Topic : Studies of collective bunch instabilities in electron storage rings

  

 Scope  

                        Collective effects are caused by the interactions between charged particles (electrons) and their surroundings. However, electrons can also interact with themselves leading to space charge effects and with their surrounding creating electromagnetic fields called wake fields. The wake field can be a cause of a longitudinal and transverse instabilities resulting in an ultimate electron beam current. It became more significant limitations to the achievable a high beam current at low beam emittance. To enhance the stored electron beams and improve a machine performance, studies on coupled-bunch instabilities and their effect on synchrotron light source operation and performance both with uniform filling pattern and non-uniform filling pattern are required. In the longitudinal case, coupled-bunch instabilities driven by the Higher Order Modes (HOMs) of the RF-cavity will be investigated, while in the transverse case numerical simulations with a particle tracking code for self-consistent simulations of collective effects driven by short and long-range wake fields will be complemented.
                      This project will focus on all these bunch stabilities and aim to enhance the brightness of synchrotron light. We are looking for students who have good motivation to learn in multi-particle beam dynamics, simulations with some codes.

  

 Supervisor  

                        Dr. Somjai Chunjarean
                        Dr. Thanapong Phimsen
                        and SLRI researchers