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Rare earth doped niobium material for radio frequency superconducting cavity and preparation method thereof

A radio-frequency superconducting cavity and rare earth doping technology, which is applied in the coating process of metal materials, heating by discharge, coating, etc., can solve problems such as long time, difficult process technology, and not knowing whether there is a problem with the texture

Inactive Publication Date: 2013-11-20
赵夔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacturing and molding of thin-film superconducting cavities is difficult in technology, and it is not known whether there are problems with the texture of large-area thin-film molding
It is an indisputable fact in the accelerator industry that the research on thin film superconducting cavities will take a long time

Method used

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  • Rare earth doped niobium material for radio frequency superconducting cavity and preparation method thereof
  • Rare earth doped niobium material for radio frequency superconducting cavity and preparation method thereof
  • Rare earth doped niobium material for radio frequency superconducting cavity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1) Select high-purity niobium sheets of different widths so that they are stacked together with a gap in them to form a semi-cylindrical body, with a diameter of 115mm, a length of 240mm, and a mass of 10.8kg;

[0040] 2) Evenly add 26g of pure scandium into the gap between the niobium sheets, and make a semi-cylindrical consumable electrode by electron beam welding;

[0041] 3) Place the consumable electrode in a vacuum electric arc furnace and melt it under the protection of argon to obtain a niobium ingot doped with scandium;

[0042] 4) Machining to remove defects of poor crystallization on the surface, and forging into slabs;

[0043] 5) Anneal the slab at 800°C for 2 hours in an annealing furnace;

[0044] 6) Rolling and slicing the slab to obtain niobium-doped slabs;

[0045] 7) Use an annealing furnace to anneal the niobium-doped plate at 800°C for half an hour to obtain a niobium material containing 0.5% scandium.

Embodiment 2

[0047] 1) Select high-purity niobium sheets of different widths so that they are stacked together with a gap in them to form a semi-cylindrical body, with a diameter of 115mm, a length of 240mm, and a mass of 10.8kg;

[0048] 2) Evenly add 1.5g of pure yttrium into the gap between the niobium sheets, and make a semi-cylindrical consumable electrode by electron beam welding;

[0049] 3) Place the consumable electrode in a vacuum electric arc furnace and melt it under the protection of argon to obtain a niobium ingot doped with yttrium;

[0050] 4) Machining to remove defects of poor crystallization on the surface, and forging into slabs;

[0051] 5) Anneal the slab at 700°C for 5 hours in an annealing furnace;

[0052] 6) Rolling and slicing the slab to obtain niobium-doped slabs;

[0053] 7) Use an annealing furnace to anneal the niobium-doped plate at 1200°C for 5 hours to obtain a niobium material containing 0.01% yttrium.

Embodiment 3

[0055] 1) Perform buffer chemical polishing on the 2.8mm thick high-purity niobium plate;

[0056] 2) Use SRIM software to calculate the energy and dose of incident scandium ions, and determine that the dose of 100keV energy is 6.0×10 14 / cm -2 , the dose of 300keV energy is 1.1×10 14 / cm -2 , the dose of 500keV energy is 1.4×10 14 / cm -2 , so that the content of scandium atoms in the surface layer of the niobium plate is 0.5%;

[0057] 3) According to the above calculation results, use an ion accelerator or an ion implanter to implant scandium ions with corresponding energy and dose into the niobium plate;

[0058] 4) Anneal the implanted niobium plate at 1200°C for half an hour in an annealing furnace;

[0059] 5) Measure the depth distribution of scandium ions in niobium materials by RBS method;

[0060] 6) Use buffer chemical polishing to remove a 50nm thin layer on the surface of the niobium material to obtain a niobium material containing 0.5% scandium.

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Abstract

The invention relates to a rare earth doped niobium material for a radio frequency superconducting cavity, belonging to the technical field of superconducting accelerators. The rare earth doped niobium material is a high-purity niobium material doped with a scandium or yttrium element, and the atomic ratio content range of the doped scandium or yttrium is 0.01%-0.5%. The preparation method comprises a smelting doping way or an ion injection way. In the rare earth doped niobium material prepared by the smelting doping way, impurity atoms can be uniformly distributed in the niobium material; and in the rare earth doped niobium material prepared by the ion injection way, the impurity atoms can be only distributed in a 500nm range of the surface layer of the niobium material. The niobium material disclosed by the invention can reduce the electron mean free path of the material and improve. According to the invention, the electron mean free path of the niobium material disclosed by the invention can be reduced and a lower critical magnetic field and an upper critical magnetic field can be improved. The radio frequency superconducting cavity prepared by the material has a higher quenching magnetic field and can work under a higher magnetic field and provide a higher acceleration electric field. A smelting doping method disclosed by the invention is relatively simple, and the preparation speed is high. By adopting an ion injection method, the doping content is easy to control, and the using quantity of the scandium or the yttrium is also saved.

Description

technical field [0001] The invention belongs to the technical field of superconducting accelerators, and in particular relates to the improvement and improvement of the performance of superconducting cavities using type II superconductor niobium. The method of doping rare earth elements scandium and yttrium can significantly improve the magnetic properties of pure niobium materials in the low-temperature superconducting state. The superconducting cavity prepared with this new niobium-based material doped with scandium and yttrium has excellent performance. Background technique [0002] Since the 1970s, after more than 30 years of hard work, the application of radio frequency superconducting technology in the field of accelerators has achieved "brilliant" achievements. Superconducting accelerators have excellent acceleration performance, especially when operating in continuous wave mode, they can maintain a high acceleration gradient. important part of the device. The Inte...

Claims

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Application Information

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IPC IPC(8): C22C27/02C22C1/02C23C10/00C23C14/48H05B7/20
Inventor 赵夔焦飞江涛赵红运陆真冀
Owner 赵夔
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