Topic : Development of RF-shield bellow for low impedance electron storage ring

  

 Scope  

                        For new generation synchrotron light source, an instability caused by Wakefield generated from vacuum components must be concerned. Bellow has been used to accommodate long thermal expansions of the beam pipes and be one of the Wakefield sources. In this project, the bellow with RF shield which contain a high frequency shield structure inside will be designed. The impedance from the designed bellow will be investigated to optimize the design. The key design parameters of an RF shield structure are the contact force between a pair of fingers and the width and length of the slit between adjacent fingers. While the former is decided by the wall beam current and wall electric field, the latter is dependent on the Higher Order Modes (HOM). The bellow will be fabricated and tested both by heating and impedance measurement.

  

 Supervisor  

                        Dr. Thanapong Phimsen
                        Dr. Somjai Chunjarean
                        and SLRI researchers