Possible Polarization Measurements in Elastic Scattering at the Gamma Factory Utilizing a 2D Sensitive Strip Detector as Dedicated Compton Polarimeter

Middents, Wilko; Weber, G.; Spillmann, U.; Krings, T.; Vockert, M.; Volotka, A. V.; Surzhykov, A.; Stöhlker, Thomas

doi:10.1002/andp.202100285

Cited by 6 publications

(3 citation statements)

References 33 publications

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“…In contrast, the dependence on the azimuthal angle ϕ can be observed when utilizing linearly polarized incident radiation. Such radiation can be induced and investigated by dedicated polarimeters [30][31][32] and, moreover, is usually available at synchrotron radiation facilities [33][34][35][36].…”

Section: Theoretical Sectionmentioning

confidence: 99%

Experimental determination of differential scattering coefficients for nickel by means of linearly polarized x-ray radiation

et al. 2023

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Performing an X-ray scattering analysis can underpin the quantitative description of a sample of interest, for example, to complement an X-ray fluorescence analysis. However, the reliability of such an analytical approach depends on good knowledge of scattering coefficients (or scattering cross-sections), which describe the probability of interaction and are characteristic of each chemical element. In this work, a metrological study of experimentally determining differential Rayleigh and Compton scattering coefficients for nickel is presented. Angular scans of the scattering intensities at different positions are enabled by a flexible experimental set-up and, therefore, allow for the robust determination of differential scattering coefficients at a wide range of forward and backward scattering angles. As a result, scattering coefficients in the range from 0.117(14) × 10-3 cm2 g-1 sr-1 to 33.7(39) × 10-3 cm2 g-1 sr-1 were determined in the momentum transfer range of 12.1 nm-1 to 22.4 nm-1. In addition, utilizing monochromatized and highly linearly polarized synchrotron radiation (E0=30 keV) ensures direct comparability to theoretical databases.

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Section: Theoretical Sectionmentioning

confidence: 99%

Experimental determination of differential scattering coefficients for nickel by means of linearly polarized x-ray radiation

et al. 2023

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“…The detector shown in Fig. 3(a) was constructed within the SPARC collaboration for this purpose as a dedicated Compton polarimeter [15]. Up to now it consists of a lithium-diffused silicon crystal allowing an efficient use of the detector for photon energies up to 200 keV.…”

Section: Pos(pstp2022)028mentioning

confidence: 99%

Towards experiments with polarized beams and targets at the GSI/FAIR storage rings

Stoehlker¹

2023

Proceedings of 19th Workshop on Polarized Sources, Targets and Polarimetry — PoS(PSTP2022)

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The exploitation of polarization degrees of freedom of hadron beams and/or targets offers a wealth of observables that are not accessible with unpolarized particles. These observables can be used to test the conservation or violation of fundamental symmetries like parity, charge conjugation, time reversal or combinations thereof. This paper describes some of the physics that can be pursued with polarized hadron beams or polarized targets using the CRYRING and the Experimental Storage Ring (ESR) at GSI/FAIR in Darmstadt after the completion of the experimental program with the Cooler Synchrotron COSY at Forschungszentrum Jülich.

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“…Recently, great progress has been achieved in the development of polarization-sensitive X-ray detectors. In particular, state-of-the-art solid-state Compton scatterers allow for a highly precise determination of the linear polarization of photons in the energy range between about 60 keV up to 1 MeV [1,2]. It was shown that the uncertainty of the polarization reconstruction using such polarimeters is mainly limited by the statistics of registered Compton scattering events in the detector and can be reduced to below 1% [3].…”

Section: Introductionmentioning

confidence: 99%

Circular Polarimetry of Hard X-rays with Rayleigh Scattering

Strnat

Sommerfeldt

Yerokhin

et al. 2022

Atoms

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We present a theoretical investigation of the elastic Rayleigh scattering of X-rays by atomic targets. Special attention is paid to the question of how the polarization of the scattered photons is affected if the incident light is itself polarized. In particular, we found that the circular polarization of the incoming X-rays may lead to a remarkable modification of the linear polarization of the scattered photons. Based on this ’circular-to-linear-polarization-transfer’ and on the fact that the linear polarization of X-rays can be conveniently observed by solid-state Compton detectors, we argue that Rayleigh scattering may be used as a tool for circular polarimetry of hard X-rays. To illustrate our proposal, we performed detailed calculations of 145 and 500 keV circularly polarized photons scattered by lead atoms. Based on these calculations, we found that the photon scattering under large angles with respect to the incident beam direction is most favorable for the circular polarimetry of hard X-rays. In particular, for 500 keV photon energy and scattering angles around 70 deg we found a remarkable modification of the linear polarization of scattered light for the case when the incident radiation is circularly polarized.

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Possible Polarization Measurements in Elastic Scattering at the Gamma Factory Utilizing a 2D Sensitive Strip Detector as Dedicated Compton Polarimeter

Cited by 6 publications

References 33 publications

Experimental determination of differential scattering coefficients for nickel by means of linearly polarized x-ray radiation

Experimental determination of differential scattering coefficients for nickel by means of linearly polarized x-ray radiation

Towards experiments with polarized beams and targets at the GSI/FAIR storage rings

Circular Polarimetry of Hard X-rays with Rayleigh Scattering

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