X-ray polarimetry by means of Compton scattering in the sensor of a hybrid photon counting pixel detector

Michel, Thilo; Durst, Jürgen; Jakůbek, J.

doi:10.1016/j.nima.2009.02.032

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…= 80%. This represented an improvement of ∼29% compared to previous work [46] using Timepix in a similar experiment (finding a modulation of 62%).…”

Section: Compton Scatter Polarimetrymentioning

confidence: 45%

“…where µ 100 denotes the modulation response to a 100% polarized X-ray impact, which can be calibrated in simulation [46] or in a field of known polarization. In this section, the state of SATRAM in terms of radiation-induced effects on data quality shall be quantified.…”

Section: Single-layer Compton Camera and Scatter Polarimetrymentioning

confidence: 99%

“…We can assess the performance of the device according to the minimum detectable polarization (MDP) at a 99% confidence level describing the degree of linear polarization detectable within a given acquisition time. Neglecting the background, it can be estimated as [46] MDP 99% = 4.29…”

Section: Compton Scatter Polarimetrymentioning

confidence: 99%

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Results and Perspectives of Timepix Detectors in Space—From Radiation Monitoring in Low Earth Orbit to Astroparticle Physics

Bergmann,

Gohl,

Garvey

et al. 2024

Instruments

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In space application, hybrid pixel detectors of the Timepix family have been considered mainly for the measurement of radiation levels and dosimetry in low earth orbits. Using the example of the Space Application of Timepix Radiation Monitor (SATRAM), we demonstrate the unique capabilities of Timepix-based miniaturized radiation detectors for particle separation. We present the incident proton energy spectrum in the geographic location of SAA obtained by using Bayesian unfolding of the stopping power spectrum measured with a single-layer Timepix. We assess the measurement stability and the resiliency of the detector to the space environment, thereby demonstrating that even though degradation is observed, data quality has not been affected significantly over more than 10 years. Based on the SATRAM heritage and the capabilities of the latest-generation Timepix series chips, we discuss their applicability for use in a compact magnetic spectrometer for a deep space mission or in the Jupiter radiation belts, as well as their capability for use as single-layer X- and γ-ray polarimeters. The latter was supported by the measurement of the polarization of scattered radiation in a laboratory experiment, where a modulation of 80% was found.

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“…= 80%. This represented an improvement of ∼29% compared to previous work [46] using Timepix in a similar experiment (finding a modulation of 62%).…”

Section: Compton Scatter Polarimetrymentioning

confidence: 45%

Section: Single-layer Compton Camera and Scatter Polarimetrymentioning

confidence: 99%

See 1 more Smart Citation

Results and Perspectives of Timepix Detectors in Space—From Radiation Monitoring in Low Earth Orbit to Astroparticle Physics

Bergmann,

Gohl,

Garvey

et al. 2024

Instruments

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show abstract

“…Usage as a single-layer Compton camera (CC) and scatter polarimeter Individual-particle detection, 3D reconstruction and a decent spectroscopic performance provide the means of using the device as a single-layer CC and scatter polarimeter [28], e.g. localization of γ-sources during nuclear decommissioning activities [29], or for studying γ-ray sources in astroparticle physics.…”

Section: 3mentioning

confidence: 99%

“…In addition to CC source location reconstruction, the polarization of the incoming photon field can be determined by evaluating the azimuthal angle between  r e and ¢ g  r within the reference system defined by the sensor [28,32]. As discussed in [32], finer detector segmentation directly impacts the sensitivity to polarization.…”

Section: 3mentioning

confidence: 99%

Characterization of a 5 mm thick CZT-Timepix3 pixel detector for energy-dispersive γ-ray and particle tracking

Smolyanskiy,

Bergmann,

Burian

et al. 2023

Phys. Scr.

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The present manuscript describes a comprehensive characterization of a novel highly segmented 5 mm CZT sensor attached to Timepix3. First, the sensor’s IV curve was measured and basic sensor characterization was done with laboratory γ-radiation sources. The sensor resistivity was determined to be (0.155± 0.02) GOhm · cm. The sensor showed decent homogeneity, both for the per-pixel count rate and electron mobility-lifetime product μ e τ e. The latter was measured to be μ e τ e ¯ = 1.3 × 10−3 cm2/V with a standard deviation σ = 0.4 × 10−3 cm2/V describing the dispersion of values for different pixels. The basic sensor characterization is complemented by measurements at grazing angle in a 120 GeV/c at the CERN’s Super Proton Synchrotron. The penetrating nature of these particles together with the pixelation of the sensor allows for a determination of the charge collection efficiency (CCE), as well as charge carrier drift properties (drift times, lateral charge cloud expansion) as a function of the interaction depths in the sensor. While CCE drops by 30%–40% towards the cathode side of the sensor, from the drift time dependency on interaction depth, the electron mobility μ e was extracted to be (944.8 ± 1.3) cm2/V/s and τ e = (1.38 ± 0.31) μs. The spectroscopic performance was assessed in photon fields and extracted from energy loss spectra measured at different angles in the pion beam. While at photon energies below 120 keV incomplete charge collection leads to an underestimation of the photon energy when irradiated from the front-side, at higher energies the relative energy resolution was found to be ∼4.5%, while a relative energy resolution of ∼7.5% was found for the particle energy loss spectra. It is shown that the drift time information can be used to reconstruct particle interactions in the sensor in 3D, providing a spatial resolution of σ xyz = 241 μm within the sensor volume and a particle trajectory measurement precision Δxyz = 100 μm, at a distance of 1 m from the sensor. We demonstrate by measurement with a 22Na source, that the energy resolution combined with the 3D reconstruction allows for detection of γ-ray source location and polarity using Compton scattering within the sensor (Compton camera and scatter polarimeter).

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Rauschfreie Röntgenbilder mit Medipix. Bildgebende Pixeldetektoren

Anton

Michel

2010

Physik in unserer Zeit

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Die photonenzählenden, bildgebenden Pixeldetektoren entstammen einer Entwicklung aus der Teilchenphysik. Sie bieten als bildgebende Verfahren mannigfaltige Anwendungsmöglichkeiten im Bereich der Grundlagenforschung, Medizin und Materialforschung. Ein gutes Beispiel sind die Generationen des Medipix‐Röntgendetektors, die in einer großen Kollaboration aus dem CERN heraus entstanden sind. Ein besonderer Vorteil ist ihre Fähigkeit, auch schwache Röntgensignale in rauschfreie Bilder umzusetzen. Die Technik ermöglicht eine hohe örtliche, zeitliche und energetische Auflösung der Messsignale. Ein Hybriddetektor auf Basis der Medipix‐Technologie kann auch einzelne Photonen des sichtbaren Spektrums hochempfindlich messen.

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X-ray polarimetry by means of Compton scattering in the sensor of a hybrid photon counting pixel detector

Cited by 12 publications

References 16 publications

Results and Perspectives of Timepix Detectors in Space—From Radiation Monitoring in Low Earth Orbit to Astroparticle Physics

Results and Perspectives of Timepix Detectors in Space—From Radiation Monitoring in Low Earth Orbit to Astroparticle Physics

Characterization of a 5 mm thick CZT-Timepix3 pixel detector for energy-dispersive γ-ray and particle tracking

Rauschfreie Röntgenbilder mit Medipix. Bildgebende Pixeldetektoren

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