@article{FoersterLindenauLeyendeckeretal.2015,
  author    = {F{\"o}rster, Daniel F. and Lindenau, Bernd and Leyendecker, Marko and Janssen, Franz and Winkler, Carsten and Schumann, Frank O. and Kirschner, Juergen and Holldack, Karsten and F{\"o}hlisch, Alexander},
  title     = {Phase-locked MHz pulse selector for x-ray sources},
  series = {Optics letters : a publication of the Optical Society of America},
  volume    = {40},
  journal   = {Optics letters : a publication of the Optical Society of America},
  number    = {10},
  publisher = {Optical Society of America},
  address   = {Washington},
  issn      = {0146-9592},
  doi       = {10.1364/OL.40.002265},
  pages     = {2265 -- 2268},
  year      = {2015},
  abstract  = {Picosecond x-ray pulses are extracted with a phase-locked x-ray pulse selector at 1.25 MHz repetition rate from the pulse trains of the accelerator-driven multiuser x-ray source BESSY II preserving the peak brilliance at high pulse purity. The system consists of a specially designed in-vacuum chopper wheel rotating with approximate to 1 kHz angular frequency. The wheel is driven in an ultrahigh vacuum and is levitated on magnetic bearings being capable of withstanding high centrifugal forces. Pulses are picked by 1252 high-precision slits of 70 mu m width on the outer rim of the wheel corresponding to a temporal opening window of the chopper of 70 ns. We demonstrate how the electronic phase stabilization of +/- 2 ns together with an arrival time jitter of the individual slits of the same order of magnitude allows us to pick short single bunch x-ray pulses out of a 200 ns ion clearing gap in a multibunch pulse train as emitted from a synchrotron facility at 1.25 MHz repetition rate with a pulse purity below the shot noise detection limit. The approach is applicable to any high-repetition pulsed radiation source, in particular in the x-ray spectral range up to 10 keV. The opening window in a real x-ray beamline, its stability, as well as the limits of mechanical pulse picking techniques in the MHz range are discussed. (C) 2015 Optical Society of America},
  language  = {en}
}