Readily accessible deep cooled nmr shim assembly

A uniform magnetic field and thermal contact technology, applied in the direction of measuring devices, superconducting magnets/coils, instruments, etc., can solve problems such as changes in the uniformity of the magnetic field, and achieve the effects of multiple degrees of freedom, easy calculation, and simple production

Active Publication Date: 2017-06-27
BRUKER SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Unfortunately, however, this seemingly ideal solution has major disadvantages which the authors of JP 3737636 B2 have conspicuously neglected: namely, that the nitrogen tank moves when the nitrogen filling height changes, and with the i

Method used

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  • Readily accessible deep cooled nmr shim assembly
  • Readily accessible deep cooled nmr shim assembly
  • Readily accessible deep cooled nmr shim assembly

Examples

Experimental program
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Embodiment Construction

[0054] figure 1 A schematic vertical section through a radial half of a magnet arrangement according to the invention is shown, wherein the field shaping device P is fixed to the bottom of the helium tank by a support tube P0. The superconducting magnet coil system C is mechanically rigidly connected to the bottom of the He tank H1. For example, the support pipe P0 can be screwed or glued to the bottom of the He tank. However, a screw connection is more advantageous because it can be released again. The field shaping means P may be welded or glued to the support pipe P0. Bayonet connectors are also possible. Alternatively, the field shaping device P may be clamped between two support tubes.

[0055] exist figure 2 The support tube P0 and the field shaping device P before assembly are shown in . In this example, the field shaper P is a cylinder with cutouts A .

[0056] image 3 A schematic vertical cross-section through a radial half of a magnet arrangement according ...

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PUM

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Abstract

The invention provides a magnet arrangement in an NMR apparatus comprising a superconducting magnetic coil system (C) for producing a homogeneous one with a He container (H1) having liquid helium and a He inner tube (H), the magnetic coil system being mechanically rigidly connected to the He container , Wherein a radiation shield with a radiation shield inner tube (S) surrounds the He container at a distance for reducing the evaporation rate of the liquid helium, and wherein a field shaping device (P) made of magnetic material for shimming the homogeneous magnetic field is arranged in the space between the he inner tube and the radiation shield inner tube , Is characterized in that the field-shaping device is fixed in the space between the he inner tube and the radiation shield inner tube in such a way that it is in a rigid mechanical contact with the He container without touching the radiation shield inner tube.The field shaping device can be installed in the cryostats so that it does not move relative to the superconducting coils. The He container does not have to be opened for work on the field-shaping device and a decomposition of the cryostat is avoided.

Description

technical field [0001] The invention relates to a magnet arrangement in an NMR (Nuclear Magnetic Resonance) apparatus having a superconducting magnet coil system for generating a uniform magnetic field along the z-axis direction, wherein the superconducting magnet coil system is arranged in a In the He tank of the He tube, the inner He tube in operation contains liquid helium for cooling the coil and is mechanically rigidly connected to the He tank with the radiation shielding device having the inner radiation shielding tube at a distance enclosing the He tank in order to reduce the evaporation rate of liquid helium, and a field shaping device composed of soft magnetic material is arranged in the space between the inner He tube and the inner radiation shielding tube in order to adjust the uniform magnetic field (i.e. shimming). [0002] Such a device is disclosed in JP 3737636 B2. Background technique [0003] The fields of application of superconducting magnet systems inc...

Claims

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Application Information

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IPC IPC(8): H01F6/00H01F6/04G01R33/3815
CPCG01R33/3815H01F6/00H01F6/04G01R33/3873G01R33/3804
Inventor B·格罗斯尼克劳斯G·屈布勒P-A·博菲尔
Owner BRUKER SWITZERLAND AG
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