Accelerating gradient improvement in nitrogen-doped superconducting radio-frequency cavities for SHINE

Zong, Y.; Chen, J.F.; Wang, D.; Chen, Q.X.; Chen, Z.X.; Cheng, C.H.; Dong, P.C.; Hou, H.T.; Huang, X.; Huang, Y.W.; Pu, X.Y.; Ouyang, X.H.; Shi, J.; Sun, S.; Xia, R.Z; Xing, S.; Wang, Z.; Wu, J.N.; Wu, X.W.; Zhai, Y.F.; Zhao, S.J.; Zhao, Y.L.

doi:10.1016/j.nima.2023.168724

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…A pre-treatment process was carried out before coating in order to obtain a smooth inner surface, which involved electropolishing (EP) at around 150 µm, baking at 900 • C for 3 h, a final EP of 20 µm, and high-pressure rinsing (HPR) with ultra-pure water. The entire pre-treatment process was completed at the Wuxi platform [10] before being transported to Shanghai for vertical testing. The 2 K vertical test results of the two EP-baseline cavities are shown in Figure 4, where the maximum accelerating gradients of both cavities exceed 28 MV/m, with a quality factor higher than 1 × 10 10 at 26 MV/m, indicating that they have qualified inner surfaces for coating.…”

Section: Preparation Of the Coated Cavitiesmentioning

confidence: 99%

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First Results of Nb3Sn Coated Cavity by Vapor Diffusion Method at SARI

Chen,

Zong,

Wang

et al. 2024

Coatings

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Nb3Sn is emerging as one of the focal points in superconducting radio frequency (SRF) research, owing to its excellent superconducting properties. These properties hold significant possibilities for cost reduction and the miniaturization of accelerators. In this paper, we report the recent efforts of the Shanghai Advanced Research Institute (SARI) in fabricating high-performance Nb3Sn superconducting cavities using the vapor diffusion method. This includes the construction of a Nb3Sn coating system with dual evaporators and the test results of 1.3 GHz single-cell coated cavities. The coated samples were characterized, and the growth state of the Nb3Sn films was analyzed. The first coated superconducting cavity was tested at both 4.4 K and 2 K, with different cooldown rates passing through the Nb3Sn critical temperatures. The causes of Sn droplet spot defect formation on the surface of the first cavity were analyzed, and such defects were eliminated in the coating of the second cavity by controlling the evaporation rate. This study provides a reference for the preparation of high-performance Nb3Sn-coated cavities using the vapor diffusion method, including the setup of the coating system, the comprehension of the vapor diffusion process, and the test conditions.

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Section: Preparation Of the Coated Cavitiesmentioning

confidence: 99%

“…Currently, most SRF cavities utilize pure niobium as material [8,9]. With advancements in manufacturing and surface treatment technologies, the performance of the niobium cavity has approached its theoretical limits [10][11][12][13]. Consequently, there is a growing focus on exploring new generations of SRF materials.…”

Section: Introductionmentioning

confidence: 99%

First Results of Nb3Sn Coated Cavity by Vapor Diffusion Method at SARI

Chen,

Zong,

Wang

et al. 2024

Coatings

Self Cite

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Investigation of Electropolishing for High-Gradient 1.3 GHz and 3.9 GHz Niobium Cavities

Zong,

Chen,

Wang

et al. 2024

Materials

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Electropolishing (EP) has become a standard procedure for treating the inner surfaces of superconducting radio-frequency (SRF) cavities composed of pure niobium. In this study, a new EP facility was employed for the surface treatment of both 1.3 GHz and 3.9 GHz single-cell cavities at the Wuxi Platform. The stable “cold EP” mode was successfully implemented on this newly designed EP facility. By integrating the cold EP process with a two-step baking approach, a maximum accelerating gradient exceeding 40 MV/m was achieved in 1.3 GHz single-cell cavities. Additionally, an update to this EP facility involved the design of a special cathode system for small-aperture structures, facilitating the cold EP process for 3.9 GHz single-cell cavities. Ultimately, a maximum accelerating gradient exceeding 25 MV/m was attained in the 3.9 GHz single-cell cavities after undergoing the cold EP treatment. The design and commissioning of the EP device, as well as the electropolishing and vertical test results of the single-cell cavities, will be detailed herein. These methods and experiences are also transferable to multi-cell cavities and elliptical cavities of other frequencies.

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Accelerating gradient improvement in nitrogen-doped superconducting radio-frequency cavities for SHINE

Cited by 2 publications

References 15 publications

First Results of Nb3Sn Coated Cavity by Vapor Diffusion Method at SARI

First Results of Nb3Sn Coated Cavity by Vapor Diffusion Method at SARI

Investigation of Electropolishing for High-Gradient 1.3 GHz and 3.9 GHz Niobium Cavities

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