Abstract
The SAPHIR detector at the ELSA storage ring of the Physics Institute of Bonn University is designed to measure multi-particle final states. The momenta of the charged particles are measured by a drift chamber system. Different types of particles are identified by their time of flight using a scintillation counter system. Photons are detected by a large area (16 m{sup 2} in forward direction) shower counter arrangement. The shower counter system consisting of 98 modules is a metal-gas sandwich type which combines a good energy resolution (13.5% 1/{radical}E[GeV]) with a good spatial resolution (13 mm at 1 GeV). This paper describes the monitor system which has been built to measure and control the gas gain. Different methods are discussed. The gain is stabilized by using a system of small proportional tubes having the same geometry as those to be stabilized. These tubes are irradiated through a thin window by an {sup 55}Fe source. The spectra are analysed by a computer program which detects gain drifts and compensates them by controlling the HV accordingly. A second measurement of the gas gain is performed using cosmic muons. Combining these two methods a stabilization of the detector pulse height better than 3% could
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Citation Formats
Guse, B.
Procedure for monitoring and calibration of the photon detection system of the SAPHIR spectrometer; Verfahren zur Ueberwachung und Kalibration des Photonennachweissystems des SAPHIR-Spektrometers.
Germany: N. p.,
1991.
Web.
Guse, B.
Procedure for monitoring and calibration of the photon detection system of the SAPHIR spectrometer; Verfahren zur Ueberwachung und Kalibration des Photonennachweissystems des SAPHIR-Spektrometers.
Germany.
Guse, B.
1991.
"Procedure for monitoring and calibration of the photon detection system of the SAPHIR spectrometer; Verfahren zur Ueberwachung und Kalibration des Photonennachweissystems des SAPHIR-Spektrometers."
Germany.
@misc{etde_10112657,
title = {Procedure for monitoring and calibration of the photon detection system of the SAPHIR spectrometer; Verfahren zur Ueberwachung und Kalibration des Photonennachweissystems des SAPHIR-Spektrometers}
author = {Guse, B}
abstractNote = {The SAPHIR detector at the ELSA storage ring of the Physics Institute of Bonn University is designed to measure multi-particle final states. The momenta of the charged particles are measured by a drift chamber system. Different types of particles are identified by their time of flight using a scintillation counter system. Photons are detected by a large area (16 m{sup 2} in forward direction) shower counter arrangement. The shower counter system consisting of 98 modules is a metal-gas sandwich type which combines a good energy resolution (13.5% 1/{radical}E[GeV]) with a good spatial resolution (13 mm at 1 GeV). This paper describes the monitor system which has been built to measure and control the gas gain. Different methods are discussed. The gain is stabilized by using a system of small proportional tubes having the same geometry as those to be stabilized. These tubes are irradiated through a thin window by an {sup 55}Fe source. The spectra are analysed by a computer program which detects gain drifts and compensates them by controlling the HV accordingly. A second measurement of the gas gain is performed using cosmic muons. Combining these two methods a stabilization of the detector pulse height better than 3% could be achieved. Cosmic muons have also been used to calibrate the single modules relative to each other. The last part of the paper describes a first absolute calibration of the shower counter system done in two different ways. First the e{sup +}e{sup -} pairs were used to calibrate the modules in the middle plain of the calorimeter. The second method exploited the decay photons of neutral pions. Both methods were found to yield consistent results. (orig.).}
place = {Germany}
year = {1991}
month = {Jul}
}
title = {Procedure for monitoring and calibration of the photon detection system of the SAPHIR spectrometer; Verfahren zur Ueberwachung und Kalibration des Photonennachweissystems des SAPHIR-Spektrometers}
author = {Guse, B}
abstractNote = {The SAPHIR detector at the ELSA storage ring of the Physics Institute of Bonn University is designed to measure multi-particle final states. The momenta of the charged particles are measured by a drift chamber system. Different types of particles are identified by their time of flight using a scintillation counter system. Photons are detected by a large area (16 m{sup 2} in forward direction) shower counter arrangement. The shower counter system consisting of 98 modules is a metal-gas sandwich type which combines a good energy resolution (13.5% 1/{radical}E[GeV]) with a good spatial resolution (13 mm at 1 GeV). This paper describes the monitor system which has been built to measure and control the gas gain. Different methods are discussed. The gain is stabilized by using a system of small proportional tubes having the same geometry as those to be stabilized. These tubes are irradiated through a thin window by an {sup 55}Fe source. The spectra are analysed by a computer program which detects gain drifts and compensates them by controlling the HV accordingly. A second measurement of the gas gain is performed using cosmic muons. Combining these two methods a stabilization of the detector pulse height better than 3% could be achieved. Cosmic muons have also been used to calibrate the single modules relative to each other. The last part of the paper describes a first absolute calibration of the shower counter system done in two different ways. First the e{sup +}e{sup -} pairs were used to calibrate the modules in the middle plain of the calorimeter. The second method exploited the decay photons of neutral pions. Both methods were found to yield consistent results. (orig.).}
place = {Germany}
year = {1991}
month = {Jul}
}