Industrial production of RHIC magnets

Anerella, M.; Fisher, Donna; Sheedy, E.; McGuire, Thomas

doi:10.1109/20.508567

Cited by 11 publications

(5 citation statements)

References 4 publications

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“…Referring to the Log Linear model, despite of the large oscillation, we can estimate that the typical learning percentage for the LHC Main Dipole Assembly is between 70% and 80%. During RHIC construction the estimation of similar parameter provided, a value of 85% [10,11].…”

Section: Learning In Term Of Reduction Of Production Timementioning

confidence: 99%

Application of the Learning Curve Analysis to the LHC Main Dipole Production: First Assessment

Fessia

Rossi

Krog-Pedersen

2006

IEEE Trans. Appl. Supercond.

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About two third of the LHC main dipoles have been delivered by the three suppliers charged of the production. The training of the staff, mostly hired just for this manufacture, and the natural improvement of the procedures with the acquired experience, decrease naturally the time necessary for the assembly of a unit. The aim of this paper is to apply methodologies like the cost-based learning curves and the time-based learning curves to the LHC Main Dipole comparing the estimated learning percentage to the ones experienced in other industries. This type of analysis, still in a preliminary phase and here applied to about 40% of the total production of the LHC magnets that will end by 2006, shows that our production has a relatively high learning percentage and it is similar to aerospace and complex machine tools for new models. Therefore with the LHC project, accelerator magnets seem to have reached industrial maturity and this production can be used as bench mark for other large scientific projects implying series production. Abstract-About two third of the LHC main dipoles have been delivered by the three suppliers charged of the production. The training of the staff, mostly hired just for this manufacture, and the natural improvement of the procedures with the acquired experience, decrease naturally the time necessary for the assembly of a unit. The aim of this paper is to apply methodologies like the cost-based learning curves and the timebased learning curves to the LHC Main Dipole comparing the estimated learning percentage to the ones experienced in other industries. This type of analysis, still in a preliminary phase and here applied to about 40% of the total production of the LHC magnets that will end by 2006, shows that our production has a relatively high learning percentage and it is similar to aerospace and complex machine tools for new models. Therefore with the LHC project, accelerator magnets seem to have reached industrial maturity and this production can be used as bench mark for other large scientific projects implying series production. IndexTermsAccelerator magnets, large scale superconductivity, production management.

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Section: Learning In Term Of Reduction Of Production Timementioning

confidence: 99%

Application of the Learning Curve Analysis to the LHC Main Dipole Production: First Assessment

Fessia

Rossi

Krog-Pedersen

2006

IEEE Trans. Appl. Supercond.

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“…On the other hand the correctors should stay in average within 0.3 mm from the geometric axis with an error not in excess of 0.5 mm, see [1]. The most critical process is the bending of the cylindrical structure of the magnet in the horizontal plane (see also [2]). The curved shape imposed by the welding press, must indeed be preserved throughout the rest of the assembly, transport, testing stages (from now called pre-operative stages), the positioning in the tunnel and the start of the operative stages.…”

Section: Introductionmentioning

confidence: 99%

Shape Analysis of the LHC Pre-Series Dipoles

Gubello

China

Scandale

2004

IEEE Trans. Appl. Supercond.

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Abstract-This paper presents the results of a comprehensive analysis, from the geometric point of view, of the pre-series LHC dipoles. The progressive change of the imposed magnet shape has been monitored from the first assembly stage until after the cold test. Data concerning the error on sagitta, extremity positions and sextupolar corrector positions are provided for the pre-series magnets. Implications of aligning out-of-tolerance dipoles by the extremities are also discussed.Index Terms-Corrector positions, dipole alignment, dipole shape.

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“…Shim thickness can therefore be varied to optimize the magnet performances. Adjustable shims have been used in magnets for the Tevatron [5], for the High Electron Ring Accelerator (HERA) [6], in the Superconducting Super Collider (SSC) magnet prototypes [7], and for the Relativistic Heavy Ion Collider (RHIC) [8,9]. They aim at optimizing either the mechanical or the magnetic performance.…”

Section: Introductionmentioning

confidence: 99%

“…If we assume a constant collar cavity and a constant coil size, the adjustable shim will also modify prestress. In a production phase one has a mix of both cases, where an acceptable range has been defined for the prestress, and shims are used both to stay in this range and to reach the optimal coil size for field quality (see for instance the experience of Tevatron [5], HERA [6], and RHIC [8,9]). …”

Section: Introductionmentioning

confidence: 99%

Azimuthal coil size and field quality in the main CERN Large Hadron Collider dipoles

Ferracin

Scandale

Todesco

et al. 2002

Phys. Rev. ST Accel. Beams

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Field quality in superconducting magnets strongly depends on the geometry of the coil. Fiberglass spacers (shims) placed between the coil and the collars have been used to optimize magnetic and mechanical performances of superconducting magnets in large accelerators. A change in the shim thickness affects both the geometry of the coil and its state of compression (prestress) under operational conditions. In this paper we develop a coupled magnetomechanical model of the main Large Hadron Collider dipole. This model allows us to evaluate the prestress dependence on the shim thickness and the map of deformations of the coil and the collars. Results of the model are compared to experimental measurements carried out in a dedicated experiment, where a magnet model has been reassembled 5 times with different shims. A good agreement is found between simulations and experimental data both on the mechanical behavior and on the field quality. We show that this approach allows us to improve this agreement with respect to models previously used in the literature. We finally evaluate the range of tunability that will be provided by shims during the production of the Large Hadron Collider main dipoles.

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Industrial production of RHIC magnets

Cited by 11 publications

References 4 publications

Application of the Learning Curve Analysis to the LHC Main Dipole Production: First Assessment

Application of the Learning Curve Analysis to the LHC Main Dipole Production: First Assessment

Shape Analysis of the LHC Pre-Series Dipoles

Azimuthal coil size and field quality in the main CERN Large Hadron Collider dipoles

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