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Title: A 4-Tesla superconducting whole-body magnet for MR imaging and spectroscopy

Abstract

Since January 87 a 4 tesla MR magnet with a 1.25 m diameter warm bore is in operation at the Siemens Research Laboratories. The magnet weighing 10 tons is part of a whole-body MR device devoted to in-vivo research studies at magnetic fields significantly higher than 2 tesla; the highest field strength presently used in standard MR whole-body systems. The stored energy of the adiabatically stable six-coil system is 39 MJ at 4 tesla. The rated current is 376 A. Superconducting and resistive shim-coils together with iron shims reduce the bare magnet inhomogeneity of 100 ppm down to less than 5 ppm in a 50 cm diameter spherical volume. The magnet operates in persistent mode with the current leads retracted. The field drift is less than 3 x 10/sup -8//h. A small helium refrigerator is used to cool both the two radiation shields of the cryostat and the current leads and to reliquify the evaporating helium gas. Results of coil design, analysis of forces and stresses, quench protection, cryostat design and magnet operation are reported.

Authors:
; ;
Publication Date:
Research Org.:
Siemens AG, Research Labs., Paul-Gossen-Str. 100, D-8520 Erlangen (DE)
OSTI Identifier:
6356492
Report Number(s):
CONF-870901-
Journal ID: CODEN: IEMGA; TRN: 89-007247
Resource Type:
Conference
Journal Name:
IEEE Trans. Magn.; (United States)
Additional Journal Information:
Journal Volume: 24:2; Conference: 10. international conference on magnet technology (MT-10), Boston, MA, USA, 21 Sep 1987
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; NUCLEAR MAGNETIC RESONANCE; SUPERCONDUCTING MAGNETS; DESIGN; CRYOSTATS; HELIUM; QUENCHING; SPECTROSCOPY; CONTROL EQUIPMENT; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; ELEMENTS; EQUIPMENT; FLUIDS; GASES; MAGNETIC RESONANCE; MAGNETS; NONMETALS; RARE GASES; RESONANCE; SUPERCONDUCTING DEVICES; THERMOSTATS; 420201* - Engineering- Cryogenic Equipment & Devices

Citation Formats

Vetter, J, Ries, G, and Reichert, T. A 4-Tesla superconducting whole-body magnet for MR imaging and spectroscopy. United States: N. p., 1988. Web.
Vetter, J, Ries, G, & Reichert, T. A 4-Tesla superconducting whole-body magnet for MR imaging and spectroscopy. United States.
Vetter, J, Ries, G, and Reichert, T. 1988. "A 4-Tesla superconducting whole-body magnet for MR imaging and spectroscopy". United States.
@article{osti_6356492,
title = {A 4-Tesla superconducting whole-body magnet for MR imaging and spectroscopy},
author = {Vetter, J and Ries, G and Reichert, T},
abstractNote = {Since January 87 a 4 tesla MR magnet with a 1.25 m diameter warm bore is in operation at the Siemens Research Laboratories. The magnet weighing 10 tons is part of a whole-body MR device devoted to in-vivo research studies at magnetic fields significantly higher than 2 tesla; the highest field strength presently used in standard MR whole-body systems. The stored energy of the adiabatically stable six-coil system is 39 MJ at 4 tesla. The rated current is 376 A. Superconducting and resistive shim-coils together with iron shims reduce the bare magnet inhomogeneity of 100 ppm down to less than 5 ppm in a 50 cm diameter spherical volume. The magnet operates in persistent mode with the current leads retracted. The field drift is less than 3 x 10/sup -8//h. A small helium refrigerator is used to cool both the two radiation shields of the cryostat and the current leads and to reliquify the evaporating helium gas. Results of coil design, analysis of forces and stresses, quench protection, cryostat design and magnet operation are reported.},
doi = {},
url = {https://www.osti.gov/biblio/6356492}, journal = {IEEE Trans. Magn.; (United States)},
number = ,
volume = 24:2,
place = {United States},
year = {Tue Mar 01 00:00:00 EST 1988},
month = {Tue Mar 01 00:00:00 EST 1988}
}

Conference:
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