AC Loss Measurement in Nb₃Sn Coil for a New Fast Switching-field MR Concept Magnet

Area of Science:

• Medical Physics
• Biophysics
• Materials Science

Background:

• Magnetic Resonance (MR) imaging and spectroscopy benefit from variable magnetic field strengths.
• Current methods for multi-field MR are cumbersome, involving pulsed currents or specimen transport.
• High magnetic fields improve signal-to-noise ratio (SNR) and enable measurement of specific spins.

Purpose of the Study:

• To propose a novel, practical design for a fast switching-field MR magnet.
• To develop a liquid-helium-free system for rapid magnetic field alteration (≤ 1 second).
• To assess the feasibility of this technology for live animal and human imaging.

Main Methods:

• Design of a novel fast switching-field MR magnet.
• Utilizing two types of Niobium-3-Tin (Nb3Sn) wire.
• Measurement of AC loss and analysis of magnet characteristics using an electrical method.

Main Results:

• The proposed magnet design facilitates rapid switching between significantly different magnetic field strengths within 1 second.
• Niobium-3-Tin (Nb3Sn) wire was selected, and its AC loss characteristics were analyzed.
• The study provides a foundation for a practical, liquid-helium-free switching-field MR system.

Conclusions:

• The developed fast switching-field MR magnet design is a promising advancement for MR technology.
• This liquid-helium-free approach offers a more practical solution for multi-field MR applications.
• The technology has the potential to expand contrast parameter options and improve SNR in future MR imaging.