Title :
Effect of energy spread on the dipole beam break-up instability
Author :
Chernin, D. ; Mondelli, A.
Author_Institution :
Sci. Applications Int. Corp., McLean, VA, USA
Abstract :
The behavior of the BBU (beam breakup) instability in short bunches was studied analytically, using the two-particle approximation, and in long bunches it was analyzed numerically. The results in both cases show that quadrupole-focused systems are more sensitive to energy spread than are solenoid-focused systems. This result may be caused by the presence of a zero frequency mode in the solenoid system. The secular growth due to this mode persists even in the presence of energy spread, which therefore is less effective in stabilizing the growth of the instability
Keywords :
beam handling techniques; particle beam diagnostics; dipole beam break-up instability; quadrupole-focused systems; secular growth; short bunches; solenoid-focused systems; two-particle approximation; zero frequency mode; Acceleration; Current limiters; Drives; Induction machines; Linear accelerators; Magnetic heads; Particle measurements; Resonance; Solenoids; Tail;
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
DOI :
10.1109/PAC.1989.73383
