Voltage wire for REBCO superconducting coils wrapped with metal reinforcement layers

Abstract

The present invention discloses a voltage wire suitable for use with a metal-reinforced REBCO superconducting coil. This wire relates to the field of applied superconducting technology and comprises, arranged from top to bottom, a first polyimide tape, a Hastelloy alloy strip, and a second polyimide tape. The Hastelloy alloy strip is used to communicate the voltage signal between the superconducting coil and the nanovoltmeter; the first polyimide tape and the second polyimide tape are used to insulate the Hastelloy alloy strip. This invention overcomes the drawbacks of copper wire in superconducting coils wrapped with metal reinforcement layers, meets the requirements for measuring coil voltage signals, and enables accurate measurement of coil voltage signals.

Description

Technical Field

[0001] The present invention relates to the field of applied superconducting technology, in particular to a voltage line suitable for a REBCO superconducting coil wrapped with a metal reinforcement layer. Background Art

[0002] With the advancement of second-generation high-temperature superconducting tape and magnet manufacturing technology, REBCO high-temperature superconducting tape-based interposer coils are finding increasing application in high-magnetic field applications. REBCO superconducting coils must be excited within the background magnetic field provided by a low-temperature superconducting magnet to generate a higher field strength. Given the significant Lorentz force experienced by the coils when current flows, multiple layers of Hastelloy alloy are required around the coils to provide enhanced protection.

[0003] Obtaining timely signal feedback from each coil during current flow is crucial for stable magnet operation. Potential wires are used to measure voltage signals in superconducting magnets operating in cryogenic environments. Currently, thin, insulated copper wires are often used in engineering projects to measure coil signals. However, to protect the coils, the copper wires are continuously squeezed during the process of wrapping the Hastelloy reinforcement around the coils. This thin copper wire has low overall mechanical properties, leading to performance degradation, insulation wear, and even the loss of the copper wire welded to the REBCO strip.

[0004] Therefore, it is an urgent problem for technical personnel in this field to propose a voltage wire suitable for REBCO superconducting coils wrapped with metal reinforcement layers to solve the application defects of copper wires in superconducting coils wrapped with metal reinforcement layers, meet the coil voltage signal measurement requirements, and achieve accurate measurement of the coil voltage signal. Summary of the Invention

[0005] In view of this, the present invention provides a voltage wire suitable for REBCO superconducting coils wrapped with metal reinforcement layers, which overcomes the application defects of copper wire in superconducting coils wrapped with metal reinforcement layers, meets the coil voltage signal measurement requirements, and realizes accurate measurement of the coil voltage signal.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A voltage line suitable for a REBCO superconducting coil wrapped with a metal reinforcement layer, comprising a first polyimide tape, a Hastelloy alloy strip, and a second polyimide tape arranged in sequence from top to bottom;

[0008] The Hastelloy alloy strip is used to connect the voltage signal between the superconducting coil and the nanovoltmeter;

[0009] The first polyimide tape and the second polyimide tape are used to insulate the Harbin alloy strip.

[0010] Optionally, the widths of the first polyimide tape and the second polyimide tape are both greater than the width of the Hastelloy alloy strip, so that the Hastelloy alloy strip is completely insulated.

[0011] Optionally, the lengths of the first polyimide tape and the second polyimide tape are both shorter than the length of the Hastelloy alloy strip, and exposed areas are left at both ends of the Hastelloy alloy strip for welding on the surface of the REBCO superconducting coil.

[0012] Optionally, the exposed areas at both ends of the Hastelloy alloy strip are provided with a tin-plated layer for welding with the REBCO superconducting strip.

[0013] Optionally, the tin plating layer is made of PbSn tin material.

[0014] Optionally, the temperature for soldering is maintained at 200±10°C.

[0015] Optionally, the width and length of the Hastelloy alloy strip can be adjusted to accommodate specifications of different coils and bobbins.

[0016] As can be seen from the above technical solution, compared with the prior art, the present invention provides a voltage line suitable for REBCO superconducting coils wrapped with metal reinforcement layers: 1) The new potential line invented based on Hastelloy alloy has low resistivity, low preparation cost, reliable mechanical properties, and can well meet the requirements of low-temperature experimental testing; 2) The specifications of the Hastelloy alloy strip in the potential line can be adjusted for different superconducting coils and bobbin sizes, which is easy to operate; 3) It is of great significance for signal acquisition and measurement of REBCO superconducting coils wrapped with metal reinforcement layers, and to a certain extent promotes the application of REBCO superconducting coils under strong magnetic conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of a voltage line structure of a REBCO superconducting coil wrapped with a metal reinforcement layer provided by the present invention;

[0019] Figure 2A schematic diagram of the voltage wire welding and overall structure of the REBCO superconducting coil wrapped with a metal reinforcement layer provided by the present invention;

[0020] In the figure, 1-voltage line, 11-first polyimide tape, 12-Hastelloy strip, 13-second polyimide tape, 2-REBCO non-insulated pancake coil, 3-coil skeleton, 4-Hastelloy reinforcement layer. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Reference Figure 1 As shown, the present invention discloses a voltage line suitable for a REBCO superconducting coil wrapped with a metal reinforcement layer, comprising a first polyimide tape 11, a Hastelloy alloy strip 12, and a second polyimide tape 13 arranged in sequence from top to bottom;

[0023] Hastelloy strip 12, used for connecting the voltage signal between the superconducting coil and the nanovoltmeter;

[0024] The first polyimide tape 11 and the second polyimide tape 13 are used to perform insulation treatment on the Harbin alloy strip 12 .

[0025] Furthermore, the widths of the first polyimide tape 11 and the second polyimide tape 13 are both greater than the width of the Hastelloy alloy strip 12 , so that the Hastelloy alloy strip 12 is completely insulated.

[0026] Specifically, the first polyimide tape 11 and the second polyimide tape 13 wrap the Hastelloy strip 12 .

[0027] Furthermore, the lengths of the first polyimide tape 11 and the second polyimide tape 13 are both shorter than the length of the Hastelloy alloy strip 12 , and exposed areas are left at both ends of the Hastelloy alloy strip 12 for welding on the surface of the REBCO superconducting coil.

[0028] Furthermore, the exposed areas at both ends of the Hastelloy strip 12 are provided with a tin coating for welding with the REBCO superconducting strip.

[0029] Furthermore, the material of the tin plating layer is PbSn tin material.

[0030] Furthermore, the temperature for performing soldering is maintained at 200±10°C.

[0031] Furthermore, the width and length of the Hastelloy alloy strip 12 can be adjusted to accommodate the specifications of different coils and bobbins.

[0032] See also Figure 2 As shown, the present invention also discloses a schematic diagram of the voltage line welding and overall structure of a metal-reinforced REBCO superconducting coil. After the REBCO superconducting coil is assembled, the voltage line 1 (defined as a new potential line) suitable for metal-reinforced REBCO superconducting coils wrapped with metal reinforcement layers of the present invention needs to be welded to the outermost strip of the REBCO non-insulated pancake coil 2 to measure the voltage signal of the REBCO non-insulated pancake coil 2 under working conditions and ensure the stable operation of the REBCO non-insulated pancake coil 2. After the new potential line 1 is welded, to ensure the stable operation of the REBCO non-insulated pancake coil 2 under huge electromagnetic forces, a Hastelloy alloy reinforcement layer 4 needs to be wound around the outer layer of the REBCO non-insulated pancake coil 2 to provide protection.

[0033] Based on existing Hastelloy alloy strip specifications, the length and width of the Hastelloy alloy strip can be cut to the required size according to specific experimental requirements. The appropriately sized Hastelloy alloy strip is insulated using polyimide tape. Specifically, polyimide tape, wider than the Hastelloy alloy strip itself, is applied to both sides of the Hastelloy alloy strip. The polyimide tape is connected and sealed along the width of the strip. A partially exposed area is left at both ends of the Hastelloy alloy strip along the length to facilitate subsequent welding.

[0034] After the new potential wire 1 is prepared, it is welded to the REBCO non-insulated pancake coil 2. First, the exposed area of ​​Hastelloy 12 at the end of the potential wire and the outermost strip of the REBCO non-insulated pancake coil 2 are tinned. After the tinning is completed, welding is performed, and the welding temperature is maintained at about 200°C.

[0035] The above description of the disclosed embodiments is presented in an incremental manner to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is to be construed in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A voltage line suitable for a REBCO superconducting coil wrapped with a metal reinforcement layer, characterized in that: It includes a first polyimide tape, a Hastelloy alloy strip and a second polyimide tape arranged in sequence from top to bottom; The Hastelloy alloy strip is used to connect the voltage signal between the superconducting coil and the nanovoltmeter; The first polyimide tape and the second polyimide tape are used to insulate the Hastelloy alloy strip; The width and length of the Hastelloy alloy strip can be adjusted to suit the specifications of different coils and bobbins; The widths of the first polyimide tape and the second polyimide tape are both greater than the width of the Hastelloy alloy strip, so that the Hastelloy alloy strip is completely insulated; The lengths of the first polyimide tape and the second polyimide tape are both shorter than the length of the Hastelloy alloy strip, and exposed areas are left at both ends of the Hastelloy alloy strip for welding on the surface of the REBCO superconducting coil; The exposed areas at both ends of the Hastelloy alloy strip are provided with a tin-plated layer for welding with the REBCO superconducting strip; The material of the tin plating layer is PbSn tin material; The temperature for soldering is maintained at 200±10℃.

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