Simulation of hanging file experiments with CALOR89 Page: 6 of 24
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4. Claclded Scintillator Configurations
Configurations 6 and 7 have some of the scintillator plates cladded with 1/16"
aluminium. The purpose of this study was to compare the effect of scintillator
cladding on the calorimeter parameters. It was also interesting for us to check the
reliability of CALOR89 predictions for systems with very thin layers of material. It
has been observed earlier[4}[5} that the properties of the thin layer configurations
( 1mm) are sensitive to the EGS input parameters like the multiple scattering step
size mnd the energy cuts(the energies at which the particle histories are terminated).
Table I gives the summary results of these simulations, The parameters for
the uncladded configurations are also given for comparison. Two calculations were
repeated with low energy cuts in EGS4 (200 keV for electrons and 10 keV for pho-
tons). The results show that the 1/16" aluminium cladding has a non-negligible
effect on the e/7r ratio for the lead configuration whereas the cladding has no ef-
fect for the iron configuration. The effect of cladding on the electromagnetic and
hadronic resolutions is negligible for both the configurations. The calculations with
low energy cuts in EGS4 did not show any significant effects which proves that the
1/16" scintillator cladding can be simulated with the normal input parameters of
EGS[4]. These results are also verified by the hanging file experiments.
5. Depth Profiles of Hadronic Showers
Figures 9 and 10 gives the typical depth profiles for the 3/4" iron-scintillator
configuration. The solid histograms are the simulated profiles and the dotted the
hanging file measurements. The particle energies are 25 GeV and 100 GeV. The
events which deposits >95% of the energy in the first 20 radiation lengths of the
calorimeter are rejected. These were typically 1% of the events, The two his-
tograms are normalized such that the total energy is conserved. The figures show
that the agreement is good for both the energies. Tlhe CALOR89 profiles have a
slight tendency to fall quicker than the measurements. But the overall agreement is
quite desirable.. m
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Job, P. K.; Price, L. E.; Proudfoot, J.; Handler, T. & Gabriel, T. A. Simulation of hanging file experiments with CALOR89, report, June 1, 1992; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1315187/m1/6/: accessed April 27, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.