Full concentration range of Lu 2x Gd 2-2x SiO 5 (LGSO:Ce) crystals was grown by the Czochralski method. Dependence of scintillation properties on composition (х) in the range of solid solutions is established. It was determined that LGSO:Ce scintillation yield increases in the range 0.3<х< 0.8 and reaches 29000 phot/MeV at 60% of Lu in the host (x=0.6), and energy resolution improves up to 6.7 % at 662 KeV. The observed light yield increase, surprisingly high Ce

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A: The progresses in the micropulling-down technique allow heavy scintillating crystals to be grown directly into a fibre geometry of variable shape, length and diameter. Examples of materials that can be grown with this technique are Lutetium Aluminum Garnets (LuAG, Lu 3 Al 5 O 12 ) and Yttrium Aluminum Garnets (YAG, Y 3 Al 5 O 12 ). Thanks to the flexibility of this approach, combined with the high density and good radiation hardness of the materials, such a technology represents a powerful tool for the development of future calorimeters. As an important proof of concept of the application of crystal fibres in future experiments, a small calorimeter prototype was built and tested on beam. A grooved brass absorber (dimensions 26 cm × 7 cm × 16 cm) was instrumented with 64 LuAG fibres, 56 of which were doped with Cerium, while the remaining 8 were undoped. Each fibre was readout individually using 8 eightfold Silicon Photomultiplier arrays, thus providing a highly granular description of the shower development inside the module as well as good tracking capabilities. The module was tested at the Fermilab Test Beam Facility using electrons and pions in the 2-16 GeV energy range. The module performance as well as fibre characterization results from this beam test are presented. K: Calorimeter methods; Calorimeters; Scintillators and scintillating fibres and light guides; Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)

A significant enhancement in the light attenuation length in 22–55 cm long YAG:Ce and YAG:Ce,Mg fibers grown by the micro-pulling-down method has been reported.

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The influence of the reducing Ar+CO atmosphere on the stages of starting raw material preparation, growth and post-growth annealing of yttrium aluminium garnet, Y3Al5O12 (YAG) crystals was studied. The chemical reactions involving CO atmosphere and its impact on the raw material, melt, and crystal composition are determined. Modification of YAG optical properties under the reducing annealing is discussed.

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