A. Bisht and M. Boscardin and M. Brückner and M. Carulla and M. Centis Vignali and R. Dinapoli and S. Ebner and S. Emiliani and K. Ferjaoui and F. Ficorella and E. Fröjdh and V. Gautam and D. Greiffenberg and O. Hammad Ali and S. Hasanaj and V. Hinger and M. Hürst and V. Kedych and T. King and C. Lopez-Cuenca and A. Mazzoleni and D. Mezza and K. Moustakas and A. Mozzanica and J. Mulvey and M. Müller and G. Paternoster and S. Ronchin and C. Ruder and B. Schmitt and S. Silletta and D. Thattil and X. Xie and J. Zhang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41611},
eprint = {2610.41611},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41611},
note = {CC BY-SA 4.0},
}
RIS
TY - UNPB
TI - Magnetic scattering experiments with an ultrashort pulsed soft X-ray source using iLGADs
AU - L. Lunin
AU - S. Li
AU - A. Bergamaschi
AU - P. Wernicke
AU - D. Schick
AU - M. Mattern
AU - B. Pfau
AU - A. Bisht
AU - M. Boscardin
AU - M. Brückner
AU - M. Carulla
AU - M. Centis Vignali
AU - R. Dinapoli
AU - S. Ebner
AU - S. Emiliani
AU - K. Ferjaoui
AU - F. Ficorella
AU - E. Fröjdh
AU - V. Gautam
AU - D. Greiffenberg
AU - O. Hammad Ali
AU - S. Hasanaj
AU - V. Hinger
AU - M. Hürst
AU - V. Kedych
AU - T. King
AU - C. Lopez-Cuenca
AU - A. Mazzoleni
AU - D. Mezza
AU - K. Moustakas
AU - A. Mozzanica
AU - J. Mulvey
AU - M. Müller
AU - G. Paternoster
AU - S. Ronchin
AU - C. Ruder
AU - B. Schmitt
AU - S. Silletta
AU - D. Thattil
AU - X. Xie
AU - J. Zhang
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41611
UR - https://arxiv.org/abs/2610.41611
AB - Inverse Low Gain Avalanche Diode (iLGAD) sensors developed at the Paul Scherrer Institute (PSI) in collaboration with the Fondazione Bruno Kessler (FBK) have demonstrated an excellent Signal-to-Noise Ratio (SNR) and Quantum Efficiency (QE) in the soft X-ray range. In the current batch, single-photon detection is achievable at 400 eV with an SNR > 5, while the QE surpasses 85 % at 250 eV. Combined with the high frame rates of CMOS readout ASIC, iLGAD sensors make the hybrid pixel detectors excellent candidates for time-resolved magnetic Small Angle X-ray Scattering (mSAXS) experiments in the soft X-ray energy range. In this contribution, we evaluated ILGAD sensors bump-bonded to 25 μm pitch charge-integrating MÖNCH chips at a laser-driven soft X-ray source. During the experiments, we measured energy-dispersed radiation between 600 eV and 1500 eV. These measurements were performed for the iLGAD sensor, as well as for the standard silicon sensor. Using the high-precision electronic trigger of the X-ray source, we were able to synchronise the detector with the X-ray source delivering few-picosecond pulses and optimise the timing parameters for the acquisition. Finally, we successfully performed the mSAXS experiment probing the magnetic domain pattern of a FeGd heterostructure, demonstrating better performance than a MÖNCH detector with a standard silicon sensor. ILGAD sensors achieved a significantly higher photon detection efficiency and, consequently, a higher sensitivity compared to standard silicon sensors under the same conditions, particularly for the lower-energy Fe L3 edge.
ER -