Proposal for a Laue lens relying on hybrid quasi-mosaic curved crystals

Bellucci, Valerio; Camattari, Riccardo; Guidi, V.

doi:10.1051/0004-6361/201322053

Cited by 19 publications

(15 citation statements)

References 24 publications

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“…Due to the wealth of diffracting planes with different d-spacing, a large Laue lens was simulated through the LaueGen code. In fact, it has been demonstrated that (311) QM crystals can be profitably used to improve the performance of a Laue lens solely relying on (111) and (422) QM crystals [14]. However, some improvements still have to be accomplished, in order to increase the effective area without increasing the diameter of the lens.…”

Section: Discussionmentioning

confidence: 99%

“…Diffraction with curved QM samples has previously been tested exploiting (111) and (422) QM planes, in [13] and [14] respectively. Another set of crystallographic planes that could be used for high-efficiency diffraction are the (311), which can be bent through the QM effect, as shown in Fig 1. In this case, the ratio between the QM and the primary radius of curvature is equal to R QM /R p = 3.455, as can be calculated through the linear theory of elasticity for anisotropic media, following the same procedure explained in [14].…”

Section: Curved Quasi-mosaic Crystalsmentioning

confidence: 99%

“…Since the primary curvature of the crystals must fit the radius of curvature of the calotte of the lens for focusing the diffracted photons, the QM curvature of the samples turns out to be fixed by the theory of linear elasticity in anisotropic medium [14]. The ratios between the QM and the primary curvatures for the cases of interest are listed in Table 3.…”

Section: Simulation Of a Laue Lens With Qm Crystals With The Lauegen mentioning

confidence: 99%

“…The same genetic algorithm was used in [14]. We initialized LaueGen by starting with an a priori initial guess for the tile arrangement, taking into account the different Bragg angles.…”

Section: Simulation Of a Laue Lens With Qm Crystals With The Lauegen mentioning

confidence: 99%

“…Unlike for curved (111) and (422) diffracting planes, for which the QM effect has already been proved in silicon and germanium crystals [13,14], diffraction through (311) planes had never been observed to date. Therefore, we experimentally demonstrated that the QM effect holds for these planes (Section 3) and analyzed their diffraction pattern.…”

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confidence: 98%

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Quasi-mosaicity of (311) planes in silicon and its use in a Laue lens with high-focusing power

et al. 2014

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(311) curved planes can be exploited for efficiently focus hard X-rays. With this purpose, a self-standing bent crystal was manufactured at the Sensor and Semiconductor Laboratory of Ferrara (Italy). The crystal was designed as an optical component for a X-ray concentrator such as a Laue lens. The curvature of (311) planes was obtained through the quasi-mosaic effect. The diffraction efficiency of the sample was tested at the Institut Laue Langevin of Grenoble (France) by using a collimated monochromatic X-ray beam. This was the first prove of the diffraction properties of (311) quasi-mosaic planes. Diffraction efficiency resulted 35% with a 182 keV X-ray beam, in agreement with the theoretical expectation. It corresponded to a reflectivity of 33%. While the chosen orientation is not the most performing lying of planes, it can be used, in addition to smaller-index planes, in order to raise the total effective area of a Laue lens. To quantify it, a Laue lens based on quasi-mosaic silicon and germanium crystals, exploiting (111), (422) and (311) diffracting planes, was achieved and simulated with the LaueGen code

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Section: Discussionmentioning

confidence: 99%

Section: Curved Quasi-mosaic Crystalsmentioning

confidence: 99%

Section: Simulation Of a Laue Lens With Qm Crystals With The Lauegen mentioning

confidence: 99%

“…The same genetic algorithm was used in [14]. We initialized LaueGen by starting with an a priori initial guess for the tile arrangement, taking into account the different Bragg angles.…”

Section: Simulation Of a Laue Lens With Qm Crystals With The Lauegen mentioning

confidence: 99%

mentioning

confidence: 98%

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Quasi-mosaicity of (311) planes in silicon and its use in a Laue lens with high-focusing power

et al. 2014

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Stack of quasi-mosaic thin lamellae as a diffracting element for Laue lenses

et al. 2014

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Crystals with curved diffracting planes have been investigated as high-efficiency optical components for the realization of a Laue lens for satellite-borne experiments in astrophysics. Curved crystals implementing the quasi-mosaic effect, namely an effect of crystalline anisotropy, are able to focus an X-ray beam to a size far smaller than that of the diffracting element, in turn increasing the focusing power of a Laue lens. This work provides first results about the feasibility of a self-standing stack composed of quasi-mosaic crystals. Stacking of crystalline lamellae is a solution to overcome the thickness limitation in existing self-standing quasi-mosaic crystals. Ten thin silicon crystalline lamellae were stacked, and then the planes affected by the quasi-mosaic effect were tested by polychromatic X-ray diffraction. The multicrystal behaved as one diffracting element, yielding a broad and smooth diffraction profile. The effective realization of a quasi-mosaic multicrystal opens up the prospective of building a Laue lens with a large integrated reflectivity, which leads to a high sensitivity, a necessary condition for the observation of celestial X-ray sources via a Laue lens

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Genetic algorithm to design Laue lenses with optimal performance for focusing hard X- andγ-rays

Camattari

Guidi

2014

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To focus hard X-and γ-rays it is possible to use a Laue lens as a concentrator. With this optics it is possible to improve the detection of radiation for several applications, from the observation of the most violent phenomena in the sky to nuclear medicine applications for diagnostic and therapeutic purposes. We implemented a code named LaueGen, which is based on a genetic algorithm and aims to design optimized Laue lenses. The genetic algorithm was selected because optimizing a Laue lens is a complex and discretized problem. The output of the code consists of the design of a Laue lens, which is composed of diffracting crystals that are selected and arranged in such a way as to maximize the lens performance. The code allows managing crystals of any material and crystallographic orientation. The program is structured in such a way that the user can control all the initial lens parameters. As a result, LaueGen is highly versatile and can be used to design very small lenses, for example, for nuclear medicine, or very large lenses, for example, for satellite-borne astrophysical missions.

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Proposal for a Laue lens relying on hybrid quasi-mosaic curved crystals

Cited by 19 publications

References 24 publications

Quasi-mosaicity of (311) planes in silicon and its use in a Laue lens with high-focusing power

Quasi-mosaicity of (311) planes in silicon and its use in a Laue lens with high-focusing power

Stack of quasi-mosaic thin lamellae as a diffracting element for Laue lenses

Genetic algorithm to design Laue lenses with optimal performance for focusing hard X- andγ-rays

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