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The LHCb upgrade I
Authors:
LHCb collaboration,
R. Aaij,
A. S. W. Abdelmotteleb,
C. Abellan Beteta,
F. Abudinén,
C. Achard,
T. Ackernley,
B. Adeva,
M. Adinolfi,
P. Adlarson,
H. Afsharnia,
C. Agapopoulou,
C. A. Aidala,
Z. Ajaltouni,
S. Akar,
K. Akiba,
P. Albicocco,
J. Albrecht,
F. Alessio,
M. Alexander,
A. Alfonso Albero,
Z. Aliouche,
P. Alvarez Cartelle,
R. Amalric,
S. Amato
, et al. (1298 additional authors not shown)
Abstract:
The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their select…
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The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their selection in real time. The experiment's tracking system has been completely upgraded with a new pixel vertex detector, a silicon tracker upstream of the dipole magnet and three scintillating fibre tracking stations downstream of the magnet. The whole photon detection system of the RICH detectors has been renewed and the readout electronics of the calorimeter and muon systems have been fully overhauled. The first stage of the all-software trigger is implemented on a GPU farm. The output of the trigger provides a combination of totally reconstructed physics objects, such as tracks and vertices, ready for final analysis, and of entire events which need further offline reprocessing. This scheme required a complete revision of the computing model and rewriting of the experiment's software.
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Submitted 10 September, 2024; v1 submitted 17 May, 2023;
originally announced May 2023.
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Optimization of laser stabilization via self-injection locking to a whispering-gallery-mode microresonator: experimental study
Authors:
Artem E. Shitikov,
Ilya I. Lykov,
Oleg V. Benderov,
Dmitry A. Chermoshentsev,
Ilya K. Gorelov,
Andrey N. Danilin,
Ramzil R. Galiev,
Nikita M. Kondratiev,
Steevy J. Cordette,
Alexander V. Rodin,
Anatoly V. Masalov,
Valery E. Lobanov,
Igor A. Bilenko
Abstract:
Self-injection locking of a diode laser to a high-quality-factor microresonator is widely used for frequency stabilization and linewidth narrowing. We constructed several microresonator-based laser sources with measured instantaneous linewidths of 1 Hz and used them for investigation and implementation of the self-injection locking effect. We studied analytically and experimentally the dependence…
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Self-injection locking of a diode laser to a high-quality-factor microresonator is widely used for frequency stabilization and linewidth narrowing. We constructed several microresonator-based laser sources with measured instantaneous linewidths of 1 Hz and used them for investigation and implementation of the self-injection locking effect. We studied analytically and experimentally the dependence of the stabilization coefficient on tunable parameters such as locking phase and coupling rate. It was shown that precise control of the locking phase allows fine tuning of the generated frequency from the stabilized laser diode. We also showed that it is possible for such laser sources to realize fast continuous and linear frequency modulation by injection current tuning inside the self-injection locking regime. We conceptually demonstrate coherent frequency-modulated continuous wave LIDAR over a distance of 10 km using such a microresonator-stabilized laser diode in the frequency-chirping regime and measure velocities as low as sub-micrometer per second in the unmodulated case. These results could be of interest for cutting-edge technology applications such as space debris monitoring and long-range object classification, high resolution spectroscopy and others.
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Submitted 24 November, 2022; v1 submitted 11 October, 2022;
originally announced October 2022.
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Production and Integration of the ATLAS Insertable B-Layer
Authors:
B. Abbott,
J. Albert,
F. Alberti,
M. Alex,
G. Alimonti,
S. Alkire,
P. Allport,
S. Altenheiner,
L. Ancu,
E. Anderssen,
A. Andreani,
A. Andreazza,
B. Axen,
J. Arguin,
M. Backhaus,
G. Balbi,
J. Ballansat,
M. Barbero,
G. Barbier,
A. Bassalat,
R. Bates,
P. Baudin,
M. Battaglia,
T. Beau,
R. Beccherle
, et al. (352 additional authors not shown)
Abstract:
During the shutdown of the CERN Large Hadron Collider in 2013-2014, an additional pixel layer was installed between the existing Pixel detector of the ATLAS experiment and a new, smaller radius beam pipe. The motivation for this new pixel layer, the Insertable B-Layer (IBL), was to maintain or improve the robustness and performance of the ATLAS tracking system, given the higher instantaneous and i…
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During the shutdown of the CERN Large Hadron Collider in 2013-2014, an additional pixel layer was installed between the existing Pixel detector of the ATLAS experiment and a new, smaller radius beam pipe. The motivation for this new pixel layer, the Insertable B-Layer (IBL), was to maintain or improve the robustness and performance of the ATLAS tracking system, given the higher instantaneous and integrated luminosities realised following the shutdown. Because of the extreme radiation and collision rate environment, several new radiation-tolerant sensor and electronic technologies were utilised for this layer. This paper reports on the IBL construction and integration prior to its operation in the ATLAS detector.
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Submitted 6 June, 2018; v1 submitted 2 March, 2018;
originally announced March 2018.
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Measurement of the $B_c^{\pm}$ production cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
Authors:
CDF Collaboration,
T. Aaltonen,
S. Amerio,
D. Amidei,
A. Anastassov,
A. Annovi,
J. Antos,
G. Apollinari,
J. A. Appel,
T. Arisawa,
A. Artikov,
J. Asaadi,
W. Ashmanskas,
B. Auerbach,
A. Aurisano,
F. Azfar,
W. Badgett,
T. Bae,
A. Barbaro-Galtieri,
V. E. Barnes,
B. A. Barnett,
P. Barria,
P. Bartos,
M. Bauce,
F. Bedeschi
, et al. (374 additional authors not shown)
Abstract:
We describe a measurement of the ratio of the cross sections times branching fractions of the $B_c^+$ meson in the decay mode $B_c^+ \rightarrow J/ψμν$ to the $B^+$ meson in the decay mode $B^+ \rightarrow J/ψK^+$ in proton-antiproton collisions at center-of-mass energy $\sqrt{s}=1.96$ TeV. The measurement is based on the complete CDF Run II data set, which comes from an integrated luminosity of…
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We describe a measurement of the ratio of the cross sections times branching fractions of the $B_c^+$ meson in the decay mode $B_c^+ \rightarrow J/ψμν$ to the $B^+$ meson in the decay mode $B^+ \rightarrow J/ψK^+$ in proton-antiproton collisions at center-of-mass energy $\sqrt{s}=1.96$ TeV. The measurement is based on the complete CDF Run II data set, which comes from an integrated luminosity of $8.7\,{\rm fb}^{-1}$. The ratio of the production cross sections times branching fractions for $B_c^+$ and $B_c^+$ mesons with momentum transverse to the beam greater than $6~\textrm{GeV}/c$ and rapidity magnitude smaller than 0.6 is $0.211\pm 0.012~\mbox{(stat)}^{+0.021}_{-0.020}~\mbox{(syst)}$. Using the known $B^+ \rightarrow J/ψK^+$ branching fraction, the known $B^+$ production cross section, and a selection of the predicted $B_c^+ \rightarrow J/ψμν$ branching fractions, the range for the total $B_c^+$ production cross section is estimated.
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Submitted 26 March, 2016; v1 submitted 15 January, 2016;
originally announced January 2016.
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A Leakage Current-based Measurement of the Radiation Damage in the ATLAS Pixel Detector
Authors:
Igor V. Gorelov
Abstract:
A measurement has been made of the radiation damage incurred by the ATLAS Pixel Detector barrel silicon modules from the beginning of operations through the end of 2012. This translates to hadronic fluence received over the full period of operation at energies up to and including 8 TeV. The measurement is based on a per-module measurement of the silicon sensor leakage current. The results are pres…
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A measurement has been made of the radiation damage incurred by the ATLAS Pixel Detector barrel silicon modules from the beginning of operations through the end of 2012. This translates to hadronic fluence received over the full period of operation at energies up to and including 8 TeV. The measurement is based on a per-module measurement of the silicon sensor leakage current. The results are presented as a function of integrated luminosity and compared to predictions by the Hamburg Model. This information can be used to predict limits on the lifetime of the Pixel Detector due to current, for various operating scenarios.
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Submitted 11 February, 2015; v1 submitted 28 January, 2015;
originally announced January 2015.
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ATLAS Pixel Radiation Monitoring with HVPP4 System
Authors:
Igor Gorelov,
Martin Hoeferkamp,
Sally Seidel,
Konstantin Toms
Abstract:
In this talk we present the basis for the protocol for radiation monitoring of the ATLAS Pixel Sensors. The monitoring is based on a current measurement system, HVPP4. The status on the ATLAS HVPP4 system development is also presented.
In this talk we present the basis for the protocol for radiation monitoring of the ATLAS Pixel Sensors. The monitoring is based on a current measurement system, HVPP4. The status on the ATLAS HVPP4 system development is also presented.
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Submitted 1 November, 2009;
originally announced November 2009.