Performance Studies of Superconducting Dipoles for the Fermilab Energy Doubler

The Energy Doubler magnet development and testing program was initiated in September 1972 and has thus far proceeded through three phases. In the first phase, several wire winding geometries and the ability to reproduce magnet field properties in a pair of dipoles were explored. This phase closed with construction and operation of a 20 foot dipole magnet. When the 20 foot magnet did not perform to expectations phase 2, a program of 2.5 foot prototype construction, was initiated. Twelve 21/2 foot magnets were tested to evaluate problems of excessive training and failure to go to short sample. Sufficient infoimation was gained about mechanical structure, wire properties and coil cooling from these studies to cause an extensive redesign of the basic Energy Doubler dipole magnet. Construction of the first magnet of new design, Cl - 2.5, in October of 1974 marked the initiation of phase 3 of our program. Three magnets have now been completed: Cl - 2.5, a 21/2 foot magnet, has gone to 40 kG mounted in a horizontal cryostat with warm iron. C2 - 2.5 has been used to explore some special concepts of coil confinement, and C2 - 10 has been tested by a 12,000 cycle test and excitation to 25 kG without iron as a demonstration of a magnet that would allow operation of the Doubler from 100 to 500 GeV in the "Energy Saver" mode.