-
M G Catanesi,
M T Muciaccia,
E Radicioni,
S Simone,
R Edgecock,
M. Ellis,
S Robbins,
F J P Soler,
C Gössling,
M Mass, [......],
G Giannini,
G. Santin,
Y. Hayato,
A Ichikawa,
T Kobayashi,
J Burguet-Castell,
J J Gómez-Cadenas,
P Novella,
M. Sorel,
A Tornero
-
R. J. Abrams,
S. K. Agarwalla,
A. Alekou,
C. Andreopoulos,
C. M. Ankenbrandt,
S. Antusch,
M Apollonio,
M Aslaninejad,
J. Back,
P. Ballett, [......],
S Striganov,
J Tang,
J. W. G. Thomason,
L Tortora,
R. Tsenov,
W. Winter,
H. Witte,
O. Yasuda,
C. Y. Yoshikawa,
M. Zisman
[show abstract]
[hide abstract]
ABSTRACT: The International Design Study for the Neutrino Factory (the IDS-NF) was
established by the community at the ninth "International Workshop on Neutrino
Factories, super-beams, and beta- beams" which was held in Okayama in August
2007. The IDS-NF mandate is to deliver the Reference Design Report (RDR) for
the facility on the timescale of 2012/13. In addition, the mandate for the
study [3] requires an Interim Design Report to be delivered midway through the
project as a step on the way to the RDR. This document, the IDR, has two
functions: it marks the point in the IDS-NF at which the emphasis turns to the
engineering studies required to deliver the RDR and it documents baseline
concepts for the accelerator complex, the neutrino detectors, and the
instrumentation systems. The IDS-NF is, in essence, a site-independent study.
Example sites, CERN, FNAL, and RAL, have been identified to allow site-specific
issues to be addressed in the cost analysis that will be presented in the RDR.
The choice of example sites should not be interpreted as implying a preferred
choice of site for the facility.
12/2011;
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E. Radicioni,
N. Abgrall,
J. Alcaraz,
A. Cervera,
P. Bene, A. Blondel,
D. Ferrere,
G.V. Jover,
T. Lux,
F. Masciocchi,
F. Nova,
E. Perrin,
J.-P. Richeux,
A.Y. Rodriguez,
F. Sanchez,
R. Schroeter
[show abstract]
[hide abstract]
ABSTRACT: A large size prototype of a TPC with GEM amplification has been successfully built and operated. To obtain an active area larger than the one provided by the largest GEM foil on the market, 2 independent GEM towers have been hosted on a single pad plane minimising the dead space between the towers. This readout structure has been inserted in a test-bed available at CERN, inherited from the HARP-TPC installation at the PS East Hall, made by a cylindrical field-cage of 80 cm diameter and around 150 cm active length, all placed inside a solenoid magnet capable of 0.7 T. This setup is equipped with about 1500 readout channels. The initial choice for relatively large squared pads (8mm) is driven by the need to study the performances in view of a neutrino oscillation experiment, where the track density is low. A systematic study of the performances has been performed as a function of several parameters like the operating voltages of the GEM towers, the magnetic and the drift fields and the gas mixture. Special care has been taken in the study of the gas, with a large range of mixtures including Ar:CF<sub>4</sub>:iC<sub>4</sub>H<sub>10</sub>.
Nuclear Science Symposium Conference Record, 2006. IEEE; 12/2006
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[show abstract]
[hide abstract]
ABSTRACT: The recent discovery that neutrinos have masses opens a wide new field of experimentation. Accelerator-made neutrinos are essential in this program. Ideas for future facilities include high intensity muon neutrino beams from pion decay (`SuperBeam'), electron neutrino beams from nuclei decays (`Beta Beam'), or muon and electron neutrino beams from muon decay (`Neutrino Factory'), each associated with one or several options for detector systems. Each option offers synergetic possibilities, e.g. some of the detectors can be used for proton decay searches, while the Neutrino Factory is a first step towards muon colliders. A summary of the perceived virtues and shortcomings of the various options, and a number of open questions are presented.
07/2006;
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A. Bazan,
F. Bellachia, A. Blondel,
J. Colas,
M. Citterio,
M.D. Gomez,
L. Fayard,
G. Ionescu,
M. Kado,
A. Karev, [......],
L. Poggioli,
J. Prast,
H. Przysiezniak,
I.R. Dachs,
S. Simion,
W. Sippach,
A. Straessner,
G. Unal,
H. Wilkens,
I. Wingerter
[show abstract]
[hide abstract]
ABSTRACT: The Liquid Argon calorimeters play a central role in the ATLAS experiment. The environment at the LHC collider imposes challenging tasks to their read-out system. To achieve measurements of particles and trigger signals at high precision, the detector signals are processed at various stages before reaching the Data Acquisition system (DAQ). Signals from the calorimeter cells are received by front-end boards, which digitize and sample the incoming pulse. Read-out Driver (ROD) boards further process the data at a trigger rate of up to 75 kHz. An optimal filtering procedure is applied to optimize the signal-to-noise ratio. The ROD boards calculate precise energy, time and quality of the detector pulse, which are then sent to the DAQ. In addition, the RODs perform a monitoring of the data. The architecture of the ATLAS Liquid Argon detector read-out is discussed, in particular the design and functionality of the ROD board. Performance results obtained with ROD prototypes as well as experience from complete test setups with final production boards are reported.
IEEE Transactions on Nuclear Science 07/2006; · 1.45 Impact Factor
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V. Ableev,
F. Ambrosino,
M. Apollonio,
P. Bene, A. Blondel,
M.G. Catanesi,
G. Chiefari,
P. Chimenti,
P. Favaron,
U. Gastaldi, [......],
V. Palladino,
G. Prior,
E. Radicioni,
J.-P. Richeux,
M. Rigato,
L. Ropelewski,
L. Roscilli,
G. Saracino,
F. Sauli,
P. Temnikov
[show abstract]
[hide abstract]
ABSTRACT: TPG is the acronym for Time Projection chamber with GEM amplification, hexaboard read-out and FADC
electronics. We are constructing a TPG read-out module with three GEM foils (30 cm diameter) and a read-out board (30 cm diameter active surface) covered with hexagonal pads of 300 mm size. Aligned pads are connected in parallel to one strip out of three sets of parallel strips. Each strip is read by FADC electronics. The test bench for the TPG head will be the HARP-TPC field cage. TPG characteristics, design and expected performances are discussed.
Nuclear Instruments and Methods in Physics Research 02/2004; 518(A):113-116.
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A. Blondel,
M. Delmastro,
L. Fayard,
D. La Marra,
A. Leger,
P. Matricon,
G. Perrot,
L. Poggioli,
J. Prast,
I. Riu,
S. Simion
[show abstract]
[hide abstract]
ABSTRACT: The calorimetry of the ATLAS experiment takes advantage of different detectors based on the liquid Argon (LAr) technology. Signals from the LAr calorimeters are processed by various stages before being delivered to the Data Acquisition system. The calorimeter cell signals are received by the front-end boards, which digitize a predetermined number of samples of the bipolar waveform and sends them to the Read-Out Driver (ROD) boards. The ROD board receives triggered data from 1028 calorimeter cells, and determines the precise energy and timing of the signals by processing the discrete samplings of the pulse. In addition, it formats the digital stream for the following elements of the DAQ chain, and performs monitoring. The architecture and functionality of the ATLAS LAr ROD board are discussed, along with the final design of the Processing Unit boards housing the Digital Signal Processors (DSP).
Nuclear Science Symposium Conference Record, 2003 IEEE; 11/2003
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[show abstract]
[hide abstract]
ABSTRACT: A generation of ncutrino experiments have established that ncutrinos mix and probably have mass. The mixing phenomenon points to processes beyond those of the Standard Model, possibly at the Grand Unification energy scale.
02/2003;
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M Apollonio, A Blondel,
A. Broncano,
M Bonesini,
J. Bouchez,
A. Bueno,
M Campanelli,
D Casper,
G. Catanesi,
A. Cervera, [......],
A De Min,
J Ellis,
M. Fechner,
E Fernandez,
F. Ferri,
B. Gavela,
G Giannini,
A. Guglielmi,
P. Hernandez,
P. Huber
[show abstract]
[hide abstract]
ABSTRACT: A generation of neutrino experiments have established that neutrinos mix and probably have mass. The mixing phenomenon points to processes beyond those of the Standard Model, possibly at the Grand Unification energy scale. A extensive sequence of of experiments will be required to measure precisely all the parameters of the neutrino mixing matrix, culminating with the discovery and study of leptonic CP violation. As a first step, extensions of conventional pion/kaon decay beams, such as off-axis beams or low-energy super-beams, have been considered. These could yield first observations of ! e transitions at the atmospheric frequency, which have not yet been observed, and a first measurement of 13 . Experiments with much better flux control can be envisaged if the neutrinos are obtained from the decays of stored particles.
12/2002;
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P Gruber,
M. Aleksa,
JF Amand,
B. Autin,
JL Baldy,
M Benedikt,
R Bennett,
A. Bernadon, A Blondel,
K Bongardt, [......],
H Ullrich,
N Vassilopoulos,
A Verdier,
M Vretenar,
F. Wenander,
EJN Wilson,
C Wyss,
F Zimmermann,
M. Zisman,
P Zucchelli
CERN-PS-2002-080-PP. 02/2002;
-
[show abstract]
[hide abstract]
ABSTRACT: We consider the virtual effects of a general type of Anomalous (triple) Gauge Couplings on various experimental observables in the process of electron-positron annihilation into a final fermion-antifermion state. We show that the use of a recently proposed "$Z$-peak subtracted" theoretical description of the process allows to reduce substantially the number of relevant parameters of the model, so that a calculation of observability limits can be performed in a rather simple way. As an illustration of our approach, we discuss the cases of future measurements at LEP2 and at a new 500 GeV linear collider. Comment: 23 pages incl. 5 figures (e-mail renard@lpmsun2.lpm.univ-montp2.fr)
05/1996;
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J. Blietschau,
H. Deden,
F. J. Hasert,
W. Krenz,
D. Lanske,
J. Morfin,
M. Pohl,
K. Schultze,
H. Schumacher,
H. Weerts, [......],
D. Cavalli,
E. Fiorini,
A. Pullia,
M. Rollier,
B. Aubert,
D. Blum,
A. M. Lutz,
C. Pascaud,
F. W. Bullock,
A. G. Michette
[show abstract]
[hide abstract]
ABSTRACT: About 200 and 60 candidates for electron neutrino and antineutrino
interactions, respectively, have been analyzed in the heavy liquid
bubble chamber Gargamelle exposed to the CERN PS neutrino beam. Evidence
for scaling has been found for these interactions, with slopes of the
cross sections in good agreement with those obtained for muon neutrino
and antineutrino events in the same chamber. No evidence appears for
oscillations of neutrinos or antineutrinos, which would induce in the
present experiment an excess of electron or positron events. The
corresponding limits are given as functions of the mixing parameter, for
the finite mass Majorana neutrinos. The possibility of a multiplicative
law for the lepton number has also been investigated. A search for
isolated electron-positron pairs revealed no excess in the forward
direction, in contradiction to the expectation for muonic neutrino and
antineutrino decays. The corresponding limits on the c.m. half lifetimes
are given.
Now at Rutherford Laboratory, Chilton, Didcot, UK.
Nuclear Physics B 01/1978; 133:205-219. · 4.66 Impact Factor
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N. Armenise,
O. Erriquez,
M.T. Fogli-Muciaccia,
S. Natali,
S. Nuzzo,
F. Romano,
G. Bonneaud,
H. Burmeister,
G. Carnesecchi,
M. Haguenauer, [......],
S. Ragazzi,
M. Rollier,
L. Zanotti,
C. Arnault,
D. Blum,
P. Heusse,
C. Longuemare,
A.M. Lutz,
C. Pascaud,
J. Sleeman
[show abstract]
[hide abstract]
ABSTRACT: The first observation of the reaction νμ + e− → μ− + νe has been made in the bubble chamber Gargamelle exposed to the CERN SPS wide-band neutrino beam. A signal of 26 ± 6 events has been found. This is 0.90 ± 0.20 times the prediction of the V - A theory.
Physics Letters B.
-
J. Blietschau,
H. Deden,
F.J. Hasert,
W. Krenz,
J. Morfin,
K. Schultze,
L. Welch,
G. Bertrand-Coremans,
M. Dewitt,
H. Mulkens, [......],
M. Jaffre,
C. Longuemare,
A.M. Lutz,
C. Pascaud,
J.P. Vialle,
F.W. Bullock,
T.W. Jones,
A.G. Michette,
G. Myatt,
J. Pinfold
[show abstract]
[hide abstract]
ABSTRACT: An upper limit of 3 × 10−42Eν cm2 per electron, at 90% confidence level, has been obtained for the cross section of the process νμ + e− → νμ + e−, interpreted in the usual V-A framework, for an electron recoil energy larger than 0.3 GeV. This estimate is based on the observation of one candidate event in exposures of Gargamelle to the CERN PS neutrino beam.
Physics Letters B.
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V. Ableev,
F. Ambrosino,
M. Apollonio,
P. Bene, A. Blondel,
M.G. Catanesi,
G. Chiefari,
P. Chimenti,
P. Favaron,
U. Gastaldi, [......],
R. de Oliveira,
V. Palladino,
E. Radicioni,
J.-P. Richeux,
M. Rigato,
L. Ropelewski,
L. Roscilli,
G. Saracino,
F. Sauli,
P. Temnikov
[show abstract]
[hide abstract]
ABSTRACT: TPG is the acronym for a 3D imaging gas chamber with GEM amplification, hexaboard read-out and FADC electronics. We have constructed a TPG-head with three GEM foils (30 cm diameter) and a read-out board (30 cm diameter active surface) covered with 710,000 hexagonal pads of size. Aligned pads are connected in parallel to one strip out of three sets of 576 parallel strips ( pitch). The three sets of strips run at 120∘ from each other and at three different depths inside the hexaboard multilayer structure. Each strip is read out by FADC electronics. The TPG-head is under initial test in a small container with a drift volume 33 mm long and of 30 cm diameter. A 150 cm long drift volume inside a 0.7 T solenoidal magnetic field has been prepared by using HARP-TPC instrumentation as test bed.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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J Blietschau,
H Deden,
F J Hasert,
W Krenz,
D Lanske,
J G Morfín,
M Pohl,
H Weerts,
L Welch,
G H Bertrand-Coremans, [......],
M Jaffré,
L Jauneau,
C Longuemare,
A M Lutz,
C Pascaud,
J P Vialle,
F W Bullock,
T. W. Jones,
A G Michette,
G Myatt
[show abstract]
[hide abstract]
ABSTRACT: In addition to one previously reported event, a second event, in which a positron is observed together with a strange particle and a negative muon, has been seen in the bubble chamber Gargamelle exposed to the CERN neutrino beam. The level of the background for this type of event is found to be very low. The data strongly indicate the existence of a new type of interaction leading to a charged lepton pair correlated with a strange particle in the final state. The interpretation of these two events in terms of production of a charmed hadron is presented. (6 refs).
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J Blietschau,
J G Morfín,
M Pohl,
J Welch,
G H Bertrand-Coremans,
H Mulkens,
J Sacton,
W K Van Doninck,
C Matteuzzi,
F Romano, [......],
U Nguyen-Khac,
P van Dam,
S. Bonetti,
D Cavalli,
Antonio Pullia,
A M Lutz,
C Pascaud,
F W Bullock,
T. W. Jones,
A G Michette
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[show abstract]
[hide abstract]
ABSTRACT: We introduce and analyse the longitudinally polarized forward-backward asymmetry AFBpol for electron-positron annihilation on Z0 resonance. We show that a specific combination of data taken with two opposite electron polarizations is independent of the initial state details including one-loop electroweak and bremsstrahlung effects. This remarkable property would allow the weak coupling of the produced final state (μ, ρ, b, c, …) to be measured in a clean and very promising way at LEP/SLC.
Nuclear Physics B.
-
H. Deden,
F.J. Hasert,
W. Krenz,
D. Lanske,
J. Morfin,
M. Pohl,
K. Schultze,
L. Welch,
G. Bertrand-Coremans,
H. Mulkens, [......],
C. Longuemare,
A.M. Lutz,
C. Pascaud,
J.P. Vialle,
F.W. Bullock,
M.J. Esten,
T.W. Jones,
A.G. Michette,
G. Myatt,
A.J. Segar
[show abstract]
[hide abstract]
ABSTRACT: New results are presented of an analysis of pictures taken during an exposure of Gargamelle to the CERN ν beam in 1975. In addition to three νμ+N→μ−+e++V0+ hadrons events previously reported, an excess is found of events of the type νμ+N→μ−+e++ hadrons without V0. An analysis of strange particle production in charged current events suggests a possible violation of the ΔS=ΔQ rule. Interpreted in terms of charm production, the data permit an estimate of branching ratios and production rate of charmed particles. A limit is also placed on charmed particle production by neutral currents.
Physics Letters B.
-
M G Catanesi,
M T Muciaccia,
E Radicioni,
S Simone,
R Edgecock,
M. Ellis,
S Robbins,
F J P Soler,
C Gössling,
M Mass, [......],
G Giannini,
G. Santin,
Y. Hayato,
A Ichikawa,
T Kobayashi,
J Burguet-Castell,
J J Gómez-Cadenas,
P Novella,
M. Sorel,
A Tornero
[show abstract]
[hide abstract]
ABSTRACT: A precision measurement of the double-differential production cross-section, ${{d^2 \sigma^{\pi^+}}}/{{d p d\Omega}}$, for pions of positive charge, performed in the HARP experiment is presented. The incident particles are protons of 12.9 GeV/c momentum impinging on an aluminium target of 5% nuclear interaction length. The measurement of this cross-section has a direct application to the calculation of the neutrino flux of the K2K experiment. After cuts, 210000 secondary tracks reconstructed in the forward spectrometer were used in this analysis. The results are given for secondaries within a momentum range from 0.75 GeV/c to 6.5 GeV/c, and within an angular range from 30 mrad to 210 mrad. The absolute normalization was performed using prescaled beam triggers counting protons on target. The overall scale of the cross-section is known to better than 6%, while the average point-to-point error is 8.2%.
