PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Detector R&D and Data Handling
Luminometers for Future Linear Collider Experiments
V. Ghenescu*, W. Lohmann  on behalf of the FCAL Collaboration
Full text: pdf
Pre-published on: September 30, 2020
Published on: November 12, 2020
In order to measure precisely and fast the luminosity in a future experiment at a linear collider like ILC or CLIC two compact and fine grained electromagnetic calorimeters are foreseen, LumiCal and BeamCal. LumiCal will provide a precise measurement of the integrated luminosity by counting Bhabha scattering events at small polar angles, while BeamCal is designed for bunch-by-bunch luminosity measurement and beam tuning when included in a fast feedback system using beam-strahlung. Both detectors will extend the detector coverage to small polar angles, potentially important for tagging high-energy electrons. The performance of a prototype of LumiCal, constructed as a sampling calorimeter with tungsten absorber plates of one X0 thickness and sensor planes with sub-mm thickness, was studied in an electron beam at DESY with momenta between one and 5 GeV. The shower position is measured with a precision of 440±20 microns, and the effective Molière radius is determined for electrons of 5 GeV to be 8.1±0.3mm.
DOI: https://doi.org/10.22323/1.364.0210
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