M.A. Giorgi

A MULTI-ELECTRODE SILICON DETECTOR FOR HIGH-ENERGY EXPERIMENTS

Abstract A detector has been developed in our laboratory for proposed use in high energy experiments. It works as a MWPC in which the ionizing medium consists of a thin layer of silicon crystal. The results of the test carried out at CERN show that the detector is ideally suited for the detection of minimum ionizing particles and can provide very high spatial resolution.

Electronic measurement of the lifetime of D± mesons

Abstract Charmed meson pairs have been photoproduced coherently on an active silicon target. Ninety-eight decays have been analyzed and the lifetime of charged Ds has been measured.

Construction and performance of a silicon target for the decay-path measurement of long-lived mesons

Abstract A telescope made up of thin silicon detectors was built and used as a live target in a high-energy photoproduction experiment at the CERN Super Proton Synchrotron. Its working principles, construction technique, and the results of tests are reported. This telescope will allow measurement of the decay path in the range 300–10000 μm.

A new fast and programmable trigger logic

Abstract The NAl (FRAMM) experiment, under construction for the CERN-SPS North Area, deals with more than 1000 counter signals which have to be combined together in order to build sophisticated and highly selective triggers. These requirements have led to the development of a low cost, combinatorial, fast electronics which can replace, in an advantageous way, the standard NIM electronics at the trigger level. The essential performances of the basic circuit are: 1. 1) programmability of any desired logical expression; 2. 2) trigger time independent of the chosen expression; 3. 3) reduced cost and compactness due to the use of commercial RAMs, PROMs, and PLAs; 4. 4) short delay, less than 20 ns, between input and output pulses.

HIGH-RESOLUTION SILICON DETECTORS FOR COLLIDING BEAM PHYSICS

Abstract Resolution and linearity of the position measurement of Pisa multi-electrode silicon detectors are presented. The detectors are operated in slightly underdepleted mode and take advantage of their intrinsic resistivity for resistive charge partition between adjacent strips. 22 μm resolution is achieved with readout lines spaced 300 μm. Possible applications in colliding beam experiments for the detection of secondary vertices are discussed.

Germanium microstrip detectors with 50 and 100 μm pitch

Abstract Multi-electrode germanium detectors are being used as an active target for decay path measurements of charmed mesons. The procedure used to fabricate such detectors is described and a brief analysis of their performance is given.

A set of drift chambers built for the FRAMM-NA1 spectrometer

Abstract This paper describes the module of the drift chamber system used at CERN in a multiparticle magnetic spectrometer (FRAMM-NA1). Details are given about a new construction procedure which allows the quick and easy assembly of the chambers. Tests have been performed to check the construction accuracy, the detection efficiency and the final spatial resolutions, the results are reported. agger;

Construction and performance of two multicell Cherenkov counters used in FRAMM-NA1 spectrometer

Abstract Two small dimension multicell Cherenkov counters have been built for FRAMM-NA1 multiparticle spectrometer to identify pions and kaons in the momentum range between 5 and 22 GeV/c. The performances achieved and the construction details are reported.