Size and stiffness measurements on 9.5 m long LHC dipole coils

Zerobin, F.; Painer, M.; Eichberger, S.; Pichler, S.

doi:10.1109/20.305742

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…As already observed for other film-insulated superconducting cables [8][9][10][11][12][13][14][15][16][17], the coil features a strong stress-dependent rigidity and a stress-displacement curve characterised by a relevant mechanical hysteresis during the loading-unloading compression cycle.…”

Section: Introductionmentioning

confidence: 58%

Elastic modulus measurements of the LHC dipole superconducting coil at 300 K and at 77 K

Couturier¹,

Ferracin²,

Todesco³

et al. 2002

AIP Conference Proceedings

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We present measurements of the stress-displacement relation for the superconducting coils used in the Large Hadron Collider main magnets (dipoles and quadrupoles). This mechanical property is relevant to determine the correct amount of azimuthal pre-stress to be imposed on the coil. The hysteresis pattern in the loading and unloading curves is discussed. The stress-displacement curves are used to compute the corresponding elastic moduli and deformations. Measurements are also carried out at liquid nitrogen temperature, using the same framework to interpret experimental data. ABSTRACTWe present measurements of the stress-displacement relation for the superconducting coils used in the Large Hadron Collider main magnets (dipoles and quadrupoles). This mechanical property is relevant to determine the correct amount of azimuthal pre-stress to be imposed on the coil. The hysteresis pattern in the loading and unloading curves is discussed. The stress-displacement curves are used to compute the corresponding elastic moduli and deformations. Measurements are also carried out at liquid nitrogen temperature, using the same framework to interpret experimental data.

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Section: Introductionmentioning

confidence: 58%

Elastic modulus measurements of the LHC dipole superconducting coil at 300 K and at 77 K

Couturier¹,

Ferracin²,

Todesco³

et al. 2002

AIP Conference Proceedings

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show abstract

“…No significant difference is found between the case of the full stack and of the stack with aluminum, whose stress losses differ by less than 10 MPa. A decrease in the thermal contraction coefficient of around 0.002 is found for the cavity with invar, where the stress loss is reduced by [15][16][17][18][19][20] MPa. This decrease is approximately constant for the five considered cases, leading to an offset between the two -curves.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 92%

“…Moreover, the unloading phase is considerably different from the loading one and varies according to the maximum load reached in the compression phase (mechanical hysteresis). As the superconducting coil is subjected to a loading-unloading cycle during magnet assembly, the final state of the coil at room temperature and its dimension [17], [18] is determined not only by its stress-strain relation, but also by the cycle used during the magnet assembly process.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical properties of the coil of the superconducting magnets for the Large Hadron Collider

Couturier

Ferracin²,

Scandale³

et al. 2002

IEEE Trans. Appl. Supercond.

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Abstract-The correct definition and measurement of the thermomechanical properties of the superconducting cable used in high-field magnets is crucial to study and model the behavior of the magnet coil from assembly to the operational conditions. In this paper, the authors analyze the superconducting coil of the main dipoles for the Large Hadron Collider. They describe an experimental setup for measuring the elastic modulus at room and at liquid nitrogen temperature and for evaluating the thermal contraction coefficient. The coils exhibit strong nonlinear stressstrain behavior characterized by hysteresis phenomena, which decreases from warm to cold temperature, and a thermal contraction coefficient, which depends on the stress applied to the cable during cooldown.

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Size and stiffness measurements on 9.5 m long LHC dipole coils

Cited by 2 publications

References 2 publications

Elastic modulus measurements of the LHC dipole superconducting coil at 300 K and at 77 K

Elastic modulus measurements of the LHC dipole superconducting coil at 300 K and at 77 K

Thermomechanical properties of the coil of the superconducting magnets for the Large Hadron Collider

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