EDDY-CURRENT HEATING IN THE DOLD STRUCTURE IN TPX

The toroidal field coil cases and support structure for the TPX are at cryogenic temperatures. The time varying currents in the poloidal fie ld coil system will induce eddy currents in these structures. The asso ciated Joule dissipation will cause local heating and require heat rem oval which will show up as a load on the cryogenic system. Knowlege of the heat load distribution in both space and time is important to the design of the system. Analyses have been performed using programs EDD YCUFF and ANSYS and the results presented.