[en] An iron/gas parallel plate volume calorimeter prototype, working in the avalanche mode, has been tested using electrons of 20 to 150 GeV/c momentum with high voltages varying from 5400 to 5600 V (electric fields ranging from 36 to 37 KV/cm), and a gas mixture of CF₄/CO₂ (80/20%). The collected charge was measured as a function of the high voltage and of the electron energy. The energy resolution was also measured. Comparisons are made with Monte-Carlo predictions. Agreement between data and simulation allows the calculation of the expected performance of a full size calorimeter

[en] Mesooptical Fourier Transform Microscope (MFTM) is a new coherent optical data processing system which gives an optical output signal only if a straight line appears in the input plane and can be used for searching straight lines in a complicated input picture. The principle of operation of the MFTM and its application for searching for tracks of elementary particles in nuclear emulsion are shown. 3 refs.; 3 figs

[en] A prototype module of an iron/gas calorimeter based on parallel plate chambers, has been tested using high energy electrons and pions, at two high voltages, using CF₄/CO₂ (80/20) at atmospheric pressure. The collected charge and energy resolution have been measured as a function of the beam energy for both electrons and pions and compared with Monte Carlo predictions. (orig.)

[en] A new device for high energy physics, the Meso-optical Fourier Transform Microscope (MFTM), designed for observation fo straight line particle tracks in nuclear research emulsion is described. The MFTM works without any mechanical or electronical depth scanning and can be considered as a selectivity viewing 'eye'. The computer controlled system containing MFTM as its main unit is given. This system can be used for a fast search for particle tracks and events produced by high energy neutrinos from particle accelerators. The results of the first experimental test of the computer controlled MFTM are presented. The performance of this system is described and discussed. It is shown that the angular resolution of the MFTM is 1 angular minute and the measurement time is equal to 30 ms per image. As all operations in the MFTM proceed without any depth scanning, this new evaluation system works at least two orders of magnitude faster than any known system with a traditional optical microscope. (orig.)

[en] A drift chamber which measures the drift time of photoelectrons emitted from the cathode surface by means of a UV laser pulse has been built. The chamber is used for monitoring the drift time changes in the muon chambers of the L3 detector at CERN due to changes of gas parameters with the accuracy of 0.1%. The construction and experiments to determine the accuracy and stability of the device are described. (orig.)

[en] The baseline option for the very forward calorimetry in the CMS experiment is an iron/gas calorimeter based on parallel plate chambers. A small prototype module of such a calorimeter, has been tested using electrons of 5 to 100 GeV/c momentum with various high voltages and two gases: CO₂ (100%) and CF₄/CO₂(80/20), at atmospheric pressure. The collected charge has been measured as a function of the high voltage and of the electron energy. The energy resolution has also been measured. Comparisons have been made with Monte-Carlo predictions. Agreement between data an simulation allows to make and estimation of the expected performance of a full size calorimeter. (Author)

[en] A prototype module of an iron-gas sampling calorimeter based on parallel-plate chambers, full-size depth, has been tested using high-energy muons, electrons and pions. The module was equipped with more than 1000 active cells read out individually. Experimental measurements at the test beam and their comparison with Monte-Carlo simulations are presented. Expected performance for a calorimeter suitable for low-angle regions in LHC experiments are derived. (orig.)

[en] We present the performance of a hodoscope made of resistive plate chambers (RPC) installed in the RD5 experiment at CERN and exposed to beams of high energy muons and pions. The efficiency as a function of the particle flux is studied for different resistivities. A substantial improvement is obtained with plates of lower resistivity. Tracking muons through the RPC and using the bending power of a 2.7 T m iron toroid, a simple trigger algorithm is used to select large momentum muons. (orig.)

[en] Results on the radiation resistance test of ceramic parallel-plate chambers after nearly 1 Grad gamma irradiation are presented. (orig.)

[en] An iron/gas parallel plate volume calorimeter prototype, working in the avalanche mode, has been tested using electrons of 20 to 150 GeV/c momentum with high voltages varying from 5400 to 5600 V (electric fields ranging from 36.0 to 37.3 kV/cm), and a gas mixture of CF₄/CO₂ (80%/20%). The collected charge has been measured as a function of the high voltage and of the electron energy. The energy resolution has also been measured. Comparisons have been made with Monte Carlo predictions. Agreement between data and simulation allows the calculation of the expected performance of a full size calorimeter. (orig.)