Performance of the Totem Detectors at the LHC

Antchev, G.; Berretti, M.; Bozzo, M.; Heino, J.; Robutti, E.; Radicioni, E.; Procházka, J.; Atanassov, I.; Macrı́, M.; Eggert, K.; Turini, N.; Quinto, M.; Covault, C. E.; Grzanka, L.; Niewiadomski, H.; Oriunno, M.; Ruggiero, G.; Kopal, J.; García, F.; Österberg, K.; Gianì, S.; Doubek, M.; Sziklai, J.; Vetere, M. Lo; Catanesi, M. G.; Vacek, V.; Fiergolski, A.; Welti, J.; Pedreschi, E.; Oljemark, F.; Whitmore, J.; Csanád, M.; Minutoli, S.; Ravotti, F.; Lippmaa, J.; Bottigli, U.; Brücken, E.; Csörgő, T.; Aspell, P.; Wyszkowski, P.; Lami, S.; Rodríguez, F. Lucas; Ferro, F.; Taylor, C.; Thys, A.; Deile, M.; Lokajíček, M.; Hilden, T. E.; Ropelewski, L.; Latino, G.; Avati, V.; Radermacher, E.; Oliveri, E.; Buzzo, A.; Smajek, J.; Kašpar, J.; Spinella, F.; Orava, R.; Greco, V.; Bagliesi, Maria Grazia; Snoeys, W.; Mercadante, A.; Saarikko, H.; Lauhakangas, R.; Palazzi, P.; Leszko, T.; Lippmaa, É.; Cafagna, F.; Eremin, V.; Cecchi, Roberto; Nemes, F.; Bossini, E.; Scribano, A.; Minafra, N.; Berardi, V.; Mäki, T.; Karev, A.; Kundrát, V.; Baechler, J.; Vítek, Michal; Losurdo, L.

doi:10.1142/s0217751x13300469

Cited by 41 publications

(68 citation statements)

References 12 publications

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“…RPs were grouped in units (stations) composed by three RPs: one approaches the beam from the top, another from the bottom and the last from the side. The detection of the protons is made possible thanks to the adoption of edgeless silicon strip detectors designed by the Collaboration to be efficient down to ∼ 50 µm from their edge [6], as shown The TOTEM apparatus and the performance of the detectors are discussed in more detail in [7].…”

Section: The Totem Experimentsmentioning

confidence: 99%

Development of a timing detector for the TOTEM experiment at the LHC

Minafra

2017

Eur. Phys. J. Plus

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he LHC is at present the world's largest and highest-energy particle accelerator, hosted at CERN, the European particle physics laboratory near Geneva. The TOTEM experiment was designed to measure the total pp cross section and to study elastic scattering and diffractive dissociation at LHC. The protons that underwent elastic interaction are lightly deflected and, to detect them, TOTEM has installed silicon strip detectors at more than 200 m from the interaction point that can transversally approach the beam down to few millimetres, thanks to a movable piece of the vacuum chamber called Roman Pot.During the first period of operation of the LHC, the TOTEM run campaigns were accomplished during low luminosity dedicated data taking. However, to allow the investigation of rare phenomena, an upgrade program has been proposed by the TOTEM Collaboration, to make possible the data taking at higher luminosities. In particular, a cornerstone of the upgrade program is the inclusion of a fast timing detector in the experimental apparatus to improve the capability of the apparatus to work in high pileup conditions.The main topic of this thesis is the design and the characterization of a fast timing detector for high energy protons. After a survey of the most promising sensor technologies available for fast timing measurements, it was proved, thanks to an extensive campaign of tests using particle beams, that the needed resolution, below 100 ps, was achievable using diamond sensors. In particular, different approaches for the front-end electronics were investigated: some commercially available amplifiers and the timing detector designed by the HADES Collaboration were characterized.Then, a diamond detector, fully compliant with the TOTEM requirements, was designed, tested and prepared for the installation in the RP system. In parallel, 13Introduction other solutions were investigated, such as 3D graphitized diamond sensors and an amplitude dependent amplifier, designed to increase the signal to noise ratio: the gain of the amplifier is small for low amplitude input (noise) and higher in presence of a signal.In particular, the first chapter describes the TOTEM experiment and the main physics results obtained during the first run of the LHC. Then, the physics motivation and the technological challenges of the consolidation and upgrade programs are discussed. Particular attention is given to the impedance optimization of the Roman Pot, described in the second chapter. In fact, the Roman Pot creates a cavity inside the primary vacuum that can resonate at the passage of the beam.This resonance can introduce instabilities in the beam and can, in the worst cases, damage the detector because of the excessive heat generated. The Roman Pot has been optimized in this sense and two new shapes have been designed and realized and, only thanks to this optimization, the Roman Pot can be safely inserted at few millimetres from the beam even at the highest intensities foreseen for the LHC.In the third chapter, the properties of diamond are dis...

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Section: The Totem Experimentsmentioning

confidence: 99%

Development of a timing detector for the TOTEM experiment at the LHC

Minafra

2017

Eur. Phys. J. Plus

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“…The TOTEM experiment [8,9] is composed of three subdetectors: the Roman Pot detectors and the T1 and T2 telescopes. The related right-handed coordinate system has the origin at the nominal interaction point 5 (IP5) of LHC, the x-axis pointing towards the centre of the accelerator, the yaxis pointing upwards, and the z-axis pointing along the anticlockwise-beam direction.…”

Section: Experimental Apparatus and Track Reconstructionmentioning

confidence: 99%

Measurement of the forward charged particle pseudorapidity density in pp collisions at $$\sqrt{s} = 8$$ s = 8 TeV using a displaced interaction point

et al. 2015

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The pseudorapidity density of charged particles dN ch /dη is measured by the TOTEM experiment in protonproton collisions at √ s = 8 TeV within the range 3.9 < η < 4.7 and −6.95 < η < −6.9. Data were collected in a low intensity LHC run with collisions occurring at a disa e-mail: mirko.berretti@cern.ch tance of 11.25 m from the nominal interaction point. The data sample is expected to include 96-97 % of the inelastic proton-proton interactions. The measurement reported here considers charged particles with p T > 0 MeV/c, produced in inelastic interactions with at least one charged particle in −7 < η < −6 or 3.7 < η < 4.8. The dN ch /dη has been found to decrease with |η|, from 5.11 ± 0.73 at η = 3.95 123 126 Page 2 of 9 Eur. Phys. J. C (2015) 75 :126 to 1.81 ± 0.56 at η = −6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement.

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“…The CMS+TOTEM Precision Proton Spectrometer (CT-PPS) [1] is a joint project of the CMS [2] and TOTEM [3] collaborations, aiming to operate near-beam forward proton detectors in high luminosity proton-proton running at the Large Hadron Collider (LHC). CT-PPS is designed for the study of the so-called "exclusive" reactions (pp → pX p), primarily via either γγ fusion, or gluongluon interactions, by detection of protons scattered at very small angles and carrying a substantial fraction of the incoming beam momentum.…”

Section: Introductionmentioning

confidence: 99%

Measurement of high-mass dilepton and diphoton production with the CMS-TOTEM Precision Proton Spectrometer

Shchelina¹,

collaborations²

2017

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017)

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The process pp → pµ + µ − p ( * ) has been observed at the LHC for dimuon masses larger than 110 GeV in pp collisions at √ s = 13 TeV. Here p ( * ) indicates the second proton is undetected, and either remains intact or dissociates into a low-mass state p * . The scattered proton has been measured in the CMS-TOTEM Precision Proton Spectrometer (CT-PPS). The spectrometer operated for the first time in 2016, collecting ∼10fb −1 of data in regular, high-luminosity fills. The procedure for detector alignment, optics corrections, and data analysis including background estimate are described. The present data constitute the first evidence of this process at such masses. They also demonstrate that CT-PPS performs as expected.

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Performance of the Totem Detectors at the LHC

Cited by 41 publications

References 12 publications

Development of a timing detector for the TOTEM experiment at the LHC

Development of a timing detector for the TOTEM experiment at the LHC

Measurement of the forward charged particle pseudorapidity density in pp collisions at $$\sqrt{s} = 8$$ s = 8 TeV using a displaced interaction point

Measurement of high-mass dilepton and diphoton production with the CMS-TOTEM Precision Proton Spectrometer

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