[en] The design, construction and operation of a high resolution microstrip vertex detector used in the Fermilab experiment E687 is discussed and the performances in detection, track and event reconstruction are presented. (orig.)

[en] This paper presents a system to tag the particle momentum of the wide band primary electrons and positrons beam (PB EAST of FNAL). It consists of five large area microstrip detectors, assembled in a symmetric two lever arm configuration, measuring the particle bend angles across the last pair of beam dipoles. Each silicon plane, 300 μm thickness, consists of 256 microstrips with 300 μm pitch and it is exposed to a rate of about 10⁷ particles per sec. The system is capable to work at the TEVATRON radiofrequency (53 MHz). The readout electronics consists of a fast preamplifier/amplifier, a discriminator and a fast ecl memory. The system is currently used in the heavy quarks photoproduction experiment E687 at Fermilab. Technical construction details, performances of the system (efficiencies, momentum resolution and rates capabilities) are presented

[en] A system to measure the particle momentum of the very high intensity wide band electrons and positrons beam (PB EAST of FNAL) has been realized. It consists of five large area silicon microstrip detectors, assembled in a symmetric two lever arm configuration, measuring the particle bend angles across the last pair of beam dipoles. Each silicon plane, 300 μm thickness, consists of 256 microstrips with 300 μm pitch and it is exposed to a rate of about 10⁶ particles cm^-2 s^-1. Nowadays no other kind of detector could operate in such a high intensity beam with such a fine granularity requirement. The system is based on local data pipelining at the TEVATRON radiofrequency (53 MHz) and it is currently used in the heavy quarks photoproduction experiment E687 at FERMILAB, with a 2.2% resolution at 350 GeV. Technical construction details, performances of the system (efficiencies, momentum resolution and rate capabilities) are presented. (orig.)

[en] The magnetic spectrometer and charged particle tracking system used in Fermilab experiment 687 to study the photoproduction and decay of charm particles are described in detail. The photons are produced by a wideband electron beam which can operate at energies up to 600 GeV/c. The spectrometer consists of a high resolution silicon microstrip detector, a large aperture dipole magnet, proportional chambers, a second large aperture dipole, and more proportional chambers. Three multi-cel threshold Cherenkov counters provide charged particle identification. The tracking system is capable of resolving the secondary decay vertices of charm and beauty mesons and baryons from the primary interaction vertex. It also determines the invariant mass of the multibody final states of particles containing heavy quarks with excellent resolution. The particle identification system allows one to identify kaons and protons present in these final states clearly. This collection of detectors produces very clean signals for charm particles and permits one to make many cross checks of the apparatus. The performance is illlustrated for a variety of charm signals. Of particular interest is a description of the tracking through the silicon microstrip detector and its use in isolating downstream decay vertices. Two complementary approaches to the reconstruction of secondary decay vertices are presented and insight is gained by comparing their strengths and weaknesses. (orig.)