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 its map. Spatial resolution better than 600 μm and energy resolution better than 9% are obtained for all incident angles. These performances fulfil the requirements for the upgrade of the ND280 TPC.
Polysiloxane-based scintillators for shashlik calorimeters Acerbi, F.; Branca, A.; Brizzolari, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2020, Letnik:
956
Journal Article
Recenzirano
Odprti dostop
We present the first application of polysiloxane-based scintillators as active medium in a shashlik sampling calorimeter. These results were obtained from a testbeam campaign of a ∼6×6×45 cm3 (13 X0 ...depth) prototype. A Wavelength Shifting fiber array of 36 elements runs perpendicularly to the stack of iron (15 mm) and polysiloxane scintillator (15 mm) tiles with a density of about one over cm2. Unlike shashlik calorimeters based on plastic organic scintillators, here fibers are optically matched with the scintillator without any intermediate air gap. The prototype features a compact light readout based on Silicon Photo-Multipliers embedded in the bulk of the detector. The detector was tested with electrons, pions and muons with energies ranging from 1 to 7 GeV at the CERN-PS. This solution offers a highly radiation hard detector to instrument the decay region of a neutrino beam, providing an event-by-event measurement of high-angle decay products associated with neutrino production (ENUBET, Enhanced NeUtrino BEams from kaon Tagging, ERC project). The results in terms of light yield, uniformity and energy resolution, are compared to a similar calorimeter built with ordinary plastic scintillators.
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.
•A compact shashlik-type calorimeter has been developed for neutrino beams.•Test beam performances at 1–5 GeV energy range validated the detector requirements.•The calorimeter was irradiated up to 1011 neutrons/cm2 and successfully operated.•We developed and tested several prototypes based on polysiloxane scintillators.
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 2×1011 n/cm2 (1 MeV eq.). Alternative options for the active material were also investigated; we studied in particular polysiloxane as a substitute for plastic scintillator.
Status of the ENUBET project Ballerini, G; Berra, A; Boanta, R ...
Journal of physics. Conference series,
07/2018, Letnik:
1056, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The next generation of neutrino experiments requires measurements of absolute neutrino cross sections at the GeV scale with high precision (∼1%) presently limited by the uncertainties on neutrino ...flux. Monitoring the lepton production in the decay tunnel of neutrino beams is the most straightforward way to measure the neutrino flux at source. The ENUBET Collaboration develops novel technologies to monitor positrons from K+ → νee+π0 decays on an event by event basis. This technique can achieve a precision in the νe flux below 1% and enable a new generation of cross section and short baseline experiments. In this paper, we present the achievements of the first year of the Project on beamline simulation, rate and dose assessment, detector prototyping and evaluation of the physics reach.
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.
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