Magnetic field distributions of stacked large single domain Gd–Ba–Cu–O bulk superconductors exceeding 140mm in diameter

High-temperature superconductors of the family (RE)Ba2Cu3O7-δ and their application (Review Article)

“…To date, the record sizes of textured samples are singledomain GdBaCuO discs with a diameter of 143-153 mm and a thickness of 20 mm. [123][124][125][126] In Ref. 123 a GdBaCuO disc was grown using the composite gradient method (the concentration of Dy increases and the concentration of Gd decreases as we move from the center to the periphery of the disc).…”

“…20). 162 In addition to the increase in the TMF in the small gap between two discs, 126,[158][159][160][161][162][163][164] in comparison to the TMF at the surface of one disc, it was found that when several discs are stacked on top of one another the TMF component perpendicular to the disc surface also increases due to the decrease in the demagnetizing factor that occurs with the increase in sample "thickness." Thus, the TMF value in the FC mode at the surface of one GdBaCuO disc with a diameter of 140 mm and thickness of 20 mm at T ¼ 65 K was B tr ¼ 3.66 T, 124,125 in the small (3 mm) gap between two Fig.…”

“…The TMF temperature dependences in the FC mode for irradiated and unirradiated YBa 2 Cu 3 O 7-d samples. 162 discs B tr ¼ 5 T, 126 and at the surface of a system of two discs B tr ¼ 4.3 T. 126 It was shown in Ref. 165 that when three DyBaCuO discs with a diameter of 45 mm and a thickness of 10 mm are superimposed onto one another, the TMF at the surface of this system in FC mode at T ¼ 77 K increases by 1.7 times, however once a fourth disc is added the TMF is lower than in the case of three discs.…”

“…For YBCO r max ¼ 25-30 MPa. 154,169 Several methods are used in order to circumvent the rupture: adding silver to the process of preparation for bulk samples, [159][160][161] using a metal tie band (rings of stainless steel, [124][125][126]153,154,[159][160][161]170,171 as in Fig. 21, or of an aluminum alloy 163,166 ) steeping with adhesive in vacuum, 156,158,172 and hardening using carbon fibers or fiberglass.…”

A New Method for Batch Production of Single Domain GdBCO Bulks of Different Growth Sectors Using One Seed by the RE+011 TSIG Process

“…To minimize the contamination of the bulk by the seed crystal and raise the maximum processing temperature ( T max ), the buffer layer was used in the process of the fabrication REBCO superconductor bulks. − A buffer layer was first used in the cold-seeding process by Li et al, and a large-sized GdBCO bulk with a diameter of 56 mm was fabricated successfully . Subsequently, this buffer layer technology has been widely developed and used, especially in the batch preparation of superconductor. − It is worth mentioning that the optimum aspect ratio ( r / h = 1) of the buffer pellet was obtained by Shi et al For fabrication of larger REBCO superconductor bulks, the multi-seed technology was invented. − Multi-seeds have been adopted for the growth of large REBCO bulk, , such as Sakai et al fabricated a large GdBCO superconductor bulk 140 mm in diameter with the multi-seeds method . Tang et al.…”