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Title: Aleph

Abstract

Aleph is a PIC/DSMC (particle-in-cell/direct simulation Monte Carlo) software package for the simulation of low temperature plasmas. Aleph is intended to be a production quality code capable of handling complex 3D geometries. Unstructured triangular (2D) or tetrahedral (3D) meshes are used to represent simulation domains. Aleph runs either in serial on a single processor or desktop machine, or can be run in parallel using the MPI message-passing library, to enable faster performance on large problems. Aleph employs dynamic load balancing to efficiently harness thousands of processors on high performance computers and enable simulations of up to millions of mesh elements and billions of particles. Multiple decompositions of the same mesh are used: one for the particles, and one for the field solves. Electrostatic fields are computed using an unstructured mesh finite element method (FEM), and the resulting linear systems are solved using solvers from the Trilinos package (http://trilinos.org/).

Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
Contributing Org.:
Matthew Hopkins, SNL 1118, (505-284-6376) Paul Crozier, SNL 1444, (505-845-9714) Russell Hooper, SNL 1446, (505-844-9219) Steve Plimpton, SNL 1444, (505-845-7873) Alan Williams, SNL 1543, (505-844-6047) Hal Meyer, Performance Software Solutions (Contract #1111463), (505-284-4764) Eric Eidson, SNL 6925, (505-284-4624) Larry Musson, SNL 1355, (505-284-3647) Tom Hughes, SNL 2735, (505-844-0477) Jeremiah Boerner, SNL 1516, (505-844-8336)Matthew Bettencourt, SNL 1352, (505-844-6991) Chris Moore, SNL 1352, (505-284-9853) Stan Moore, SNL 1444, (505-284-0568)
OSTI Identifier:
1231982
Report Number(s):
ALEPH; 003257MLTPL00
DOE Contract Number:
AC04-94AL85000
Resource Type:
Software
Software Revision:
00
Software Package Number:
003257
Software Package Contents:
Media Directory; Software Abstract; Media includes Source Code; User Guide; Compilation Instructions; Linking Instructions; Sample Problem Input Data; Sample Problem Output Data; Programmer Documentation; Installation Instructions;
Software CPU:
MLTPL
Open Source:
No
Source Code Available:
Yes
Country of Publication:
United States

Citation Formats

. Aleph. Computer software. Vers. 00. USDOE. 7 Aug. 2014. Web.
. (2014, August 7). Aleph (Version 00) [Computer software].
. Aleph. Computer software. Version 00. August 7, 2014.
@misc{osti_1231982,
title = {Aleph, Version 00},
author = {},
abstractNote = {Aleph is a PIC/DSMC (particle-in-cell/direct simulation Monte Carlo) software package for the simulation of low temperature plasmas. Aleph is intended to be a production quality code capable of handling complex 3D geometries. Unstructured triangular (2D) or tetrahedral (3D) meshes are used to represent simulation domains. Aleph runs either in serial on a single processor or desktop machine, or can be run in parallel using the MPI message-passing library, to enable faster performance on large problems. Aleph employs dynamic load balancing to efficiently harness thousands of processors on high performance computers and enable simulations of up to millions of mesh elements and billions of particles. Multiple decompositions of the same mesh are used: one for the particles, and one for the field solves. Electrostatic fields are computed using an unstructured mesh finite element method (FEM), and the resulting linear systems are solved using solvers from the Trilinos package (http://trilinos.org/).},
doi = {},
year = {Thu Aug 07 00:00:00 EDT 2014},
month = {Thu Aug 07 00:00:00 EDT 2014},
note =
}

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  • The Aleph experiment has over 700000 electronics channels and is expected to generate over 500 Mbytes of data per second. The data acquisition system (DAQ) has been designed to process information from different parts of the detector in parallel using a large number of processing elements. This talk describes the architecture of the software used to implement the readout functions and to configure the system for datataking.
  • We report on a preliminary measurement of the [ital B][sup 0][ital [bar B]0] mixing parameter [chi] using data recorded in 1990 and 1991 with the ALEPH detector. From a global fit to the lepton and dilepton spectra one gets [chi]=13.7[plus minus]1.5[plus minus]0.7%. After folding in the value obtained from the 1990 jet charge analysis the combined value is [chi]=13.4[plus minus]1.3[plus minus]0.8%
  • Since August 1989 the ALEPH detector is collecting data on e[sup +]e[sup [minus]] collisions provided by the LEP storage ring at CERN. Its main tracking detector, a time projection chamber, has about 50,000 channels, each recording 512 samples of incoming ionization. The ALEPH TPC data acquisition system is based on 768 triple width Fastbus modules, name TPDs, and 36 double width Fastbus modules, named TPPs. The TPC DAQ system performance has been satisfactory since the beginning of LEP physics in 1989, throughout more than two years of operation. The task to coordinate, to reliably operate, to monitor and to maintainmore » several hundreds of complex custom hardware devices has been accomplished. In this paper the performance and the implementation of the TPC DAQ system are presented; furthermore, it is shown how online data processing is used to obtain a substantial reduction of the data volume.« less
  • A detailed computer simulation, using an IBM standard software package, has been run to determine the optimal configuration of the Aleph Data Acquisition System, to select the read-out and communication protocols inside the system and to spot possible sources of dead-locks. Results are presented, which proved to be nontrivial and essential to the project. Such or equivalent approaches are mandatory in the design phase of the DAQ systems at the nextcoming large accelerators.

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