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A lithium lens focusing device Yill be used for the collection of 8 GeV antiprotons in the Fermilab Tevatron I Project. •The details of the mechanical and electrical design of the Fermilab lens and its associated toroidal transformer are discussed. The lens, with a radius of 1 cm and length 15 cm, is expected to achieve gradients of 1000 7/m for a focal distance of 0.225 m. The gradient requires a current on the order of 5x10SA, resulting in• large electromagnetic and thermal stresses. The power supply discharge current and the effect of the inductance of the power leads and connections are minimized by the use of a toroidal matching transformer surrounding the lens itself.

The Main Injector project at Fermilab requires B dipole with good field quality from 0.1 T to 1.73 T with ramps to full field at up to 2.4 T/s over an aperture of 10x6 cm. Op e&ion of this magnet for the variety of purposa proposed for the Main lqjector results in a design with low indnctame, large copper cnm metion, and fidd uniformity sufficient for high intensity iqjection and efficient slow resonant extraction. The resulting design is presented, along with meaauremcnt results of a prototype magnet emphasiring the field uniformity.

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The differential cross section for the elastic scattering of 3.7-Mev neutrons from sulfur, iron, cobalt, nickel, copper, and zinc has been measured in a ring geometry using a modified Bonner-type scintillation detector. The measurements were taken over an angular range between 10° and 160°. Angular resolution effects have been removed by a suitable iterative procedure. Multiple-scattering effects have been removed by an approximate analytical treatment.