Title :
Landau damping of the vertical coherent motions due to lattice nonlinearities in storage rings
Author :
Kobayashi, Yukinori ; Ohmi, Kazuhito
Author_Institution :
Photon Factory, High Energy Accel. Res. Organ., Ibaraki, Japan
Abstract :
The systematic measurements of the vertical coherent motion were made with various chromaticities, octupole magnetic currents, beam currents and betatron tunes to study its damping mechanism at the Photon Factory storage ring (PF-ring). The polarity of the octupole magnetic currents corresponding to the sign of the amplitude dependent tune shift played an important roll in the damping of the vertical coherent motions. This is the same as the horizontal coherent motions
Keywords :
electron accelerators; particle beam stability; storage rings; Landau damping; Photon Factory storage ring; amplitude dependent tune shift; betatron tunes; lattice nonlinearities; octupole magnetic currents; storage rings; vertical coherent motions; Clamps; Current measurement; Damping; Energy measurement; Lattices; Motion measurement; Particle tracking; Production facilities; Storage rings; Synchrotrons;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.792220
