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

Conference · Tue Mar 01 00:00:00 EST 1988 · IEEE Trans. Magn.; (United States)

OSTI ID:6356492

Vetter, J; Ries, G; Reichert, T

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.

• Research Organization: Siemens AG, Research Labs., Paul-Gossen-Str. 100, D-8520 Erlangen (DE)
• OSTI ID: 6356492
• Report Number(s): CONF-870901-; TRN: 89-007247
• Journal Information: IEEE Trans. Magn.; (United States), Vol. 24:2; Conference: 10. international conference on magnet technology (MT-10), Boston, MA, USA, 21 Sep 1987
• Country of Publication: United States
• Language: English

Related Subjects

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