Design and status of the Mu2e crystal calorimeter

Atanov, N.; Баранов, В. А.; Bloise, C.; Budagov, J.; Cervelli, F.; Ceravolo, S.; Colao, F.; Cordelli, M.; Corradi, G.; Davydov, Yu. I.; Falco, S. Di; Diociaiuti, E.; Donati, S.; Donghia, R.; Echenard, B.; Ferrari, C.; Giovannella, S.; Glagolev, V.; Grancagnolo, F.; Hampai, D.; Happacher, F.; Hitlin, D. G.; Martini, M.; Miscetti, S.; Miyashita, T. S.; Morescalchi, L.; Murat, P.; Pasciuto, D.; Pedreschi, E.; Pezzullo, Gianantonio; Porter, F. C.; Raffaelli, F.; Saputi, A.; Sarra, I.; Spinella, F.; Tassielli, G.; Терещенко, В.; Usubov, Z.; Vasilyev, I. I.; Zanetti, A.; Zhu, R. Y.

doi:10.1016/j.nima.2019.04.094

Cited by 6 publications

(10 citation statements)

References 4 publications

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“…The main detectors employed by Mu2e are a straw-tube tracker [13] and an electromagnetic calorimeter [2,14] located inside a large superconducting solenoid which generates an axial magnetic field of 1 T. The main calorimeter function is providing complementary information to the tracker to achieve a powerful 𝜇/e separation which is crucial to extract the conversion electron signal from the expected overwhelming background. The calorimeter is also exploited in a calorimeter-seeded track finder algorithm which improves track reconstruction efficiency and makes the algorithm more robust in high detector occupancy conditions.…”

Section: The Mu2e Calorimetermentioning

confidence: 99%

Development, construction and tests of the Mu2e electromagnetic calorimeter mechanical structures

Atanov¹,

Баранов²,

Borrel³

et al. 2022

J. Inst.

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The “muon-to-electron conversion” (Mu2e) experiment at Fermilab will search for the charged lepton flavour violating neutrino-less coherent conversion of a muon into an electron in the field of an aluminum nucleus. The observation of this process would be the unambiguous evidence of the existence of physics beyond the standard model. Mu2e detectors comprise a straw-tracker, an electromagnetic calorimeter and an external veto for cosmic rays. In particular, the calorimeter provides excellent electron identification, a fast calorimetric online trigger, and complementary information to aid pattern recognition and track reconstruction. The detector has been designed as a state-of-the-art crystal calorimeter and employs 1348 pure Cesium Iodide (CsI) crystals readout by UV-extended silicon photosensors and fast front-end and digitization electronics. A design consisting of two identical annular matrices (named “disks”) positioned at the relative distance of 70 cm downstream the aluminum target along the muon beamline satisfies the Mu2e physics requirements. The hostile Mu2e operational conditions, in terms of radiation levels (total expected ionizing dose of 12 krad and a neutron fluence of 5 × 1010 n/cm2 @ 1 MeVeq (Si)/y), magnetic field intensity (1 T) and vacuum level (10−4 Torr) have posed tight constraints on scintillating materials, sensors, electronics and on the design of the detector mechanical structures and material choice. The support structure of each 674 crystal matrix is composed of an aluminum hollow ring and parts made of open-cell vacuum-compatible carbon fiber. The photosensors and front-end electronics for the readout of each crystal are inserted in a machined copper holder and make a unique mechanical unit. The resulting 674 mechanical units are supported by a machined plate of vacuum-compatible plastic material. The plate also integrates the cooling system made of a network of copper lines flowing a low temperature radiation-hard fluid and placed in thermal contact with the copper holders to constitute a low resistance thermal bridge. The data acquisition electronics are hosted in aluminum custom crates positioned on the external lateral surface of the disks. The crates also integrate the electronics cooling system as lines running in parallel to the front-end system. In this paper we report on the calorimeter mechanical structure design, the mechanical and thermal simulations that have determined the design technological choices, and the status of component production, quality assurance tests and plans for assembly at Fermilab.

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Section: The Mu2e Calorimetermentioning

confidence: 99%

Development, construction and tests of the Mu2e electromagnetic calorimeter mechanical structures

Atanov¹,

Баранов²,

Borrel³

et al. 2022

J. Inst.

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“…Similarly, the EM Calorimeter already finished testing a prototype made of 51 CsI crystals and the associated readout. The protoype module was able to achieve 5% energy resolution [5] as shown in Figure 7. Production of CsI crystals is complete and they are planned to be assembled into the disks soon.…”

Section: Progressmentioning

confidence: 99%

Muon to electron conversion search in the presence of Al nuclei at the Fermilab Mu2e experiment: Motivation, Design and Progress

Yücel¹

2021

Proceedings of 40th International Conference on High Energy Physics — PoS(ICHEP2020)

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The Mu2e experiment aims to find charged lepton flavor violation(CLFV) by measuring the monochromatic electrons from µ − N → e − N conversion with an unprecedented single event sensitivity of 3 × 10 −17. When completed, the experiment will improve the current limit by four orders of magnitude and make a previously unexplored phase space available for the search for beyond the standard model physics. Physics motivation for the experiment is discussed and design choices for the detectors and various sub systems are explained in this document. The construction of the Mu2e experiment is well underway and commissioning will begin in late 2022 with first data taking in late 2025 and 4-5 years of data taking thereafter to reach our goal.

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“…ECAUSE of its fast cross-luminescence [1][2][3][4][5][6][7] peaked at 220 nm with decay time of less than 0.6 ns [8][9][10][11][12][13][14][15] barium fluoride (BaF2) crystals have attracted a broad interest in the community pursuing ultrafast calorimetry for future high energy and nuclear physics experiments [14,19] and for GHz hard x-ray imaging for future X-ray Free Electron Laser (XFEL) facilities [9,13]. One crucial issue preventing BaF2 application is its slow scintillation component peaked at 300 nm due to self-trapped excitons with decay time of 600 ns and an intensity of more than five times of the fast component, which causes pileup and readout noise in a high-rate environment.…”

Section: Introductionmentioning

confidence: 99%

“…A BaF2 crystal calorimeter was baselined for the Mu2e experiment [14] and was replaced by an undoped CsI crystal calorimeter mainly due to this slow component [15]. It is also well known that undoped CsI survives the Mu2e radiation environment where an ionization dose up to a few tens krad but not a few hundred krad expected by Mu2e-II.…”

Section: Introductionmentioning

confidence: 99%

Spectral Response of UV Photodetectors for Barium Fluoride Crystal Readout

Zhang

Echenard

et al. 2022

IEEE Trans. Nucl. Sci.

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Because of its fast scintillation peaked at 220 nm with decay time of less than 0.6 ns barium fluoride crystals have attracted a broad interest in the community pursuing ultrafast detectors for future HEP experiments and GHz hard X-ray imaging for future XFEL facilities. A crucial issue for its application is the spectral response of photodetectors down to VUV. In this paper, we compare quantum efficiency and photon detection efficiency spectra measured for several UV photodetectors down to 200 nm. Their figures of merit on the detection efficiency for the fast component and the suppression of the slow component are also discussed.

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Design and status of the Mu2e crystal calorimeter

Cited by 6 publications

References 4 publications

Development, construction and tests of the Mu2e electromagnetic calorimeter mechanical structures

Development, construction and tests of the Mu2e electromagnetic calorimeter mechanical structures

Muon to electron conversion search in the presence of Al nuclei at the Fermilab Mu2e experiment: Motivation, Design and Progress

Spectral Response of UV Photodetectors for Barium Fluoride Crystal Readout

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