Title :
A study on the possibility to increase the PSR e-p instability threshold
Author :
Danilov, V. ; Galambos, J. ; Jeon, D. ; Holmes, J. ; Olsen, D. ; Fitzgerald, D. ; Macek, R. ; Plum, M. ; Griffin, J. ; Burov, A.
Author_Institution :
SNS Project, Oak Ridge Nat. Lab., TN, USA
Abstract :
The Proton Storage Ring (PSR) has a fast intensity-limiting instability, which may result from an electron cloud interaction with the circulating proton beam leading to a transverse mode coupling instability. Multipacting may also be very important. A PSR beam experiment is proposed with an available 150-350 MHz RF cavity. This cavity would produce a high frequency longitudinal density ripple on the proton bunch which could reduce the e-p instability by two mechanisms: (1) a ~350 MHz ripple could clear electrons by creating an unstable parametric resonance between the electrons and protons, and (2) a ~150 MHz ripple could reduce multipacting by reducing the electron energy at the vacuum chamber
Keywords :
accelerator RF systems; accelerator cavities; particle beam bunching; particle beam stability; proton accelerators; proton beams; storage rings; 150 to 350 MHz; PSR e-p instability threshold increase; Proton Storage Ring; RF cavity; circulating proton beam; electron cloud interaction; fast intensity-limiting instability; high frequency longitudinal density ripple; multipacting; proton bunch; transverse mode coupling instability; unstable parametric resonance; Electron beams; Electron emission; Elementary particle vacuum; Optical coupling; Particle beams; Potential well; Protons; Radio frequency; Resonance; Tail;
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.1999.795495
