Effects of Slip Planes on Stresses in MICE Coupling Solenoid Coil Assembly

Wang, L; Pan, Heng; Wu, Hong; Guo, Xiaofeng; Cheng, Yuansheng; Green, M A

doi:10.1109/tasc.2010.2040915

Cited by 4 publications

(3 citation statements)

References 5 publications

(5 reference statements)

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“…The slip planes between the coupling coil and the mandrel mainly have a great effect on the transverse shear stresses induced by the thermal contraction during cool down process [10]. According to the analyses, the slip planes can remarkably reduce the cracking range of epoxy and the dissipated energy.…”

Section: Effect Of Slip Planes On Mechanical Stabilitymentioning

confidence: 98%

Study on the Mechanical Instability of MICE Coupling Magnets

Wang

Pan

Guo

et al. 2011

IEEE Trans. Appl. Supercond.

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Abstract-The superconducting coupling solenoid magnet is one of the key equipment in the Muon Ionization Cooling Experiment (MICE). The coil has an inner radius of 750 mm, length of 281 mm and thickness of 104 mm at room temperature. The peak induction in the coil is about 7.3 T with a full current of 210 A. The mechanical disturbances which might cause the instability of the impregnated superconducting magnet involve the frictional motion between conductors and the cracking of impregnated materials. In this paper, the mechanical instability of the superconducting coupling magnet was studied. This paper presents the numerical calculation results of the minimum quench energy (MQE) of the coupling magnet, as well as the dissipated strain energy in the stress concentration region when the epoxy cracks and the frictional energy caused by "stick-slip" of the conductor based on the bending theory of beam happens. Slip planes are used in the coupling coil and the frictional energy due to "slow slip" at the interface of the slip planes was also investigated. The dissipated energy was compared with MQE, and the results show that the cracking of epoxy resin in the region of shear stress concentration is the main factor for premature quench of the coil.

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Section: Effect Of Slip Planes On Mechanical Stabilitymentioning

confidence: 98%

Study on the Mechanical Instability of MICE Coupling Magnets

Wang

Pan

Guo

et al. 2011

IEEE Trans. Appl. Supercond.

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“…The winding pre-tension is set as 59 MPa on the conductor and 60MPa on the banding for the prototype coil, while 60 MPa on the conductor and 60 MPa on the banding for the coupling coil. The element birth and death technique and the multi-load technology were applied for the stress simulation exactly same as those for the coupling coil [4]. Fig.…”

Section: Stress Distribution In the Coil Assemblymentioning

confidence: 99%

“…Because of high magnetic field and large size, the stress induced inside the coil assembly during cool down and full charge is relatively high. The severe stress and strain situation is the potential to cause the magnet quench or training during charging [4].…”

Section: Introductionmentioning

confidence: 99%

Design and Construction of a Prototype Solenoid Coil for MICE Coupling Magnets

Wang¹,

Pan

Guo

et al. 2010

IEEE Trans. Appl. Supercond.

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Abstract-A superconducting coupling solenoid mounted around four conventional RF cavities, which produces up to 2.6 T central magnetic field to keep the muons within the cavities, is to be used for the Muon Ionization Cooling Experiment (MICE). The coupling coil made from copper matrix NbTi conductors is the largest of three types of magnets in MICE both in terms of 1.5 m inner diameter and about 13MJ stored magnetic energy at full operation current of 210A. The stress induced inside the coil assembly during cool down and magnet charging is relatively high. In order to validate the design method and develop the coil winding technique with inside-wound SC splices required for the coupling coil, a prototype coil made from the same conductor and with the same diameter and thickness but only one-fourth long as the coupling coil was designed and fabricated by ICST. The prototype coil was designed to be charged to strain conditions that are equivalent or greater than would be encountered in the coupling coil. This paper presents detailed design of the prototype coil as well as developed coil winding skills. The analyses on stress in the coil assembly and quench process were carried out.

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