OPERATIONAL EXPERIENCE WITH THE PERMANENT MAGNET

The Recycler [2] is a 3.3 km storage ring composed solely of permanent gradient magnets and quadrupoles. Commissioning of this accelerator was started in May 1999. In the last year a number of defects have been discovered and corrected, and a large number of beam studies have been performed, such as the exclusive use of barrier RF buckets to control the longitudinal phase space distribution. In this paper these experiences are presented. 1 RECYCLER OVERVIEW The Recycler ring has three missions [3] in the Fermilab accelerator complex. First and foremost, it allows antiprotons left over at the end of Tevatron Collider [4] stores (typically 80 % of the number injected into the Tevatron) to be re-cooled and re-used, hence th