Abstract
For the next generation of calorimeters, designed to improve the energy resolution of hadrons and jets measurements, there is a need for highly granular detectors requiring peculiar geometries. Heavy inorganic scintillators allow compact homogeneous calorimeter designs with excellent energy resolution and dual-readout abilities.These scintillators are however not usually suited for geometries with a high aspect ratio because of the important losses observed during the light propagation. Elongated single crystals (fibers) of Lutetium Aluminium garnet (LuAG, Lu3Al5O12) were successfully grown with the micropulling-down technique. We present here the results obtained with the recent fiber production and we discuss how the light propagation could be enhanced to reach attenuation lengths in the fibers better than 0.5 m.
Highlights
To circumvent the limitations of these two concepts, we proposed earlier a third approach based on meta-crystals [5, 6]
We presented here the significant improvement of the light propagation in single crystalline LuAG fibers grown by the micro-pulling down technology
The difference between the light attenuation length and the light absorption length was earlier explained based on a model where total reflections where assumed not to occur without losses [25]
Summary
To circumvent the limitations of these two concepts, we proposed earlier a third approach based on meta-crystals [5, 6] In this concept, trunks of cables constructed from heavy inorganic single crystalline fibers are assembled to form the detector blocks. Extrinsic scintillators consist of materials doped with luminescent ions When undoped, they often do not emit light under ionizing radiation (or at least, the scintillation yield is significantly lower at room temperature and exhibit a different time response). They often do not emit light under ionizing radiation (or at least, the scintillation yield is significantly lower at room temperature and exhibit a different time response) Both doped and undoped materials can be assembled to measure respectively the scintillation and Cherenkov signals. The system is capable of disentangling the electromagnetic (em) and non-em components of a shower with a uniform Moliere radius RM, radiation and interaction lengths X0 and λI
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