Temperature Dependence of Total AC Loss in High-Temperature Superconducting Tapes

Abstract

A versatile experimental facility was designed and set up to measure transport ac losses, magnetization ac losses, and total ac losses in high-temperature superconductors at variable temperatures. Several sets of measurements were carried out in the temperature range of 35 K to 100 K. Sample temperature during the measurements could be controlled within 0.5 K of set temperature. Temperature dependence of transport losses reflects variation of critical current density of the tapes with temperature. Temperature dependence of magnetization losses exhibits an interesting behavior with a peak, whose position shifts to lower temperatures as the magnetic field is increased. Experimental data of ac losses at various temperatures are compared with those calculated using numerical methods. Generally, the simulated results reproduce well the experimental data.

Current carrying capability of HTS Roebel cable

“…It not only indicates the current capacity of the wire but also is crucial to any estimates of AC loss [1,2]. This value therefore is of primary importance in setting the operating current, operating temperature and cooling capacity chosen in a device.…”

Role of asymmetric critical current on magnetization loss characteristics of (RE)Ba2Cu3O7−d coated conductors at various temperatures

“…[16][17][18][19][20][21] Therefore, these existing studies have not investigated the role of asymmetric I c (B, θ) properties on the magnetization loss. In the temperature-dependent measurements, [22][23][24] there have been notable limitations in either the magnetic field amplitude or the operating frequencies of the external magnetic field; e.g., the magnetic field amplitudes were only up to 60 mT at 51 Hz in one study, 23 and the frequency range only covered 0.05-0.2 Hz even though the magnetic field amplitude was up to 3.5 T in another study. 24 Hence, there is a need for systematic measurements of magnetization loss with various magnetic field angles and temperatures.…”

“…There have been intensive studies on the magnetization loss of HTS coated conductors with various field-angles at 77 K [14][15][16][17][18][19][20][21] and the temperature dependence of magnetization loss under a perpendicular applied magnetic field. [22][23][24] In the field-angle dependence studies, the field angle was varied within 90 at 77 K 14,15 in the experimental studies, and symmetric I c (B, θ) characteristics were assumed in the numerical calculations. [16][17][18][19][20][21] Therefore, these existing studies have not investigated the role of asymmetric I c (B, θ) properties on the magnetization loss.…”

Using the Resistance Depending on the Magnetic and Electric Susceptibility to Derive the Equation of the Critical Temperature

“…Using Equation (6) and substituting the value of v in the equation of current, that given due to the electron velocity v , charges density n , and the area A , e I n vA = , then the current I is found to be 2 …”