DocumentCode :
1981906
Title :
Decoherence and recoherence of beam in phase space
Author :
Shi, Jicong ; Ohnuma, Sho
Author_Institution :
Dept. of Phys., Houston Univ., TX, USA
fYear :
1993
fDate :
17-20 May 1993
Firstpage :
3603
Abstract :
Using the particle distribution in phase space, we introduce a new approach to study the decoherence and recoherence of a kicked beam when betatron tunes are far from any resonance. With this method, the decoherence and the recoherence of a beam can be analyzed easily in both 2-dimensional and 4-dimensional cases with any form of the tune spread. We have also studied the decoherence of a beam initially trapped in a resonance island. Due to the tune modulation, the separatrix of island develops a chaotic layer and particles within the island can drift out of the island along the layer. Consequently, the beam decoheres gradually. The rate of decoherence is shown to be proportional to the modulation amplitude. As a function of the modulation frequency, it reaches a peak near the tune of trapped particles before decreasing to zero
Keywords :
beam handling techniques; particle beam diagnostics; tuning; betatron tunes; decoherence; kicked beam; modulation amplitude; modulation frequency; phase space; recoherence; tune spread; Amplitude modulation; Chaos; Extraterrestrial phenomena; Frequency modulation; Nonlinear equations; Particle beams; Physics; Poisson equations; Resonance; Synchrotrons;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
Type :
conf
DOI :
10.1109/PAC.1993.309731
Filename :
309731
Link To Document :
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