[en] The improvement of loss theory in superconducting magnets requires measurements during very short cycles. Immediate computation and storage of results and graphic display possibilities are needed. A high rate multichannel acquisition system has been developed for this purpose, built-in to a low cost microcomputer based on the S.100 bus. The multichannel acquisition system is divided into two boards: an analog board which contains one to four fast A D C (one per channel) and a digital board, containing the memory which is directly accessible through the processor. It is fully programmable: one to four channels, 8 K bytes in selected configuration, logging speed up to 4 μs and measurement number. Losses during a 1 ms cycle can be measured with good accuracy. Because of its flexibility, this system can be used to study other transient phenomena such as quenches or stability measurements. 2 refs

[en] A modular control system has been developped for the automatization of cryogenic systems. The hardware has been built around a microprocessor; conventional and specific modules for cryogenic applications have been developped. A special software has also been written, the first aim of which being an easy writing and modifying of the process control by the users. The prototype of this system has been operated for more than a year. The system is now commercially available; it has been used and is under consideration for several cryogenic projects in which the laboratory is involved

[en] Within the framework of a contractual collaboration with IHEP (Institute for High Energy Physics, Protvino) for the UNK project, two test stands have been built and delivered to measure the magnetic characteristics of the UNK superconducting quadrupoles: location and transfer of the magnetic axis, gradient value and homogeneity. This paper describes the different parts of the apparatus, in particular the carbon fiber measuring tube which enables the sag of the measuring device to be minimized. Emphasis is put on the mechanical measurements and controls made on the measuring tube, the wire system used to locate the magnetic axis and the optical elements selected for the alignment. Preliminary results obtained in the USSR are reported

No abstract available

[en] In a close collaboration between physicists and engineers from IHEP and CEN Saclay, a system for quench detection on a UNK superconducting string (from 4 to 100 magnets) has been designed and is now under construction at Saclay; this system also enables the data analysis in normal conditions or in case of a quench. The paper describes the architectural design of the system, the hardware (microprocessors are used for the whole system) and the software. Emphasis will be put on the main problems of construction friability, quench detection at a low level and in a very short time, high voltages, data transmission on long distances and integration in the general system of the accelerator

[en] As part of the magnet R and D program for the Large Hadron Collider (LHC), CEA Saclay has designed and built two 3 meters long, 56 mm twin aperture arc quadrupole magnet prototypes. Extensive harmonic field measurements were performed during the cold test of the second prototype, using a newly developed magnetic measurement system. After a brief description of the new system, a review of the field quality data as a function of axial position, current and ramp rate is presented. (authors). 9 refs., 2 figs., 1 tab

[en] A new kind of compton polarimeter using a resonant Fabry-Perot cavity as a power buildup for the photon beam is proposed. A prototype of such a cavity is described, along with the results obtained in terms of source to be used in a compton scattering polarimeter. (orig.)

[en] This report describes the design of the Compton polarimeter for the Cebaf electron beam in End Station A. The method of Compton polarimeter is first introduced. It is shown that at CEBAF beam intensities, the use of standard visible LASER light gives too low counting rates. An amplification scheme of the LASER beam based on a high finesse optical cavity is proposed. Expected luminosities with and without such a cavity are given. The polarimeter setup, including a 4 dipole magnet chicane, a photon and an electron detector, is detailed. The various sources of systematic error on the electron beam polarization measurement are discussed. (author)