Unique capabilities and applications of Microchannel Plate (MCP) detectors with Medipix/Timepix readout

Tremsin, Anton S.; Vallerga, J. V.

doi:10.1016/j.radmeas.2019.106228

Cited by 65 publications

(43 citation statements)

References 95 publications

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“…For example, assuming the same efficiency of X-ray optics www.nature.com/scientificreports/ and RIXS spectrometer and similar SASE FEL spectral structure, the 30 kHz to 1 MHz repetition rate available at LCLS-II will allow a 300 to 10,000-fold improvement in data statistics, provided that a detector with a comparable readout rate is available. While the readout rate of the prototype detector used for our measurement is limited at 1 kHz, the technology adapted by the MCP/Timepix detector is capable of MHz readout rate 30 , which can be a candidate for time-resolved RIXS and other X-ray spectroscopy measurement using FEL with high repetition rates. Moreover, with high repetition rates, preliminary studies have indicated the possibility of obtaining SASE X-ray FEL with higher spectral brightness and less jitter in photon energy bandwidth, pulse energy, and timing 42 .…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, this method would not meet the demands of future X-ray FEL facilities, such as European XFEL and LCLS-II, which will operate at much higher FEL repetition rates (~ 30 kHz to 1 MHz). Recently, microchannel plate (MCP) detectors with Timepix readout 29,30 have become available for X-ray detection. These detectors are capable of fast readout operation (feasible at 1 MHz), allow single photon detection, possess high spatial resolution of ~ 5 to 10 μm limited by the pore size of the microchannel plates, and have high quantum efficiency for soft X-ray as required for RIXS study on quantum materials consist of 3d transition metal elements, such as cuprates and maganites.…”

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confidence: 99%

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Time-resolved RIXS experiment with pulse-by-pulse parallel readout data collection using X-ray free electron laser

Gauthier

Hepting

et al. 2020

Sci Rep

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Time-resolved resonant inelastic X-ray scattering (RIXS) is one of the developing techniques enabled by the advent of X-ray free electron laser (FEL). It is important to evaluate how the FEL jitter, which is inherent in the self-amplified spontaneous emission process, influences the RIXS measurement. Here, we use a microchannel plate (MCP) based Timepix soft X-ray detector to conduct a time-resolved RIXS measurement at the Ti L3-edge on a charge-density-wave material TiSe2. The fast parallel Timepix readout and single photon sensitivity enable pulse-by-pulse data acquisition and analysis. Due to the FEL jitter, low detection efficiency of spectrometer, and low quantum yield of RIXS process, we find that less than 2% of the X-ray FEL pulses produce signals, preventing acquiring sufficient data statistics while maintaining temporal and energy resolution in this measurement. These limitations can be mitigated by using future X-ray FELs with high repetition rates, approaching MHz such as the European XFEL in Germany and LCLS-II in the USA, as well as by utilizing advanced detectors, such as the prototype used in this study.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Time-resolved RIXS experiment with pulse-by-pulse parallel readout data collection using X-ray free electron laser

Gauthier

Hepting

et al. 2020

Sci Rep

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“…After these measurements, cracks were introduced into both samples by applying uniaxial compressive stresses. Finally, both samples ( was used for the energy-resolved neutron radiography measurements [12][13][14].…”

Section: Neutron Radiography and Water (Capillary) Absorption Experimmentioning

confidence: 99%

Microstructure and water absorption of ancient concrete from Pompeii: An integrated synchrotron microtomography and neutron radiography characterization

Tremsin

et al. 2021

Cement and Concrete Research

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There is renewed interest in using advanced techniques to characterize ancient Roman concrete. In the present work, samples were drilled from the "Hospitium" in Pompeii and were analyzed by synchrotron microtomography (μCT) and neutron radiography to study how the microstructure, including the presence of induced cracks, affects their water adsorption. The water distribution and absorptivity were quantified by neutron radiography. The 3D crack propagation, pore size distribution and orientation, tortuosity, and connectivity were analyzed from μCT results using advanced imaging methods. The concrete characterization also included classical methods (e.g., differential thermal-thermogravimetric, X-ray diffractometry, and scanning electron microscopy). Ductile fracture patterns were observed once cracks were introduced. When compared to Portland cement mortar/concrete, Pompeii samples had relatively high porosity, low connectivity, and similar coefficient of capillary penetration. In addition, the permeability was predicted from models based on percolation theory and the pore structure data to evaluate the fluid transport properties.

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“…RADEN has instrumentation that allows for time-of-flight neutron imaging experiments, with neutron wavelengths that reach up to 8.8 Å with a resolution of approximately ∆λ /λ = 0.2% above 3 Å. The detector used was a pixelated micro-channel plate (MCP)/Timepix detector and its latest developments are reported Tremsin et al 30 . This detector has a pixel size of 55 µm, and 512 × 512 pixels.…”

Section: Experimental Setup Instrumentationmentioning

confidence: 99%

A Parametric Neutron Bragg Edge Imaging Study of Additively Manufactured Samples Treated by Laser Shock Peening

Busi

Kalentics

Morgano

et al. 2021

Preprint

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Laser powder bed fusion is an additive manufacturing technique extensively used for the production of metallic components. Despite this process has reached a status at which parts are produced with mechanical properties comparable to those from conventional production, it is still prone to introduce detrimental tensile residual stresses towards the surfaces along the building direction, implying negative consequences on fatigue life and resistance to crack formations. Laser shock peening (LSP) is a promising method adopted to compensate tensile residual stresses and to introduce beneficial compressive residual stress on the treated surfaces. Using neutron Bragg edge imaging, we perform a parametric study of LSP applied to 316L steel samples produced by laser powder bed fusion additive manufacturing. We include in the study the novel 3D-LSP technique, where samples are LSP treated also during the building process, at intermediate build layers. The LSP energy and spot overlap were set to either 1.0 or 1.5 J and 40% or 80% respectively. The results support the use of 3D-LSP treatment with the higher LSP laser energy and overlap applied, which showed a relative increase of surface compressive residual stress (CRS) and CRS depth by 57% and 104% respectively, compared to the conventional LSP treatment.

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Unique capabilities and applications of Microchannel Plate (MCP) detectors with Medipix/Timepix readout

Cited by 65 publications

References 95 publications

Time-resolved RIXS experiment with pulse-by-pulse parallel readout data collection using X-ray free electron laser

Time-resolved RIXS experiment with pulse-by-pulse parallel readout data collection using X-ray free electron laser

Microstructure and water absorption of ancient concrete from Pompeii: An integrated synchrotron microtomography and neutron radiography characterization

A Parametric Neutron Bragg Edge Imaging Study of Additively Manufactured Samples Treated by Laser Shock Peening

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