High resolution multielement XRF spectroscopy of extended and diffused sources with a graphite mosaic crystal based Von Hamos spectrometer

Abstract

High resolution Bragg spectroscopy from millimetric size sources has been performed in 6–20 keV range with the VOXES HAPG spectrometer.

Reflection efficiency and spectra resolutions ray-tracing simulations for the VOXES HAPG crystal based Von Hamos spectrometer

“…The target foil is activated by the X-ray tube and the Kα 1,2 lines, isotropically emitted, are collimated by the slits system to simulate a point-like source. An example of the resulting spectrum, after performing the calibration and fitting procedure reported in our previous work [5], is shown in the Fig. 2.…”

“…Figure 2: Copper Bragg spectrum where the overall fitting function (red), the polynomial background (blue) and the Kα 1 (green) and Kα 2 (violet) components are over imposed to the spectrum for ∆θ=0.7 and S 0 =1.1 mm, elaborated from [5] (see text for details).…”

“…where the ratio between the beam vertical dimension A c and 8 mm accounts for the difference between the MTYTHEN2 strip height and the XRF beam spot vertical size on the HAPG. A c is evaluated, following the procedure described in [5], from the slits positions and dimensions. The reflection efficiencies, obtained with a ρ = 206.7 mm HAPG crystal for both Cu Kα1,2 F e Kα1,2 XRF lines, from Eq.…”

“…This technology is suitable to be used in the Von Hamos configuration combining the standard dispersion of a flat crystal with the focusing properties of cilindrically bent crystals. Several studies aimed to analyze the effect on the energy resolution, of the precision of the mosaicity and thickness of the crystal have been already performed and the capability of the spectrometer to be optimized in order to achieve the best precision has been also demonstrated [4,5]. The performance of the spectrometer has been lately studied in terms of reflection efficiency [6] and in this work we want to focus on the ray-tracing simulations implemented in order to check the agreement with the experimental results.…”

HAPG mosaic crystal Von Hamos spectrometer for high precision kaonic atoms spectroscopy

“…1 left and right, respectively. A full and comprehensive description of all the components of the VOXES spectrometer, the definition of the geometrical parameters both in the Bragg and the vertical plane, together with deep investigations of the dependance of the VOXES spectrometer capabilities with respect to the crystal mosaicity, thickness and curvature radius can be found in our previous works [7][8][9]. In particular, in [8] the geometrical configurations in terms of 0 , Δ pairs leading to the best achievable precisions and resolutions for measurements of Fe, Cu, Zn, Mo, Nb transitions can be found; as an example, being the 3,4 3 → 2 transition energies at 6, 2…”