Measurements, Analysis, and Simulation of Microwave Instability in the Low Energy Ring of KEKB

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Using a streak camera, we measured the longitudinal profiles of a positron bunch in the Low Energy Ring (LER) of KEKB at various currents. The measured charge densities were used to construct a simple Q=1 broadband impedance model. The model, with three parameters, not only gave an excellent description of longitudinal dynamics for positive momentum compaction factor but also for the negative ones, including bunch shortening below a threshold and bursting modes above the threshold. Furthermore, our study indicated that the threshold of microwave instability was about 0.5 mA in bunch current in the LER. At the nominal operating current ... continued below

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4 pages

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Cai, Yunhai; /SLAC; Flanagan, J.; Fukuma, H.; Funakoshi, Y.; Ieiri, T. et al. May 7, 2009.

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Description

Using a streak camera, we measured the longitudinal profiles of a positron bunch in the Low Energy Ring (LER) of KEKB at various currents. The measured charge densities were used to construct a simple Q=1 broadband impedance model. The model, with three parameters, not only gave an excellent description of longitudinal dynamics for positive momentum compaction factor but also for the negative ones, including bunch shortening below a threshold and bursting modes above the threshold. Furthermore, our study indicated that the threshold of microwave instability was about 0.5 mA in bunch current in the LER. At the nominal operating current 1.0 mA, there was a 20% increase of the energy spread. The results of measurement, analysis, and simulations will be presented in this paper.

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4 pages

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  • Presented at Particle Accelerator Conference (PAC 09), Vancouver, BC, Canada, 4-8 May 2009

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  • Report No.: SLAC-PUB-13587
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 953000
  • Archival Resource Key: ark:/67531/metadc930112

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  • May 7, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 15, 2016, 3:37 p.m.

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Cai, Yunhai; /SLAC; Flanagan, J.; Fukuma, H.; Funakoshi, Y.; Ieiri, T. et al. Measurements, Analysis, and Simulation of Microwave Instability in the Low Energy Ring of KEKB, article, May 7, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc930112/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.