Speaker
Description
One of the practical applications of the second generation HTS tapes (or CC – coated conductors) lays in the area of development of superconducting magnetic energy storages (SMES). In particular, HTS SMES will be applied for charging pulse mode magnets used in particle accelerators. The important particularity of such magnets is the rapidly changing operating current and magnetic field at low operating temperature. So, for successful development both SMES and future superconducting magnets for accelerators it needs to know the values of critical currents and hysteresis losses of HTS CC at various orientation of direction of magnetic field to the tape plane. These data may be obtained from magnetization measurements.
In our report we present new results of investigations of the HTS CC samples in a wide range of temperatures from 5 K up to 77 K and magnetic fields up to 8 T directed to the tape plane with the angles 0, 5, 10, 15, 30, 45 and 90 degrees. The measurements were done using vibration sample magnetometer PPMS-9 with using the specially made set of the sample holders. We found that the decrease in magnetic field angle results in not only reducing of the hysteresis losses but changing of the shape of magnetization curves as well as appearance of thermo-magnetic instabilities at low temperatures. We have done the analyses of the experimental data and proposed the approximation expression that fits well the dependence of hysteresis values on angle.
