The Experts below are selected from a list of 26103 Experts worldwide ranked by ideXlab platform
Hendrik Jansen - One of the best experts on this subject based on the ideXlab platform.
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Simulation of Material Budget measurements with beam telescopes
Proceedings of The 26th International Workshop on Vertex Detectors — PoS(Vertex 2017), 2018Co-Authors: Hendrik Jansen, Paul SchuetzeAbstract:High-precision particle tracking devices allow for a two-dimensional analysis of the Material Budget distribution of, e.g., particle detectors and their periphery. These tracking devices, called beam telescopes, enable a precise measurement of the trajectory of charged particles with a position resolution of a few micrometer and an angular resolution of the order of a few ten microradian. In this contribution, the Material Budget of a structured aluminium cube is reconstructed from various estimators based on the deflection angles of simulated electron trajectories. Probing a target under various rotation angles enables a tomographic reconstruction of the target. We discuss the performance of width estimators of the scattering angle distributions and their impact on the contrast and the resolution of the reconstructed two- and three-dimensional images. At a voxel size of 0.1 mm $\times$ 0.1 mm $\times$ 0.1 mm, we reconstruct the Material Budget with a contrast to noise ratio of $5.6\pm0.2$ and an edge resolution of about $(70\pm10)$ micrometre.
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Feasibility Study of a Track-Based Multiple Scattering Tomography
Springer Proceedings in Physics, 2018Co-Authors: Paul Schütze, Hendrik JansenAbstract:We propose a new tomographic imaging method based on the multiple Coulomb scattering processes of electrons in the GeV-range. Particle tracking devices are used for a position-resolved measurement of the distribution of scattering angles at a sample. From this, an estimate of the two-dimensional Material Budget distribution of the sample is extracted. Repeating this measurement for different particle incidence angles enables a reconstruction of the three-dimensional Material Budget distribution.
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Scattering Studies with the DATURA Beam Telescope
Springer Proceedings in Physics, 2018Co-Authors: Hendrik Jansen, Paul Schütze, Jan Dreyling-eschweiler, Simon SpannagelAbstract:High-precision particle tracking devices allow for two-dimensional analyses of the Material Budget distribution of particle detectors and their periphery. In this contribution, the Material Budget of different targets is reconstructed from the width of the angular distribution of scattered beam particle at a sample under test. Positrons in the GeV-range serve as beam particles carrying enough momentum to traverse few millimetre thick targets whilst offering sufficient deflection for precise measurement. Reference measurements of the scattering angle distribution of targets of known thicknesses are presented that serve as calibration techniques required for tomographic reconstructions of inhomogeneous objects.
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Feasibility of track-based multiple scattering tomography
Applied Physics Letters, 2018Co-Authors: Hendrik Jansen, Paul SchuetzeAbstract:We present a tomographic technique making use of a gigaelectronvolt electron beam for the measurement of the spatial Material Budget distribution of centimetre-sized objects. With simulation tools originating from high-energy physics applications, a test environment replicating a beam telescope is set up to measure the trajectory of electrons traversing a structured aluminium cube with 6 mm edge length. The variance of the deflection angle distribution of the electrons undergoing multiple Coulomb scattering at the aluminium cube serves as an estimator for the radon transform of the Material Budget distribution. Basing the sinogram on position-resolved estimators enables the reconstruction of the original object. We show the feasibility of the reconstruction of the three-dimensional Material Budget distribution of the aluminium cube by successively imaging two-dimensional distributions of the projected Material Budget under varying rotation angles. Using a filtered back projection, the reconstructed image yields edge resolutions of the order of $50\pm2$ micron and contrasts of about $6.6\pm0.2$ compared to air, offering a new technique in non-destructive Material testing.
Paul Schuetze - One of the best experts on this subject based on the ideXlab platform.
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Simulation of Material Budget measurements with beam telescopes
Proceedings of The 26th International Workshop on Vertex Detectors — PoS(Vertex 2017), 2018Co-Authors: Hendrik Jansen, Paul SchuetzeAbstract:High-precision particle tracking devices allow for a two-dimensional analysis of the Material Budget distribution of, e.g., particle detectors and their periphery. These tracking devices, called beam telescopes, enable a precise measurement of the trajectory of charged particles with a position resolution of a few micrometer and an angular resolution of the order of a few ten microradian. In this contribution, the Material Budget of a structured aluminium cube is reconstructed from various estimators based on the deflection angles of simulated electron trajectories. Probing a target under various rotation angles enables a tomographic reconstruction of the target. We discuss the performance of width estimators of the scattering angle distributions and their impact on the contrast and the resolution of the reconstructed two- and three-dimensional images. At a voxel size of 0.1 mm $\times$ 0.1 mm $\times$ 0.1 mm, we reconstruct the Material Budget with a contrast to noise ratio of $5.6\pm0.2$ and an edge resolution of about $(70\pm10)$ micrometre.
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Feasibility of track-based multiple scattering tomography
Applied Physics Letters, 2018Co-Authors: Hendrik Jansen, Paul SchuetzeAbstract:We present a tomographic technique making use of a gigaelectronvolt electron beam for the measurement of the spatial Material Budget distribution of centimetre-sized objects. With simulation tools originating from high-energy physics applications, a test environment replicating a beam telescope is set up to measure the trajectory of electrons traversing a structured aluminium cube with 6 mm edge length. The variance of the deflection angle distribution of the electrons undergoing multiple Coulomb scattering at the aluminium cube serves as an estimator for the radon transform of the Material Budget distribution. Basing the sinogram on position-resolved estimators enables the reconstruction of the original object. We show the feasibility of the reconstruction of the three-dimensional Material Budget distribution of the aluminium cube by successively imaging two-dimensional distributions of the projected Material Budget under varying rotation angles. Using a filtered back projection, the reconstructed image yields edge resolutions of the order of $50\pm2$ micron and contrasts of about $6.6\pm0.2$ compared to air, offering a new technique in non-destructive Material testing.
Antonio Teixell - One of the best experts on this subject based on the ideXlab platform.
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Crustal structure and orogenic Material Budget in the west central Pyrenees
Tectonics, 1998Co-Authors: Antonio TeixellAbstract:Surface and subsurface data are combined to construct a crustal-scale cross section of the western central Pyrenees (France and Spain) at the boundary between the European and Iberian plates. The position of Moho reflections in the ECORS-Arzacq reflection profile suggests a tectonic wedge of European crust and upper mantle had indented the Iberian plate at lower crustal levels. The European wedge is overlain by an upper, Iberian wedge thus constituting a double (stacked) wedge geometry. The upper wedge was delaminated and deformed giving rise to the Pyrenean orogenic prism, manifested as a bivergent fan in upper crustal levels. The underthrust lower Iberian plate has been imaged to depths of 55-60 km, but crustal Budget considerations based on a palinspastic reconstruction require that this continental root subducted to depths up to 90 km. Total orogenic contraction calculated from surface structures is about 75-80 km, which was accomplished between the latest Cretaceous and the early Miocene at an averaged rate of 1.2 mm/yr. Consistent with these moderate values, exhumation of the orogen is much less than in the more shortened eastern parts of the range. Paleozoic basement and preorogenic Mesozoic rocks are little eroded, and much of the exhumation involved cannibalization of early foreland basins, which once covered the entire, poorly emergent orogen at this transect. This resulted in a continuous process of sediment recycling and, coupled with a considerable lateral arrival of Material, a bulk negative erosion-sedimentation Budget.
M. Bragadireanu - One of the best experts on this subject based on the ideXlab platform.
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The Straw Tube Trackers of the PANDA Experiment
arXiv: Instrumentation and Detectors, 2013Co-Authors: Paola Gianotti, V. Lucherini, E. Pace, G. L. Boca, S. Costanza, P. Genova, L. Lavezzi, P. Montanga, Alberto Rotondi, M. BragadireanuAbstract:The PANDA experiment will be built at the FAIR facility at Darmstadt (Germany) to perform accurate tests of the strong interaction through bar pp and bar pA annihilation's studies. To track charged particles, two systems consisting of a set of planar, closed-packed, self-supporting straw tube layers are under construction. The PANDA straw tubes will have also unique characteristics in term of Material Budget and performance. They consist of very thin mylar-aluminized cathodes which are made self-supporting by means of the operation gas-mixture over-pressure. This solution allows to reduce at maximum the weight of the mechanical support frame and hence the detector Material Budget. The PANDA straw tube central tracker will not only reconstruct charged particle trajectories, but also will help in low momentum (< 1 GeV) particle identification via dE/dx measurements. This is a quite new approach that PANDA tracking group has first tested with detailed Monte Carlo simulations, and then with experimental tests of detector prototypes. This paper addresses the design issues of the PANDA straw tube trackers and the performance obtained in prototype tests.
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The straw tube trackers of the PANDA experiment
2013 3rd International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA), 2013Co-Authors: Paola Gianotti, V. Lucherini, E. Pace, G. L. Boca, S. Costanza, P. Genova, L. Lavezzi, P. Montanga, Alberto Rotondi, M. BragadireanuAbstract:The PANDA experiment will be built at the FAIR facility at Darmstadt (Germany) to perform accurate tests of the strong interaction through pp and pA annihilation's studies. To track charged particles, two systems consisting of a set of planar, closed-packed, self-supporting straw tube layers are under construction. The PANDA straw tubes will have also unique characteristics in term of Material Budget and performance. They consist of very thin mylar-aluminized cathodes which are made self-supporting by means of the operation gas-mixture over-pressure. This solution allows to reduce at maximum the weight of the mechanical support frame and hence the detector Material Budget. The PANDA straw tube central tracker will not only reconstruct charged particle trajectories, but also will help in low momentum (
Paul Schütze - One of the best experts on this subject based on the ideXlab platform.
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Silicon Pixel Detectors - Performance after Irradiation and Application in Three-dimensional Imaging
2019Co-Authors: Paul SchützeAbstract:This dissertation addresses two applications of silicon pixel detectors as tracking devices, namely the applications in high energy physics experiments and in a novel tomographic technique termed Material Budget imaging.For current and future experiments in high energy physics, one of the main challenges for the development of silicon detectors is the immense radiation fluence received over the years of operation.In this thesis, the performance of silicon pixel detectors for the tracking detector of the Compact Muon Solenoid (CMS) experiment is investigated for fluences of up to $\Phi_{eq}= 1.39\times10^{15}$n/cm$^2$ close to the expected lifetime fluence of the innermost layer of the barrel pixel detector. Measurements conducted at the DESY II Test Beam Facility show, that the maximum collected charge is reduced significantly by the high radiation fluences, but that an efficiency of above 99 % can be maintained when applying reasonable bias voltages.The voltage required to fully deplete the sensor rises up to around 600 V.The effective Lorentz angle of unirradiated detector modules and a module irradiated to a fluence of $\Phi_{eq}= 4\times10^{14}$n/cm$^2$ was determined for various bias voltages using a 1.34 T magnetic field.The findings imply that the high bias voltages required for an efficient operation of radiation damaged pixel detectors will impair the resolution of the detector modules significantly.The second application investigated is the use of silicon pixel detectors for an imaging technique aiming to reconstruct the three-dimensional Material distribution of arbitrary samples.Using the high-resolution EUDET-type Beam Telescopes available at the DESY II Test Beam Facility to measure the scattering angle of relativistic particles when traversing a sample allows for the determination of its projected Material Budget in two dimensions.A rotation of the sample and an inverse Radon transform facilitates a reconstruction of the sample's internal structure.Simulations of this technique are presented as well as the first acquired three-dimensional Material Budget images.The simulations and an evaluation of the underlying two-dimensional images indicate a possible resolution of this method of less than 20 $\mu$m at a sufficiently high contrast-to-noise ratio.The potential and the limits of Material Budget imaging as well as possible future applications and developments are discussed.
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Feasibility Study of a Track-Based Multiple Scattering Tomography
Springer Proceedings in Physics, 2018Co-Authors: Paul Schütze, Hendrik JansenAbstract:We propose a new tomographic imaging method based on the multiple Coulomb scattering processes of electrons in the GeV-range. Particle tracking devices are used for a position-resolved measurement of the distribution of scattering angles at a sample. From this, an estimate of the two-dimensional Material Budget distribution of the sample is extracted. Repeating this measurement for different particle incidence angles enables a reconstruction of the three-dimensional Material Budget distribution.
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Scattering Studies with the DATURA Beam Telescope
Springer Proceedings in Physics, 2018Co-Authors: Hendrik Jansen, Paul Schütze, Jan Dreyling-eschweiler, Simon SpannagelAbstract:High-precision particle tracking devices allow for two-dimensional analyses of the Material Budget distribution of particle detectors and their periphery. In this contribution, the Material Budget of different targets is reconstructed from the width of the angular distribution of scattered beam particle at a sample under test. Positrons in the GeV-range serve as beam particles carrying enough momentum to traverse few millimetre thick targets whilst offering sufficient deflection for precise measurement. Reference measurements of the scattering angle distribution of targets of known thicknesses are presented that serve as calibration techniques required for tomographic reconstructions of inhomogeneous objects.