The talk title and abstract are: Luminometers for future linear collider experiments The luminosity is a key parameter of a particle collider. Its precise and fast measurement is essential for the physics program. The FCAL collaboration develops the technologies of compact and fast calorimeters  to measure the luminosity both with high precision using small angle Bhabha  scattering, and bunch-by-bunch using beamstrahlung pairs. Beside the luminosity  measurement, the capability of detecting high energy electrons at low angles is  important for many search experiments. For the precision device, called LumiCal,  sensors will be made of Silicon. For the fast device, called BeamCal, several  options of radiation hard and very fast sensors, such as GaAs or single crystal  sapphire, are considered in addition to silicon, all of which are being characterized  in terms of radiation tolerance. A small Moliere radius facilitates the measurement of Bhabha events in the presence  of background and allows the detection of single high energy electrons on top of  the widely spread background of beamstrahlung. Two multi-plane prototypes of a  precision luminometer were studied in beams of electrons and muons with momenta  around 5 GeV at CERN and DESY. The results for the longitudinal and the transverse  shower profiles are compared with Geant4 simulations of the setup and used to determine  the effective Moliere radius of the prototypes. Recently developed ultra-thin detector  planes demonstrate a very small effective Moliere radius approaching the technological limit.    Dedicated multi-channel ultra-low power readout ASIC are under development in 130nm CMOS,  comprising an analogue front-end and fast 10-bit ADC in each channel, followed by fast  serialization and data transmission. Laboratory tests with prototypes confirmed the basic  functionalities and established excellent agreement with simulations. In addition, an ASIC  with a dual readout scheme for BeamCal allowing for a fast feedback to the accelerator and  simultaneous data taking and calibration is under development.    The talk will give a summary of results about design optimisation, beam-tests, sensor  radiation damage studies, and the status of the readout ASICs. Angel Abusleme Associate Professor and Department Chair, Electrical Engineering Pontificia Universidad Católica de Chile +562 2354 4284 Web: http://www.ing.puc.cl/die [www.ing.puc.cl] Twitter: https://twitter.com/UcElectrica [twitter.com]