Modelling nonlinear effects in high temperature superconducting magnets
Research output: Book/Report › Doctoral thesis › Collection of Articles
|Publication status||Published - 10 Jan 2020|
|Publication type||G5 Doctoral dissertation (article)|
|Name||Tampere University Dissertations|
This thesis begins by introducing the readers to the mathematical and physical background for understanding the research presented in the attached publications. The background is followed by the chapters reviewing and synthetizing the publications. The focus in this thesis is on the AC loss modelling and thermal stability modelling. First, AC losses and magnetic field quality are modelled in Feather-M0 using a self-implemented minimum magnetic energy variation principle based simulation tool. Then, the focus is moved on the thermal stability modelling of HTS magnets by formulating the thermal model utlized in this thesis work. Next, the thermal model is utilized for scrutinizing the behavior of Feather-M2 with an inverse problem based modelling approach. Using the Feather-M2 measurement data, the inverse problem solutions are obtained for the thermal model parameters characterizing the magnet in terms of the thermal model. Furthermore, the thermal model is utilized and an optimization problem is formulated in order to determine the maximum stable operation current of Feather-M2. Finally, an energy-extraction system (EES) design for 20 T range magnet is presented and optimized by formulating and solving an optimization problem.