CN-121983416-A - Magnet framework structure of niobium three-tin type superconducting undulator and magnet winding method

CN121983416ACN 121983416 ACN121983416 ACN 121983416ACN-121983416-A

Abstract

The invention discloses a magnet skeleton structure of a niobium three-tin superconducting undulator and a magnet winding method. The magnet framework structure comprises an iron core framework and a reversing wheel, wherein a plurality of winding grooves are formed in the iron core framework, the reversing wheel is vertically arranged at the upper end of a reversing side baffle plate of each winding groove and used for changing the winding direction of niobium-tin superconducting wires in adjacent winding grooves, and a wire inlet guide groove and a wire outlet guide groove are formed in one side wall of the reversing side baffle plate and used for supporting the niobium-tin superconducting wires to enter and exit the winding grooves. The winding method comprises the steps that the niobium three-tin superconducting wire enters the inlet wire guide groove of the ith winding groove of the magnet framework structure, after the winding is completed, the niobium three-tin superconducting wire enters the inlet wire guide groove of the (i) winding groove through the outlet wire guide groove of the ith winding groove, enters the inlet wire guide groove of the (i+1) winding groove for winding, and the number of winding layers of the niobium three-tin superconducting wire in each winding groove is an even number. The invention protects the niobium three-tin wire as much as possible and solves the reversing problem.

Inventors

GUO QING
YANG XIANGCHEN
YANG CONGLAI
LI YUHUI
LI XIAOYU
CHEN ZILIN
ZHANG XIANGZHEN

Assignees

中国科学院高能物理研究所

Dates

Publication Date: 20260505
Application Date: 20260303

Claims (10)

1. The magnet skeleton structure of the niobium three-tin type superconducting undulator is characterized by comprising an iron core skeleton and a reversing wheel; A plurality of winding grooves are formed in the iron core framework; the reversing wheel is vertically arranged at the upper end of the reversing side baffle of the winding groove and is used for changing the winding direction of the niobium three-tin superconducting wire in the adjacent winding groove; An incoming line guide groove and an outgoing line guide groove are formed in one side wall of the reversing side baffle plate and used for supporting the niobium three-tin superconducting wire to enter and exit the winding groove.
2. The magnet framework structure according to claim 1, wherein the outer contour of the iron core framework is of a runway type, the reversing side baffles comprise A-type reversing side baffles and B-type reversing side baffles, reversing side baffle slots are formed in each runway on the back surface of the iron core framework and used for integrating the reversing side baffles, side baffle slots are formed in each runway on the side surface of the iron core framework and used for integrating the side baffles, the A-type reversing side baffles and the B-type reversing side baffles are alternately arranged on the reversing side baffle slots, the magnetic poles are arranged on the top surface of the iron core framework at positions corresponding to the reversing side baffle slots, and each winding slot is formed in a space between adjacent runways.
3. The magnet frame structure according to claim 2, wherein the A-type reversing side baffle and the B-type reversing side baffle of each winding groove are provided with a reversing wheel, and the reversing wheel is perpendicular to the A-type reversing side baffle and the B-type reversing side baffle of the winding groove.
4. The magnet frame structure according to claim 2, wherein the inlet wire guide grooves and the outlet wire guide grooves on the a-type reversing side baffle and the B-type reversing side baffle are arranged reversely in the horizontal direction.
5. The magnet frame structure of claim 1, wherein the reversing wheels on adjacent winding slots are oppositely disposed.
6. The magnet frame structure of claim 1, wherein the reversing side guards, and reversing wheels are all stainless steel.
7. The magnet armature structure of claim 1, wherein the core armature is further provided with a wire-in reversing wheel for introducing a niobium tri-tin superconducting wire into a first wire-winding slot of the core armature.
8. The magnet frame structure according to claim 1, wherein the edge of the reversing wheel is a boss structure, and the radius of the boss structure is larger than that of the reversing wheel, so as to prevent the niobium-three-tin superconducting wire from falling off in the reversing process.
9. A magnet coiling method of a niobium three-tin superconducting undulator comprises the following steps: after the niobium three-tin superconducting wire enters the wire inlet guide groove of the ith wire slot of the magnet framework structure in claim 1 and is wound, the niobium three-tin superconducting wire enters the wire inlet guide groove of the (i+1) th wire slot through the wire outlet guide groove of the ith wire slot to be wound until each wire slot is wound, wherein i=1-N, N is the total number of the wire slots; The number of winding layers of the niobium three-tin superconducting wire in each winding groove is an even number.
10. The method of claim 9, wherein the first and last turns of niobium tri-tin superconducting wire in the winding slot are each on the same side of the winding slot.

Description

Magnet framework structure of niobium three-tin type superconducting undulator and magnet winding method Technical Field The invention belongs to the technical field of low-temperature superconduction of accelerators, and relates to a magnet framework structure of a niobium three-tin superconducting undulator and a magnet winding method. Background An undulator is a magnet device that provides a periodic sine or cosine magnetic field. The charged particles moving at high speed emit synchronous radiation while undergoing torsional pendulum motion under the action of lorentz force when passing through the periodic magnetic field. Thus, undulators are one of the key devices for providing radiated light based on storage ring accelerators and linac advanced light sources. A superconducting undulator belongs to electromagnetic undulators. When the superconducting undulator works under the low-temperature condition, compared with the normal-temperature electromagnetic undulator and the permanent-magnet undulator, the superconducting undulator has remarkable advantages in the aspect of improving the magnetic field intensity, and is a hot spot research direction in the technical field of the current undulators. The superconducting undulator adopts a superconducting wire having high current carrying capacity, such as niobium titanium, niobium tri-tin, etc., and a magnet of the superconducting undulator is constituted by periodically winding the superconducting wire on an iron core bobbin. Under low temperature conditions, the magnet is powered to generate periodic sine or cosine magnetic fields in the working magnetic gap. For the undulator, the period length is relatively short, the magnetic poles are narrow, and a vertical winding mode is generally adopted, namely, a superconducting wire is wound around an iron core framework, and the axis of a wound coil is parallel to the beam motion direction. In view of the demand for such a winding mechanism, the core skeleton serves as a supporting structure having equally spaced winding slots with a gap of half the cycle length. In addition, in order to form a sine or cosine magnetic field, the winding directions of coils in two adjacent wire slots of the magnet need to be reversed, and the opposite current directions of coils in any two adjacent wire slots can be realized in the electrified state. Under the action of current, the magnetic poles in the vertical direction are magnetized, so that a magnetic field in the vertical direction is generated and periodically distributed in the beam direction in a sine or cosine manner. Therefore, how to realize the structure and the winding method with the opposite winding directions of coils in any two adjacent winding slots by means of the design of the iron core framework is a key for developing the magnet of the superconducting undulator. The current carrying capacity of niobium tri-tin superconducting wire is higher than that of niobium titanium superconducting wire, and it is expected that a magnet for winding an undulator will achieve a higher magnetic field, which is also the type of superconducting wire to be used in the present invention. The wire is very sensitive to strain. During winding, the critical current density of the winding can drop sharply along with the increase of internal strain, and even irreversible mechanical damage such as microcracks can occur. As such, niobium tri-tin superconducting wires are used to wind undulator magnets, the bend radius of which is selected to be much tighter than niobium titanium wires, and generally much larger than the bend radius of niobium titanium. Therefore, the reversing and winding mechanism suitable for the niobium-titanium type superconducting undulator cannot be directly applied to the niobium-three-tin type superconducting undulator, and special design is needed. The conventional solution is a technical solution with the aid of vertical reversing wheels, in which the vertical reversing wheels are designed on the side of a reversing side screen, in a winding slot. The axis of the vertical reversing wheel is parallel to the axis of the coil and parallel to the beam moving direction. In the scheme of the reversing wheel in the prior art, although the problem of difficult reversing of the short-period superconducting undulator is solved, the bending radius of the reversing wheel is limited by the depth of the wire slot because the reversing wheel is positioned in the wire slot, and the vertical reversing wheel with a larger bending radius cannot be designed. While niobium tri-tin wire is wound with a design structure requiring a larger bend radius. This is one of the reasons why prior art solutions are not suitable for winding niobium tri-tin superconducting undulator magnets. In a low-temperature state, the niobium three-tin superconducting wire has higher current carrying capacity compared with the niobium titanium superconducting wire, and is expected to further improve