Iron-based thin film superconducting cavity and preparation method thereof

An iron-based superconducting and superconducting cavity technology, applied in ion implantation plating, coating, electrical components and other directions, can solve the problem that the acceleration gradient of the thin film superconducting cavity cannot be further improved, and achieve the improvement of the working magnetic field and acceleration gradient. , Improve the effect of accelerating gradient

Inactive Publication Date: 2019-07-23
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the acceleration gradient of the thin-film superconducting cavity cannot be further improved, thereby providing an iron-based thin-film superconducting cavity and its preparation method

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  • Iron-based thin film superconducting cavity and preparation method thereof

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Embodiment 1

[0044] This embodiment provides an iron-based thin film superconducting cavity, including a niobium superconducting cavity, an aluminum oxide insulating layer, and an iron-based superconducting layer; the iron-based superconducting layer includes Ba(Fe 0.9 co 0.1 ) 2 As 2 , type 122;

[0045] The thickness of the iron-based superconducting layer is 300nm; the thickness of the insulating layer is 15nm;

[0046] The preparation method of the above-mentioned iron-based superconducting cavity,

[0047] Will Al 2 o 3and Ba(Fe 0.9 co 0.1 ) 2 As 2 The iron-based superconducting target is placed in the pulsed laser epitaxy cavity, and the vacuum is evacuated to 1×10 -7 Pa, adjust the oxygen pressure in the niobium cavity to 1×10 after vacuuming -2 Pa, temperature is 300°C, laser energy is 1J / cm 2 , depositing 10nm Al on the surface of the niobium cavity 2 o 3 Thin film, the deposition rate is 0.3nm / min, after the deposition is completed, the vacuum of the niobium cavity ...

Embodiment 2

[0049] This embodiment provides an iron-based thin film superconducting cavity, including a niobium superconducting cavity, an aluminum oxide insulating layer, and an iron-based superconducting layer; the iron-based superconducting layer includes Fe 0.5 Te 0.5 layer (type 11) and Ba(Fe 0.9 co 0.1 ) 2 As 2 layer (Type 122), the Fe 0.5 Te 0.5 layer and the Ba(Fe 0.9 co 0.1 ) 2 As 2 The thickness ratio of the layers is 3:2;

[0050] The thickness of the iron-based superconducting layer is 500nm; the thickness of the insulating layer is 10nm;

[0051] The preparation method of the above-mentioned iron-based superconducting cavity,

[0052] Will Al 2 o 3 , Fe 0.5 Te 0.5 (Type 11) and Ba(Fe 0.9 co 0.1 ) 2 As 2 (Type 122) iron-based superconducting target is placed in the pulsed laser epitaxy cavity, and vacuumed to 1×10 -7 Pa, adjust the oxygen pressure in the niobium cavity to 1×10 after vacuuming -2 Pa, temperature is 500°C, laser energy is 1J / cm 2 , and then...

Embodiment 3

[0054] This embodiment provides an iron-based thin film superconducting cavity, including a niobium superconducting cavity, a magnesium oxide insulating layer, and an iron-based superconducting layer; the iron-based superconducting layer includes FeSe 0.5 Te 0.5 layer (type 11), LaFeAsO layer (type 1111) and BaFe 2 (As 0.8 P 0.2 ) 2 Layer (type 122,) the thickness ratio of the three layers is 1:25:25;

[0055] The thickness of the iron-based superconducting layer is 1020nm; the thickness of the insulating layer is 20nm;

[0056] The preparation method of the above-mentioned iron-based superconducting cavity,

[0057] MgO and FeSe 0.5 Te 0.5 , LaFeAsO and BaFe 2 (As 0.8 P 0.2 ) 2 Put the iron-based superconducting layer target into the magnetron sputtering chamber, and evacuate to 1×10 -7 Pa, after the vacuum is exhausted, argon gas is introduced until the pressure is 1Pa, and the temperature in the niobium cavity is adjusted to 300°C, then the temperature in the ni...

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Abstract

The invention belongs to the technical field of superconducting cavity preparation, and particularly relates to an iron-based thin film superconducting cavity and a preparation method thereof. The iron-based thin film superconducting cavity comprises a superconducting cavity body, an insulating layer and at least one iron-based superconducting layer, and belongs to a superconducting cavity with anSIS structure; and the iron-based superconducting layer can shield an external magnetic field, reduce a surface magnetic field of niobium, and improve a thermodynamic critical field and accelerationgradient of the iron-based thin film superconducting cavity. An iron-based superconductor has higher transition temperature, an overheat field, and wider working temperature, and is beneficial to improving the magnetic field and the acceleration gradient of the iron-based superconductor layer; when two or more iron-based superconducting layers are used, the magnetic field can be shielded by the iron-based superconducting layers for multiple times, so that the magnetic field and the acceleration gradient of the iron-based thin film superconducting cavity are improved accordingly.

Description

technical field [0001] The invention belongs to the technical field of superconducting cavity preparation, and in particular relates to an iron-based thin film superconducting cavity and a preparation method thereof. Background technique [0002] The radio frequency superconducting accelerating cavity has the advantages of low heat loss, easy to optimize the cavity shape, high electrical conversion efficiency, and low material cost. It can be applied to particle accelerators on a large scale. It is suitable for accelerating charged particle beams in continuous wave mode and has high beam currents. stability. Superconducting cavities have been used in various large-scale accelerators and light source devices, such as storage rings, free electron lasers, high-current accelerators, and high-energy accelerators. [0003] The ideal superconducting material used as a radio frequency superconducting accelerating cavity should have low surface resistance, high critical temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/28C23C14/06C23C14/08H05H7/20
CPCC23C14/06C23C14/0617C23C14/0623C23C14/081C23C14/28C23C14/352H05H7/20
Inventor 徐中堂马衍伟樊帆
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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