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Two special calorimeters are foreseen for the instrumentation of the veryforward region of an ILC or CLIC detector; a luminometer (LumiCal) designed tomeasure the rate of low angle Bhabha scattering events with a precision betterthan 10$^{-3}$ at the ILC and 10$^{-2}$ at CLIC, and a low polar-anglecalorimeter (BeamCal). The latter will be hit by a large amount ofbeamstrahlung remnants. The intensity and the spatial shape of thesedepositions will provide a fast luminosity estimate, as well as determinationof beam parameters. The sensors of this calorimeter must be radiation-hard.Both devices will improve the e.m. hermeticity of the detector in the searchfor new particles. Finely segmented and very compact electromagneticcalorimeters will match these requirements. Due to the high occupancy, fastfront-end electronics will be needed. Monte Carlo studies were performed toinvestigate the impact of beam-beam interactions and physics backgroundprocesses on the luminosity measurement, and of beamstrahlung on theperformance 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 andprototypes are available. Prototypes of sensor planes fully assembled withreadout electronics have been studied in electron beams.

ECFA Detector R&D Panel, Review Report