Title :
Beam loss at the beginning of acceleration in the KEK-PS main ring
Author :
Toyama, T. ; Arakawa, D. ; Igarashi, S. ; Kishiro, J. ; Koba, K. ; Takayama, K.
Author_Institution :
High Energy Accel. Res. Organ., Ibaraki, Japan
Abstract :
As one approaches the intensity upgrade of the KEK-12GeV-PS, the beam loss at the beginning of acceleration should be removed. The loss observed around 80 ms after the beginning of acceleration results from the horizontal head-tail instability. The instability occurs due to a large change in the chromaticity produced by the sextupole field induced in the beam-pipe of the dipole magnets. The horizontal chromaticity moves into a positive region just around 80 ms after the beginning of acceleration. The longitudinal modes 0, 1 and 2 have been observed
Keywords :
particle beam stability; proton accelerators; storage rings; synchrotrons; 12 GeV; KEK-PS; Proton Synchrotron; acceleration; beam loss; chromaticity; horizontal chromaticity; horizontal head-tail instability; longitudinal mode; sextupole field; Acceleration; Conductivity; Eddy currents; Energy measurement; Magnets; Monitoring; Particle beams; Power supplies; Time measurement; Timing;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.750771
