Calorimeters with silicon detectors have many unique features and are proposed for several world-leading experiments. We discuss the tests of the first three 18x18 cm$^2$ layers segmented into 1024 pixels of the technological prototype of the silicon-tungsten electromagnetic calorimeter for a future $e^+e^-$ collider. The tests have beem performed in November 2015 at CERN SPS beam line.
Comment: Proceedings for "Instrumentation for Colliding Beam Physics" (INSTR17) conference, 27 February - 3 March 2017, Novosibirsk, Russia