• Rudolph, J.; Abo-Bakr, M.; Kamps, T.; Teichert, J.: Slice-Emittance Measurements at ELBE / SRF-Injector. In: Michaela Marx ... [Ed.] : 10th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, DIPAC2011, Hamburg, Germany, May 16 - 18, 2011Hamburg: DESY, 2011, p. 416-418


Abstract:
The linear accelerator ELBE delivers high-brightness electron bunches to multiple user stations, including two IR-FELs. The current thermionic injector is being amended by a superconducting rf photoinjector (SRF-injector)which promises higher beam quality. Using an injection beamline, beam from the SRF-injector can be injected into the ELBE linac. Detailed characterization of the electron beam is achieved by measuring the vertical slice emittance of the beam. To perform this measurement a combination of rf zero-phasing, spectrometer dipole and quadrupole scan is used. The electron beam is accelerated by the first cavity of the ELBE accelerator module and sent through a second cavity which is operated at zero-crossing of the rf. In doing so a linear energy-time correlation is induced in the beam. The chirped beam is sent through a spectrometer dipole and the longitudinal distribution can be made visible on a scintillator screen. Performing a quadrupole scan allows the determination of the emittance for different slices. This paper explains the working principle of the method, the experimental setup and presents first results for both simulations and measurement.