Estimation of stepping motor current from long distances through cable-length-adaptive piecewise affine virtual sensor

<p>In this paper a piecewise affine virtual sensor is used for the estimation of the motor-side current of hybrid stepper motors, which actuate the LHC (Large Hadron Collider) collimators at CERN. The estimation is performed starting from measurements of the current in the driver, which is connected to the motor by a long cable (up to 720 m). The measured current is therefore affected by noise and ringing phenomena. The proposed method does not require a model of the cable, since it is only based on measured data and can be used with cables of different length. A circuit architecture suitable for FPGA implementation has been designed and the effects of fixed point representation of data are analyzed.</p>

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Performance and luminosity models for heavy-ion operation at the CERN Large Hadron Collider

The European Physical Journal Plus ◽

10.1140/epjp/s13360-021-01685-5 ◽

2021 ◽

Vol 136 (7) ◽

Author(s):

R. Bruce ◽

M. A. Jebramcik ◽

J. M. Jowett ◽

T. Mertens ◽

M. Schaumann

Keyword(s):

Large Hadron Collider ◽

Differential Equations ◽

Numerical Solution ◽

Particle Tracking ◽

Hadron Collider ◽

Heavy Ion ◽

Measured Data ◽

High Luminosity ◽

Cern Large Hadron Collider ◽

Beam Parameters

AbstractA good understanding of the luminosity performance in a collider, as well as reliable tools to analyse, predict, and optimise the performance, is of great importance for the successful planning and execution of future runs. In this article, we present two different models for the evolution of the beam parameters and the luminosity in heavy-ion colliders. The first, Collider Time Evolution is a particle tracking code, while the second, the Multi-Bunch Simulation is based on the numerical solution of ordinary differential equations for beam parameters. As a benchmark, we compare simulations and data for a large number of physics fills in the 2018 Pb–Pb run at the CERN Large Hadron Collider (LHC), finding excellent agreement for most parameters, both between the simulations and with the measured data. Both codes are then used independently to predict the performance in future heavy-ion operation, with both Pb–Pb and p–Pb collisions, at the LHC and its upgrade, the high-luminosity LHC. The use of two independent codes based on different principles gives increased confidence in the results.

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Physics at the Large Hadron Collider. Higgs boson (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 26 February 2014)

Uspekhi Fizicheskih Nauk ◽

10.3367/ufnr.0184.201409g.0985 ◽

2014 ◽

Vol 184 (9) ◽

pp. 985-1016

Keyword(s):

Higgs Boson ◽

Large Hadron Collider ◽

Hadron Collider ◽

Scientific Session ◽

Physical Sciences ◽

Russian Academy Of Sciences ◽

Academy Of Sciences

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Operational Experience and Performance with the ATLAS Pixel detector at the Large Hadron Collider at CERN

Journal of Instrumentation ◽

10.1088/1748-0221/15/05/c05010 ◽

2020 ◽

Vol 15 (05) ◽

pp. C05010-C05010

Author(s):

F. Sohns

Keyword(s):

Large Hadron Collider ◽

Hadron Collider ◽

Operational Experience ◽

Pixel Detector ◽

And Performance

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Exploring color-octet scalar parameter space in minimal R-symmetric models

Journal of High Energy Physics ◽

10.1007/jhep11(2020)024 ◽

2020 ◽

Vol 2020 (11) ◽

Cited By ~ 1

Author(s):

Linda M. Carpenter ◽

Taylor Murphy ◽

Matthew J. Smylie

Keyword(s):

Large Hadron Collider ◽

Parameter Space ◽

Branching Fractions ◽

Hadron Collider ◽

Collider Phenomenology ◽

Decay Channels ◽

Color Octet ◽

Supersymmetric Models ◽

Three Body ◽

Displaced Vertex

Abstract In this work we study the collider phenomenology of color-octet scalars (sgluons) in minimal supersymmetric models endowed with a global continuous R symmetry. We systematically catalog the significant decay channels of scalar and pseudoscalar sgluons and identify novel features that are natural in these models. These include decays in nonstandard diboson channels, such as to a gluon and a photon; three-body decays with considerable branching fractions; and long-lived particles with displaced vertex signatures. We also discuss the single and pair production of these particles and show that they can evade existing constraints from the Large Hadron Collider, to varying extents, in large regions of reasonable parameter space. We find, for instance, that a 725 GeV scalar and a 350 GeV or lighter pseudoscalar can still be accommodated in realistic scenarios.

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