EDMS No. 456393 TECHNICAL NOTE CERN-SC-2004-23-RP-TN SIMULATION AND EXPERIMENTAL VERIFICATION OF THE RESPONSE FUNCTIONS OF CENTRONIC HIGH-PRESSURE IONISATION CHAMBERS Christian Theis, Markus Rettig, Stefan Roesler and Helmut Vincke Abstract In the course of designing a radiation monitoring system for the LHC it is necessary to study the response functions of different monitoring devices thoroughly in order to identify suitable candidates. Among the systems currently investigated are IG5 ionisation chambers by Centronic Ltd. Generally, Monte Carlo simulations are a suitable tool to investigate the response to specific particle types over a wide energy range and also to mixed radiation fields. This note describes the simulations performed using the FLUKA particle transport code to calculate response functions for argon- and hydrogen-filled IG5 chambers with respect to various particle types at different energies. The results obtained for photons and neutrons are also compared to measurements that were performed to validate the simulation model. CERN, Geneva, Switzerland 30.06.2004 ORGANISATION EUROPEENNE POUR LA RECHERCHE NUCLEAIRE EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH Laboratoire Européen pour la Physique des Particules European Laboratory for Particle Physics