Journal ArticleDOI
Construction and Operation of Cryogen Free ${\hbox{MgB}}_{2}$ Magnets for Open MRI Systems
M. Razeti,S. Angius,L. Bertora,D. Damiani,R. Marabotto,M. Modica,Davide Nardelli,M. Perrella,M. Tassisto +8 more
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TLDR
In this article, the thermal and electromagnetic characterization and the achieved targets of the first prototype, evaluated on a long term activity period, are reported and a comparison with the previous ones.Abstract:
Following a dedicated R&D program, ASG Superconductors has recently developed techniques for designing and constructing open cryogen free MRI magnets, refrigerated by two double stage cryocoolers only. The magnet consists of two coils both made with six double pancakes, each double pancake being obtained reacting and winding 1600 m of multifilamentary, copper-stabilized MgB2 tape supplied by Columbus Superconductors. Here we report the thermal and electromagnetic characterization and the achieved targets of the first prototype, evaluated on a long term activity period. The MRI images, acquired starting from November 2006, further demonstrate the accomplishment of remarkable magnet performances. In parallel to the long term tests on the first prototype, ASG Superconductors has designed and constructed a second MRI magnet with improved characteristics. We present here the related test results and a comparison with the previous ones.read more
Citations
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Journal ArticleDOI
Novel technologies and configurations of superconducting magnets for MRI
TL;DR: A review of non-traditional approaches and emerging trends in superconducting magnets for MRI is presented, including the largest 11.7?T Iseult magnet, and advanced cryogenics approaches with an emphasis on low-volume helium systems, including hermetically sealed self-contained cryostats requiring no user intervention, are presented.
Journal ArticleDOI
Development of a superconducting bulk magnet for NMR and MRI.
Takashi Nakamura,Daiki Tamada,Yousuke Yanagi,Yoshitaka Itoh,Takahiro Nemoto,Hiroaki Utumi,Katsumi Kose +6 more
TL;DR: It is concluded that the cryogen-free superconducting bulk magnet developed in this study is useful for high-resolution desktop NMR, MRI and mobile NMR device.
Journal ArticleDOI
Conduction cooled magnet design for 1.5 T, 3.0 T and 7.0 T MRI systems
TL;DR: In this article, electromagnetic designs for conduction cooled main magnets over the range of medium field strengths (1.5 T) to ultra high field strength (7.0 T) are presented.
Journal ArticleDOI
Low-temperature synthesis of MgB2 superconductors
Zongqing Ma,Yongchang Liu +1 more
TL;DR: In this paper, a low-temperature synthesized MgB2 exhibits improved Jc due to the increases in both the grain connectivity and flux pinning, and minor metal or alloy additions are proved to be the main contributors.
Journal ArticleDOI
A persistent-mode 0.5 T solid-nitrogen-cooled MgB2 magnet for MRI.
Jiayin Ling,Jiayin Ling,John P. Voccio,John P. Voccio,Seungyong Hahn,Seungyong Hahn,Timing Qu,Timing Qu,Juan Bascunan,Yukikazu Iwasa +9 more
TL;DR: Persistent-current switches were successfully operated in solid nitrogen for ramping the magnet and were also designed to absorb magnetic energy in a protection mechanism; its effectiveness was evaluated in an induced quench.
References
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Journal ArticleDOI
Design, Construction and Tests of MgB2 Coils for the Development of a Cryogen Free Magnet
M. Modica,S. Angius,L. Bertora,D. Damiani,M. Marabotto,Davide Nardelli,M. Perrella,M. Razeti,M. Tassisto +8 more
TL;DR: In this article, a double pancake coil was produced by winding a single length of MgB2, 1600 m long, multifilamentary stabilized tape, and tested in a cryogen free apparatus.
Journal ArticleDOI
The behaviour of cryogen-free MgB2 react and wind coils
Riccardo Musenich,Pasquale Fabbricatore,Stefania Farinon,M. Greco,M. Modica,R. Marabotto,R. Penco,Marco Razeti,Davide Nardelli +8 more
TL;DR: In this article, several magnesium diboride coils were constructed and successfully tested in cryogen-free systems, achieving current values up to 320 A for react and wind pancake coils, whose behaviour is described in the paper.
Journal ArticleDOI
Recent Development of ${\rm MgB}_{2}$ -Based Large Scale Applications
R.. Penco,G.. Grasso +1 more
TL;DR: In the past two years since the last ASC 2004 conference, a substantial improvement was made in the manufacture and use of Magnesium Diboride conductors as discussed by the authors, and many km of conductors were already produced throughout the world and it is now possible to deeply think about a convenient industrial production of this conductor, as it is already possible to purchase it in reasonable lengths on the free market.
Patent
Superconducting composite wire made from magnesium diboride
TL;DR: In this article, a superconducting composite wire with the phase of magnesium diboride is described, where at least one layer of metal chemically compatible with the conductive metal core is applied to the composite wire.
Journal ArticleDOI
Behavior of $rm MgB_2$ Reacted and Wound Coils From 14 K to 32 K in a Cryogen Free Apparatus
M. Modica,G. Grasso,M. Greco,R. Marabotto,Riccardo Musenich,Davide Nardelli,R. Penco,M. Tassisto +7 more
TL;DR: In this article, the behavior of MgB2 reacted and wound pancakes, made with Columbus Superconductors' tape, at several temperatures in a cryogen free apparatus was studied.