Conveners
Thu-Po-3.6: Superconductors, AC Loss & Stability
- Alexey Dudarev (CERN)
In order to improve the transmission capability of the second generation REBCO tape, many structures of superconducting strand/cable stacked with REBCO tapes were proposed. In this paper, a compact twisted stack tape conductor (TSTC) with stepped grooves was performed. The stepped groove is divided into long groove and short groove with different number of tapes, and a long copper plate is...
The high temperature superconducting (HTS) twisted stacked tape conductor (TSTC) is one of the methods to improve the current-carrying capability of a superconducting conductor. A three stepped slots with twisted stacked YBCO tapes is presented in this paper. The YBCO tapes embedded in the stepped grooves of two different lengths. A 2D finite-element model is used to computes the magnetic...
We report anomalous magnetic properties in high DC magnetic fields H up to 16 T on an underdoped PrBa2Cu3O6.44 insulating ceramic sample of cuprate family. Significant magnetic-field effects are revealed in the derivative dM(T)/dT of the magnetization M(T) versus T using two sets of values of H selected in the range of 2.5-9.5 T. Anomalies are observed in the region of Tcr ~ 4.5 K, T2 ~ 6.5 K...
The KIT-CERN Collaboration on Coated Conductors (KC4) was established as a research facility for the development of novel long-length Coated Conductor samples. This production line, originally established by Bruker, has been used to produce REBCO CCs since last year after its assembly at the Institute for Technical Physics (ITEP, Karlsruhe Institute of Technology). Recent measurements of the...
Rare-earth barium copper oxide (REBCO) coated conductor tapes hold immense promise for high-field magnet applications due to their exceptional critical current (I_c) at cryogenic temperatures. However, during magnet manufacturing and operation, REBCO tapes experience strain and fatigue, potentially affecting their I_c and compromising performance. This study investigates the interplay between...
Multilayer insulation (MLI) is a critical material used to control radiative heat transfer in cryogenic systems. MLI consists of alternate layers of reflective aluminized mylar, separated by low thermal conductivity spacers. The thermal emissivity of the MLI layer plays a critical role in minimizing the radiative heat transfer through its layers. The formation of native oxide is inevitable in...
The development of high temperature REBCO superconducting (HTS) REBCO tapes are promising for high field magnets. However, the mechanical properties of these tapes are transversally isotropic a special case of anisotropy, where the elastic behavior is determined largely by the thickness of the Hastelloy substrate and the electroplated copper stabilizer. Furthermore, for such high magnetic...
Multi-layer insulation (MLI) is a passive insulation technology, which is known as "super insulation" due to its excellent insulation performance in cryogenics engineering field. The traditional multi-layer insulated reflective layer often uses a single aluminum metal coating, ignoring the influence of temperature change on the metal emissivity. On this basis, this paper proposes a variable...
The 650 MHz superconducting radio-frequency (SRF) cavities used for the Circular Electron Positron Collider (CEPC) were studied to achieve high accelerating gradient (Eacc) and high intrinsic quality factor (Q0). The 650 MHz single-cell cavities were subjected to a combination of buffered chemical polishing (BCP) and electropolishing (EP), and their Eacc exceeded 40 MV/m. Such a high Eacc may...
Our recent investigations have highlighted REBa2Cu3O7-x (RE = rare earth) Coated Conductors (CCs) as promising candidates to replace copper (Cu) as low surface-impedance coatings in high-energy physics (HEP) RF applications operating under very-high magnetic fields [1, 2, 3].This contribution provides a thorough demonstration of why REBCO CCs as promising solutions for the HEP community,...
Varying the sputtering power during magnetron reactive sputtering deposition simultaneously affects the sputtering yield of the target atoms and the degree of disorder in the films. This greatly tunes the physical properties of transition metal oxynitrides films (
Burning plasma Experimental Superconducting Tokamak (BEST) is a full superconducting coil tokamak. The heat treatment of the Nb3Sn coils of the BEST is carried out by using atmosphere atmosphere-protected heat treatment furnace. The temperature uniformity throughout the coil becomes a crucial problem due to the large size of the cross-section of the coil. In this study, the temperature...
REBCO coated conductor is a HTS material that is promising for a wide range of applications. One of them is the application for current leads of magnet systems. In the design of current leads, it is important to minimize its thermal conduction while maintain the superior electrical conduction of the superconductors.
In this study, we fabricated 4 mm wide REBCO tapes stabilized with different...
Producing accurate computational models that forecast the alternating current losses associated with cold-dielectric conductors is pivotal for power grid investors, what in turn can influence the designing and manufacturing of lightweight superconducting cables aspiring to reach high engineering current densities whilst maintaining a compact structure. By utilizing the so-called H-formulation...
