中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Transverse-pressure susceptibility of high-J(c) RRP and PIT types of Nb3Sn Rutherford cables for accelerator magnets

文献类型:期刊论文

作者Gao, P.1,2; Dhalle, M.1; Bordini, B.3; Ballarino, A.3; Ten Kate, H. H. J.1
刊名SUPERCONDUCTOR SCIENCE & TECHNOLOGY
出版日期2020-12-01
卷号33
ISSN号0953-2048
关键词RRP and PIT Nb3Sn wire Rutherford cable transverse pressure critical current degradation
DOI10.1088/1361-6668/abb8ec
通讯作者Gao, P.(phdgaop@gmail.com)
英文摘要In the frame of the High-Luminosity Large Hadron Collider construction and Future Circular Collider development program, the magnetic field in the accelerator dipole magnets is being enhanced to 11 T, and 15 T to 16 T level, respectively. Advanced Nb3Sn superconductors with a non-copper critical current density exceeding 2500 A mm(-2) at 4.2 K and 12 T, are being developed using the Restacked-Rod-Process (RRP) and Powder-In-Tube (PIT) wire technologies. However, since Nb3Sn is extremely brittle, it is a significant challenge to construct the high-field dipole magnets with such very strain-susceptible superconductor. The high-level of stress acting on the wide face of the Rutherford cables in the coils of 120 MPa to 200 MPa generated by the Lorenz' force, causes initially a reversible reduction and eventually at some stress level followed by permanent degradation of the critical current when strain goes to high. This study sets out to examine the critical current and upper critical field performance of state-of-the-art RRP and PIT Nb3Sn Rutherford cables in terms of transverse pressure. The variation of the critical current and upper critical field due to the thermal- and mechanical load-cycling was investigated as well. For reference, the critical current of witness wires characterized on standard ITER type barrels were also measured. The results indicate that the RRP type of Nb3Sn Rutherford cables, when fully impregnated with epoxy resin, are able to withstand a transverse stress of 170 MPa to 250 MPa without noticeable irreversible critical current reduction. For the transverse pressure limit for present PIT type of Nb3Sn Rutherford cables somewhat lower values are found at the level of 50 MPa to 120 MPa. Therefore, given the present cables, the high-field dipole magnet construction can be realized using the RRP Nb3Sn Rutherford cables, while for PIT type cables more cable development is requested to enhance the onset of irreversible degradation. The reversible critical current reduction in RRP type of cables of 10% at 150 MPa to 250 MPa needs to be taken into account when predicting magnet performance. Finally, extreme care needs to be taken into account for Nb3Sn coil fabrication, since the experimental results show significant critical current reduction due to stress concentrations already at 0.2 degrees misalignment angles between the pressure applying surface and the surface of the impregnated cable.
WOS关键词CONDUCTOR DEVELOPMENT ; BORE ; SENSITIVITY ; STRESS ; OXFORD
资助项目European Commission ; European Union[654305]
WOS研究方向Physics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000584892800001
资助机构European Commission ; European Union
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/105194]  
专题中国科学院合肥物质科学研究院
通讯作者Gao, P.
作者单位1.Univ Twente, POB 217, NL-7500 AE Enschede, Netherlands
2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
3.CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland
推荐引用方式
GB/T 7714
Gao, P.,Dhalle, M.,Bordini, B.,et al. Transverse-pressure susceptibility of high-J(c) RRP and PIT types of Nb3Sn Rutherford cables for accelerator magnets[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY,2020,33.
APA Gao, P.,Dhalle, M.,Bordini, B.,Ballarino, A.,&Ten Kate, H. H. J..(2020).Transverse-pressure susceptibility of high-J(c) RRP and PIT types of Nb3Sn Rutherford cables for accelerator magnets.SUPERCONDUCTOR SCIENCE & TECHNOLOGY,33.
MLA Gao, P.,et al."Transverse-pressure susceptibility of high-J(c) RRP and PIT types of Nb3Sn Rutherford cables for accelerator magnets".SUPERCONDUCTOR SCIENCE & TECHNOLOGY 33(2020).

入库方式: OAI收割

来源:合肥物质科学研究院

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