Abstract
The upper limit of the operating current of LTS solenoids can be estimated as the coordinate of the crossing point of its load line with I_{C} (B) line of the superconductor. For HTS coils this approach seems to underestimate the allowable operating current of the coil. A better approach is to obtain a full electric field distribution over the coil and to use it as the base for a more sophisticated coil design criteria. We developed an algorithm and a Matlab program for calculating distributions of the current density, magnetic field and electric field in HTS solenoids made of pancakes, considering the inhomogeneous current density distribution inside the anisotropic tape. IV curves of several Bi2223 coils are calculated and good agreeement of the calculated and measured critical currents, I_{C}, and indexes, n, are attained. One can utilize the program in the coil design choosing his own criteria of coil's critical current, e.g., 1) The average electric field 10^{4} V/m over the coil, 2) The electric field 10^{4} V/m at the weak point of the coil, 3) The energy dissipation in the entire coil, 4) Distribution of local energy dissipation.
Original language  English 

Article number  261 
Pages (fromto)  10681071 
Number of pages  4 
Journal  Journal of Physics: Conference Series 
Volume  43 
Issue number  1 
DOIs  
State  Published  1 Jun 2006 
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Cryogenfree HTS 20kVA transformer
Alexander Freidman (Manager) & Yosi Yeshurun (Manager)
Institute of Superconductivity Laboratory for Magnetic MeasurementsEquipment/facility: Equipment