Coherent Synchrotron Radiation Diagnostics for Investigating the Longitudinal Microbunching Instability at Diamond Light Source. / Shields, William.

2016. 154 p.

Research output: ThesisDoctoral Thesis

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@phdthesis{bc35fc348adb4a98bf870a9ceaaa72f0,
title = "Coherent Synchrotron Radiation Diagnostics for Investigating the Longitudinal Microbunching Instability at Diamond Light Source",
abstract = "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.",
author = "William Shields",
year = "2016",
language = "English",
school = "Royal Holloway, University of London",

}

RIS

TY - THES

T1 - Coherent Synchrotron Radiation Diagnostics for Investigating the Longitudinal Microbunching Instability at Diamond Light Source

AU - Shields, William

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

M3 - Doctoral Thesis

ER -