Coherent Synchrotron Radiation Diagnostics for Investigating the Longitudinal Microbunching Instability at Diamond Light Source

William Shields

Research output: ThesisDoctoral Thesis

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A setup for measurements of Coherent Synchrotron Radiation (CSR) to investigate the longitudinal Microbunching Instability has been designed and installed in the storage ring of Diamond Light Source (DLS). Third generation light sources such as DLS are known to be susceptible to a phenomenon called the Microbunching Instability, where bursts of CSR are observed above a threshold bunch current, the wavelengths of which are of the order of the bunch length and smaller. Above threshold, these bursts appear quasi- periodic, however at high bunch currents the emissions appear chaotically. Diamond Light Source can operate with bunches as short as a few picoseconds, making bunch profile mea- surements particularly challenging. Ultra-fast room temperature Schottky Barrier Diodes were employed to measure the emitted CSR spectrum in a Michelson Interferometer. The measured CSR spectrum can then be used to reconstruct the longitudinal bunch profile. Studies were conducted to measure the CSR spectrum for an increasing bunch current to investigate how the emitted spectrum varies as the instability is triggered and evolves into the chaotic bursting regime.
Original languageEnglish
Awarding Institution
  • Royal Holloway, University of London
  • Karataev, Pavel, Supervisor
Award date4 Mar 2016
Publication statusUnpublished - 2016

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