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Title: The DISTO data acquisition system at SATURNE

Abstract

The DISTO collaboration has built a large-acceptance magnetic spectrometer designed to provide broad kinematic coverage of multiparticle final states produced in pp scattering. The spectrometer has been installed in the polarized proton beam of the Saturne accelerator in Saclay to study polarization observables in the {rvec p}p {yields} pK{sup +}{rvec Y} (Y = {Lambda}, {Sigma}{sup 0} or Y{sup *}) reaction and vector meson production ({psi}, {omega} and {rho}) in pp collisions. The data acquisition system is based on a VME 68030 CPU running the OS/9 operating system, housed in a single VME crate together with the CAMAC interface, the triple port ECL memories, and four RISC R3000 CPU. The digitization of signals from the detectors is made by PCOS III and FERA front-end electronics. Data of several events belonging to a single Saturne extraction are stored in VME triple-port ECL memories using a hardwired fast sequencer. The buffer, optionally filtered by the RISC R3000 CPU, is recorded on a DLT cassette by DAQ CPU using the on-board SCSI interface during the acceleration cycle. Two UNIX workstations are connected to the VME CPUs through a fast parallel bus and the Local Area Network. They analyze a subset of events for on-linemore » monitoring. The data acquisition system is able to read and record 3,500 ev/burst in the present configuration with a dead time of 15%.« less

Authors:
 [1];  [2];  [3]
  1. Dipt. di Fisica A. Avogadro, Torino (Italy)|[INFN, Torino (Italy)
  2. LNS-CEN Saclay, Gif-sur-Yvette (France)
  3. LNS-CEN Saclay, Gif-sur-Yvette (France)|[Dipt. di Fisica A. Avogadro, Torino (Italy)|[INFN, Torino (Italy) [and others
Publication Date:
OSTI Identifier:
624233
Report Number(s):
CONF-971147-
Journal ID: IETNAE; ISSN 0018-9499; TRN: 98:006486
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Nuclear Science; Journal Volume: 45; Journal Issue: 3Pt1; Conference: Institute of Electrical and Electronic Engineers (IEEE) nuclear science symposium and medical imaging conference, Albuquerque, NM (United States), 11-13 Nov 1997; Other Information: PBD: Jun 1998
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 43 PARTICLE ACCELERATORS; SATURNE; MAGNETIC SPECTROMETERS; DATA ACQUISITION SYSTEMS; FINAL-STATE INTERACTIONS; DESIGN; DIGITIZERS; PROTON-PROTON INTERACTIONS

Citation Formats

Balestra, F., Bedfer, Y., and Bertini, R.. The DISTO data acquisition system at SATURNE. United States: N. p., 1998. Web. doi:10.1109/23.682653.
Balestra, F., Bedfer, Y., & Bertini, R.. The DISTO data acquisition system at SATURNE. United States. doi:10.1109/23.682653.
Balestra, F., Bedfer, Y., and Bertini, R.. 1998. "The DISTO data acquisition system at SATURNE". United States. doi:10.1109/23.682653.
@article{osti_624233,
title = {The DISTO data acquisition system at SATURNE},
author = {Balestra, F. and Bedfer, Y. and Bertini, R.},
abstractNote = {The DISTO collaboration has built a large-acceptance magnetic spectrometer designed to provide broad kinematic coverage of multiparticle final states produced in pp scattering. The spectrometer has been installed in the polarized proton beam of the Saturne accelerator in Saclay to study polarization observables in the {rvec p}p {yields} pK{sup +}{rvec Y} (Y = {Lambda}, {Sigma}{sup 0} or Y{sup *}) reaction and vector meson production ({psi}, {omega} and {rho}) in pp collisions. The data acquisition system is based on a VME 68030 CPU running the OS/9 operating system, housed in a single VME crate together with the CAMAC interface, the triple port ECL memories, and four RISC R3000 CPU. The digitization of signals from the detectors is made by PCOS III and FERA front-end electronics. Data of several events belonging to a single Saturne extraction are stored in VME triple-port ECL memories using a hardwired fast sequencer. The buffer, optionally filtered by the RISC R3000 CPU, is recorded on a DLT cassette by DAQ CPU using the on-board SCSI interface during the acceleration cycle. Two UNIX workstations are connected to the VME CPUs through a fast parallel bus and the Local Area Network. They analyze a subset of events for on-line monitoring. The data acquisition system is able to read and record 3,500 ev/burst in the present configuration with a dead time of 15%.},
doi = {10.1109/23.682653},
journal = {IEEE Transactions on Nuclear Science},
number = 3Pt1,
volume = 45,
place = {United States},
year = 1998,
month = 6
}
  • The nuclear physics group at the University of Illinois has implemented a data acquisition system using modified versions of the Concurrent Pascal and Sequential Pascal languages. The user, a physicist, develops a data acquisition ''operating system'', written in these higher level languages, which is tailored to the planned experiment. The user must include only those system functions which are essential to the task, thus improving efficiency. The user program is constructed from simple modules, mainly consisting of Concurrent Pascal PROCESSes, MONITORs, and CLASSes together with appropriate data type definitions. Entire programs can be put together using ''cut and paste'' techniques.more » Planned enhancements include the automating of this process. Systems written for the Perkin-Elmer 3220 using this approach can easily exceed 2 kHz data rates for event by event handling; 20 kHz data rates have been achieved by the addition of buffers in the interrupt handling software. These rates have been achieved without the use of special-purpose hardware such as micro-programmed branch drivers. With the addition of such devices even higher data rates should be possible.« less
  • The general principles governing the control and monitoring of the Saturne are discussed. The principal control room, the auxiliary control room, and the radiation control room are described. The characteristics of the power supply system, pumping equipment, cooling, electromagnets, high-frequency system, and general circuits are briefly considered. (J.S.R.)
  • The problems in the design and construction of an acceleration system for a proton synchrotron are reviewed. The Saturne acceleration system is based on a step process, and it is divided into a low- and a highlevel acceleration sthge. The frequency of the low-level stage is obtained with a master oscillator. The design of the high-level stage is based on an attempt to reduce the seale of the installation. Therefore, an acceleration structure of the eleetromagnetic cavity type charged with ferrites was adopted. (J.S.R.)
  • The timing circuits of the Saturne are divided into three categories: the controls relative to the magnet power supply, the triggering mechanisms, and the controls governing the cycle periods. The magnet timing and the triggering circuits are briefly discussed, but the controls governing the cycle periods are described in some detail. The principle of operation of these controls are considered. (J.S.R.)
  • The high-frequency amplifier designed for the Saturne proton synchrotron is capable of furnishing 6 kw power (at peak voltage of 3000 v). The functional diagram of the amplifier is given and divided into three parts: the coupling components, preamplifiers, and power amplifiers. Each part is described in detail. (J.S.R.)