Four octupoles are used in SPEAR to provide the frequency spread for Landau damping of coupled-bunch motions at high current. With the planned implementation of a new low-emittance lattice, the effectiveness of the octupoles needs to be quantified. The recent development of a multi-dimensional turn-by-turn phase-space monitor and the availability of an accurate frequency analysis technique have made measurement of the octupole-induced amplitude-dependent frequency shift in the new SPEAR lattice possible.
Selection of Experimental Shift Summaries Relevant the Subject
Shift Summary: "Phase-Space Dynamics Studies" on January 22-23, 1996
List Publications
Publication about octupole induced frequency shift (About 1.78 MBytes !!!)