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ABSTRACT: An intense muon-neutrino beam (10<sup>17</sup> <sub>Vmu</sub>/day) is generated at CERN and directed towards the Gran Sasso National Laboratory,LNGS, in Italy, 732 km from CERN. In the presently approved physics programme, it is foreseen to run the CNGS facility with 4.5 <sup>middot</sup>10<sup>19</sup> protons per year for five years. During a nominal CNGS cycle, i.e. every 6s, two nominal SPS extractions of 2.4<sup>.</sup> 10<sup>13</sup> protons each at 400GeV/c are sent down the proton beam line to the target. The CNGS secondary beam line, starting with the target, has to cope with this situation, which pushes the beam line equipment and instrumentation to the limits of radiation hardness and mechanical stresses during the CNGS operation. An overview of the CNGS secondary beam line is given. Emphasis is on the target, the magnetic focusing lenses (horn and reflector) and the muon monitors. The performance of the secondary beam line during beam commissioning and physics operation is discussed and measurements are compared with simulations.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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ABSTRACT: After the proposal during Nufact99 to use a horn as pion collection device, a first prototype has been designed and built. This paper reviews the current status of the neutrino factory horn studies at CERN.
Journal of Physics G Nuclear and Particle Physics 07/2003; 29(8):1801. · 4.18 Impact Factor
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W. Andreazza,
R. Avramidou,
Z. Banhidi,
J. Berbiers,
C.W. Fabjan,
W. Lampl, S. Rangod,
F Rohrbach,
E. Sbrissa,
S Schuh,
Y. Sedykh,
Y. Smirnov,
M. Woudstra
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ABSTRACT: The ATLAS collaboration has recently started the construction of its detector for the LHC at CERN. An essential part of its Muon Spectrometer is based on Monitored Drift Tube (MDT) technology. It consists of about 1200 large muon drift chambers that will be built at 13 institutes spread all over the world. The MDT chambers require an exceptional mechanical construction accuracy of better than 20 μm. The construction quality of the chambers is controlled using X-ray tomography. A dedicated X-ray tomograph has been developed at CERN since 1996. This instrument measures the chamber wire positions with a 2 μm statistical and 2 μm systematic uncertainty over the full tomograph working area of 2.2 × 0.6 m<sup>2</sup>. During the four-year construction phase of the MDT chambers, the X-ray tomograph will be the key tool for ensuring consistent chamber production quality with a sampling rate of ∼15%. To achieve this program efficiently, an effort for complete automation of the tomograph operation is underway. Since mid-2000, first modules from 11 of the construction sites have been measured. Results from this site certification process have demonstrated the essential role of the X-ray tomograph in assessing the validity of the various construction steps.
Nuclear Science Symposium Conference Record, 2001 IEEE; 12/2001
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S. Schuh,
R. Avramidou,
Z. Banhidi,
C.W. Fabjan,
W. Lampl,
M. Marchesotti, S. Rangod,
E. Sbrissa,
Y. Smirnov,
R. Voss,
M. Woudstra,
V. Zhuravlov
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ABSTRACT: A dedicated X-ray tomograph has been developed at CERN to control the required wire placement accuracy of better than 20 μm of the 1200 Monitored Drift Tube Chambers which make up most of the precision chamber part of the ATLAS Muon Spectrometer. The tomograph allows the chamber wire positions to be measured with a 2 μm statistical and 2 μm systematic uncertainty over the full chamber cross-section of 2.2×0.6 m2. Consistent chamber production quality over the 4-year construction phase is ensured with a ∼15% sampling rate. Measurements of about 70 of the 650 MDT chambers so far produced have been essential in assessing the validity and consistency of the various construction procedures.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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R Avramidou,
J Berbiers,
C Boudineau,
C Dechelette,
D Drakoulakos,
C Fabjan,
S Grau,
E Gschwendtner,
J.-M Maugain,
H Rieder, S Rangod,
F Rohrbach,
E Sbrissa,
E Sedykh,
I Sedykh,
Y Smirnov,
L Vertogradov,
I Vichou
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ABSTRACT: A gigantic detector, the ATLAS project, is under construction at CERN for particle physics research at the Large Hadron Collider which is to be ready by 2006. An X-ray tomograph has been developed, designed and constructed at CERN in order to control the mechanical quality of the ATLAS muon chambers. We reached a measurement accuracy of 2 μm systematic and 2 μm statistical uncertainties in the horizontal and vertical directions in the working area 220 cm (horizontal)×60 cm (vertical). Here we describe in detail the fundamental approach of the basic principle chosen to achieve such good accuracy. In order to crosscheck our precision, key results of measurements are presented.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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ABSTRACT: For the Large Hadron Collider (LHC), ATLAS, a large general-purpose detector for physics experiment, is under construction. The muon spectrometer of ATLAS is on the scale of a very large industrial project: 1200 large monitored drift tubes (MDT) chambers will be built aiming at an exceptional quality in terms of mechanical accuracy, material reliability, assembly, and monitoring. For Quality Control, an X-ray tomograph, monitored by a set of interferometers, has been developed and built at CERN. The tomograph provides an accuracy below 10 μm in the determination of the position of each MDT drift tube. First, results have been obtained on MDT prototypes.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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G. Aad,
E. Abat,
J Abdallah,
AA Abdelalim,
A. Abdesselam,
O. Abdinov,
BA Abi,
M Abolins,
H Abramowicz,
E. Acerbi, [......],
G. Unel,
Y. Unno,
E. Urkovsky,
G. Usai,
Y. Usov,
L Vacavant,
V Vacek,
B Vachon,
S. Vahsen,
C. Valderanis
