R&D with very forward detectors at linear colliders

AbstractThe very forward region of the detector at a future linear collider will be instrumented with two sampling calorimeters – BeamCal and LumiCal – for fast beam parameter estimates, precise luminosity measurements, as well as for the improvement of the hermeticity of the detector at small angles. These very forward calorimeters are designed to sustain high radiation doses and deliver precise and valuable data for the machine- and physics-related measurements. Sensor and ASIC prototypes were developed and tested. Here we report on sensor characteristics and test-beam results obtained from a sensor plane assembled with front-end and ADC ASICs