The DISTO Data Acquisition System at SATURNE
نویسنده
چکیده
The DISTO collaboration has built a large-acceptance magnetic spectrometer designed to provide broad kinematic coverage of multi-particle 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 ~ pp → pK~ Y (Y = Λ,Σ or Y ) reaction and vector meson production (φ, ω and ρ) 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 3500 ev/burst in the present configuration with a dead time of 15%.
منابع مشابه
The DISTO First Level Trigger at SATURNE
The DISTO collaboration has built a large-acceptance magnetic spectrometer designed to provide broad kinematic coverage of multi-particle 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 ~ pp → pK~ Y (Y = Λ,Σ or Y ) reaction and vector meson production (φ, ω and ...
متن کاملHyperon Polarization and Vector Meson Production at 2.85 Gev (preliminary Results)
On Behalf of the DISTO Collaboration * Surprisingly large polarization in hyperon production by unpolarized proton beam has been known since long time. Huge inclusive hyperon polarization data are available in literature, few data are disponible on spin observables and none on exclusive hyperon measurements. Evidence of relevant violation of the OZI rule in several reactions are also shown in r...
متن کاملFormation of the S = − 1 resonance X ( 2265 ) in the reaction pp → X + K + at 2 . 50 and 2 . 85 GeV June 7 , 2012
Analyzing DISTO data of pp → pΛK at Tp = 2.50 and 2.85 GeV to populate a previously reported X(2265) resonance with MX = 2267 MeV/c 2 and ΓX = 118 MeV at 2.85 GeV, we found that the production of X(2265) at 2.50 GeV is much less than that at 2.85 GeV (less than 10%), though it is expected from a kinematical consideration to be produced as much as 33% of that at 2.85 GeV. The small population of...
متن کاملCompensation of Doppler Effect in Direct Acquisition of Global Positioning System using Segmented Zero Padding
Because of the very high chip rate of global positioning system (GPS), P-code acquisition at GPS receiver will be challenging. A variety of methods for increasing the probability of detection and reducing the average time of acquisition have been provided, among which the method of Zero Padding (ZP) is the most essential and the most widely used. The method using the Fast Fourier Transform (FFT...
متن کامل