[en] The present status of the experiment NA11/NA32 is discussed. For 1982 final numbers for the D lifetimes are presented. A partial analysis of the 1984 data has yielded F candidates for a lifetime measurement. 6 refs.

[en] In this lecture an overview is given of the present technology for high field accelerator magnets. We indicate how to get high fields and what are the most important parameters. The available conductors and their limitations are presented followed by the most relevant types of coils and support structures. We conclude by showing a number of recent examples of development magnets which are either pure R&D objects or models for the LHC luminosity upgrade

[en] A system of large planar proportional chambers has been built in the Mechanical Workshop of NIKHEF-H, Amsterdam. The chambers were used to provide coordinate data for on-line track reconstruction using the FAMP system in the NA11 experiment at CERN. The system was first used as an effective mass trigger for a high statistics inclusive phi experiment. In this report, the design, construction and performance of the chambers, with its associated read-out system is described. (Auth.)

[en] The first stage of the programme to increase the luminosity of LEP by colliding more than 4 bunches per beam was implemented during 1991. Electrostatic separators were installed to create 'pretzel orbits' in two quadrants of the ring, a new optics was implemented, new operational procedures were established, and numerous experimental studies of beam behaviour and differential optical effects on pretzel orbits were carried out. The results of this experimental programme settle many beam-dynamics questions relating to the feasibility of the scheme and the prospects for a future High Luminosity LEP can be considerably clarified. (author) 7 refs.; 5 figs

[en] In the experiment NA11 at the CERN SPS the MC68000 based FAMP system has been successfully implemented in a second stage trigger. It was used in a study of inclusive phi-meson production to select phi → K⁺K^- decays by determining the charged K-meson trajectories and calculating the K⁺K^- invariant mass. A trigger rate reduction by a factor of 25 and an increase in the number of recorded phi-decays per unit time by a factor of 8 has been achieved. (Auth.)

No abstract available

[en] Secondary Emission Monitors (SEMs) are used at the SPS for measurements of the absolute proton beam intensity. As an accurate measurement was recently required by the NA56 (SPY) experiment, the responses of all the SEMs used in the SPS North Area, including those used for NA56, were calibrated. The independent measurement of the absolute proton intensity needed for this calibration was obtained by an activation method, where the radioactivity induced in a thin aluminium foil is measured with a gamma counter immediately after a short exposure of the foil to the proton beam. The foil activity was in turn calibrated using the absolute proton intensity measurements provided by the Beam Current Transformers (BCTs) available in the West Area Neutrino Facility. A description of the experimental method and results of the calibration are given. SEM calibration factors were determined with an error that, even in the worst case, does not exceed 3%. The response per unit proton intensity of the new titanium SEMs installed in 1995 is about 9% smaller than that of the traditional aluminium SEMs. The measured calibration factor of the titanium monitor used by NA56 has been shown to be stable within ±1% over a period of almost one month. By combining this additional uncertainty to the error on the determination of the calibration factor from the activation measurement, the absolute proton intensity delivered to NA56 could be measured with an uncertainty of 1.7%. (orig.)

[en] Future particle accelerators will require high field superconducting magnets with a high resistivity against intensive radiation expected in magnet structure. One of the goals of European Coordination for Accelerator Research and Development (EuCARD) 7 FP project is a design of high field Nb₃Sn prototype magnet. Electrical insulation of the magnet coil cables must be characterized by very high resistivity to the radiation, expected during the magnet operation. Paper presents the qualification procedure of potential candidates for the insulators. The insulation samples will be irradiated with the 4 MeV electron beam to a total dose of 50 MGy. The irradiation will be performed in a dedicated cryostat where the samples will be cooled with liquid nitrogen. The irradiated samples will be subjected to mechanical, thermal and electrical tests. The paper presents the methodology of the insulation samples irradiation and acceptance tests. The analysis of optimum irradiated area geometrical patterns has been performed. (author)

[en] Future accelerators will make extensive use of superconductors made of Nb₃Sn, which allows higher magnetic fields than NbTi. However, the wind-and-react technology of Nb₃Sn superconducting magnet production makes polyimide Kapton® non applicable for the coils' electrical insulation. A Nb₃Sn technology compatible insulation material should be characterized by high radiation resistivity, good thermal conductivity, and excellent mechanical properties. Candidate materials for the electrical insulation of future accelerator's magnet coils have to be radiation certified with respect to potential degradation of their electrical, thermal, and mechanical properties. This contribution presents procedures and results of tests of the electrical and mechanical properties of DGEBA epoxy + D400 hardener, which is one of the candidates for the electrical insulation of future magnets. Two test sample types have been used to determine the material degradation due to irradiation: a untreated one (unirradiated) and irradiated at 77 K with 11 kGy/min intense, 4MeV energy electrons beam to a total dose of 50 MGy

[en] In the experiment NA11 at the CERN SPS the MC68000 based FAMP system has been successfully implemented in a second stage trigger. It was used in a study of inclusive phi-meson production to select phi->K⁺K^- decays by determining the charged K-meson trajectories and calculating the K⁺K^- invariant mass. A trigger rate reduction by a factor of 25 and an increase in the number of recorded phi-decays per unit time by a factor of 8 has been achieved. (orig.)