2,426 research outputs found
DIRC, a New Type of Particle Identification System for BABAR
The DIRC, a new type of Cherenkov imaging device, has been selected as the
primary particle identification system for the BABAR detector at the asymmetric
B-factory, PEP-II. It is based on total internal reflection and uses long,
rectangular bars made from synthetic fused silica as Cherenkov radiators and
light guides. In this paper, the principles of the DIRC ring imaging Cherenkov
technique are explained and results from the prototype program are presented.
The studies of the optical properties and radiation hardness of the quartz
radiators are described, followed by a discussion of the detector design.Comment: Invited talk given at the 5th international workshop on B-Physics at
hadron machines (Beauty'97), Santa Monica, California, USA, Oct 13-17, 1997.
(16pp
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Construction and performance of the BABAR-DIRC
The new type of ring-imaging Cherenkov detector technology called DIRC (an acronym for Detection of Internally Reflected Cherenkov (Light)) has been used successfully for hadronic particle identification in the BABAR experiment at the B Factory (PEP-II) located at the SLAC National Accelerator Laboratory. This paper describes the R&D for and the construction of the DIRC radiator bars and the performance of the DIRC during more than eight years of B Factory operation
DIRC, the Internally Reflecting Ring Imaging Cherenkov Detektor for BaBar: Properties of the Quartz Radiators
The DIRC is a Cherenkov imaging detector based on total internal reflection
for the BaBar detector at PEP-II. The principles of the DIRC ring imaging
Cherenkov technique are explained and its choice for the BaBar detector
particle identification system is motivated. The detector design and the status
of the R&D are discussed. Results of the measurement of the optical properties
and radiation damage of the the radiators, long rectangular bars made of
synthetic fused silica, are presented.Comment: 4 pp. Contributed to the 7th ICFA School on Instrumentation in
Elementary Particle Physics, Leon, Guanajuato, Mexico, 7-19 Jul 199
Optical Properties of the DIRC Fused Silica Cherenkov Radiator
The DIRC is a new type of Cherenkov detector that is successfully operating
as the hadronic particle identification system for the BABAR experiment at
SLAC. The fused silica bars that serve as the DIRC's Cherenkov radiators must
transmit the light over long optical pathlengths with a large number of
internal reflections. This imposes a number of stringent and novel requirements
on the bar properties. This note summarizes a large amount of R&D that was
performed both to develop specifications and production methods and to
determine whether commercially produced bars could meet the requirements. One
of the major outcomes of this R&D work is an understanding of methods to select
radiation hard and optically uniform fused silica material. Others include
measurement of the wavelength dependency of the internal reflection
coefficient, and its sensitivity to surface contaminants, development of
radiator support methods, and selection of good optical glue.Comment: 36 pages, submitted to Nuclear Instruments and Methods
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