Title :
Degradation of brightness by resonant particle effects
Author :
Chen, Y.J. ; Caporaso, G.J. ; Cole, A.G. ; Paul, A.C. ; Turner, W.C.
Author_Institution :
Lawrence Livermore Nat. Lab., California Univ., Livermore, CA, USA
Abstract :
A resonance between the periodic focusing force and the envelope oscillations or the particle orbits can lead to beam halo formation and a dramatic decrease in brightness. A theoretical model has been developed for this parametric transport instability. The authors also investigated the instability on the Experimental Test Accelerator II (ETA-II). The instability can be excited by altering the excitation of just one solenoid.<>
Keywords :
collective accelerators; electron accelerators; particle beam diagnostics; ETA-II; Experimental Test Accelerator II; beam halo formation; brightness degradation; envelope oscillations; parametric transport instability; particle orbits; periodic focusing force; resonance; Brightness; Degradation; Equations; Life estimation; Magnetic fields; Orbits; Particle beams; Resonance; Solenoids; Testing;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.165200
