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摘要
A new method for precise setting of the spinning angle to the magic angle by using a saddle coil is described. The coil, which is referred to as an X-0 shim coil, is wound to produce a uniform static magnetic field B-x perpendicular to the main magnetic field B-0. The magnetic field felt by a sample is a vector sum of the main field B-0 and the transverse field B-x produced by the X-0 shim coil. Hence the angle between the spinner axis and the effective magnetic field can be controlled by current I supplied to the X-0 shim coil, leading to precise angle adjustment without backlash accompanied with a mechanical system conventionally used. It is shown that the angle range achieved is +/- 0.05 degrees for I = +/- 5 A at B-0 = 7 T.
- 出版日期2015-7
