[en] The UA1 experiment for investigations on proton-antiproton interactions has a detection unit comprising a cylindrical drift chamber, an electromagnetic calorimeter, a hadronic calorimeter and additional drift chambers for the muon detection. Especially with the em calorimeter the interference from nearby power circuits exceeded the specified level. The task for the author was to reduce the interference to an acceptable level without major infringement into the existing electronics. The causes and propagation paths of interferences were found out and simulated in the laboratory. An improvement strategy was derived consisting mainly in changes of the grounding configuration, the periferies of the electronics proper, and only to a small degree on the experiment electronics itself. The author developed a new current supply system featuring the same modularity as the detector itself enabling a nearly complete guard-shield configuration for the 12 channels of the same cable. The signal-to-noise ratio could be improved by 40 in the most afflicted channels. 44 refs., 32 figs., 5 tabs. (qui)

[en] The development of a low cost fast charge integrating and shaping circuit (FCISC) was motivated by the need for an interface between the photomultipliers of an existing hadronic calorimeter and recently developed new readout electronics designed to match the output of small ionization chambers for the upgraded UA1 detector at the CERN proton-antiproton collider. This paper describes the design principles of gated and ungated charge integrating and shaping circuits. An FCISC prototype using discrete components was made and its properties were determined with a computerized test setup. Finally an SMD implementation of the FCISC is presented and the performance is reported. (orig.)

[en] The paper gives hints on how to properly supply power to high-energy physics detectors. It later focusses on some electromagnetic compatibility issues because it is widely accepted that the power supply system is a crucial parameter in the system design of detector electronics. In some cases the power supply system remains the only variable in a given setup which again stresses its importance in particular during the design phase of an experiment. (orig.)

[en] A solution of interfacing a scintillator calorimeter with photomultipliers to electronics designed for ionization chambers is presented. We describe in detail the development guidelines and the layout of a combined analogue/digital card that allows us to form a coherent electronics setup with the same readout chain for two entirely different types of calorimeters. (orig.)

[en] A steadily rising luminosity and different readout architectures for the various detector systems of UA1 required a new data flow control to minimize the dead time. BATS, a finite state machine conceived around two microprocessors in a single VME crate, improved flexibility and reliability. Compatibility with BATS streamlined all readout branches. BATS also proved to be a valuable asset in spotting readout problems and previously undetected data flow bottlenecks. (orig.)

No abstract available

No abstract available

[en] We describe the construction, calibration and performance of the central electromagnetic calorimeter of the UA1 experiment at the CERN proton-antiproton collider. The calorimeter is of the lead-scintillator sandwich type. It is 26.4 radiation lengths thick and covers a surface of about 50 m². We estimate the resolution of the calorimeter for electrons of energy greater than 1 GeV to be the sum in quadrature of 15%/√E (E in GeV) and a constant 3%. The first term comes from the inherent resolution of the calorimeter due to sampling fluctuations and photostatistics. The second term comes from uncertainties in the calibration procedure and dominates the resolution for electrons from W and Z⁰ decay. The uncertainty in the overall energy scale also reflects the uncertainties in the calibration procedure and is estimated to be 3%. (orig.)

[en] We have developed a method for reading out scintillator plates in a compact calorimeter using embedded wavelength-shifting fibres coupled to photomultipliers. A test calorimeter using this technique, with uranium plates as the passive medium, was placed in test beams of 1 to 80 GeV. Results on resolution, uniformity, and electron-pion discrimination are presented, as well as a discussion of compensation (the near-equality of electron and hadron responses). (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.)