Publications (3)0 Total impact
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E. Berger,
R. Blair,
J Dawson,
T Fuess,
V Guarino,
N Hill,
S Magill,
E May,
L Nodulman,
L Price, [......],
V. Boldea,
S. Dita,
M. Cobal,
O Gildemeister,
A Henriques,
M. Marques,
M. Nessi,
L. Poggioli,
P Sonderegger,
G Karapetian
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ABSTRACT: After the first positive results of 1993, the RD34 collaboration pursued additional R&D on the field of sampling hadron calorimetry. The proposed calorimeter, adopted by the ATLAS experiment, uses steel as absorber and scintillating tiles placed in planes perpendicular to the colliding beams. Its mechanical design, component tests, scintillator properties and radiation hardness as well as the results of a series of beam tests are presented. 2 Contents 1 Introduction 2 2 Detector Construction and Components R&D 3 2.1 Prototypes Construction (Mechanics) : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 3 2.2 Scintillator Tiles : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 4 2.2.1 Tile Manufacture : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 5 2.2.2 Tile Uniformity : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 7 2.3 The WLS Fibres : : : : : : : : : : : : : : : : : : : : : : : : ...
10/1995;
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E. Berger,
R. Blair,
J Dawson,
T Fuess,
V Guarino,
N Hill,
S Magill,
E May,
L Nodulman,
L.E. Price, [......],
E Gallas,
J Li,
L Sawyer,
R Stephens,
M Turcotte,
A White,
H. Hakopian,
V Grabskii,
E. Mnatasakanian,
A Vartapetian
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ABSTRACT: The energy loss spectrum of 150 GeV muons has been measured with a prototype of the ATLAS hadron calorimeter in the H8 beam of the CERN SPS. The differential probability ${\rm {d}}P/{\rm {d}}v$ per radiation length of a fractional energy loss $v = \Delta E_{\mu} / E_{\mu}$ has been measured in the range $v$ = 0.01 $\div$ 0.95; it is compared with the theoretical predictions for energy losses due to bremsstrahlung and production of electron-positron pairs or of energetic knock-on electrons. The integrated probability $\int_{0.01}^{0.95} ({\rm {d}}P/{\rm {d}}v) {\rm {d}}v$ is $(1.610\pm0.015_{{\rm {stat}}}\pm0.105_{{\rm {syst}}})\cdot10^{-3}$ in agreement with the theoretical predictions $1.556\cdot10^{-3}$ and $1.619\cdot10^{-3}$. Agreement with theory is also found in two intervals of $v$ where production of electron-positron pairs and knock-on electrons dominates. In the region of bremsstrahlung dominance ($v$ = 0.12 $\div$~0.95) the measured integrated probability $(1.160\pm0.040_{{\rm {stat}}}\pm0.075_{{\rm {syst}}})\cdot 10^{-4}$ is in agreement with the theoretical value of $1.185 \cdot 10^{-4} $, obtained using the Petrukhin and Shestakov description of the bremsstrahlung process. The same result is about 3.6 standard deviations (defined as the quadratic sum of statistical and systematic errors) lower than the theoretical prediction of $ 1.472\cdot 10^{-4}$, obtained using Tsai's description of bremsstrahlung.
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E. Berger,
R. Blair,
J Dawson,
T A Fuess,
V Guarino,
N Hill,
S Magill,
E May,
L Nodulman,
L.E. Price, [......],
E.J. Gallas,
J Li,
L Sawyer,
R Stephens,
M Turcotte,
A White,
H H Hakopian,
V Grabskii,
E A Mnatzakanian,
A H Vartapetian
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[hide abstract]
ABSTRACT: The energy loss spectrum of 150 GeV muons has been measured with a prototype of the ATLAS hadron calorimeter in the H8 beam of the CERN SPS.\\ The differential probability $dP/dv$ per radiation length of a fractional energy loss $v = \Delta E_{\mu} / E_{\mu}$ has been measured in the range $v = 0.01 \div 0.95 $; it is then compared with the theoretical predictions for energy losses due to bremsstrahlung and production of electron-positron pairs or of energetic knock-on electrons.\\ The integrated probability $\int_{0.01}^{0.95} (dP/dv) dv$ is $(1.610\pm0.015_{stat.}\pm0.105_{syst.})\cdot10^{-3}$ in agreement with the theoretical predictions of $1.556\cdot10^{-3}$ and $1.619\cdot10^{-3}$. %7.8.96 - start Agreement with theory is also found in two intervals of $v$ where production of electron-positron pairs and knock-on electrons dominates. In the region of bremsstrahlung dominance ($v = 0.12\div0.95$) the measured integrated probability $(1.160\pm0.040_{stat}\pm0.075_{syst})\cdot 10^{-4}$ is in agreement with the theoretical value of $1.185 \cdot 10^{-4} $, obtained using Petrukhin and Shestakov's \cite{PS} description of the bremsstrahlung process. The same result is about 3.6 standard deviations (defined as the quadratic sum of statistical and systematic errors) lower than the theoretical prediction of $ 1.472\cdot 10^{-4}$, obtained using Tsai's \cite{TS} description of bremsstrahlung.
