paper

Performance of a spaghetti calorimeter prototype with tungsten absorber and garnet crystal fibres

arXiv:2205.02500 · doi:10.1016/j.nima.2022.167629

Abstract

A spaghetti calorimeter (SPACAL) prototype with scintillating crystal fibres was assembled and tested with electron beams of energy from 1 to 5 GeV. The prototype comprised radiation-hard Cerium-doped Gd $_{3}$ Al $_{2}$ Ga $_{3}$ O $_{12}$ (GAGG:Ce) and Y $_{3}$ Al $_{5}$ O $_{12}$ (YAG:Ce) embedded in a pure tungsten absorber. The energy resolution was studied as a function of the incidence angle of the beam and found to be of the order of $10%/ E \oplus 1%$ , in line with the LHCb Shashlik technology. The time resolution was measured with metal channel dynodes photomultipliers placed in contact with the fibres or coupled via a light guide, additionally testing an optical tape to glue the components. Time resolution of a few tens of picosecond was achieved for all the energies reaching down to (18.5 $\pm$ 0.2) ps at 5 GeV.

14 pages, 8 figures, published on NIM A