26 research outputs found

    The Mu2e Crystal Calorimeter: An Overview

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    The Mu2e experiment at Fermilab will search for the standard model-forbidden, charged lepton flavour-violating conversion of a negative muon into an electron in the field of an aluminium nucleus. The distinctive signal signature is represented by a mono-energetic electron with an energy near the muon's rest mass. The experiment aims to improve the current single-event sensitivity by four orders of magnitude by means of a high-intensity pulsed muon beam and a high-precision tracking system. The electromagnetic calorimeter complements the tracker by providing high rejection power in muon to electron identification and a seed for track reconstruction while working in vacuum in presence of a 1 T axial magnetic field and in a harsh radiation environment. For 100 MeV electrons, the calorimeter should achieve: (a) a time resolution better than 0.5 ns, (b) an energy resolution <10%, and (c) a position resolution of 1 cm. The calorimeter design consists of two disks, each loaded with 674 undoped CsI crystals read out by two large-area arrays of UV-extended SiPMs and custom analogue and digital electronics. We describe here the status of construction for all calorimeter components and the performance measurements conducted on the large-sized prototype with electron beams and minimum ionizing particles at a cosmic ray test stand. A discussion of the calorimeter's engineering aspects and the on-going assembly is also reported

    Mu2e Crystal Calorimeter Readout Electronics: Design and Characterisation

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    The Mu2e experiment at Fermi National Accelerator Laboratory will search for the charged-lepton flavour-violating neutrinoless conversion of negative muons into electrons in the Coulomb field of an Al nucleus. The conversion electron with a monoenergetic 104.967 MeV signature will be identified by a complementary measurement carried out by a high-resolution tracker and an electromagnetic calorimeter, improving by four orders of magnitude the current single-event sensitivity. The calorimeter—composed of 1348 pure CsI crystals arranged in two annular disks—has a high granularity, 10% energy resolution and 500 ps timing resolution for 100 MeV electrons. The readout, based on large-area UV-extended SiPMs, features a fully custom readout chain, from the analogue front-end electronics to the digitisation boards. The readout electronics design was validated for operation in vacuum and under magnetic fields. An extensive radiation hardness certification campaign certified the FEE design for doses up to 100 krad and 1012 n1MeVeq/cm2 and for single-event effects. A final vertical slice test on the final readout chain was carried out with cosmic rays on a large-scale calorimeter prototype

    A New Charged Lepton Flavor Violation Program at Fermilab

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    The muon has played a central role in establishing the Standard Model of particle physics, and continues to provide valuable information about the nature of new physics. A new complex at Fermilab, the Advanced Muon Facility, would provide the world's most intense positive and negative muon beams by exploiting the full potential of PIP-II and the Booster upgrade. This facility would enable a broad muon physics program, including studies of charged lepton flavor violation, muonium-antimuonium transitions, a storage ring muon EDM experiment, and muon spin rotation experiments. This document describes a staged realization of this complex, together with a series of next-generation experiments to search for charged lepton flavor violation.Comment: A Contributed Paper for Snowmass 202

    Study of gamma-rays flux with AMS-02

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    This thesis is focused on the measurement of the Îł\gamma-rays flux in cosmic rays from 2 GeV up to 300 GeV with the \emph{Alpha Magnetic Spectrometer} (AMS-02) experiment

    Study of the calorimetric detection of the muon to electron conversion in the Mu2e experiment

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    The Mu2e experiment will search for Charged Lepton Flavor Violation (CLFV), looking at the coherent conversion of a muon into an electron in the field of an aluminum nucleus. The knowledge of such a CLFV reaction allows to indirectly probe new physics at energy scales up to thousands of TeV, inaccessible with direct searches at either present or planned high energy colliders. For this reason, Mu2e will measure the muon-to-electron conversion rate R_{\mu e} with an unprecedented accuracy, so to improve of a factor 10^4 the best current measurement and, in case of no observation, to constrain its value below 6 x 10^-17 at 90% of CL. To reach this ambitious sensitivity, about 10^18 muonic atom decays have to be observed: Mu2e is expected to use an intense pulsed muon beam, and rely on a detector system composed of a straw tube tracker and an electromagnetic calorimeter. The calorimeter is composed of 1348 un-doped CsI crystals, each coupled to two large area Silicon Photomultipliers (SiPMs). It plays a central role in the Mu2e measurement, providing particle identification capabilities that are necessary to reject the cosmic muons and antiprotons induced background. Moreover, the calorimeter has to help the tracker providing a seed for the pattern recognition and to provide a fast independ trigger. Having these experimental requests as pivotal reference, a set of Quality Assurance (QA) criteria for the calorimeter active components have been defined. Following the corresponding QA procedures, a first batch of crystals and photosensors has been characterized and used to assemble a medium scale prototype of the calorimeter (Module-0). The Module-0 has been studied by means of a 100 MeV electron beam, confirming that expected calorimeter performances well satisfy the Mu2e requirements

    Slow control and data acquisition development in the Mu2e experiment

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    The muon campus program at Fermilab includes the Mu2e experiment that will search for a charged-lepton flavor violating processes where a negative muon converts into an electron in the field of an aluminum nucleus, improving by four orders of magnitude the search sensitivity reached so far. Mu2e’s Trigger and Data Acquisition System (TDAQ) uses {it otsdaq} solution. Developed at Fermilab, {it otsdaq} uses the {it artdaq} DAQ framework and {it art} analysis framework, for event transfer, filtering, and processing. {it otsdaq} is an online DAQ software suite with a focus on flexibility and scalability, and provides a multi-user interface accessible through a web browser. A Detector Control System (DCS) for monitoring, controlling, alarming, and archiving has been developed using the Experimental Physics and Industrial Control System (EPICS) open source Platform. The DCS System has also been integrated into {it otsdaq}, providing a GUI multi-user, web-based control, and monitoring dashboard

    Online DAQ and slow control interface for the Mu2e experiment

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    The Mu2e experiment at the Fermilab Muon Campus will search for the coherent neutrinolessconversion of a muon into an electron in the field of an aluminum nucleus with a sensitivityimprovement by a factor of 10,000 over existing limits. The Mu2e Trigger and Data AcquisitionSystem (TDAQ) usesotsdaqas the online Data Acquisition System (DAQ) solution. Developed atFermilab,otsdaqintegrates both theartdaqDAQ and theartanalysis frameworks for event transfer,filtering, and processing.otsdaqis an online DAQ software suite with a focus on flexibility andscalability and provides a multi-user, web-based, interface accessible through a web browser. Thedata stream from the detector subsystems is read by a software filter algorithm that selects eventswhich are combined with the data flux coming from a Cosmic Ray Veto System. The DetectorControl System (DCS) has been developed using the Experimental Physics and Industrial ControlSystem (EPICS) open source platform for monitoring, controlling, alarming, and archiving. TheDCS System has been integrated intootsdaq. A prototype of the TDAQ and the DCS systems hasbeen built at Fermilab’s Feynman Computing Center. In this paper, we report on the progress ofthe integration of this prototype in the onlineotsdaqsoftware
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