BS EN 61788-8:2003 Superconductivity - AC loss measurements - Total AC loss measurement of Cu/Nb-Ti composite superconducting wires exposed to a transverse alternating magnetic field by a pickup coil method
This part of IEC 61788-8 specifies the measurement method of total AC losses by the pickup coil method in Cu/Nb-Ti composite superconducting wires exposed to a transverse alternating magnetic field. The losses may contain both hysteresis and coupling losses. The standard method to measure only the hysteresis loss in DC or low-sweep-rate magnetic field is specified in IEC 61788-13 [2].
The specimen shall be a multifilamentary round or rectangular wire, expected to be mainly used for pulsed coil applications with relatively higher frequencies or sweep rates up to 1 Hz or 4 T/s, with diameter or average size from 0,2 mm to 1,0 mm, filament diameter from 1 μm to around 50 μm, and a coupling time constant less than about 40 ms.
The present method can be also extended to the AC loss measurement in a higher range of frequency and sweep rate up to more than 10 Hz or 40 T/s for three-component superconducting wires (IEV 815-04-33) with a shorter coupling time constant down to about 0,1 ms (see Annex E).
BS EN 61788-8:2003 history
2010BS EN 61788-8:2010 Superconductivity. AC loss measurements. Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium temperature by a pickup coil method
2003BS EN 61788-8:2003 Superconductivity - AC loss measurements - Total AC loss measurement of Cu/Nb-Ti composite superconducting wires exposed to a transverse alternating magnetic field by a pickup coil method