Abstract
The purpose of this thesis is to design a beam Cerenkov counter. This counter will provide an on line identification of the {Sigma}{sup -}, {Xi}{sup -} and {Omega}{sup -} hyperons (270 GeV/c) in the experiment WA89 at CERN. The acceptance of the detector should allow tagging these hyperons in a large momentum range ({+-} 25%) and for a beam divergence up to 250 microrad. The first part of this report is devoted to the physical goals such as the study of charmed baryons, the search of multiquark states, and the determination of hadronic and electromagnetic hyperon radii. The experimental WA89 setup is also presented. The major part deals with the design of the Cerenkov counter. The dimension of the detector, the Cerenkov angle value, the focal length of the spherical mirror, etc... are derived from a Monte-Carlo simulation. Various methods of simple photon detection (gaz detector: TEA, TMAE; solid detectors: PM and Image Intensifier) are investigated. The most performing solution uses two conical mirrors in order to reduce the size of the Cerenkov circles and an image intensifier (which detects the single photon) followed by an optical fiber matrix transmitting the luminous signal to 160 photomultipliers. The on line procedure
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Citation Formats
Touillon, R.
Beam Cherenkov counter conception for in line identification of 270 GeV/c {Sigma}{sup -} {Xi}{sup -} and {Omega}{sup -}; Conception d`un compteur Cerenkov de faisceau pour l`identification en ligne des hyperons {Sigma}{sup -}, {Xi}{sup -} et {Omega}{sup -} de 270 GeV/c.
France: N. p.,
1991.
Web.
Touillon, R.
Beam Cherenkov counter conception for in line identification of 270 GeV/c {Sigma}{sup -} {Xi}{sup -} and {Omega}{sup -}; Conception d`un compteur Cerenkov de faisceau pour l`identification en ligne des hyperons {Sigma}{sup -}, {Xi}{sup -} et {Omega}{sup -} de 270 GeV/c.
France.
Touillon, R.
1991.
"Beam Cherenkov counter conception for in line identification of 270 GeV/c {Sigma}{sup -} {Xi}{sup -} and {Omega}{sup -}; Conception d`un compteur Cerenkov de faisceau pour l`identification en ligne des hyperons {Sigma}{sup -}, {Xi}{sup -} et {Omega}{sup -} de 270 GeV/c."
France.
@misc{etde_10143754,
title = {Beam Cherenkov counter conception for in line identification of 270 GeV/c {Sigma}{sup -} {Xi}{sup -} and {Omega}{sup -}; Conception d`un compteur Cerenkov de faisceau pour l`identification en ligne des hyperons {Sigma}{sup -}, {Xi}{sup -} et {Omega}{sup -} de 270 GeV/c}
author = {Touillon, R}
abstractNote = {The purpose of this thesis is to design a beam Cerenkov counter. This counter will provide an on line identification of the {Sigma}{sup -}, {Xi}{sup -} and {Omega}{sup -} hyperons (270 GeV/c) in the experiment WA89 at CERN. The acceptance of the detector should allow tagging these hyperons in a large momentum range ({+-} 25%) and for a beam divergence up to 250 microrad. The first part of this report is devoted to the physical goals such as the study of charmed baryons, the search of multiquark states, and the determination of hadronic and electromagnetic hyperon radii. The experimental WA89 setup is also presented. The major part deals with the design of the Cerenkov counter. The dimension of the detector, the Cerenkov angle value, the focal length of the spherical mirror, etc... are derived from a Monte-Carlo simulation. Various methods of simple photon detection (gaz detector: TEA, TMAE; solid detectors: PM and Image Intensifier) are investigated. The most performing solution uses two conical mirrors in order to reduce the size of the Cerenkov circles and an image intensifier (which detects the single photon) followed by an optical fiber matrix transmitting the luminous signal to 160 photomultipliers. The on line procedure for calculating the radius of each circle (identification of the particle) is studied in detail. Finally, the optimization of the optical system to achromatize the Cerenkov light is discussed.}
place = {France}
year = {1991}
month = {Jun}
}
title = {Beam Cherenkov counter conception for in line identification of 270 GeV/c {Sigma}{sup -} {Xi}{sup -} and {Omega}{sup -}; Conception d`un compteur Cerenkov de faisceau pour l`identification en ligne des hyperons {Sigma}{sup -}, {Xi}{sup -} et {Omega}{sup -} de 270 GeV/c}
author = {Touillon, R}
abstractNote = {The purpose of this thesis is to design a beam Cerenkov counter. This counter will provide an on line identification of the {Sigma}{sup -}, {Xi}{sup -} and {Omega}{sup -} hyperons (270 GeV/c) in the experiment WA89 at CERN. The acceptance of the detector should allow tagging these hyperons in a large momentum range ({+-} 25%) and for a beam divergence up to 250 microrad. The first part of this report is devoted to the physical goals such as the study of charmed baryons, the search of multiquark states, and the determination of hadronic and electromagnetic hyperon radii. The experimental WA89 setup is also presented. The major part deals with the design of the Cerenkov counter. The dimension of the detector, the Cerenkov angle value, the focal length of the spherical mirror, etc... are derived from a Monte-Carlo simulation. Various methods of simple photon detection (gaz detector: TEA, TMAE; solid detectors: PM and Image Intensifier) are investigated. The most performing solution uses two conical mirrors in order to reduce the size of the Cerenkov circles and an image intensifier (which detects the single photon) followed by an optical fiber matrix transmitting the luminous signal to 160 photomultipliers. The on line procedure for calculating the radius of each circle (identification of the particle) is studied in detail. Finally, the optimization of the optical system to achromatize the Cerenkov light is discussed.}
place = {France}
year = {1991}
month = {Jun}
}