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
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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.
Neutrino neutral-current (NC) induced single photon production is a sub-leading order process for accelerator-based neutrino beam experiments including T2K. It is, however, an important process to ...understand because it is a background for electron (anti)neutrino appearance oscillation experiments. Here, we performed the first search of this process below 1 GeV using the fine-grained detector at the T2K ND280 off-axis near detector. By reconstructing single photon kinematics from electron-positron pairs, we achieved 95% pure gamma ray sample from 5.738 × 10 20 protons-on-targets neutrino mode data. We do not find positive evidence of NC induced single photon production in this sample. We set the model-dependent upper limit on the cross-section for this process, at 0.114 × 10 − 38 cm2 (90% C.L.) per nucleon, using the J-PARC off-axis neutrino beam with an average energy of E ∼ 0.6 GeV. This is the first limit on this process below 1 GeV which is important for current and future oscillation experiments looking for electron neutrino appearance oscillation signals.
Precise knowledge of the beam optics at the LHC is crucial to fulfill the physics goals of the TOTEM experiment, where the kinematics of the scattered protons is reconstructed with near-beam ...telescopes-so-called Roman pots (RP). Before being detected, the protons' trajectories are influenced by the magnetic fields of the accelerator lattice. Thus precise understanding of the proton transport is of key importance for the experiment. A novel method of optics evaluation is proposed which exploits kinematical distributions of elastically scattered protons observed in the RPs. Theoretical predictions, as well as Monte Carlo studies, show that the residual uncertainty of the optics estimation method is smaller than .
Hadron production (HARP) is a high-statistics, full solid angle experiment to measure hadron production using proton and pion beams with momenta between 3 and 15 GeV/c impinging on many solid and ...liquid targets. Due to the experimental requirements, the time projection chamber (TPC) has been designed to provide full solid-angle acceptance and to be able to sustain a high event rate. The calibration strategy is based on the redundancy of a large spectrum of characterization methods. The specificity of the HARP TPC design, the calibration methods and results, and the present knowledge of detector performances will be reported
Results from the HARP experiment Radicioni, E
Journal of physics. Conference series,
07/2008, Letnik:
120, Številka:
5
Journal Article
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Hadron production is a key ingredient for precise prediction of atmospheric ν fluxes, characterization of accelerator ν beams, and quantification of π production and capture for ν-factory designs. ...HARP at the CERN PS was the first hadron production experiment designed on purpose to match all these requirements. We briefly describe here its most recent results.
TOTEM Roman Pot (RP) microstrip edgeless silicon detectors, fabricated with standard planar technology, reach full sensitivity within 50
μm from the cut edge and can operate with high bias voltage at ...room temperature. These detectors use a newly developed terminating structure, which prevents breakdown and surface current injection at high bias, while simultaneously providing extremely reduced dead zones at the edges. Moreover, radiation hardness studies indicate that when operated under moderate cooling, the detectors remain fully efficient up to a fluence of about 1.5×10
14
p
cm
−2. The mass production of these detectors for the TOTEM Experiment is being completed and their installation in the Roman Pots is ongoing. When the installation is complete and the LHC will be operational, these detectors will allow the TOTEM Experiment to detect leading protons at distance of ∼1
mm from the beam centre at the LHC. This work presented here is a survey of this recently developed device and its most up-to-date characterisations.
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