公开(公告)号：US20170370970A1

公开(公告)日：2017-12-28

申请号：US15635664

申请日：2017-06-28

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： George A. Levin ,  Paul N. Barnes ,  Charles C. Rong

IPC: G01R15/20 ,  G01R19/00

CPC classification number: G01R15/207 ,  G01R19/0092 ,  G01R33/1238 ,  G01R33/1246

Abstract: A method of measuring superconducting critical current in persistent mode using superconducting closed loops which allow the persistent current to flow without any joints. This persistent critical current is different than traditional resistive critical current that is the upper limit of the superconducting current carrying capacity, and provides the information about the range of critical current in persistent mode that is more close to applications in MRI, SMES, and Maglev operations. The measurement can be used as a quality control method in the manufacturing process and a piece of crucial information to magnet manufacturers for the design and fabrication of magnet. The superconducting materials include the second generation superconducting wires (coated conductors) based on Rare Earth (RE) Barium Copper Oxide superconducting material (REBa2Cu3O6+x, REBCO), or any other type of superconducting wires that can be manufactured in the form of tape.

公开(公告)号：US10401393B2

公开(公告)日：2019-09-03

申请号：US15635664

申请日：2017-06-28

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： George A. Levin ,  Paul N. Barnes ,  Charles C. Rong

IPC: G01R15/20 ,  G01R19/00 ,  G01R33/12

Abstract: A method of measuring superconducting critical current in persistent mode using superconducting closed loops which allow the persistent current to flow without any joints. This persistent critical current is different than traditional resistive critical current that is the upper limit of the superconducting current carrying capacity, and provides the information about the range of critical current in persistent mode that is more close to applications in MRI, SMES, and Maglev operations. The measurement can be used as a quality control method in the manufacturing process and a piece of crucial information to magnet manufacturers for the design and fabrication of magnet. The superconducting materials include the second generation superconducting wires (coated conductors) based on Rare Earth (RE) Barium Copper Oxide superconducting material (REBa2Cu3O6+x, REBCO), or any other type of superconducting wires that can be manufactured in the form of tape.

公开(公告)号：US20170040095A1

公开(公告)日：2017-02-09

申请号：US14819933

申请日：2015-08-06

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： George A. Levin ,  Paul N. Barnes ,  Charles C. Rong

IPC: H01F7/20 ,  H01F6/06 ,  C22C29/12 ,  H01F7/06

CPC classification number: C22C29/12 ,  H01F6/006

Abstract: Provided are devices for inducing a current in a closed loop superconducting material including a magnetic field source housed within a coil former substantially coaxial with the magnetic field source, and a base optionally in physical contact with a support tube. A closed loop superconducting material is held in a loop position by the coil former and the base such that current passing through the magnetic field source will produce a current in the superconducting material by induction. By a process of modified current sweep reversal, the rate of relaxation may be reduced in the superconducting material relative to the absence of a reversal.

Abstract translation: 提供了用于在闭环超导材料中感应电流的装置，包括容纳在与磁场源基本同轴的线圈架内的磁场源，以及任选地与支撑管物理接触的基座。 闭环超导材料通过线圈架和基座保持在环路位置，使得通过磁场源的电流将通过感应在超导材料中产生电流。 通过改进的电流扫掠反转的过程，相对于不存在反转，超导材料的弛豫速率可能会降低。