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The intrinsic time structure of hadronic showers has been studied to evaluateits influence on the timing capability and on the required integration time ofhighly granular hadronic calorimeters in future collider experiments. Theexperiments have been carried with systems of 15 detector cells, using bothscintillator tiles with SiPM readout and RPCs, read out with fast digitizersand deep buffers. These were installed behind the CALICE scintillator -Tungsten and RPC - Tungsten calorimeters as well as behind the CALICEsemi-digital RPC - Steel calorimeter during test beam periods at the CERN SPS.We will discuss the technical aspects of these systems, and present results onthe measurement of the time structure of hadronic showers in steel and tungstencalorimeters. These are compared to GEANT4 simulations, providing importantinformation for the validation and the improvement of the physics models. Inaddition, a comparison of the observed time structure with scintillator and RPCactive elements will be presented, which provides insight into the differencesin sensitivity to certain aspects of hadronic showers depending on readouttechnology.

The Time Structure of Hadronic Showers in Imaging Calorimeters with Scintillator and RPC Readout