Development of a data acquisition system for the BABAR CP violation experiment

Author

Claus, R. ; Grosso, P. ; Hamilton, R.T. ; Huffer, M.E. ; Grady, C. P O´ ; Russell, J.J. ; Scott, I.

Author_Institution

Linear Accel. Center, Stanford Univ., CA, USA

fYear

1999

fDate

1999

Firstpage

144

Lastpage

149

Abstract

Experiences developing a data acquisition system for the BABAR CP violation experiment located at the Stanford Linear Accelerator Center are presented. The BABAR detector consists of multiple independent subdetectors joined with a data acquisition system consisting of a large number of embedded PowerPC single board computers residing in VME crates. The data acquisition software is layered on the VxWorks real-time operating system. It is partitionable to allow subsystems (as well as test stands) to operate independently. Data is assimilated into events through a combination of shared memory and a high performance network. This system presents data to a UNIX farm via a high speed non-blocking ethernet switch at a rate of 2 KHz. Topics such as bootstrapping and loading 200 processors, NFS file access for these processors and software development and deployment are discussed

Keywords

Unix; computer bootstrapping; data acquisition; high energy physics instrumentation computing; BABAR experiment; CP violation; PowerPC; UNIX; VME crates; VxWorks; bootstrapping; data acquisition; ethernet; shared memory; Data acquisition; Detectors; Embedded computing; Ethernet networks; Linear accelerators; Operating systems; Programming; Real time systems; Switches; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Real Time Conference, 1999. Santa Fe 1999. 11th IEEE NPSS

Conference_Location

Sante Fe, NM

Print_ISBN

0-7803-5463-X

Type

conf

DOI

10.1109/RTCON.1999.842587

Filename

842587