National Institute for Materials Science

Jeol Resonance Inc.

Shinobu Ohki

Tadashi Shimizu

Hideyuki Shinagawa

Takahiro Nemoto

Katsuya Hioka

Eijiro Baba

An NMR probe has a sample tube insertion port for introducing and withdrawing the sample tube into and from the probe, a sample tube support providing support of the sample tube during NMR measurements, a tubular sample tube passage connecting together the sample tube insertion port and the sample tube support and capable of transporting the sample tube between them, and a gas stream generator for producing a gas stream in the sample tube passage to move the sample tube between the sample tube insertion port and the tube support. The gas stream generator is mounted at an intermediate (non-end) position in the sample tube passage.

NMR probe

A shimming device sequentially records a history of conducted shim setting, momentarily dynamically calculates compensation values corresponding to the record by the aid of a characteristic function, and dynamically controls the shim coil by the aid of the compensation values thus obtained, to thereby compensate magnetic field fluctuation of a superconducting magnet which is attributable to the setting of the shim, and stabilizes the magnetic field in an NMR superconducting magnet. This device includes a shim setting recorder () that records a set value of the shim, a type of set operation, the operation amount of the setting, and a time at which the setting is conducted, in association with each other for each setting; generating compensation function supply () that supplies a generating compensation function that is a function having the type of the operation, the operation amount, and the amount of time as factors, and is set so as to approximately compensate a magnetic field fluctuation attributable to individual setting; compensation value computer () that refers to the generating compensation function supply () and the shim setting recorder (), computes a compensation value at the time t by the aid of a compensation function that is configured by, and outputs the computation result; a shim coil driver () that drives the shim coil () by the aid of a sum of the compensation value obtained by the compensation value computer (), and a latest set value.

Shimming device for superconducting magnet

Growing community of inventors

Ibaraki, Japan

Shinobu Ohki