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Limits of NbTi and Nb3Sn, and Development of W & R Bi-2212 HighField Accelerator Magnets

R. M. ScanlanA. GodekeD. R. DietderichD. ChengS. O. PrestemonP. FerracinG. Sa bbi

出版	Lawrence Berkeley National Laboratory, 2006
URL	http://books.google.com.hk/books?id=q-nPjwEACAAJ&hl=&source=gbs_api

註釋NbTi accelerator dipoles are limited to magnetic fields (H)of about 10 T, due to an intrinsic upper critical field(Hc2) limitationof 14 T. To surpass this restriction, prototype Nb3Sn magnets are beingdeveloped which have reached 16 T. We show that Nb3Sn dipole technologyis practically limited to 17 to 18 T due to insufficient high fieldpinning, and intrinsically to 20 to 22 T due to Hc2 limitations. Therefore, to obtain magnetic fields approaching 20 T and higher, amaterial is required with a higher Hc2 and sufficient high field pinningcapacity. A realistic candidate for this purpose is Bi-2212, which isavailable in roundwires and sufficient lengths for the fabrication ofcoils based on Rutherford-type cables. We initiated a program to developthe required technology to construct accelerator magnets from'windand-react' (W & R) Bi-2212 coils. We outline the complicationsthat arise through the use of Bi-2212, describe the development paths toaddress these issues, and conclude with the design of W & R Bi-2212sub-scale magnets.