Cylindrical spinner and speed controller for magic angle spinning nuclear magnetic resonance
作者:
James N. Lee,
D. W. Alderman,
Jiang Yi Jin,
Kurt W. Zilm,
Charles L. Mayne,
Ronald J. Pugmire,
David M. Grant,
期刊:
Review of Scientific Instruments
(AIP Available online 1984)
卷期:
Volume 55,
issue 4
页码: 516-520
ISSN:0034-6748
年代: 1984
DOI:10.1063/1.1137783
出版商: AIP
数据来源: AIP
摘要:
A new design for a cylindrical spinner suitable for magic angle spinning nuclear magnetic resonance (NMR) is described. The rotor has a large sample volume (0.66 cm3) and is capable of spinning speeds from 500 Hz to 5 kHz at drive gas pressures below 50 lb/in.2. The rotor is completely supported by gas bearings. Axial positioning is provided by the rotor’s T shape, leaving the bottom surface available for a photoelectric tachometer. The coil is wrapped on a form machined into the outer surface of the stator, producing a high filling factor. Also described is an instrument which controls the spinning speed of such a rotor to ±0.6 Hz around a set speed in the range of 3–4 kHz. The rotor’s speed is determined by means of a photoelectric tachometer. The instrument then compares this measured speed to the desired value and adjusts the gas flow to the rotor to correct any difference.
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