Cryogenics Around the 11.7 T MRI Iseult Magnet

Brédy, P.; Belorgey, J.; Chesny, Ph.; Hervieu, B.; Lannou, H.; Juster, F.P.; Abdel-Maksoud, Walid; Mayri, C.; Molinié, F.; Payn, A.

doi:10.1109/tasc.2010.2040160

Cited by 22 publications

(11 citation statements)

References 3 publications

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“…For this test only 2/3 of the total pumping capacity has been used, meaning that an additional pumping capacity of 2000 l/s on the saturated LHe bath will be available for the operation of the hybrid magnet outsert. The inset photographs show some examples of saturated bath HeII heat exchangers realised by CEA-Saclay for SEHT [9] and ISEULT [10], which are similar to the one developed for the Grenoble hybrid magnet cryogenics.…”

Section: Obtaining Both Pumped and Pressurized Superfluid He Bathsmentioning

confidence: 95%

“…The pressurized superfluid He at 1.8 K, 1200 hPa used to cool the superconducting magnet in its He vessel is obtained from a Claudet bath [8] located inside a cryogenic satellite, which is deported center to center to about 8 m from the magnet cryostat via a 5.5 m long cryogenic line (figure 1) in a reduced stray magnetic field region of 10 mT at maximum. The design of this satellite is closed to the ones initially developed for the SEHT test station at CEA-Saclay [9] and for the NMR magnet ISEULT of the NEUROSPIN Center in Saclay [10]. Among main differences, the LNCMI cryogenic satellite contains a 1.5 m 3 cold buffer maintained at 10 K large enough to recover about 60 % of the 1100 liters of pressurized liquid helium contained in the helium vessel in case of a magnet quench.…”

Section: Overview Of the Cryogenicsmentioning

confidence: 99%

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43+T Grenoble hybrid magnet: Commissioning tests of the current leads and cryogenic satellite producing the pressurized superfluid He at 1.8 K

Pugnat

Barbier

Berriaud

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The Grenoble Hybrid magnet is a modular platform using resistive and superconducting technologies to produce various continuous high magnetic field and flux configurations for the scientific community. They range from 43 T in 34 mm diameter with 24 MW electrical power to 9 T in 800 mm diameter when the superconducting coil is used alone. Thanks to the ongoing upgrade of the electrical power installation of LNCMI-Grenoble up to 30 MW and possibly to 36 MW, the possibility to increase the total field up to 45-46 T in the near future is foresee and deeply studied. The key design parameters will be briefly recalled including the specifically developed Nb-Ti/Cu conductor, the large bore outsert superconducting coil, the magnet cryostat with its structure including the eddy-current shield, the cryogenic line for the interconnection with the cryogenic satellite and the fully dedicated 150 l/h He liquefaction plant. All components of the hybrid magnet platform have been built, tested and delivered to LNCMI-Grenoble, where integration and assembly are ongoing. The status of the project will be given with focus to the recent commissioning tests of the cryogenic satellite producing the pressurized superfluid He at 1.8 K as well as to the successful powering tests of the specially developed current leads at ultimate current and under fully degraded cooling conditions simulating the worst-case accidental scenario.

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Section: Obtaining Both Pumped and Pressurized Superfluid He Bathsmentioning

confidence: 95%

Section: Overview Of the Cryogenicsmentioning

confidence: 99%

43+T Grenoble hybrid magnet: Commissioning tests of the current leads and cryogenic satellite producing the pressurized superfluid He at 1.8 K

Pugnat

Barbier

Berriaud

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The cryogenic system [4], [5] is designed to cool down and maintain the coil operating conditions (21 W @ 1.8 K; 0.125 MPa and 610 W @ 55 K) for highly reliable and continuous operation (24 h a day and 365 days a year). Some equipment has been already installed; specifically transfer lines for nitrogen and helium, storage tanks, helium gasometer, compressors and pumping units.…”

Section: A Cryogenics Procurement and Installationmentioning

confidence: 99%

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

Védrine

Maksoud

Aubert

et al. 2012

IEEE Trans. Appl. Supercond.

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The Whole Body 11.7 T MRI Magnet is an actively shielded magnet system, with a stored energy of 338 MJ and an inductance of 308 H. Operating at a homogeneous field level of 11.75 T within a 90 cm warm bore, the cryostat has external dimensions of 4.8 m in diameter and 5.0 m in length. It is part of the Iseult/Inumac project, a French-German initiative focused on very-high-magnetic-field molecular imaging to improve sensitivity, spatial, temporal, and spectral resolution for preclinical and/or clinical MR systems. After the qualification of two first unit lengths of 820 m, the NbTi conductor with a current of 1483 A is now being produced at Luvata Waterbury. Winding of the main coil, made of 170 double pancakes, is starting at Alstom Belfort. Several pieces of equipment have already been delivered to the Neurospin site, CEA Saclay,; including the main refrigerator produced by Air Liquide. Several prototypes have been tested and confirmed the soundness of the magnet design. This paper describes the 11.7 T magnet and the latest progress in its design and fabrication.

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“…A sub-atmospheric (16 hPa) Helium boiling bath transfers by conduction cold power to the pressurised bath (0.125 MPa) which is stratified from 4.4K, 0.125MPa to 1.8K, as represented on FIGURE 3. A first test facility developed for the Iseult R&D program has shown the relevance of this design [4]. Then, the cold power is transferred through the heat pipe (taking advantage of the very high thermal conductivity of superfluid helium) to the satellite cryostat, with any cryogenic equipment installed on the magnet cryostat.…”

Section: Nominal Modementioning

confidence: 99%

The cryogenic system for NEUROSPIN laboratory: Main features and Refrigerator commissioning

Crispel¹,

Brédy²,

Gratiot³

et al. 2012

AIP Conference Proceedings

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NEUROSPIN, a CEA Life Science Division laboratory located in Saclay, France, uses superconducting magnets for MRI applications. The aim of this lab, unique imaging platform in Europe, is to study the central nervous system. Several superconducting magnets will be operated, among which a 11.75 T magnet (Collaboration between Siemens healthcare and CEA within the framework of the french-german project Iseult/INUMAC, supported in part by Oséo, a public and autonomous establishment created by the French governement) [1] which needs 1.8K refrigeration, and specific thermal shielding.AIR LIQUIDE DTA was in charge of the design and manufacturing of a specific Helium Refrigerator dedicated to this application. This system, based on a HELIAL Evolution refrigeration system, HELIAL MF, has to be able to provide in nominal configuration simultaneously refrigeration power at 4.5K (to compensate heat losses), liquefaction rate (to supply 1.8K refrigeration system with liquid helium) and refrigeration power at 50K (shielding of the magnet).The Refrigeration system has been completed and tested successfully at AIR LIQUIDE Factory at the end of 2010.The aim of this paper is to present the main technical features of the overall cryogenic system and the main results of the commissioning phase of the refrigerator.

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Cryogenics Around the 11.7 T MRI Iseult Magnet

Cited by 22 publications

References 3 publications

43+T Grenoble hybrid magnet: Commissioning tests of the current leads and cryogenic satellite producing the pressurized superfluid He at 1.8 K

43+T Grenoble hybrid magnet: Commissioning tests of the current leads and cryogenic satellite producing the pressurized superfluid He at 1.8 K

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

The cryogenic system for NEUROSPIN laboratory: Main features and Refrigerator commissioning

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