A. Vogel

MarlinTPC: A common software framework for TPC development

MarlinTPC is a simulation, digitisation, reconstruction and analysis package for research and development on Time Projection Chambers. It is based on the modular Marlin framework for ILC detector development and on the LCIO event data model. The MarlinTPC package consists of more than 50 software modules, providing a flexible tool box for a large variety of TPC applications. It is designed to simulate and reconstruct data from TPCs equipped with conventional pad readout and different kinds of electronics (ADCs and TDCs), taking into account the particularities of micro pattern gas amplification (GEMs and Micromegas). Also upcoming pixellated readouts as the Timepix chip are supported.

R&D work for a GEM-based high resolution TPC for the ILC

We report on R&D work for a time projection chamber (TPC) at the International Linear Collider (ILC). A high resolution TPC with gas amplification based on micropattern gas detectors is one of the options for the main tracking system at the ILC detector. The physics to be studied and the environment at the ILC pose new challenges to the performance of all detector components. For instance the momentum resolution of the tracker should be improved by an order of magnitude with respect to LEP detectors. Significant progress towards this goal has been achieved recently and we report here on results of our groups which are studying a TPC concept with triple gas electron multiplier (GEM) structures for gas amplification. The required spatial resolution of 100 /spl mu/m has been achieved in measurements with a prototype TPC in high magnetic fields. The problem of ion backdrift has been studied and found to be significantly reduced in such GEM structures. In addition, a low mass TPC field cage has been designed and constructed demonstrating a way to minimise the total radiation length of the ILC tracker. A detailed simulation for a TPC has been developed. Simulations concerning the background at the ILC are ongoing.