ECFA Detector R&D Panel, Review Report

Abstract

Two special calorimeters are foreseen for the instrumentation of the very forward region of an ILC or CLIC detector; a luminometer (LumiCal) designed to measure the rate of low angle Bhabha scattering events with a precision better than 10${}^{-3}$ at the ILC and 10${}^{-2}$ at CLIC, and a low polar-angle calorimeter (BeamCal). The latter will be hit by a large amount of beamstrahlung remnants. The intensity and the spatial shape of these depositions will provide a fast luminosity estimate, as well as determination of beam parameters. The sensors of this calorimeter must be radiation-hard. Both devices will improve the e.m. hermeticity of the detector in the search for new particles. Finely segmented and very compact electromagnetic calorimeters will match these requirements. Due to the high occupancy, fast front-end electronics will be needed. Monte Carlo studies were performed to investigate the impact of beam-beam interactions and physics background processes on the luminosity measurement, and of beamstrahlung on the performance of BeamCal, as well as to optimise the design of both calorimeters. Dedicated sensors, front-end and ADC ASICs have been designed for the ILC and prototypes are available. Prototypes of sensor planes fully assembled with readout electronics have been studied in electron beams.

61 pages, 51 figures

References in corpus (8)

• ILC Reference Design Report Volume 1 - Executive Summary
• Forward Instrumentation for ILC Detectors
• Luminosity Measurement at the International Linear Collider
• Simulation of Beam-Beam Background at CLIC
• Studies on the Electron Reconstruction Efficiency for the Beam Calorimeter of an ILC Detector
• Physics background at ILC at 500GeV and 1TeV
• Correction of beam-beam effects in luminosity measurement at ILC
• Beam Calorimeter Technologies