title: First observation of simultaneous alpha buckets in a quasi-isochronous storage ring
abstract: We present the first experimental evidence confirming the theoretical predictions of alpha buckets in an electron storage ring. By controlling both the first- and second-order momentum compaction factors, we succeeded in storing electrons simultaneously in a pair of alpha buckets or in either bucket alone. The two electron bunches are separated in energy by slightly less than 1% and the energy is tunable over a narrow range. The energy difference was directly measured using synchrotron light from an undulator. Simultaneous two-color light beams from an undulator were generated. By changing the rf voltage, we were able to vary the normally fixed longitudinal bunch separation.
authors.affiliation: National Synchrotron Light Source, Building 725C, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.initials: JB
authors.lastname: Murphy
authors.initials: SL
authors.lastname: Kramer