A compact fibre-coupled active beamstop for fast time-resolved monitoring of synchrotron X-ray beams
Abstract
We have developed a compact fibre-coupled active beamstop for simultaneous interception and time-resolved monitoring of the direct X-ray beam in synchrotron diffraction experiments. The complete beamstop tip has a maximum transverse dimension of 1 mm and incorporates a 700 μm-wide Ce:YAG scintillator. The scintillator converts the intercepted X-rays into visible light, which is transported through a multimode optical fibre to a silicon photodiode at the bottom of the blade that is connected to a dedicated fast amplifier electronics. Tests with a pulsed laser yielded a system decay time of 69.4 ns, consistent with reported luminescence decay times for Ce:YAG. Measurements at the P14.EH2 end station of PETRA III demonstrated the detection of individual bunch signals separated by 192 ns in the 40-bunch operating mode. The active beamstop also provided an in-situ timing signal for synchronising an experimental sequence with the approximately 190 μs transmission window of a mechanical X-ray chopper. The device therefore combines a compact obstruction of the direct beam with fast monitoring of X-ray timing and flux during diffraction data acquisition.
Related
- High-resolution in situ analysis of biomass pyrolysis by combining quantitative synchrotron μCT and 3D particle-resolved simulations
- Beamstop-free small-angle X-ray scattering for multiscale structure measurement of high-energy-density plasma
- Momentum-resolved thermodynamics and barrier-free order-parameter collapse in spin-orbit-coupled superconductors under a Zeeman field
- Lattice spin systems coupled to a compact U(1) gauge field with negative gauge coupling favoring frustration
- Unconstrained compact lattice QED2+1 coupled to phonons: Gauss sectors, orthogonal semimetal, and deconfined criticality
BibTeX
@misc{tellkamp2026compact,
title = {{A compact fibre-coupled active beamstop for fast time-resolved monitoring of synchrotron X-ray beams}},
author = {Friedjof Tellkamp and David von Stetten and Martin Kollewe},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21618},
eprint = {2609.21618},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.21618},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - A compact fibre-coupled active beamstop for fast time-resolved monitoring of synchrotron X-ray beams
AU - Friedjof Tellkamp
AU - David von Stetten
AU - Martin Kollewe
PY - 2026
DA - 2026/09/18
PB - arXiv
DO - 10.48550/arxiv.2609.21618
UR - https://arxiv.org/abs/2609.21618
AB - We have developed a compact fibre-coupled active beamstop for simultaneous interception and time-resolved monitoring of the direct X-ray beam in synchrotron diffraction experiments. The complete beamstop tip has a maximum transverse dimension of 1 mm and incorporates a 700 μm-wide Ce:YAG scintillator. The scintillator converts the intercepted X-rays into visible light, which is transported through a multimode optical fibre to a silicon photodiode at the bottom of the blade that is connected to a dedicated fast amplifier electronics. Tests with a pulsed laser yielded a system decay time of 69.4 ns, consistent with reported luminescence decay times for Ce:YAG. Measurements at the P14.EH2 end station of PETRA III demonstrated the detection of individual bunch signals separated by 192 ns in the 40-bunch operating mode. The active beamstop also provided an in-situ timing signal for synchronising an experimental sequence with the approximately 190 μs transmission window of a mechanical X-ray chopper. The device therefore combines a compact obstruction of the direct beam with fast monitoring of X-ray timing and flux during diffraction data acquisition.
ER -