Stabilization of large superconducting magnets - Experimental models

Experiments in two principal areas concerning the stabilization of large superconducting magnets are described. The first, is to develop means of avoiding conductor motion that causes frictional heating (either by minimizing the coupling or eliminating the source). The second, is the measurement of minimum quench propagation currents in simulated cooling conditions. The evaluation of cooling channel geometries proposed for the U-25 by-pass MHD saddle magnet is described, along with measurements of the recovery current (for several passage heights) and of the recovery phenomenon at 4.2 K in a model pancake coil for the design of a 25-T hybrid magnet.