Test beam results of a high granularity LuAG fibre calorimeter prototype

Abstract

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)

Needs, Trends, and Advances in Inorganic Scintillators

“…A new concept of calorimetry was proposed in 2008 [150] for future collider experiments. This approach, based on metacrystal cables, consists of replacing conventional blocks of scintillating material with bunches of scintillating fibers of dense materials [151], enabling a higher granularity and more flexibility in the detector design [152], [153]. A significant research and development effort has been carried out over the last few years in the frame of the CCC [1] to develop this growing method in order to optimize the production of longfiber heavy scintillators in view of a future mass production at industrial scale (French ANR project INFINHI [154]), and more recently, a Marie Slowdowska Marie cure RISE project Intelum (grant number 644260) [155]).…”

Progress in fabrication of long transparent YAG:Ce and YAG:Ce,Mg single crystalline fibers for HEP applications

“…For instance, a feasibility of dual registration of Cherenkov and scintillation light by undoped and Ce-doped LuAG fibers, correspondingly, was shown 1 . Long >20 cm fibers with a good transparency (attenuation length Latt > 40 cm) are needed to minimize light losses 1 . Different methods to obtain garnet fibers with the required parameters have been under discussion, for instance, cutting bulk crystals 2 obtained by the Czochralski method.…”

Dual Cherenkov and Scintillation Response to High-Energy Electrons of Rare-Earth-Doped Silica Fibers

“…Current and future ionizing-radiation detectors need novel materials and concepts to improve and optimize their performances. The idea of fiber-shaped scintillation sensors has recently been developed: their application perspectives include devices for real-time dosimetry in medical systems [1], devices for beam monitoring and tracking [2], and high-granularity calorimeters for highenergy-physics (HEP) experiments [3][4][5][6]. On the basis of the possibility of growing a great variety of fiber shapes and lengths, several calorimeter designs have been proposed [7], exploiting the flexibility of fibers to adapt for various needs.…”