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@INPROCEEDINGS{Breede:166071,
      author       = {Breede, Heiko and Sachwitz, Martin and Grabosch,
                      Hans-Juergen},
      title        = {{A} new compact {D}esign of a three-dimensional
                      {I}onization {P}rofile {M}onitor ({IPM})},
      reportid     = {DESY-2014-01004},
      year         = {2013},
      abstract     = {The Free Electron Laser FLASH at the German Electron
                      Synchrotron (DESY) in Hamburg is a linear accelerator, which
                      uses superconducting technology to produce soft x-ray laser
                      light ranging from 4,1 to 45 nm. To ensure the operation
                      stability of FLASH, monitoring of the beam is mandatory.
                      Among various detectors located at the beam pipe, two
                      Ionization Profile Monitors (IPM) detect the lateral x and y
                      position changes. The functional principle of the IPM is
                      based on the detection of electrons, generated by
                      interaction of the photon beam with the residual gas in the
                      beam line. The newly designed IPM enables the combined
                      determination of the FEL’s horizontal and vertical
                      position as well as the beam’s profile. This is made
                      possible by a compact monitor, consisting of a cage in a
                      vacuum chamber, two micro-channel plates (MCP) and two
                      structural repeller plates with toggled electric fields at
                      the opposite sides of the MCPs. The electrons created by the
                      FEL beam, drift in a homogenous electrical field towards the
                      respective micro-channel plate, which produces an image of
                      the beam profile on an attached phosphor screen. A CCD
                      camera for each MCP in combination with a computer is used
                      for the evaluation. This indirect detection scheme operates
                      over a wide dynamic range and allows the detection of the
                      center of gravity and the shape of the photon beam without
                      affecting the FEL beam. Exact knowledge of the path taken by
                      the electrons permits a recursive determination of the beam
                      position. Within a beam variance of less than 10 mm, an
                      accuracy better than ±8 um seems to be possible.},
      month         = {Apr},
      date          = {2013-04-15},
      organization  = {SPIE Optics + Optoelectronics:
                       Advances in X-ray Free-Electron Laser
                       Instrumentation, Prague (Czech
                       Republic), 15 Apr 2013 - 18 Apr 2013},
      cin          = {ZEU-DLAB / ZEU-XFEL},
      cid          = {I:(DE-H253)ZEU-DLAB-20130226 /
                      I:(DE-H253)ZEU-XFEL-20120731},
      pnm          = {PETRA Beamline P04 (POF2-54G14) / FLASH Beamline BL1
                      (POF2-54G16)},
      pid          = {G:(DE-H253)POF2-P04-20130405 /
                      G:(DE-H253)POF2-BL1-20130405},
      experiment   = {EXP:(DE-H253)P-P04-20150101 / EXP:(DE-H253)F-BL1-20150101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/166071},
}