Speaker
Dr
Frank Simon
(Max-Planck-Institute for Physics, Munich, Germany)
Description
For calorimeter applications requiring precise time stamping, the time structure of hadronic showers in the detector is a crucial issue. This applies in particular to detector concepts for CLIC, where a hadronic calorimeter with tungsten absorbers is being considered to achieve a high level of shower containment while satisfying strict space constraints. The high hadronic background from gamma gamma to hadron processes at CLIC, together with the bunch crossing frequency of 2 GHz requires good time stamping in the detectors. To provide first measurements of the time structure in a highly granular scintillator-tungsten calorimeter, T3B, a dedicated timing experiment, was installed behind the last layer of the CALICE WHCAL prototype, a 30 layer tungsten scintillator calorimeter. T3B consists of 15 small scintillator cells with silicon photomultiplier, read out with fast digitizers over 2.4 us, and provides detailed measurements of the time structure of the signal. The offline data reconstruction performs an automatic gain calibration using noise events recorded between physics triggers and allows the determination of the arrival time of each photon at the photon sensor.
We will discuss the T3B setup, its calibration and data reconstruction, and will report first results of the time structure of the calorimeter response for 10 GeV pions recorded at the CERN PS, confronted with GEANT4 simulations using several physics lists.
Authors
Christian Soldner
(Max-Planck-Institute for Physics, Munich, Germany)
Dr
Frank Simon
(Max-Planck-Institute for Physics, Munich, Germany)
Lars Weuste
(Max-Planck-Institute for Physics, Munich, Germany)
