Title :
Collective effects in the PLS storage ring
Author_Institution :
Pohang Accelerator Lab, POSTECH, Pohang, South Korea
Abstract :
Stored beam currents of 2.0 GeV at the PLS ring has been limited by coupled-bunch instabilities. It was found that beam currents in 2.0 GeV was mainly limited by 830.45 MHz transverse mode in RF cavities. Beam instabilities dependences on betatron tune and chromaticity were extensively investigated in the ring. Longitudinal coupled-bunch instabilities due to 758.66 MHz and 1300 MHz modes does not lead to beam loss up to 450 mA. The beam tail distribution and beam lifetime in 2.5 GeV are estimated by a simulation method. The result shows beam lifetime of 27 hours in 170 mA. The estimated lifetime shows a good agreement with that of normal beam operation
Keywords :
accelerator RF systems; accelerator cavities; electron accelerators; electron beams; particle beam bunching; particle beam dynamics; particle beam stability; storage rings; 1300 MHz; 170 mA; 2.0 GeV; 2.5 GeV; 27 h; 450 mA; 758.66 MHz; 830.45 MHz; PLS storage ring; beam lifetime; beam loss; beam tail distribution; betatron tune; chromaticity; collective effects; longitudinal coupled-bunch instabilities; normal beam operation; radiofrequency cavities; stored beam currents; transverse mode; Frequency conversion; Frequency estimation; Frequency measurement; Life estimation; Lifetime estimation; Linear particle accelerator; Optical coupling; Particle beams; Probability distribution; Storage rings;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987237
