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Paper   IPM / Particles And Accelerator / 11269
School of Particles and Accelerator
  Title:   Bunch Lengthening in Taiwan Photon Source Using Harmonic Cavity
  Author(s):  Hossein Ghasem
  Status:   In Proceedings
  Proceeding: Particle Accelerator Conference, 4-8 May,Vancouver, British Columbia, Canada, PAC (2009)
  Year:  2009
  Pages:   2270-2272
  Supported by:  IPM
  Abstract:
A superconducting accelerating RF cavity is going to be installed in 3GeV Taiwan Photon Source (TPS). It causes a reduction in bunch length in contrast with operation of normal type of RF cavity. A higher harmonic RF cavity is usually considered as an important tool to con-trol the bunch length in the storage rings. The harmonic cavity in lengthening mode can also be helpful for improving the lifetime which is usually dominated in the storage rings by large angle intrabeam scattering (Touschek). In this paper we study the effects of third active har-monic cavity on bunch length of the TPS ring. We present the procedure, the simulation and the formulae to analyze the effects of third harmonic cavity on the rms bunch length while the main superconducting RF system is operated in 3MV. It is shown that the longitudinal rms electron bunches will lengthen up to 7.9 times for the optimum operation of the harmonic sys-tem

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