General

Magnetic Signature Identification using Pareto optimization

Christopher Riley, Engineering Manager, Opera Software Abstract Determining the topology of a naval vessel from its measured magnetic signature is a classic inverse problem – what is the source of the observed response? This paper explores an alternative to classical inverse methods with a technique that is used in design optimization. Pareto optimization is commonly [...] Posted in General,Magnets,Magnets Paper

Efficiency of Exponential Deperm Protocol

Authors: Yongmin Kim, Young-Hak Kim, and Kwang-Ho Shin Abstract: Magnetic treatment of surface vessels and submarines (Deperm) is required to camouflage them against magnetic detection from enemy marine force. So far, deperm has been accomplished by applying an alternating magnetic field of which amplitude decreases linearly. However, the reduction of the residual flux density in […]

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A Linear Eddy Current Braking System defined by Finite Element Method

Authors: Hecquet M, Brochet P, Lee S.J, Delsalle P Ecole Centrale de Lille, Villeneuve d’Ascq, France Abstract: The authors propose in this paper the modelling and computing of a linear eddy current braking system by the finite element method. This braking system will be used in a high speed train. They study this device in […]

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Numerical and experimental investigation of bridge currents of an induction machine equipped with bridge configured winding

Authors: Sivaramakrishnan Natesan, Karuna Kalita, Venkatesu Samala Department of Mechanical Engineering, Indian Institute of Technology Guwahati, and ICON Design and Automation, Bangalore, India Abstract: An eccentric rotor motion imbalances the magnetic field distribution in the air-gap region. Due to this uneven flux density distribution, a net radial force called Unbalanced Magnetic Pull (UMP) is in […]

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Transient electromagnetic analysis of selected blanket modules of the ITER blanket system due to plasma disruption

Authors: J. D. Kotulski; R. S. Coats; M. A. Ulrickson Sandia National Laboratories, PO Box 5800, MS 1152, Albuquerque, NM 87185, USA Abstract: The prediction of electromagnetic loads on the ITER blanket modules during a plasma disruption is considered for two different blanket modules and different disruption events. The key features of the analysis procedure […]

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Scalarizing cost-effective multi-objective optimization algorithms made possible with kriging

Authors: Glenn Hawe and Jan Sykulski School of Electronics and Computer Science, University of Southampton Abstract: Purpose – The purpose of this paper is threefold: to make explicitly clear the range of efficient multi-objective optimization algorithms which are available with kriging; to demonstrate a previously uninvestigated algorithm on an electromagnetic design problem; and to identify […]

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TORUS CLAS12 – Superconducting Magnet Quench Analysis

Authors: V. S. Kashikhin; L. Elouadhiri; P. K. Ghoshal; D. Kashy; A. Makarov; O. Pastor; L. Quettier; G. Velev; M. Wiseman Fermi National Accelerator Lab., Batavia, IL, USA Abstract: The JLAB Torus magnet system consists of six superconducting trapezoidal racetrack-type coils assembled in a toroidal configuration. These coils are wound with SSC-36 Nb-Ti superconductor and […]

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A study of the effect of in-line and perpendicular magnetic fields on beam characteristics of electron guns in medical linear accelerators

Authors: Dragos E. Constantin, Rebecca Fahrig, Paul J. Keall Department of Radiology & Radiation Physics, Stanford University, Stanford, California 94305 Abstract: Purpose: Using magnetic resonance imaging(MRI) for real-time guidance during radiotherapy is an active area of research and development. One aspect of the problem is the influence of the MRI scanner, modeled here as an […]

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Development of Bi-2212 Insert Coils for Ultra High Field Magnet Applications

Authors: Ziad Melhem, Steven Ball, Steve Chappell Oxford Instruments Nanoscience, Tubney Woods, Abingdon, Oxon, OX13 5QX, UK Abstract: Ultra high field magnets for research applications require development of insert coils developed from high temperature superconductor materials (HTS) like Bi-2212 round wires. Integration of an outer, wide bore, magnet fabricated from low temperature superconductor materials (LTS) […]

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Rotor loss prediction in air-cored permanent magnet machines

Authors: Estanislao J.P. Echenique, Ozan Keysan, Markus A. Mueller Institute for Energy Systems, School of Engineering, Joint Research Institute in Energy, University of Edinburgh Abstract: Despite the cost raise of rare earth materials, low and medium speed permanent magnet (PM) machines have gained big popularity among wind turbine manufacturers due to their high efficiency and […]

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