Effect of dead material in a calorimeter Page: 3 of 14
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Effect of Dead Material in a Calorimeter
The existence of dead material in any practical calorimeter system is simply a fact
of life. The task for the designer, then, is to understand the impact on the Physics
in question, and strive to minimize it. The aim of this note is to use the "Hanging
File" test data  , which has fined grained individual readout of about 100 depth
segments, to explore this question. What is the impact of dead material on the
mean and r.m.s. of the hadronic distribution? The amount and location of the
dead material is varied.
It is important to remember in what follows that the Hanging File data was
calibrated, EM to HCAL compartment, so as to minimize the electron to pion
energy dependence. In practical terms e/pie was made = 1.0 at an incident energy
of about 100 GeV. Note that the Pb(EM) + Fe(HCAL) calorimeter was not a
compensating device. This fact will have implications in what follows.
The Shift of the Mean and Corrections
The data set used here was a small number of pions in a beam prepared at 250
GeV. The calorimeter consisted of 40 plates of 1/4" Pb followed by 55 plates of
1" Fe. The 95 samples of this particular array were each sampled by a 4 mm
plastic scintillator read out by a separate phototube. The depth in ECAL, 0.57 Xo
sampling, is 0.74 absorption lengths. The depth in HCAL, 1.45 Xo or 0.15
lambda sampling, gives a total HCAL depth of 8.35 absorption lengths ( 9.1 with
ECAL in front )
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Green, D. Effect of dead material in a calorimeter, report, October 1, 1995; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc628213/m1/3/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.