Recent progress with very forward calorimeters for linear colliders
O. Borysov, on behalf of the FCAL Collaboration
Recent developments for very compact calorimeters designed for precise luminosity measurement (LumiCal) and beam monitoring (BeamCal) in the very-forward region of future linear colliders are presented. Silicon pad sensors for LumiCal have been equipped with modern read-out electronics and tested in the laboratory. Ultra-compact assemblies of these sensors, with only 1 mm spacing between tungsten absorber plates, have been developed. This stack has been exposed to few-GeV electron and muon test beams at CERN and DESY. First results on shower development in such a compact stack are presented and compared to Geant4 simulations.