Operation of a 130-MHz/9-mm Compact HTS Annulus Magnet With a Micro-NMR Probe.
Operation of a 130-MHz/9-mm Compact HTS Annulus Magnet With a Micro-NMR Probe.
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使用微型 NMR 探头操作 130 MHz/9 mm 紧凑型 HTS 环形磁铁。
DOI：
10.1109/tasc.2014.2367658
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Iwasa,Yukikazu
中科院分区：
文献类型：
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作者：
Hahn,Seungyong;Kim,Youngjae;Song,Jungbin;Voccio,JohnP;Chu,Yong;Bascuñán,Juan;Tomita,Masaru;Iwasa,Yukikazu
本文报道了YP 2800小型环形核磁共振磁体在4.2K液氦浴中与自制微型核磁共振探针的最终运行结果。YP 2800由2800个YBCO“板环”堆叠而成，厚度为0.08 mm，为46 mm或40 mm正方形，每个板环中心加工有一个26 mm的孔。通过场冷技术，YP 2800在130 MHz（3.05 T）下通电，在场冷后3天内达到11 ppm/h的场漂移时，测得的总峰-峰均匀性为487 ppm。由于孔径较小（9.2 mm），没有商业探头可以安装到孔中;设计并构建了8.5 mm微型NMR探头。本文介绍了YP 2800微探针的基本结构和设计特点，给出了该探针在基频为130 MHz、半峰宽为60 kHz时，对4.4 mm和5 mm长的二甲基亚砜样品的核磁共振信号的测量结果，其中461 ppm的频率杂质主要是由于空间场误差引起的，487 ppm的目标空间。
In this paper, we report final operation results of our compact annulus NMR magnet, named YP2800, with a homemade micro-NMR probe in a bath of liquid helium at 4.2 K. YP2800 comprises of a stack of 2800 YBCO “plate annuli,” 0.08 mm thick, either 46 mm or 40 mm square, each having a 26-mm hole machined at the center. By the field-cooling technique, YP2800 was energized at 130 MHz (3.05 T); an overall peak-to-peak homogeneity of 487 ppm withinwas measured at a moment when a field drift of 11 ppm/h was reached in three days after field cooling. Due to a small (9.2 mm) bore size, no commercial probes could fit into the bore; an 8.5-mm micro-NMR probe was designed and constructed. Following a general description of YP2800 and design construction details of the micro probe, this paper presents NMR signals captured by the probe for a dimethyl sulfoxide sample of4.4 and 5 mm long at a base frequency of 130 MHz with a half-peak width of 60 kHz; the corresponding frequency impurity of 461 ppm is chiefly due to a spatial field error, i.e., 487 ppm in the target space.