In Situ Calibration of Prototype Modules

Abstract

The principal result of the qualification studies in the previous chapter is that the HGCAL prototype modules provide reconstructable electronic signals for the measurement of deposited energies in the calorimeter cells. However, the conversion of such signals into a physical energy scale relies on prior calibration of the cells’ energy responses as well as calibration of the gains involved in the readout. Referring to the energy derivation recipes formulated by Eqs. 7.8, 7.9 and 7.10 in Sect. 7.2.4, an equivalent statement is that all calibration constants for as many readout channels as possible remain to be derived. This task is discussed in this chapter. Here, the calibrations are not obtained from dedicated calibration experiments, e.g. from charge injection in the laboratory, but in situ from the beam test data directly using minimum ionising and showering particles.