SUMMARYThe Fermilab Energy Doubler project will require some 744 dipoles 6 meters long and 240 quadrupoles of varying lengths from 1.5 meters to 2 meters. Since earliest conception the Energy Doubler has been envisaged as an adjunct accelerator located in the same tunnel as the present Main King and capable of reaching a final proton energy of ~1000 GeV. To do this using a lattice similar to the Main Ring's requires a bending field of 45 kilogauss and, consequently, superconducting magnets.
1The magnet fabrication and testing program was initiated la Septecoer 1972, operated the first test magnats in January 1973, settled on a shell type geometry by June 1973, tested and evaluated a matched set of dipolea by November 1973 and operated the first 6 meter, or "20 ft", prototype dipole by March 1974. The 20 ft dipole did not perform satisfactorily, reaching lesa than 50% of design current and exhibiting excessive training.. Consequently, a redirection of the program channeled further efforts into a 2.5 ft model program to identify and correct the sources of difficulty and to enable resumption of 20 ft prototype construction.The first phase of the 2.5 ft program has Included the construction and testing of 12 magnets and is essentially complete. It has led to the promise of an inproved wire and a. slightly more conservative magnet design that is now being used in the construction of 2 1/2 and 10 ft models.Events in an intensive development program do not proceed in logical sequence. While the 2.5 ft model program has been ia active progress, two additional 20 ftprototype dipoles of the original design and one 7 ft quadrupole have been completed. One of these, 20 ft dipole 82, has bean successfully operated in the forced flow liquid helium pump loop.
2A 7 ft warm iron quadrupole has also been tested successfully and would be adequate in present fora for use in the Doubler project.
-EARLY MAGNET TESTING
MASTERMuch of the direction of the Energy Doubler magnet development program has been determined by the initial boundary conditions imposed. 3 ' 1 * Requirements for a small overall cross-section, for having fields that vary linearly with excitation current and for reducing refrigerator costs arising from cooldown and eddy current heating have led us from the outset to explore using warm iron oagnees. This is, of course, a controversial decision and does Impose stringent mechanical requirements on the thermal-isolating magnet supports.After a review of the many geometries used for producing dipole and quadrupole fields with superconducting magnets, studies concentrated on a shell versus a pancake geometry. Six dipole magnets and a cold iron quadrupole all of length ~1 meter were tested in this phase of our program. constructed of wire similar to that used in the quadrupole, achieved 35 kG with iron; but the pancake was I very ramp rate sensitive while the shell nagaat exhibited no ramp rate sensitivity, even when rasped with a 10 second repetition race.The oshar pancakes did not perform as well, and while this geoaecry ...
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