Design and Cooling Properties of High Stable Field REBCO Superconducting Magnet for MRI

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Abstract
Research and development for the practical application of a med-ical-use magnetic resonance imaging system (MRI) superconduct-ing magnet that does not require liquid helium started as the New Energy and Industrial Technology Development Organization's (NEDO) supported project in fiscal 2016. Development of a liquid helium-free medical MRI superconducting magnet has been de-sired. Another purpose is to reduce the size and weight of high magnetic field magnets. By using the high temperature supercon-ducting coil, it is possible to make the 3T magnet of the same shape, weight, leakage magnetic field as 1.5T magnet. In this pro-ject, we are developing a half size active shield-type 3T REBCO coil for MRI. This magnet has active shield coils with a maximum diameter of 1200 mm, and its room bore diameter is 480 mm. This magnet is one of the world's largest magnets using a REB-CO wire with an accumulated energy of 1.6 MJ at the rated mag-netic field. It generates a magnetic field of high homogeneity and stability necessary for imaging. In this paper, we report the half-size active shield-type 3T coil and its cooling system that can re-duce the initial cooling time.
Funding Information
  • New Energy and Industrial Technology Development Organization
  • HTS magnet system
  • HTS practical application

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