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Training the dipoles
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In this paper, an overview of these quenches was given, and the quench levels were compared to the training observed in SM-18, and an estimate was given of the total number of training quenchers required to reach 6, 6.5, and 7 TeV in all eight sectors.Abstract:
During the hardware commissioning in 2008 more than 30 training quenches were performed in the main dipole circuits in sectors 4-5, 5-6, and 7-8. An overview of these quenches will be given, and the quench levels will be compared to the training observed in SM-18. Quench propagation to adjacent dipoles will be discussed, and an estimate will be given of the total number of training quenches required to reach 6, 6.5, and 7 TeV in all eight sectors. INTRODUCTION During the hardware commissioning in 2008 more than 30 training quenches were performed in the main dipole circuits in sectors 4-5, 5-6, and 7-8. Each sector contains 154 dipoles (MB) assembled by three different companies, Alstom (ALS), Ansaldo (ANS), and Noell (NOE), see Table 1. Note that the numbers for sector 3-4 denote the original distribution which will alter due to the repair work after the incident. Table 1: Distribution of the dipole magnets per sector for each of the three cold mass assemblersread more
Citations
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Journal ArticleDOI
Predicting the Quench Behavior of the LHC Dipoles During Commissioning
TL;DR: In this paper, a Monte-Carlo method based on the quench performance data of individual magnets was proposed to account for the difference in performance between the three dipole manufacturers (Firm1, Firm2 and Firm3).
Dissertation
LHC main dipole magnet circuits: sustaining near-nominal beam energies
TL;DR: In this paper, the main dipole circuit's 13 kA superconducting busbars were used for magnet training at the Large Hadron Collider (LHC) to achieve 6.5 TeV operation.
Journal ArticleDOI
Training Behavior of the Main Dipoles in the Large Hadron Collider
Ezio Todesco,Bernhard Auchmann,Marta Bajko,Luca Bottura,Oliver Brüning,Gijs de Rijk,Paolo Fessia,Per Espen Hagen,Sandrine Le Naour,Michele Modena,Juan Carlos Perez,Lucio Rossi,R. Schmidt,Andrzej Siemko,J. P. Tock,Davide Tommasini,Arjan Verweij,Gerard Willering +17 more
TL;DR: In this article, an analysis of the quench performance of the LHC dipole magnets is reported, including individual reception tests and the 2008 and 2015 commissioning campaigns, to better understand the above-mentioned anomaly and give an outlook for future operation and possible increase of the operational field.
Journal ArticleDOI
Retraining of the 1232 Main Dipole Magnets in the LHC
Arjan Verweij,Bernhard Auchmann,M. Bednarek,L. Bottura,Z. Charifoulline,Sandor Feher,Per Espen Hagen,Michele Modena,S. Le Naour,Iván Romera,Andrzej Siemko,Jens Steckert,J. Ph. Tock,Ezio Todesco,Gerard Willering,Daniel Wollmann +15 more
TL;DR: In this article, the quench detection triggering heaters are used to quickly force the transition of the coil to the normal conducting state in case of a quench, and hence reduce the hot spot temperature.
DissertationDOI
A Measurement of Jet Shapes in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider
TL;DR: In this article, a study of jet shapes is presented using 300 nb−1 of proton-proton collision data collected at a center of mass energy of 7 TeV using the ATLAS detector at the Large Hadron Collider.
References
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Journal ArticleDOI
Long Term Stability of the LHC Superconducting Cryodipoles After Outdoor Storage
F. Seyvet,G.A. Izquierdo,Alessandro Bertarelli,O. Denis,P. El-Kallassi,E.D.F. Cano,Paolo Fessia,S.D. Ilie,J.B. Jeanneret,D. Letant,A. Poncet,P. Pugnat,Frederic Savary,Stefano Sgobba,Andrzej Siemko,Ezio Todesco,Davide Tommasini,R. Veness,B. Vullierme,Elena Wildner +19 more
TL;DR: In this paper, a dedicated task force was established to study all aspects of long term behavior of the stored superconducting dipoles, with particular emphasis on electrical and vacuum integrity, quench training behavior, magnetic field quality, performance of the thermal insulation, mechanical stability of magnet shape and of the interface between cold mass and cryostat, degradation of materials and welds.