Conveners
M2OrB - YBCO Coated Conductors II: Processing & Properties
- Lukas Graber (Georgia Tech)
- Arend Nijhuis (University of Twente)
In-field current transport property is one of the most important properties of high Tc superconducting tapes for practical applications. Usually the current-voltage (I-V) characteristics or critical current (Ic) are characterized by the four probe transport measurement or magnetization measurement using a short piece sample. In a practical application, however, the piece length of the...
The AC loss of different HTS cable types were measured in alternating magnetic fields including Conductor On Round Core (CORC) cables, stacked tape conductors and Roebel cable. The applied AC magnetic field is sinusoidal with amplitudes in the range of 5 to 400 mT and frequencies up to 0.1 Hz. The AC loss of CORC and Roebel cable was measured at 4.2 and 77 K. Inter-tape contact resistance...
A new facility for the measurement of AC loss in superconductors at high dB/dt has been developed, and recently tested and calibrated for operation. The test device has a spinning rotor consisting of permanent magnets arranged in a Halbach array; which exposes samples in a stator position with a peak radial field of 0.57 T, and with high rotation speeds up to 3600 rpm achieves a radial dB/dt...
Measurements were performed on a 40 centimeters length of 27-strand cored (F095) and 27-strand RRP non-cored Nb3Sn Rutherford cable which were mounted onto a U-shaped holder. For the cored cable: the core material was 316 S.S, the core was centered and had a width of 10.8mm, the cable was keystoned with a 0.95 degree angle, and the strands were OST-RRP with a 1.0mm OD and 60 filaments. For...
A robust detection of spontaneous quenching is essential for protecting superconducting magnets and machinery from thermal damage. In coils of high-temperature superconductors (HTS) slow propagation of the normal zone makes common voltage-based quench detection schemes unreliable. Here, we propose and validate an alternative quench detection technique for HTS conductors based on monitoring...
