This article describes the design, construction and use of a calibration and monitoring system, based on movable 137Cs γ-ray sources, for the ATLAS Tile Calorimeter (TileCal). The sources, propelled ...by a water-based liquid through tubes that traverse all the calorimeter's cells, produce signals that precisely characterise the response of each tile, thereby providing very granular and accurate data on the response of TileCal to particles. The system has been used to guide and control the quality of the optical instrumentation of all TileCal modules, to set and equalise the dynamic range of the response to physics data, and to set the energy scale of the readout system. In the ATLAS cavern, periodic measurements of the whole detector's response to 137Cs sources allow monitoring the uniformity and stability of all the calorimeter's cells as well as maintaining precise knowledge of its energy calibration. The design of the source hydraulic drive system's hardware and software, the data acquisition system and the data processing algorithms are described. Finally, the results of this two-decade program are shown.
Cesium monitoring system for ATLAS Tile Hadron Calorimeter Starchenko, E; Blanchot, G; Bosman, M ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2002, Letnik:
494, Številka:
1
Journal Article
Recenzirano
Odprti dostop
A system to calibrate and monitor ATLAS Barrel Hadronic Calorimeter (TileCal) is under construction at CERN Laboratory. A movable radioactive source driven by a liquid flow travels through the ...calorimeter body deposing a known energy to the calorimeter cells. Extensive R&D studies have been carried out and the main system parameters are evaluated. The prototypes are currently used for quality check and inter-calibration of the TileCal modules. A distributed control system, hardware as well as corresponding on-line and off-line software is developed.
A system using a radioactive
137
Cs
source to calibrate and monitor the Hadron Calorimeter (TileCal) of the ATLAS experiment at the LHC is described. The system includes a set of sensors to monitor ...the position of the source which moves via hydraulic propulsion. The design of the sensors, the corresponding electronic modules and their performance are detailed.
An online control system to calibrate and monitor ATLAS Barrel hadronic calorimeter (TileCal) with a movable radioactive source, driven by liquid flow, is described. To read out and control the ...system an online software has been developed, using ATLAS TDAQ components like DVS (Diagnostic and Verification System) to verify the hardware before running, IS (Information Server) for data and status exchange between networked computers, and other components like DDC (DCS to DAQ Connection), to connect to PVSS-based slow control systems of Tile Calorimeter, high voltage and low voltage. A system of scripting facilities, based on Python language, is used to handle all the calibration and monitoring processes from hardware perspective to final data storage, including various abnormal situations. A QT based graphical user interface to display the status of the calibration system during the cesium source scan is described. The software for analysis of the detector response, using online data, is discussed. Performance of the system and first experience from the ATLAS pit are presented.
Experimental investigations of candidates for hybrid mesons in the VES experiment at the Institute for High Energy Physics (Protvino) are surveyed. The data in question concern {pi}{sub 1}(1400) ...characterized by the exotic quantum numbers of J{sup PC} = 1{sup -+} and observed in the {eta}{pi}{sup -} final state; J{sup PC} 1{sup -+} {pi}{sub 1}(1600) in the {eta}{sup '}{pi}{sup -}, b{sub 1}(1235){pi}, and f{sub 1}(1285){pi}{sup -} final states; and J{sup PC} = 0{sup -+} {pi}(1800) in the f{sub 0}(980){pi}{sup -}, f{sub 0}(1300){pi}{sup -}, f{sub 0}(1500){pi}{sup -}, and a{sub 0}{sup -}(980){eta} final states. New results are given along with data published previously.
The results of a partial wave analysis of 3π system produced in the reaction
π
−
A →
π
+
π
−
π
−
A at the momentum of 36.6 GeV/c on beryllium target are presented. Resonant signals from
a′
1(1750),
a
...3(1860),
a
4(2050) are observed in different channels. Small bump at
M ≈ 1.6GeV in the exotic wave
J
PC
M
η
= 1
−+1
+ is seen. The combined analysis of VES data on this wave in η′π,
b
1(1235)
π and ϱπ channels points to the existence of a hybrid meson with
M ≈ 1.6 GeV.
Study of η ′ → η π + π − Dalitz plot Dorofeev, V.; Dzheliadin, R.; Ekimov, A. ...
Physics letters. B,
07/2007, Letnik:
651, Številka:
1
Journal Article
Recenzirano
The Dalitz plot of the
η
′
→
η
π
+
π
−
decay is studied using the data collected with the VES spectrometer in two different exclusive reactions,
π
−
p
→
η
′
n
(charge-exchange) and
π
−
N
→
η
′
π
−
N
...(diffractive-like production). The
η mesons from
η
′
decays were detected in the
η
→
γ
γ
mode. The coefficients for the matrix element squared decomposition are measured on the largest statistics of
η
′
decays reported so far; there are
∼
13.6
×
10
3
and
∼
6.5
×
10
3
decays after background subtraction in charge-exchange and diffractive-like production, respectively.
Preliminary results obtained by studying
K
−
π
−
,
K
−
π
−
π
0
, and
K
−
π
−
η
systems in the VES experiment are presented. No statistically significant signals from possible resonances were observed ...in two- and three-particle mass spectra of doubly charged (sub)systems.
Measurement of the f1(1285) → π+π−π0 decay Dorofeev, V.; Ekimov, A.; Gouz, Yu ...
European physical journal. A, Hadrons and nuclei,
5/2011, Letnik:
47, Številka:
5
Journal Article
Recenzirano
Odprti dostop
The isospin symmetry-breaking (ISB) decay
f
1
(1285) → π
+
π
−
π
0
has been studied at the VES facility. The branching ratio is measured:
. An upper limit for the
f
1
decay into
ρ
(770)π is obtained:
...BR
(
f
1
(1285) →
ρ
+−
π
−+
) < 0.31% at 95% CL.
A comparative study of the radiation damage caused by γ-quanta and hadron irradiation in polystyrene scintillation tiles produced by the injection molding technique and in wavelength shifting fibers ...is presented.
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