[en] Photodetectors are widely used in particle and nuclear physics research. Since the beginning of the modern era of photoelectric transducers in the late 1930s, many types of devices have been developed and exploited for physics research. New performance requirements arising in physics experiments have often provided very interesting technological drivers for industry. New ideas for photo-detection are rapidly adapted by the physics community to enable more powerful experimental capabilities. This report gives a sampling of new developments in photodetection for physics research in the period since the first conference in this series, Beaune 96. Representative examples of advances in vacuum devices, solid-state devices and gaseous photodetectors are described including, where appropriate, areas where technological improvements are needed or expected

[en] A data acquisition and handling subgroup consisting of approximately 20 members met during the 1981 ISABELLE summer study. Discussions were led by members of the BNL ISABELLE Data Acquisition Group (DAG) with lively participation from outside users. Particularly large contributions were made by representatives of BNL experiments 734, 735, and the MPS, as well as the Fermilab Colliding Detector Facility and the SLAC LASS Facility. In contrast to the 1978 study, the subgroup did not divide its activities into investigations of various individual detectors, but instead attempted to review the current state-of-the-art in the data acquisition, trigger processing, and data handling fields. A series of meetings first reviewed individual pieces of the problem, including status of the Fastbus Project, the Nevis trigger processor, the SLAC 168/E and 3081/E emulators, and efforts within DAG. Additional meetings dealt with the question involving specifying and building complete data acquisition systems. For any given problem, a series of possible solutions was proposed by the members of the subgroup. In general, any given solution had both advantages and disadvantages, and there was never any consensus on which approach was best. However, there was agreement that certain problems could only be handled by systems of a given power or greater. what will be given here is a review of various solutions with associated powers, costs, advantages, and disadvantages

[en] A conceptual design for an integrated central tracking system based on silicon pixel, silicon strip, and scintillating fiber technologies is described. Issues of occupancy and material in the tracking volume are discussed. A technique for providing a powerful realtime first level trigger with sagitta resolution of 0.5 to 1 mm is presented. The design is characterized by very low occupancies, single crossing time resolution, simple binary electronics, and some degree of L = 10³⁴ potential. (author)

[en] A central tracking detector for SSC based on scintillating fibers arranged in azimuthal shells within a strong solenoidal magnetic field offers single crossing time resolution accompanied by minimal occupancy and simple binary readout electronics. These characteristics are exploited in the conceptual design of a first level trigger which performs full 2-dimensional track reconstruction for each crossing with momentum resolution of 0.004 p_t (Gev/c)^-1. Reconstruction is accomplished in a time of order 40 beam crossings, and the algorithm is easily vectorized. When implemented with piplined digital logic, the trigger is deatimeless producing lists of reconstructed tracks for each crossing at the 60 MHz crossing frequency after the pipeline delay. It is suggested that incorporating track segment decoding logic on the same ASIC as the required pipeline delay coupled with a separate, and programmable, segment linker may be an effective realization

[en] Hadronic energy measurements in the central and end cap regions of the Compact Muon Solenoid (CMS) detector will be made using sampling calorimeter techniques with plastic scintillator tiles as the sensitive layers. Plastic fibers doped with wavelength shifting fluors embedded in each tile are used to extract the scintillation light. Clear plastic wave guide fibers carry the shifted light to photodetectors located on the outer surface of the calorimeter structure. Environmental constraints and physics performance requirements for these photodetectors are presented. Candidate photodetector technologies are discussed, and the hybrid photomultiplier tube technology is identified as most promising. (orig.)

[en] A scintillation counter hodoscope with 1 mm granularity using fiber optic light guides was designed for use in a 200-GeV secondary hadron beam. Special care was taken to position the scintillators with high accuracy. The efficiency in a beam of 2.5*10₆ particles/sec is 98%

[en] A scintillation counter hodoscope with 1 mm granularity using fiber optic light guides was designed for use in a 200 GeV secondary hadron beam. Special care was taken to position the scintillators with high accuracy. The efficiency in a beam of 2.5 x 10⁶ particles/s is 98%. (Auth.)

[en] Average multiplicities and pseudorapidity distributions for 100-GeV/c p-, K⁺-, and π⁺-nucleus collisions are presented. The average multiplicities increase with nuclear thickness. The fractional increase is independent of incident particle species, provided that nuclear thicknesses are calculated in units of mean free path of the incident hadron. This scaling behavior suggests that the immediate product of a hadron-nucleon collision is a state similar to the incident hadron

[en] Pseudorapidity distributions for proton-nucleus interactions are presented. The data cover twelve nuclei ranging from carbon to uranium and three incident proton momenta, 50, 100, and 200 GeV/c

No abstract available