Latest Progress on the Iseult/INUMAC Whole Body 11.7 T MRI Magnet

Védrine, P.; Maksoud, W. Abdel; Aubert, G.; Beaudet, F; Belorgey, J.; Bermond, S.; Berriaud, Christophe; Brédy, P.; Bresson, Daniel; Donati, A.; Dubois, Olivier; Gilgrass, G.; Juster, F.P.; Lannou, H.; Meuris, C.; Molinié, F.; Nusbaum, M.; Nunio, F.; Payn, A.; Schild, T.; Scola, L.; Sinanna, A.

doi:10.1109/tasc.2011.2176093

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…The conductor delivery should be fully finished at the beginning of 2012. The entire Iseult magnet is now in the industrial manufacturing phase [5].…”

Section: Discussionmentioning

confidence: 99%

Iseult/INUMAC 11.7 T Conductor Production Status

Berriaud¹,

Bermond²,

Dechambre³

et al. 2012

IEEE Trans. Appl. Supercond.

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The Iseult/INUMAC 11.7 T MRI magnet uses NbTi conductors larger than those typically used in conventional MRI magnets. The principal conductors are the main coil one, producing the magnetic field of 11.7 T and the conductor of the shielding coil that limits the fringe field. Both conductors are being produced by Luvata Waterbury Inc. The main coil conductor is a Rutherford cable in a copper channel (160 km) and carries 1500 A at 12 T and 2.8 K (2727 A at 9.5 T and 4.2 K). The shielding coil conductor is a wire in channel (60 km) and carries 2100 A at 5 T and 4.2 K. The conductor shape must be very precise with reproducible dimensions (tolerances below 15 microns) to enable good magnetic field homogeneity. They must also simultaneously exhibit a low electrical resistance (20 at 10 K and 12 T) and a high mechanical strength . Conductors of this industrial production are characterized by mechanical, electrical and geometrical measurements.

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“…The conductor delivery should be fully finished at the beginning of 2012. The entire Iseult magnet is now in the industrial manufacturing phase [5].…”

Section: Discussionmentioning

confidence: 99%

Iseult/INUMAC 11.7 T Conductor Production Status

Berriaud¹,

Bermond²,

Dechambre³

et al. 2012

IEEE Trans. Appl. Supercond.

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“…The 8-rod architecture has been found in the quadrupole doublets of the FAIR (Facility for Antiproton and Ion Research) [26,27] and the coils of an MRI at NeuroSpin [48,49]. The 8-double-band suspension system has been found in the analytical paper from the CAS (Chinese Academy of Sciences) [32], the wiggler of TLS (Taiwan Light Source) [24], the wiggler of IHEP (Institute of High Energy Physics of CAS) [22], the coupling solenoid of the MICE [25], and the undulator of SSRF [2,3].…”

Section: The "8-support" Architecture and Geometrymentioning

confidence: 99%

Literature Review of Suspension Systems for Superconducting Elements

Piacentini,

Dassa,

Perini

et al. 2023

Machines

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When designing suspension systems for superconducting elements, the primary challenge is to strike a balance between limiting the heat load to the cold mass and ensuring the proper mechanical resistance and/or stiffness of the system. This trade-off often leads engineers to choose from a limited set of materials and supporting architectures. The aim of this study is to provide an overview of the different overall designs. Scientific articles were searched within the Google Scholar database using advanced search operators to combine a defined set of keywords. Among the architectures found, the “multi-post” solution and the “8-support” solution are the two most commonly chosen classes. Additionally, a recurrent pattern for the supporting system of superconducting cavities has been identified. The choice of architecture can be correlated with the characteristics of the superconducting element being supported, such as its mass, length, and stiffness. Furthermore, the review provides a conceptual analysis of the possibility of extending these designs to the unconventional environment of rotating machines.

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“…A number of systems between 435 MHz (10.5 T) [23] and 500 MHz (11.7 T) [24] are also being installed. Some of the challenges of designing coil arrays at higher frequencies may be overcome with a better theoretical understanding of capacitive coupling.…”

mentioning

confidence: 99%

Stray Capacitance Between Magnetic Resonance Imaging Coil Elements: Models and Application to Array Decoupling

Maunder

Daneshmand

Mousavi

et al. 2013

IEEE Trans. Microwave Theory Techn.

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The role of capacitive coupling between RF coil elements of MRI arrays is studied extensively in this paper and comprehensive models are obtained. At higher MRI frequencies, capacitive coupling greatly impacts coil coupling and therefore cannot be neglected. We compare lumped and distributed capacitance models and show that they correctly predict impedance variations due to stray and intentional mutual capacitance. The distributed model takes into account the dispersed nature of the mutual impedance, and it is more accurate than the lumped model. The value of stray capacitance obtained by fitting simulated results is shown to depend strongly on substrate and phantom permittivity, while being mostly invariant to changes in frequency. A novel result of this investigation is a method of completely eliminating mutual impedance between adjacent coils, including the mutual resistance. Until recently it was believed that only mutual reactance could be eliminated with lossless passive circuits. The SNR performance of two and four coil arrays with varying degrees of coupling is compared, showing that there is no SNR degradation when the mutual resistance is eliminated in addition to mutual reactance. This result has applications in arrays used in transmission, where mutual resistance leads to losses that degrade transmit efficiency.

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Latest Progress on the Iseult/INUMAC Whole Body 11.7 T MRI Magnet

Cited by 9 publications

References 6 publications

Iseult/INUMAC 11.7 T Conductor Production Status

Iseult/INUMAC 11.7 T Conductor Production Status

Literature Review of Suspension Systems for Superconducting Elements

Stray Capacitance Between Magnetic Resonance Imaging Coil Elements: Models and Application to Array Decoupling

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