[en] A high momentum particle identification detector (HMPID) covering about 5% of the ALICE central barrel region has been designed and prototyped. The detector consists of seven RICH modules with a proximity focusing geometry, covering 12 m². The very large density of hits on the detector (80-90 part/m² in the extreme cases) makes the recognition of the Cherenkov photon patterns a complex and crucial task. A study of the pattern recognition strategy based on the Hough transformation in terms of particle identification efficiency and particle contamination will be presented

[en] We report on the final tests performed on a CsI-based RICH detector equipped with 2 C₆F₁₄ radiator trays and 4 photocathodes, each of 64x38 cm² area. The overall performance of the detector is described, using different gas mixtures, in view of optimizing the photoelectron yield and the pad occupancy. Test results under magnetic field up to 0.9 T, photocathode homogeneity and stability are presented

[en] We report on the design and construction of a CsI-RICH detector composed of four CsI photocathodes of 64x40 cm² each, and two C₆F₁₄ radiator trays of 133x41 cm². A detailed description of the novel elements is given and the performance of the detector is illustrated with some basic results obtained during the tests at the beam

[en] This paper reports on the DELPHI detector, installed at LEP, equipped with RICH (Ring Imaging Cherenkov) counters. The Barrel part incorporates a liquid (C₆F₁₄ and a gaseous (C₅F₁₂) radiator providing particle identification up to 20GeV/C. The Cherenkov photons of both radiators are detected by TPC like photon detectors. The drift gas (75% CH₄ + 25 %C₂H₆) is doped with TMAE, by which the UV Cherenkov photons are converted into single free photo electrons. These photo electrons are drifted towards MWPC's at the end of the drift tubes and the space coordinates of the conversion point are determined. One half of the Barrel RICH is now equipped with drift tubes and produces results from the liquid radiator since spring 1990. The gas radiator has been tested with C₂F₆ as a preliminary filling since August 1990. The data obtained demonstrate the good particle identification potential. For the liquid radiator the number of detected photons per ring in hadron jets is N=8 whereas for muon pairs (single tracks) N-10 electrons have been observed. For the gas radiator 2.1 electrons per track were observed, which demonstrates the good functioning of the focussing mirrors, as for C₂F₆ this is close to the expected value

[en] A short explanation is given of the Barrel Ring Imaging CHerenkov (BRICH) detector and its performance. We discuss in brief some of the requirements to run this detector. Special attention is paid to the functioning of the Cherenkov photon detector - a photosensitive gas-filled drift chamber where the photoelectrons drift to a MWPC of special construction. We illustrate the BRICH performance with some preliminary results. (orig.)

[en] Recent results from test measurements with cosmic rays of jet-cell chamber prototypes, developed and studied for the μ detector of the ATLAS apparatus, are reported. (orig.)

[en] Large-area, high-precision drift chambers, based on the ''jet cell'' concept, have been developed for the muon spectrometer of the ATLAS experiment at LHC. Emphasis is placed on the control and reduction of systematic error in the drift measurement and in the mechanical construction. Results of measurements on prototypes are given. These indicate that a global precision of σ< or∼70 μm is achievable for large-area chambers. (orig.)