A narrow band neutrino beam with high precision flux measurements

The ENUBET facility is a proposed narrow band neutrino beam where lepton production is monitored at single particle level in the instrumented decay tunnel. This facility addresses simultaneously the two most important challenges for the next generation of cross section experiments: a superior control of the flux and flavor composition at source and a high level of tunability and precision in the selection of the energy of the outcoming neutrinos. We report here the latest results in the development and test of the instrumentation for the decay tunnel. Special emphasis is given to irradiation tests of the photo-sensors performed at INFN-LNL and CERN in 2017 and to the first application of polysiloxane-based scintillators in high energy physics.Comment: Poster presented at NuPhys2017 (London, 20-22 December 2017). 5 pages, 2 figure

Shashlik calorimeters: Novel compact prototypes for the ENUBET experiment

We summarize in this paper the detector R&D performed in the framework of the ERC ENUBET Project. We discuss in particular the latest results on longitudinally segmented shashlik calorimeters and the first HEP application of polysiloxane-based scintillators

Longitudinally segmented shashlik calorimeters with SiPM embedded readout

Shashlik calorimeters are sampling calorimeters using wavelength shifting fibers running perpendicularly to the scintillating/absorber plates for the light readout. These devices are cost-effective, easy to assemble, and characterized by a good flexibility in terms of energy resolution. On the contrary, the perpendicular optical fiber readout and the resulting fiber bundling to the photosensor pose a strong limitation to the longitudinal segmentation. Recently, the fast development of solid state photosensors allowed for the integration of the readout system directly in the bulk of the calorimeter, opening new possibilities in terms of longitudinal segmentation (SCENTT INFN R D). In an ultra-compact module every single fiber segment is directly connected to a SiPM; the SiPMs are arranged in arrays on custom PCBs and readout by a fast electronics based on waveform digitizers. This detector technology is the baseline option for ENUBET: a 5 year project (2016-2021) funded by the European Research Council aiming to demonstrate the possibility of a complete instrumentation of the decay tunnel of conventional neutrino beam. This technique allows for a ten-fold reduction on the neutrino flux normalization error. In the talk we will present the results and a detailed performance assessment of the novel ultra-compact design obtained with a prototype of longitudinally segmented shashlik calorimeter, readout with SiPMs embedded in the calorimeter bulk. Tests performed at the CERN PST9 beamline in the 1-5 GeV energy range in November 2016 provided results in terms of linearity, energy resolution and e/\pi discrimination at various beam angles reproducing the grazing incident conditions typical of neutrino beam decay tunnels. We will also present results from a neutron irradiation campaign of our Silicon Photomultipliers at the INFN-LNL CN accelerator allowing to test neutron fluences of O(10^12/cm^2) using 5 MeV protons on a Be target

Positron identification in the ENUBET instrumented decay tunnel

The ERC granted ENUBET project aims at developing the technologies to reduce by a factor $\sim$10 the systematics in neutrino fluxes from conventional beams, allowing measuring the $\nu_e$ (and $\overline{\nu}_e$) cross section with a 1% precision, in the region of interest for future oscillation experiments looking for CP violation. This goal is accomplished by monitoring in an instrumented decay tunnel the high angle positron produced in K$_{e3}$ decays of charged kaons, in a sign and momentum selected narrow band beam. After a brief description of the proposed facility, the Monte Carlo simulation of the positron tagger in realistic conditions and a preliminary event reconstruction chain will be described, together with results on the expected signal selection efficiency

Shashlik calorimeters: Novel compact prototypes for the ENUBET experiment

We summarize in this paper the detector R&D performed in the framework of the ERC ENUBET Project. We discuss in particular the latest results on longitudinally segmented shashlik calorimeters and the first HEP application of polysiloxane-based scintillators

Fibrous dysplasia of Sphenoid bone

International audienceThe ENUBET Collaboration is developing a technology to reduce by one order of magnitude the uncertainty on fluxes in conventional neutrino beam. The ENUBET beamline exploits the large angle production of positrons from $K^+ \rightarrow e^+ \pi^0 \nu_e$ in the decay tunnel to monitor the associated production of $\nu_e$. This method provides the $\nu_e$ rate at source at the 1% level. In this talk, we will summarize the results during the first year of the project and plans up to completion (2021)

Shashlik calorimeters for the ENUBET tagged neutrino beam

Shashlik calorimeters equipped with a compact readout based on Silicon PhotoMultipliers can be longitudinally segmented by directly coupling the WLS fibers with the photosensors thus embedding the readout in the bulk of the calorimeter. Results on energy resolution and particle identification for such calorimeters are presented. The SiPMs for the readout have also been characterized after being exposed to neutron fluences up to 2×10$^{11}$ n/cm$^2$ (1 MeV eq.). Alternative options for the active material were also investigated; we studied in particular polysiloxane as a substitute for plastic scintillator

Testbeam performance of a shashlik calorimeter with fine-grained longitudinal segmentation

An iron- plastic-scintillator shashlik calorimeter with a 4.3 X0 longitudinal segmentation was tested in November 2016 at the CERN East Area facility with charged particles up to 5 GeV . The performance of this detector in terms of electron energy resolution, linearity, response to muons and hadron showers are presented in this paper and compared with simulation. Such a fine-grained longitudinal segmentation is achieved using a very compact light readout system developed by the SCENTT and ENUBET Collaborations, which is based on fiber-SiPM coupling boards embedded in the bulk of the detector. We demonstrate that this system fulfills the requirements for neutrino physics applications and discuss performance and additional improvements