A simulation study on the focal plane detector of the LAUE project

Khalil, Mohamad; Frontera, F.; Caroli, E.; Virgilli, Enrico; Valsan, Vineeth

doi:10.1016/j.nima.2015.03.004

Cited by 7 publications

(10 citation statements)

References 14 publications

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“…Other effects that may degrade the resolution in a pixel detector concern the collection of the signal generated by the photons and the charge sharing. Since a pixel detector may reach a resolution of some hundreds of μm for these photon energies (Caroli et al 2005;Khalil et al 2015), the point spread function recorded in a detector would be approximately as wide as the photon distribution at the focal plane for the cases considered in this paper. Fig.…”

Section: Discussionmentioning

confidence: 99%

Laue lens for astrophysics: Extensive comparison between mosaic, curved, and quasi-mosaic crystals

Camattari

2016

A&A

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With the aim of concentrating hard X-and γ-rays coming from celestial sources in the 100-1000 keV energy range, the concept of Laue lens was introduced more than 50 years ago. Crystals are the core of a Laue lens, since they focus the incoming X-rays through Bragg diffraction. For concrete applications, crystals characterized by high diffraction reflectivity are needed along with high-resolution focusing of diffracted photons. Here, an extensive comparison of the types of crystals proposed so far is presented. In order to quantify the focusing capability of a Laue lens based on these crystals, a simulation of a single-ring Laue lens based on the considered optical elements is presented. Finally, the breakthrough in the panorama of diffracting crystals is discussed.

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Section: Discussionmentioning

confidence: 99%

Laue lens for astrophysics: Extensive comparison between mosaic, curved, and quasi-mosaic crystals

Camattari

2016

A&A

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“…As discussed in our paper by Khalil et al [17], a Germanium detector is a good candidate as focal plane position sensitive detector of the focused photons, with a pixel size of 350 µm × 350 µm, a cross section of 10 × 10 cm 2 and a thickness of 12.5 cm or higher. In such a way a high detection efficiency (80%) can be achieved up to the highest energies of the lens pass band (650 keV).…”

Section: Expected Detection Efficency and Instrument Backgroundmentioning

confidence: 93%

“…Concerning the instrument backgound, for our simulations the Laue lens is assumed to be placed in a Low Earth Orbit (LEO). Following the same procedure discussed in our paper by Khalil et al [17], from the background data in the energy band from 90 -600 keV measured by SPI instrument onboard the INTEGRAL satellite in High Earth Orbit, we have derived the background level expected for the lens. The result is shown in Fig.…”

Section: Expected Detection Efficency and Instrument Backgroundmentioning

confidence: 99%

Simulation of a Laue lens with bent Ge(111) crystals

Valsan,

Virgilli,

Frontera

et al. 2015

Preprint

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In the context of Laue project for focusing hard X-/ soft gammarays, an entire Laue lens, using bent Ge(111) crystal tiles, with 40 meters curvature radius, is simulated with a focal length of 20 meters. The focusing energy band is between 80 keV and 600 keV. The distortion of the output image of the lens on the focal plane due to the effect of crystal tile misalign.ment as well as the radial distortion arising from the curvature of the crystal is discussed in detail. Expected detection efficiency and instrument background is also estimated. Finally the sensitivity of the Laue lens is calculated. A quantitative analysis of the results of these simulation is also presented.

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“…where E L is the line centroid, I c (E L ) is the source continuum intensity at the line centroid, E is the FWHM of the line profile that depends upon the energy resolution of the detector which has been assumed to be 2 keV (expected for our simulated detector; [46]). The other parameters, all calculated at the energy E L , are those defined above.…”

Section: -Sensitivity To Narrow Emission Linesmentioning

confidence: 99%

Understanding the origin of the positron annihilation line and the physics of supernova explosions

et al. 2021

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Nuclear astrophysics, and particularly nuclear emission line diagnostics from a variety of cosmic sites, has remained one of the least developed fields in experimental astronomy, despite its central role in addressing a number of outstanding questions in modern astrophysics. Radioactive isotopes are co-produced with stable isotopes in the fusion reactions of nucleosynthesis in supernova explosions and other violent events, such as neutron star mergers. The origin of the 511 keV positron annihilation line observed in the direction of the Galactic Center is a 50-year-long mystery. In fact, we still do not understand whether its diffuse large-scale emission is entirely due to a population of discrete sources, which are unresolved with current poor angular resolution instruments at these energies, or whether dark matter annihilation could contribute to it. From the results obtained in the pioneering decades of this experimentally-challenging window, it has become clear that some of the most pressing issues in high-energy astrophysics and astro-particle physics would greatly benefit from significant progress in the observational capabilities in the keV-to-MeV energy band. Current instrumentation is in fact not sensitive enough to detect radioactive and annihilation lines from a wide variety of phenomena in our and nearby galaxies, let alone study the spatial distribution of their emission. In this White Paper (WP), we discuss how unprecedented studies in this field will become possible with a new low-energy gamma-ray space experiment, called ASTENA (Advanced Surveyor of Transient Events and Nuclear Astrophysics), which combines new imaging, spectroscopic and polarization capabilities. In a separate WP (Guidorzi et al. 39), we discuss how the same mission concept will enable new groundbreaking studies of the physics of Gamma–Ray Bursts and other high-energy transient phenomena over the next decades.

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A simulation study on the focal plane detector of the LAUE project

Cited by 7 publications

References 14 publications

Laue lens for astrophysics: Extensive comparison between mosaic, curved, and quasi-mosaic crystals

Laue lens for astrophysics: Extensive comparison between mosaic, curved, and quasi-mosaic crystals

Simulation of a Laue lens with bent Ge(111) crystals

Understanding the origin of the positron annihilation line and the physics of supernova explosions

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