The 10 Na2O-(30-x) MoO3- 60H3BO3-xSb2O3 glass system was prepared using the melt-quenching technique, where 30 ≥ x ≥ 10 mol%. X-ray diffraction and Fourier transform infrared spectroscopy were used ...to investigate the amorphous nature of the glass structure and the impacts of MoO3 and Sb2O3. As the antimony trioxide (Sb2O3) concentration increases at the expense of molybdenum trioxide (MoO3), the density and molar volume increase, and the optical bandgap energy and refractive index also increase. The radiation shielding characteristics were measured using a NaI(Tl) scintillation detector and calculated using the Phy-X/PSD platform. The increase in Sb2O3 concentration increases the values of μm and Zeff but decreases the HVL and MFP, indicating that the produced glass samples, which contain no lead or barium, have mass attenuation coefficients and effective atomic numbers comparable to those of samples with higher Pb or barium contents. Furthermore, all the prepared samples were found to have greater gamma attenuation than Portland and Barite concrete.
•10 Na2O-(30-x) MoO3- 60H3BO3-xSb2O3 glass system has been prepared, where 30 ≥ x ≥ 10 mol%.•Optical parameters are investigated.•Gamma ray attenuation properties are investigated.•Exposure build-up factor, the equivalent, and the effective atomic number are calculated.•XRD and FTIR for the prepared glasses are made.
The status of the GEM project for CMS high-η muon system Abbaneo, D.; Abbrescia, M.; Armagnaud, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2013, Letnik:
732
Journal Article
Recenzirano
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The dedicated CMS R&D program was intended to study the feasibility of using micropattern detectors for the instrumentation of the vacant |η|>1.6 region in the present Resistive Plate Chambers (RPCs) ...endcap system. The proposed detector for CMS is a Triple-Gas Electron Multiplier (GEM) trapezoidal chamber, equipped with 1D readout. While during 2010–2011 the Collaboration worked on the prototyping of the detector, during the first part of 2012 a newly developed assembly technique to be used for the mass production was adopted. GEMs can provide precision tracking and fast trigger information, contributing on one hand to the improvement of the CMS muon Trigger and on the other hand to provide the missing redundancy in the high η region. In the view of the next LHC long shutdown (LS1) the CMS GEM Collaboration designed and built four full-size Triple GEM-based muon detectors.
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