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Coil node voltage output for superconducting magnets

A technology of superconducting magnets and superconducting coils, used in superconducting magnets/coils, magnetic objects, measuring current/voltage, etc., can solve problems such as inability to obtain, and achieve the effect of high-speed real-time fine measurement

Active Publication Date: 2016-04-20
SIEMENS HEALTHCARE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] in the Figure 5 After attenuation in the manner shown, since the real signal Vout≈Vin / 1000 derived from this small voltage is submerged in electrical and thermal noise of similar magnitude and also appears in the attenuated voltage Vout used for the measurement, this information is not available

Method used

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  • Coil node voltage output for superconducting magnets
  • Coil node voltage output for superconducting magnets
  • Coil node voltage output for superconducting magnets

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Embodiment Construction

[0016] The present invention provides a means for providing signals containing unattenuated low noise small voltages obtained from the individual coils forming a superconducting magnet to extract these signals from a cryogenic chamber while attenuating any potential present in the signal Any high voltage from the coil, such as that generated during quenching.

[0017] In an embodiment of the present invention, by applying the coil node voltage to be measured to the input terminal of a series resistor R1 (for example, about 100kΩ), and setting a second Resistor R2, the second resistor R2 is located outside the cryogen container, thereby achieving the object of the present invention. Preferably, on the superconducting magnet structure, the series resistor R1 is mounted in close proximity to the coil node. By setting the second resistor R2 outside the cryogen container, the attenuation ratio of the obtained voltage divider can be selected by the user according to the required am...

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Abstract

The invention discloses a superconducting magnet assembly comprising a plurality of superconducting coils connected in series and accommodated in a cryogenic chamber, including coil nodes located between two electrically adjacent coils. The coil nodes provide the input voltage. A coil node voltage output terminal is provided comprising: a series resistor connected between the coil node and another node; a non-linear element connected between the other node and a ground voltage; and an output connector connected to the other node Electrically connected, and across the boundary (18) of the cryobox.

Description

technical field [0001] The present invention relates to a superconducting magnet assembly. Background technique [0002] Superconducting magnets, such as those used in magnetic resonance imaging (MRI) systems to generate a uniform background magnetic field, typically consist of several discrete coils electrically connected in series. The magnet structure is housed in a cryobox that keeps the magnets cooled to the temperature at which the coils superconduct. In many magnets, the coils are contained within a cryogen vessel that is partially filled with liquid cryogen and partially filled with gaseous cryogen. [0003] In order to measure the quench voltage and diagnose which coil or which segment of a coil quenches first, it is desirable to have electrical access to each coil junction. Known systems are provided with simple electrical connections from inter-coil nodes to simple high voltage lead-throughs, arranged to conduct voltages up to several thousand volts outside the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F6/06G01R19/00
CPCG01R15/04H01F6/02H02H7/001
Inventor H.A.布雷克斯
Owner SIEMENS HEALTHCARE LTD