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Construction, commissioning, and performance of the ENUBET demonstrator
Authors:
F. Acerbi,
I. Angelis,
L. Bomben,
M. Bonesini,
F. Bramati,
A. Branca,
C. Brizzolari,
G. Brunetti,
G. T. Burton,
S. Capelli,
M. Capitani,
S. Carturan,
M. G. Catanesi,
S. Cecchini,
N. Charitonidis,
F. Cindolo,
J. Cogan,
G. Cogo,
G. Collazuol,
D. D'Ago,
F. Dal Corso,
C. Delogu,
G. De Rosa,
S. Dolan,
A. Falcone
, et al. (52 additional authors not shown)
Abstract:
A final full-size prototype of the instrumented decay tunnel of ENUBET, referred to as the Demonstrator, was constructed and its performance was tested during the 2022, 2023 and 2024 beam test campaigns at the CERN East Area facility. We demonstrate the full scalability of this specialized longitudinal sampling calorimeter technology, based on iron absorbers and scintillator tiles readout by wavel…
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A final full-size prototype of the instrumented decay tunnel of ENUBET, referred to as the Demonstrator, was constructed and its performance was tested during the 2022, 2023 and 2024 beam test campaigns at the CERN East Area facility. We demonstrate the full scalability of this specialized longitudinal sampling calorimeter technology, based on iron absorbers and scintillator tiles readout by wavelength-shifting fibers and SiPMs. In addition, we evaluate the channel-by- channel response and the performance in terms of electron energy resolution, linearity, and particle identification capabilities, using charged particle beams with energies up to 5 GeV. A comparison with the predictions of a GEANT4 simulation of the prototype is also presented. The results meet the requirements for neutrino monitoring through lepton identification in the decay tunnel and validate the ENUBET full simulation. Although some limitations have been identified, they can be readily addressed in future developments.
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Submitted 3 August, 2026;
originally announced August 2026.
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Performance of the High-Angle Time Projection Chambers in the Upgraded T2K Off-Axis Near Detector
Authors:
K. Aivazelis,
D. Attié,
P. Billoir,
A. Blanchet,
G. Bortolato,
S. Bolognesi,
R. Boullon,
N. F. Calabria,
D. Calvet,
M. P. Casado,
M. G. Catanesi,
M. Cicerchia,
G. Cogo,
G. Collazuol,
P. Colas,
D. Cotte,
D. D'Ago,
C. Dalmazzone,
T. Daret,
R. de Oliveira,
A. Delbart,
J. Dumarchez,
K. Dygnarowicz,
S. Emery-Schrenk,
A. Ershova
, et al. (72 additional authors not shown)
Abstract:
The off-axis magnetic near detector of the T2K experiment has undergone a significant upgrade, including the construction and installation of two new Time Projection Chambers featuring innovative resistive Micromegas technology and a field cage composed of thin composite walls. This paper provides a detailed description of the new components of the chambers, including the gas system, gas monitorin…
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The off-axis magnetic near detector of the T2K experiment has undergone a significant upgrade, including the construction and installation of two new Time Projection Chambers featuring innovative resistive Micromegas technology and a field cage composed of thin composite walls. This paper provides a detailed description of the new components of the chambers, including the gas system, gas monitoring chambers, and data acquisition system. Additionally, it reports the results of extensive testing using both neutrino beams and cosmic rays, with comparisons between data and Monte Carlo simulations. The new detectors achieve improved spatial resolution and enhanced particle identification capabilities which are crucial for the precision goals of the T2K experiment.
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Submitted 23 November, 2025;
originally announced November 2025.
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nuSCOPE: A short-baseline neutrino beam at CERN for high-precision cross-section measurements
Authors:
F. Acerbi,
C. Andreopoulos,
I. Angelis,
A. Baratto Roldan,
L. Bomben,
M. Bonesini,
F. Bramati,
A. Branca,
C. Brizzolari,
G. Brunetti,
M. Buizza Avanzini,
S. Capelli,
M. Capitani,
S. Carturan,
M. G. Catanesi,
S. Cecchini,
N. Charitonidis,
F. Cindolo,
J. Cogan,
G. Cogo,
G. Collazuol,
D. D'Ago,
F. Dal Corso,
G. De Rosa,
S. Dolan
, et al. (59 additional authors not shown)
Abstract:
A new generation of neutrino cross-section experiments at the GeV scale is crucial in the precision era of oscillation physics and lepton flavor studies. In this document, we present a novel neutrino beam design that leverages the experience and R&D achievements of the NP06/ENUBET and NuTag Collaborations and explore its potential implementation at CERN. This beam enables flux monitoring at the pe…
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A new generation of neutrino cross-section experiments at the GeV scale is crucial in the precision era of oscillation physics and lepton flavor studies. In this document, we present a novel neutrino beam design that leverages the experience and R&D achievements of the NP06/ENUBET and NuTag Collaborations and explore its potential implementation at CERN. This beam enables flux monitoring at the percent level and provides a neutrino energy measurement independent of final state particle reconstruction at the neutrino detector. As a result, it eliminates the two primary sources of systematic uncertainty in cross-section measurements: flux normalization and energy bias caused by nuclear effects. We provide a detailed description of the beam technology and instrumentation, along with an overview of its physics potential, with particular emphasis on cross-sections relevant to DUNE and Hyper-Kamiokande.
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Submitted 19 June, 2025; v1 submitted 27 March, 2025;
originally announced March 2025.
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The ENUBET monitored neutrino beam and its implementation at CERN
Authors:
ENUBET collaboration,
L. Halić,
F. Acerbi,
I. Angelis,
L. Bomben,
M. Bonesini,
F. Bramati,
A. Branca,
C. Brizzolari,
G. Brunetti,
M. Calviani,
S. Capelli,
M. Capitani,
S. Carturan,
M. G. Catanesi,
S. Cecchini,
N. Charitonidis,
F. Cindolo,
G. Cogo,
G. Collazuol,
F. Dal Corso,
C. Delogu,
G. De Rosa,
A. Falcone,
B. Goddard
, et al. (52 additional authors not shown)
Abstract:
The ENUBET project recently concluded the R&D for a site independent design of a monitored neutrino beam for high precision cross section measurements, in which the neutrino flux is inferred from the measurement of charged leptons in an instrumented decay tunnel. In this phase three fundamental results were obtained and will be discussed here: 1) a beamline not requiring a horn and relying on stat…
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The ENUBET project recently concluded the R&D for a site independent design of a monitored neutrino beam for high precision cross section measurements, in which the neutrino flux is inferred from the measurement of charged leptons in an instrumented decay tunnel. In this phase three fundamental results were obtained and will be discussed here: 1) a beamline not requiring a horn and relying on static focusing elements allows to perform a $ν_e$ cross section measurement in the DUNE energy range with 1% statistical uncertainty employing $10^{20}$ 400 GeV protons on target (pot) and a neutrino detector of the size of ProtoDUNE; 2) the instrumentation of the decay tunnel, based on a cost effective sampling calorimeter solution, has been tested with a large scale prototype achieving the performance required to identify positrons and muons from kaon decays with high signal-to-noise ratio; 3) the systematics budget on the neutrino flux is constrained at the 1% level by fitting the charged leptons observables measured in the decay tunnel. Based on these successful results ENUBET is now pursuing a study for a site dependent implementation at CERN in the framework of Physics Beyond Colliders. In this context a new beamline, able to enrich the neutrino flux at the energy of HK and to reduce by more than a factor 3 the needed pot, has been designed and is being optimized. The civil engineering and radioprotection studies for the siting of ENUBET in the North Area towards the two ProtoDUNEs are also in the scope of this work, with the goal of proposing a neutrino cross section experiment in 2026. The combined use of both the neutrino detectors and of the improved beamline would allow to perform cross section measurements with unprecedented precision in about 5 years with a proton request compatible with the needs of other users after CERN Long Shutdown 3.
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Submitted 8 January, 2025;
originally announced January 2025.
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Design and performance of the ENUBET monitored neutrino beam
Authors:
F. Acerbi,
I. Angelis,
L. Bomben,
M. Bonesini,
F. Bramati,
A. Branca,
C. Brizzolari,
G. Brunetti,
M. Calviani,
S. Capelli,
S. Carturan,
M. G. Catanesi,
S. Cecchini,
N. Charitonidis,
F. Cindolo,
G. Cogo,
G. Collazuol,
F. Dal Corso,
C. Delogu,
G. De Rosa,
A. Falcone,
B. Goddard,
A. Gola,
D. Guffanti,
L. Halić
, et al. (47 additional authors not shown)
Abstract:
The ENUBET project is aimed at designing and experimentally demonstrating the concept of monitored neutrino beams. These novel beams are enhanced by an instrumented decay tunnel, whose detectors reconstruct large-angle charged leptons produced in the tunnel and give a direct estimate of the neutrino flux at the source. These facilities are thus the ideal tool for high-precision neutrino cross-sect…
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The ENUBET project is aimed at designing and experimentally demonstrating the concept of monitored neutrino beams. These novel beams are enhanced by an instrumented decay tunnel, whose detectors reconstruct large-angle charged leptons produced in the tunnel and give a direct estimate of the neutrino flux at the source. These facilities are thus the ideal tool for high-precision neutrino cross-section measurements at the GeV scale because they offer superior control of beam systematics with respect to existing facilities. In this paper, we present the first end-to-end design of a monitored neutrino beam capable of monitoring lepton production at the single particle level. This goal is achieved by a new focusing system without magnetic horns, a 20 m normal-conducting transfer line for charge and momentum selection, and a 40 m tunnel instrumented with cost-effective particle detectors. Employing such a design, we show that percent precision in cross-section measurements can be achieved at the CERN SPS complex with existing neutrino detectors.
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Submitted 18 August, 2023;
originally announced August 2023.
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Characterization of Charge Spreading and Gain of Encapsulated Resistive Micromegas Detectors for the Upgrade of the T2K Near Detector Time Projection Chambers
Authors:
D. Attie,
O. Ballester,
M. Batkiewicz-Kwasnia,
P. Billoir,
A. Blondel,
S. Bolognesi,
R. Boullon,
D. Calvet,
M. P. Casado,
M. G. Catanesi,
M. Cicerchia,
G. Cogo,
P. Colas,
G. Collazuol,
D. D Ago,
C. Dalmazzon,
T. Daret,
A. Delbart,
A. De Lorenzis,
R. de Oliveira,
S. Dolan,
K. Dygnarowiczi,
J. Dumarchez,
S. Emery-Schren,
A. Ershova
, et al. (70 additional authors not shown)
Abstract:
An upgrade of the near detector of the T2K long baseline neutrino oscillation experiment is currently being conducted. This upgrade will include two new Time Projection Chambers, each equipped with 16 charge readout resistive Micromegas modules. A procedure to validate the performance of the detectors at different stages of production has been developed and implemented to ensure a proper and relia…
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An upgrade of the near detector of the T2K long baseline neutrino oscillation experiment is currently being conducted. This upgrade will include two new Time Projection Chambers, each equipped with 16 charge readout resistive Micromegas modules. A procedure to validate the performance of the detectors at different stages of production has been developed and implemented to ensure a proper and reliable operation of the detectors once installed. A dedicated X-ray test bench is used to characterize the detectors by scanning each pad individually and to precisely measure the uniformity of the gain and the deposited energy resolution over the pad plane. An energy resolution of about 10% is obtained. A detailed physical model has been developed to describe the charge dispersion phenomena in the resistive Micromegas anode. The detailed physical description includes initial ionization, electron drift, diffusion effects and the readout electronics effects. The model provides an excellent characterization of the charge spreading of the experimental measurements and allowed the simultaneous extraction of gain and RC information of the modules.
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Submitted 8 March, 2023;
originally announced March 2023.
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Analysis of test beam data taken with a prototype of TPC with resistive Micromegas for the T2K Near Detector upgrade
Authors:
D. Attié,
O. Ballester,
M. Batkiewicz-Kwasniak,
P. Billoir,
A. Blanchet,
A. Blondel,
S. Bolognesi,
R. Boullon,
D. Calvet,
M. P. Casado,
M. G. Catanesi,
M. Cicerchia,
G. Cogo,
P. Colas,
G. Collazuol,
C. Dalmazzone,
T. Daret,
A. Delbart,
A. De Lorenzis,
S. Dolan,
K. Dygnarowicz,
J. Dumarchez,
S. Emery-Schrenk,
A. Ershova,
G. Eurin
, et al. (59 additional authors not shown)
Abstract:
In this paper we describe the performance of a prototype of the High Angle Time Projection Chambers (HA-TPCs) that are being produced for the Near Detector (ND280) upgrade of the T2K experiment. The two HA-TPCs of ND280 will be instrumented with eight Encapsulated Resistive Anode Micromegas (ERAM) on each endplate, thus constituting in total 32 ERAMs. This innovative technique allows the detection…
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In this paper we describe the performance of a prototype of the High Angle Time Projection Chambers (HA-TPCs) that are being produced for the Near Detector (ND280) upgrade of the T2K experiment. The two HA-TPCs of ND280 will be instrumented with eight Encapsulated Resistive Anode Micromegas (ERAM) on each endplate, thus constituting in total 32 ERAMs. This innovative technique allows the detection of the charge emitted by ionization electrons over several pads, improving the determination of the track position. The TPC prototype has been equipped with the first ERAM module produced for T2K and with the HA-TPC readout electronics chain and it has been exposed to the DESY Test Beam in order to measure spatial and dE/dx resolution. In this paper we characterize the performances of the ERAM and, for the first time, we compare them with a newly developed simulation of the detector response. Spatial resolution better than 800 ${μ\rm m}$ and dE/dx resolution better than 10% are observed for all the incident angles and for all the drift distances of interest. All the main features of the data are correctly reproduced by the simulation and these performances fully fulfill the requirements for the HA-TPCs of T2K.
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Submitted 16 May, 2023; v1 submitted 13 December, 2022;
originally announced December 2022.
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Characterization of resistive Micromegas detectors for the upgrade of the T2K Near Detector Time Projection Chambers
Authors:
D. Attié,
M. Batkiewicz-Kwasniak,
P. Billoir,
A. Blanchet,
A. Blondel,
S. Bolognesi,
D. Calvet,
M. G. Catanesi,
M. Cicerchia,
G. Cogo,
P. Colas,
G. Collazuol,
A. Delbart,
J. Dumarchez,
S. Emery-Schrenk,
M. Feltre,
C. Giganti,
F. Gramegna,
M. Grassi,
M. Guigue,
P. Hamacher-Baumann,
S. Hassani,
F. Iacob,
C. Jesús-Valls,
R. Kurjata
, et al. (36 additional authors not shown)
Abstract:
The second phase of the T2K experiment is expected to start data taking in autumn 2022. An upgrade of the Near Detector (ND280) is under development and includes the construction of two new Time Projection Chambers called High-Angle TPC (HA-TPC). The two endplates of these TPCs will be paved with eight Micromegas type charge readout modules. The Micromegas detector charge amplification structure u…
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The second phase of the T2K experiment is expected to start data taking in autumn 2022. An upgrade of the Near Detector (ND280) is under development and includes the construction of two new Time Projection Chambers called High-Angle TPC (HA-TPC). The two endplates of these TPCs will be paved with eight Micromegas type charge readout modules. The Micromegas detector charge amplification structure uses a resistive anode to spread the charges over several pads to improve the space point resolution. This innovative technique is combined with the bulk-Micromegas technology to compose the "Encapsulated Resistive Anode Micromegas" detector. A prototype has been designed, built and exposed to an electron beam at the DESY II test beam facility.
The data have been used to characterize the charge spreading and to produce a RC map. Spatial resolution better than 600 $μ$m and energy resolution better than 9% are obtained for all incident angles. These performances fulfil the requirements for the upgrade of the ND280 TPC.
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Submitted 23 June, 2021;
originally announced June 2021.
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J-PARC Neutrino Beamline Upgrade Technical Design Report
Authors:
K. Abe,
H. Aihara,
A. Ajmi,
C. Alt,
C. Andreopoulos,
M. Antonova,
S. Aoki,
Y. Asada,
Y. Ashida,
A. Atherton,
E. Atkin,
S. Ban,
F. C. T. Barbato,
M. Barbi,
G. J. Barker,
G. Barr,
M. Batkiewicz,
A. Beloshapkin,
V. Berardi,
L. Berns,
S. Bhadra,
J. Bian,
S. Bienstock,
A. Blondel,
S. Bolognesi
, et al. (360 additional authors not shown)
Abstract:
In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data corresponding to $2\times{}10^{22}$ protons-on-target in the next decade, aiming at an initial observation of CP violation with $3σ$ or higher significance in the case of maximal CP violation. Methods to increase the neut…
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In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data corresponding to $2\times{}10^{22}$ protons-on-target in the next decade, aiming at an initial observation of CP violation with $3σ$ or higher significance in the case of maximal CP violation. Methods to increase the neutrino beam intensity, which are necessary to achieve the proposed data increase, are described.
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Submitted 14 August, 2019;
originally announced August 2019.
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Performances of a resistive MicroMegas module for the Time Projection Chambers of the T2K Near Detector upgrade
Authors:
D. Attie,
M. Batkiewicz-Kwasniak,
J. Boix,
S. Bolognesi,
S. Bordoni,
D. Calvet,
M. G. Catanesi,
M. Cicerchia,
G. Cogo,
P. Colas,
G. Collazuol,
A. Dabrowska,
A. Delbart,
J. Dumarchez,
S. Emery-Schrenk,
C. Giganti,
F. Gramegna,
M. Guigue,
P. Hamacher-Baumann,
F. Iacob,
C. Jesus-Valls,
U. Kosed,
R. Kurjataj,
N. Lacalamita,
M. Lamoureux
, et al. (31 additional authors not shown)
Abstract:
An upgrade of the Near Detector of the T2K long baseline neutrino oscillation experiment, ND280, has been proposed. This upgrade will include two new Time Projection Chambers, each equipped with 16 resistive MicroMegas modules for gas amplification. A first prototype of resistive MicroMegas has been designed, built, installed in the HARP field cage, and exposed to a beam of charged particles at CE…
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An upgrade of the Near Detector of the T2K long baseline neutrino oscillation experiment, ND280, has been proposed. This upgrade will include two new Time Projection Chambers, each equipped with 16 resistive MicroMegas modules for gas amplification. A first prototype of resistive MicroMegas has been designed, built, installed in the HARP field cage, and exposed to a beam of charged particles at CERN. The data have been used to characterize the performances of the resistive MicroMegas module. A spatial resolution of 300 $μm$ and a deposited energy resolution of 9% were observed for horizontal electrons crossing the TPCs at 30 cm from the anode. Such performances fully satisfy the requirements for the upgrade of the ND280 TPC.
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Submitted 9 December, 2019; v1 submitted 16 July, 2019;
originally announced July 2019.
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T2K ND280 Upgrade -- Technical Design Report
Authors:
K. Abe,
H. Aihara,
A. Ajmi,
C. Andreopoulos,
M. Antonova,
S. Aoki,
Y. Asada,
Y. Ashida,
A. Atherton,
E. Atkin,
D. Attié,
S. Ban,
M. Barbi,
G. J. Barker,
G. Barr,
M. Batkiewicz,
A. Beloshapkin,
V. Berardi,
L. Berns,
S. Bhadra,
J. Bian,
S. Bienstock,
A. Blondel,
J. Boix,
S. Bolognesi
, et al. (359 additional authors not shown)
Abstract:
In this document, we present the Technical Design Report of the Upgrade of the T2K Near Detector ND280. The goal of this upgrade is to improve the Near Detector performance to measure the neutrino interaction rate and to constrain the neutrino interaction cross-sections so that the uncertainty in the number of predicted events at Super-Kamiokande is reduced to about 4%. This will allow to improve…
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In this document, we present the Technical Design Report of the Upgrade of the T2K Near Detector ND280. The goal of this upgrade is to improve the Near Detector performance to measure the neutrino interaction rate and to constrain the neutrino interaction cross-sections so that the uncertainty in the number of predicted events at Super-Kamiokande is reduced to about 4%. This will allow to improve the physics reach of the T2K-II project. This goal is achieved by modifying the upstream part of the detector, adding a new highly granular scintillator detector (Super-FGD), two new TPCs (High-Angle TPC) and six TOF planes. Details about the detector concepts, design and construction methods are presented, as well as a first look at the test-beam data taken in Summer 2018. An update of the physics studies is also presented.
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Submitted 14 October, 2020; v1 submitted 11 January, 2019;
originally announced January 2019.