700兆赫低温/高温超导核磁共振磁体的研制：测试结果及空间均匀性改善
Development of a 700 MHz low-/high- temperature superconductor nuclear magnetic resonance magnet: test results and spatial homogeneity improvement.
作者信息
Hahn S, Bascuñán J, Lee H, Bobrov E S, Kim W, Iwasa Y
机构信息
Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
出版信息
Rev Sci Instrum. 2008 Feb;79(2 Pt 1):026105. doi: 10.1063/1.2838587.
For the first time in nuclear magnetic resonance (NMR) magnet development, a magnet configuration comprising an insert wound with high-temperature superconductor (HTS) and a background-field magnet wound with low-temperature superconductor (LTS) has been proven viable for NMR magnets. This new LTS/HTS magnet configuration opens the way for development of 1 GHz and above NMR magnets. Specifically, a 700 MHz LTS/HTS NMR magnet (LH700), consisting of a 600 MHz LTS magnet (L600) and a 100 MHz HTS insert (H100), has been designed, built, and successfully tested, and its magnetic field characteristics were measured and analyzed. A field homogeneity of 172 ppm in a cylindrical mapping volume of 17 mm diameter by 30 mm long was measured at 692 MHz and corresponding 1H NMR signal with 1.9 kHz half-width was captured. Two techniques, room-temperature and ferromagnetic shimming, were analytically examined to investigate if they would be effective for further improving spatial field homogeneity of the LH700.
在核磁共振（NMR）磁体的发展历程中，一种由高温超导（HTS）绕组插入件和低温超导（LTS）绕组背景场磁体组成的磁体结构首次被证明可用于NMR磁体。这种新型的LTS/HTS磁体结构为1GHz及以上的NMR磁体开发开辟了道路。具体而言，已设计、制造并成功测试了一台700MHz的LTS/HTS NMR磁体（LH700），它由一台600MHz的LTS磁体（L600）和一个100MHz的HTS插入件（H100）组成，并对其磁场特性进行了测量和分析。在直径17mm、长30mm的圆柱形测绘体积内，于692MHz时测得场均匀度为172ppm，并捕获了具有1.9kHz半高宽的相应1H NMR信号。对室温匀场和铁磁匀场这两种技术进行了分析研究，以探讨它们是否能有效进一步提高LH700的空间场均匀度。
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