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首页> 外文会议>Advances in X-ray free-electron lasers II: instrumentation >Beam characterization of FLASH from beam profile measurement by intensity transport equation and reconstruction of the Wigner distribution function
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Beam characterization of FLASH from beam profile measurement by intensity transport equation and reconstruction of the Wigner distribution function

机译：通过强度传输方程从光束轮廓测量到FLASH的光束表征，并重建Wigner分布函数

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摘要

Beam parameters of the free-electron laser FLASH @13.5 nm in two different operation modes were determined from beam profile measurements and subsequent reconstruction of the Wigner distribution function behind the ellipsoidal focusing mirror at beamline BL2. 40 two-dimensional single pulse intensity distributions were recorded at each of 65 axial positions around the waist of the FEL beam with a magnifying EUV sensitized CCD camera. From these beam profile data the Wigner distribution function based on different levels of averaging could be reconstructed by an inverse Radon transform. For separable beams this yields the complete Wigner distribution, and for beams with zero twist the information is still sufficient for wavefront determination and beam propagation through stigmatic systems. The obtained results are compared to wavefront reconstructions based on the transport of intensity equation. A future setup for Wigner distribution measurements of general beams is discussed.
机译：从电子束轮廓测量和随后在光束线BL2处的椭圆聚焦镜后面的维格纳分布函数的重建，确定了两种不同操作模式下的自由电子激光器FLASH @ 13.5 nm的光束参数。用放大的EUV敏化CCD相机在FEL束腰周围的65个轴向位置分别记录了40个二维单脉冲强度分布。从这些光束轮廓数据，可以通过反Radon变换重建基于不同平均水平的Wigner分布函数。对于可分离的光束，这会产生完整的Wigner分布，对于扭曲为零的光束，该信息仍然足以确定波前和通过像散系统的光束传播。将获得的结果与基于强度方程传输的波前重建进行比较。讨论了一般光束的Wigner分布测量的未来设置。

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  • 来源
  • 会议地点 Prague(CZ)
  • 作者

    Bernd Schaefer; Tobias Mey; Klaus Mann; Barbara Keitel; Svea Kreis; Marion Kuhlmann; Elke Ploenjes; Kai Tiedtke;

  • 作者单位

    Laser-Laboratorium Goettingen, Hans-Adolf-Krebs-Weg 1, 37077 Goettingen, Germany;

    Laser-Laboratorium Goettingen, Hans-Adolf-Krebs-Weg 1, 37077 Goettingen, Germany;

    Laser-Laboratorium Goettingen, Hans-Adolf-Krebs-Weg 1, 37077 Goettingen, Germany;

    Deutsches Elektronen Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany;

    Deutsches Elektronen Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany;

    Deutsches Elektronen Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany;

    Deutsches Elektronen Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany;

    Deutsches Elektronen Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    wavefront; Wigner distribution; spatial coherence;

    机译：波前威格纳分布；空间连贯;

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