• Schmeißer, M.: Emittance Measurements of a Superconducting High Frequency Electron Gun. , 2013

Open Access Version  (available 01.01.3000)

Abstract:
Synchrotron light sources are of vital importance to modern spectroscopy and surface science. Due to their unique properties combination of uniformly high brightness and brilliance over a wide frequency range, synchrotron light sources nd broad application in solid-state surface science, chemistry, biology and life science[1]. In a linear accelerator based light source, the properties of the electron beam that emits synchrotron radiation are largely de ned at the rst stages of beam production and acceleration. Especially, for prospected future light sources, such as X-Ray Free Electron Lasers (FELs) and Energy Recovery Linacs (ERLs), initial beam parameters are key factors of performance because no damping as in storage rings occurs. In an e ort to explore research and development areas required for future ERL design and operation, the demonstration facility BERLinPro will be built at Helmholtz Zentrum Berlin. It will demonstrate feasibility of the ERL concept in a parameter scale envisaged for X-ray facilities. The superconducting radio frequency (SRF) photo electron gun is one promising concept to deliver electron beams of the desired quality of ultra-low emittance below 1mmmrad and high average current in the order of 100 mA. Gun 0.2 is a demonstration project to explore the generation of a low current beam from a photoinjector where cathode, cavity and solenoid are all superconducting. Cavity operation at high gradients was demonstrated, albeit at low beam loading and a low duty cycle. In order to investigate and understand the in uence of gun design, cathode preparation and operational parameters on the beam quality it is important to have reliable and accurate beam diagnostics available. The focus of this work was thus to employ the available diagnostic beam line of the current gun demonstrator to characterize the transverse phase space of the beam and measure the emittance at various beam settings and operation conditions. Slit mask and solenoid scanning techniques are applied.