H. Brettel

Study of a novel electromagnetic liquid argon calorimeter — the TGT

Abstract The concept and the basic design of a fast, highly granular and compact electromagnetic liquid argon calorimeter are described. This novel calorimeter offers uniform energy response and constant energy resolution independent of the production angle of an impinging particle and of its impact position at the calorimeter. An example of a calorimeter with full rapidity coverage in an application in a collider detector is given. An important aspect of the concept is the electronics for fast signal processing matched to the short charge collection time. We report on the experience with the realization of a prototype calorimeter module and on its performance in a testbeam exposure.

Cold electronics for the liquid argon hadronic endcap calorimeter of ATLAS

This paper describes the on-detector electronics of the ATLAS hadronic end-cap calorimeter (HEC). The electronics is working in liquid argon; therefore the attention is paid to its performance at low temperatures. The calibration and signal cables have been studied in laboratory conditions and signal distortion is modeled. The core of the electronics are GaAs preamplifiers. We present the design, layout and measured characteristics of preamplifier chips and summing boards. The on-module signal distribution is also described. All parts of the electronics have been produced, tested and assembled on the calorimeter modules. The summary of commissioning tests is presented.

Performance of the TGT liquid argon calorimeter and trigger system

Abstract A novel concept of a liquid argon calorimeter, the “Thin Gap Turbine” (TGT) calorimeter, is presented. A TGT test module, equipped with specially developed cold front-end electronics in radiation hard GaAs technology, has been operated in a particle beam. Results on its performance are given. A 40 MHz FADC system with a “circular data store” and standalone readout and play-back capability has been developed to test the properties of the TGT detector for trigger purposes. Results on trigger efficiency, response and energy resolution are given.

A low light level video system for data acquisition from optical particle detectors

Abstract A video system for digitization and registration of particle tracks in the large (2 m×1.2 m) streamer chamber of the NA5 experiment at the CERN SPS is described. Approximately 250 000 events in three stereoscopic views were scanned, digitized and then recorded on magnetic tape. A sample of these events was compared with measurements from film. The two-track resolution and the precision proved to be comparable with the film data.