BC1-SRM machine learning study: how to infer the electron bunch-length from the bunch energy distribution measured by a synchrotron radiation monitor in a chicane

Your tasks

The Synchrotron Radiation Monitor (SRM) - installed in BC1 of SwissFEL - permits a fully non-invasive imaging in the visible of the edge synchrotron radiation (SR) emitted by the electron beam at the entrance of the third dipole of the chicane. From the knowledge of the dispersion of the magnetic chicane, the analysis of the horizontal distribution of the acquired SR images of the beam permits to determine the central energy and energy spread of the beam. The acquisition of the BC1-SRM images is beam-synchronous at a repetition rate of 100 Hz. Moreover, thanks to a fast gated MCP, the BC1-SRM camera is able to discriminate either the first or the second bunch in the 28ns long beam macro-structure. Possible application of this non-invasive monitor concerns the optimization of the compression phase of the off-crest RF structures of the injector as well as the phase of the X-band linearizer. Recently, it was also demonstrated how to estimate the electron bunch length from the beam synchronous acquisition of the BC1-SRM images and the parameters (phase and amplitude) of the RF structures of the injector. In conclusion, the potentialities of the BC1-SRM in optimizing the RF parameters of the linearized compression in the SwissFEL injector together with the most recently demonstrated potentiality in determining the bunch length permit to envisage a possible machine learning application from the analysis of the beam energy distribution measured by the SRM at the BC1 chicane.

Your profile

  • You study in physics, engineering, or a similar field (minimum 4 semesters)
  • You have an interest in developing new instruments and measurement methods
  • You are open-minded, communicative and you enjoy working in an international team
  • You have not yet completed your Master’s thesis

We offer

Our institution is based on an interdisciplinary, innovative and dynamic collaboration.

The contract will be limited to 3 months.

For further information, please contact Dr Gian Luca Orlandi, phone +41 56 310 47 39.

Please submit your application online for the position as a Trainee (index no. 8123-T1).

Paul Scherrer Institut, Human Resources Management, Patrizia Meister, 5232 Villigen PSI, Switzerland