A high-resolution detector based on liquid-core scintillating fibres with readout via an electron-bombarded charge-coupled device

This paper is a presentation of results from tests in a 5 GeV/c hadron beam of detectors based on liquid-core scintillating fibres, each fibre consisting of a glass capillary filled with organic liquid scintillator. Fibre readout was performed via an Electron-Bombarded Charge-Coupled Device (EBCCD) image tube, a novel instrument that combines the functions of a high-gain, gated image intensifier and a Charge-Coupled Device. Using 1-methylnaphthalene doped with 3 g/l of R45 as liquid scintillator, the attenuation lengths obtained for light propagation over distances greater than 16 cm were 1.5 m in fibres of 20 mu m core and 1.0 m in fibres of 16 mu m core. For particles that crossed the fibres of 20 mu m core at distances of similar to 1.8 cm and similar to 95 cm from the fibres' readout ends, the recorded hit densities were 5.3 mm(-1) and 2.5 mm(-1) respectively. Using 1-methylnaphthalene doped with 3.6 g/l of R39 as liquid scintillator and fibres of 75 mu m core, the hit density obtained for particles that crossed the fibres at a distance of similar to 1.8 cm from their readout ends was 8.5 mm(-1). With a specially designed bundle of tapered fibres, having core diameters that smoothly increase from 16 mu m to 75 mu m, a spatial precision of 6 mu m was measured

A highly segmented and compact liquid argon calorimeter for the LHC: the TGT calorimeter

The development of a fast, highly granular and compact electromagnetic liquid argon calorimeter is proposed as an R&D project for an LHC calorimeter with full rapidity coverage. The proposed ``Thin Gap Turbine'' (TGT) calorimeter offers uniform energy response and constant energy resolution independent of the production angle of the impinging particle and of its impact position at the calorimeter. An important aspect of the project is the development of electronics for fast signal processing matched to the short charge collection time in the TGT read-out cell. The system aspects of the integration of a high degree of signal processing into the liquid argon would be investigated