TRIDENT: A track and vertex identification program for the CERN omega particle detector system

Lassalle, J. C.; Carena, F.; Pensotti, S.

doi:10.1016/0029-554x(80)90730-2

Cited by 54 publications

(9 citation statements)

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“…Various applications have been ported to the PPCS, including TRIDENT [29] and magnetohydrodynamics [30]. Several of the CERN applications that use bulk data transfer extensively have shown speedup factors of about 30 with 32 sateUite processors.…”

Section: Resultsmentioning

confidence: 99%

“…CERN has analyzed several of its typical farm applications (e.g., TRIDENT [29] and a Monte Carlo proton-antiproton event generator, ISAJET) on both of these systems and found them to have essentially identical performance characteristics. Both the PPCS and the VMEbus system obtain speedups that approximate the number of processors in the farm.…”

Section: Performancementioning

confidence: 98%

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The Parallel Processing Compute Server

et al. 1991

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The Parallel Processing Compute Server (PPCS) is a distributed-memory multiprocessing system consisting of System/370™ microprocessors (33 at present) interconnected through a matrix switch. This paper describes the hardware configuration, the extensions to the System/370 instruction set that are provided to support the distributed memory and interprocessor signaling, the modifications to the VIUI/SP operating system that allow it to run effectively on many closely coupled processors (most of which have no disks), and the application-support layer, which permits FORTRAN programs to take advantage of the highly parallel environment. Development of the PPCS is a joint effort of the IBIVI Boblingen Development Laboratory and the IBM Thomas J. Watson Research Center. A prototype PPCS has been installed at CERN. IntroductionThe Parallel Processing Compute Server (PPCS) is a distributed-memory multiprocessor that uses message passing for interprocessor communication. It comprises an IBM Enterprise System/9373 (ES/9373) Model 30' [1] 1 The ES/9373 Model 30 is an entry-level processor of the Enterprise System/QSTO™ (ES/9370™), which is a family of mM System/370™ processors that support many users and applications in the commercial, engineering, scientific, and industrial environments. integrated host (I-host) system and 32 (at present) System/370 satellite processors [2], all interconnected via a matrix switch designed to accommodate 62 ports. The I-host is the only processor with I/O capability; otherwise, the satellite processors are functionally identical to the I-host processor. Running under the control of Parallel VM, a modified form of the IBM Virtual Machine/System Product (VM/SP) operating system [3], the PPCS is suitable for a variety of numerically intensive computing programs.Parallel VM features "diskless" operation on the satellite processors (but is designed to exploit I/0-capable satellite processors, if they exist), fast interprocessor communications, local and remote inter-virtual-machine message-passing, and, to a large degree, a single-system image as seen by the application programmer.Distributed VS FORTRAN, a prototype programming environment for PPCS, has been developed. VS FORTRAN [4] application programs must be reorganized by the user to exploit parallel processing by originating, scheduling, and synchronizing subtasks. A subroutine library for task management and data transfer has been developed in the spirit of IBM Parallel FORTRAN [5]. The implementation of this Distributed VS FORTRAN library is based on a CMS [3] extension, called CS/X, that takes advantage of the Parallel VM functions.A PPCS with 32 satellite processors. Parallel VM, and CS/X has been installed at the European Organization for Nuclear Research (CERN) and is running applications used by the high-energy physics (HEP) community. At CERN, ®Copyright 1991 by International Business Machines Corporation. Copying in printed form for private use is permitted without payment of royalty provided that (1) each reproduction is done w...

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Section: Resultsmentioning

confidence: 99%

Section: Performancementioning

confidence: 98%

The Parallel Processing Compute Server

et al. 1991

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“…Track reconstruction in the spectrometer is performed by the TRIDENT programme [11]. The use of the Decay Detector (DkD) and the Vertex Detector (VxD) and the specic needs of the WA92 experiment required several modications and additions that are described below.…”

Section: O-line Reconstructionmentioning

confidence: 99%

“…For the W target a 10% higher multiplicity w as observed.) -P erform a global track t using the selected hits in the chambers and the silicon detectors following the method described in [11]. The full error matrix for the space points is used in the t. It includes the measurement errors and the contribution of the multiple scattering in the DkD and VxD planes.…”

Section: O-line Reconstructionmentioning

confidence: 99%

WA92: a fixed target experiment to trigger on and identify beauty particle decays

Adamovich

Adinolfi

Alexandrov

et al. 1996

Nuclear Instruments and Methods in Physics Research Section A:

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We describe the detectors and trigger system used in the CERN WA92 experiment. The experiment was designed to study the production and decay of beauty particles from 350 GeV/c interactions in copper and tungsten targets. Charged particle tracking is performed using the Omega spectrometer. Silicon microstrip detectors are used to provide precise tracking information in the region of the production and the decay of heavy-avoured particles and to trigger on the resulting high impact parameter tracks. The precision of vertex reconstruction corresponds to 3:7% of the mean B-decay proper lifetime. Lepton and high transverse momentum hadron signals are also used in the trigger, which accepts 23% of B-decays and rejects 98.4% of non-beauty i n teractions.

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“…We n o w aim to identify the decay v ertex of an event's second beauty particle. Before proceeding, we use an interactive v ersion of our reconstruction program [5,10] to improve the vertex measurement accuracy, fundamental to the determination of . The interactive program allows us to correct errors in the assignments of hits to tracks, and in the assignments of tracks to vertices.…”

mentioning

confidence: 99%