Experiences with Permanent Magnets at the Fermilab Recycler Ring.

摘要

In order to achieve higher luminosities in Run II a separate anti proton storage ring was built in the Main Injector tunnel. To reduce both construction and operations costs permanent magnets were used. This paper discusses the design criterion and specifications, including temperature dependence, longitudinal uniformity, and adjusting of the higher harmonics of the magnets. The design tolerances for a storage ring are more stringent than for a single pass beam line. The difference between the measured and ideal central field for each magnet was held to better than one part in 10 (sup 3). The temperature stability for all magnets was set to better than 1 part in 10 (sup 4) per degree Celsius. Higher order harmonics relative to the central field were set to less than 1 part in 10 (sup 4). This was done for all 484 permanent magnet that were built.