Opposed coil magnet calculations for large sample and unilateral nuclear‐magnetic resonance
作者:
Alan R. Rath,
Stephen B. W. Roeder,
Eiichi Fukushima,
期刊:
Review of Scientific Instruments
(AIP Available online 1985)
卷期:
Volume 56,
issue 3
页码: 402-410
ISSN:0034-6748
年代: 1985
DOI:10.1063/1.1138312
出版商: AIP
数据来源: AIP
摘要:
A magnet configuration has been devised, consisting of two nested coaxial coils with the current in the inner coil circulating in an opposite sense from that in the outer coil. The magnetic field generated by such an opposed pair exhibits a small region of homogeneity outside of the magnet itself, creating the possibility of constructing a unilateral nuclear‐magnetic‐resonance device capable of examining an object from only one side. Calculations on one special case, the inside‐out Helmholtz configuration, indicate a volume of 10 cm3with homogeneity of ±1% for a coil of outer radius 10 cm, and 0.1 cm3with 100‐ppm homogeneity. A second special case, consisting of two sets of opposed solenoids arranged in a quasi‐Helmholtz manner, offers homogeneity comparable to a conventional Helmholtz pair of similar diameter but with an increase in separation of as much as a factor of 2.
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