Performance Evaluation and Quality Assurance Management During the Series Power Tests of LHC Main Lattice Magnets

Siemko, A.; Pugnat, P.

doi:10.1109/tasc.2008.921904

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Each complete dipole was delivered to CERN for final assembly into the vacuum cryostat and cold testing. Every magnet was cooled and trained to reach a field of 9 T [13]. As the current in the magnet increases, so do the electromagnetic forces, which can cause minute movements of the pre-stressed coils.…”

Section: (A) Industrial Procurementmentioning

confidence: 99%

The technical challenges of the Large Hadron Collider

Collier

2015

Phil. Trans. R. Soc. A.

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The Large Hadron Collider (LHC) is a 27 km circumference hadron collider, built at CERN to explore the energy frontier of particle physics. Approved in 1994, it was commissioned and began operation for data taking in 2009. The design and construction of the LHC presented many design, engineering and logistical challenges which involved pushing a number of technologies well beyond their level at the time. Since the start-up of the machine, there has been a very successful 3-year run with an impressive amount of data delivered to the LHC experiments. With an increasingly large stored energy in the beam, the operation of the machine itself presented many challenges and some of these will be discussed. Finally, the planning for the next 20 years has been outlined with progressive upgrades of the machine, first to nominal energy, then to progressively higher collision rates. At each stage the technical challenges are illustrated with a few examples.

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Section: (A) Industrial Procurementmentioning

confidence: 99%

The technical challenges of the Large Hadron Collider

Collier

2015

Phil. Trans. R. Soc. A.

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“…1 and 2), or as an histogram of the first (or second) quench over a family of magnets [12]. During the LHC production, data have been often presented as histograms giving the number of quenches needed to reach nominal or ultimate current [9], [10].…”

Section: B Data Representationmentioning

confidence: 99%

Predicting the Quench Behavior of the LHC Dipoles During Commissioning

Lorin

Siemko

Todesco

et al. 2010

IEEE Trans. Appl. Supercond.

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Abstract-The LHC hardware commissioning has shown a considerable difference of performance between the three dipole manufacturers (Firm1, Firm2 and Firm3). More than 90% of the quenches occurred in the dipoles made by Firm3, less than 10% in Firm2, and no one in Firm1. In this paper we propose a Monte-Carlo method based on the quench performance data of individual magnets that accounts for this behavior. The model relies on the data of the virgin training and on correlations with quench after a thermal cycle as measured on a sample of magnets. This model is used to derive estimates of the training behavior in the machine. A comparison with data gathered during the hardware commissioning shows that the model works well for low fields, and that, starting from fields corresponding to an energy of about 6.3 TeV, a slower training in the magnets of one manufacturer is observed.

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“…The majority of the yoked apertures were tested as part of the acceptance tests for quench performance in a vertical cryostat facility at CERN commonly named "Block 4" [3]. After assembling them in cold masses and inserting in final cryostats, the completed cryo-magnets were tested again for quench performance and, in some cases, magnetic measurements were performed in the SM18 magnet testing facility [4]. The cryo-magnets were then lowered in the tunnel, interconnected to each other and finally connected to the cryogenic system.…”

Section: Introductionmentioning

confidence: 99%

Quench Performance of the LHC Insertion Magnets

Lasheras

Delsolaro

Siemko

et al. 2009

IEEE Trans. Appl. Supercond.

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Abstract-After final installation in the LHC tunnel, the MQM and MQY quadrupole magnets of the LHC insertions are now being commissioned to their nominal currents. These two types of magnets operate at 1.9 K and 4.5 K and with nominal currents ranging from 3600 A to 5390 A. From the very first acceptance tests of the bare magnets coming from the manufacturers, they have been powered using different cycles, in different configurations, at different temperatures and in different tests facilities. In this paper we present the global results of these powering tests. We aim at separating common from individual features of these groups of magnets. Temperature dependence of the training, temperature margin, and ultimate current can be extracted from these tests. As these magnets are used to match the optics and the dispersion in the machine, the projected ultimate current at which they can be operated is critical in view of operation of LHC.Index Terms-LHC, power tests, quench training, superconducting accelerator magnets.

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Performance Evaluation and Quality Assurance Management During the Series Power Tests of LHC Main Lattice Magnets

Cited by 5 publications

References 8 publications

The technical challenges of the Large Hadron Collider

The technical challenges of the Large Hadron Collider

Predicting the Quench Behavior of the LHC Dipoles During Commissioning

Quench Performance of the LHC Insertion Magnets

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