This document is a technical specification for a magnet system. It mainly introduces the composition, features and performance of the magnet system.
This document provides technical specifications for the MRBR 7.0/210 system, a complete superconducting magnet system intended primarily for research studies on the biological applications of NMR imaging (MRI) and NMR spectroscopy (MRS). The system consists of a highly homogeneous actively shielded superconducting 7 Tesla magnet housed in a horizontal room temperature bore cryostat.
The document details the specifications for the superconducting magnet, including field homogeneity and fringe field data, as well as the superconducting shim coils used for field correction. It also covers the cryostat dimensions, cryogen volumes, and lists standard ancillary parts included with the system.
| Central field | 7.0 Tesla |
|---|---|
| Operating current | 300 Amps |
| Field stability | Less than 0.05 ppm/hour |
| Field homogeneity (fully shimmed) | Less than 30ppm over 10cm dsv |
| Typical time to energise | 180 mins |
| Length of cryostat | > 1280mm |
| Weight of cryostat | 2900kg |
| Hold-time during normal operation | More than 90 days |
The system is intended primarily for research studies on the biological applications of NMR imaging (MRI) and NMR spectroscopy (MRS).
The magnet is wound from multi-filamentary NbTi conductor with a high percentage of copper to superconductor.
The maximum recommended current for the shim coils is 25 Amps.
The helium reservoir contains in total approximately 750 litres of liquid helium.