EVALUATION METHOD OF MAGNETIC DAMPING EFFECT FOR FUSION-REACTOR FIRSTWALL

An evaluation method of the magnetic damping effect and a method to de termine the conditions for a reduced scale magnetic damping test of fu sion reactor first wall are described. The coupling intensity paramete r is used for the evaluation method because it has the potential to ev aluate the magnetic damping effect. The thickness and the steady magne tic field required in the reduced tests are obtained to maintain two p arameters unchanged, namely the coupling intensity parameter and the r atio of time constants of eddy current and structure, using finite ele ment analysis and the solution of the coupled eigenvalue. To verify th e scaling method, experiments and numerical analyses of a plate are pe rformed for various scale factors. Good agreement between the displace ment responses of the original and reduced configurations is obtained. The steady magnetic field of the reduced scale test can be decreased using copper or aluminum alloy instead of austenitic stainless steel. (C) 1998 Elsevier Science S.A. All rights reserved.