Paper  Title  Page 

MOP1WB02 
Overview of the APSU Project  


This talk is about the overview of the APSU Project.  
Slides MOP1WB02 [3.755 MB]  
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THP1WB03 
Theory of Longitudinal Multibunch Instabilities Including a HigherHarmonic (BunchLengthening) Cavity  


Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DEAC0206CH11357. The next generation of highbrightness storage rings typically require a higherharmonic rf system to increase the bunch length and improve lifetime. The modified longitudinal dynamics has important implications for multibunch stability, since bunch lengthening also changes the synchrotron frequency both by lowering its mean (which reduces stability), and by increasing its variation with amplitude (which gives rise to Landau damping). To understand these competing effects, we present an analytic theory of longitudinal multibunch instabilities in the presence of a higherharmonic cavity tuned to lengthen the bunch. The theory results in a relatively straightforward extension to the usual matrixbased multibunch analysis, and we show how the numerically determined growth rates can be used to understand the role of Landau damping. Finally, we compare predictions of the theoretical growth rates to those extracted from tracking simulations of the proposed APS Upgrade lattice. 

Slides THP1WB03 [1.899 MB]  
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