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Feng, J.

Paper Title Page
FRPMS022 Progress on Modeling of Ultrafast X-Ray Streak Cameras 3961
  • G. Huang, J. M. Byrd, J. Feng, J. Qiang, W. Wan
    LBNL, Berkeley, California
  Streak cameras continue to be useful tools for studying ultra phenomena on the sub-picosecond time scale and beyond. We have employed accelerator modeling tools to understand the key parts of the streak camera in order to improve the time resolution. This effort has resulted in an start-to-end model of the camera including a dedicated 3D modeling of time-dependent fields. This model has contributed to the recent achievement of 230 fsec (FWHM) resolution measured using 266 nm laserat the Advanced Light Source Streak Camera Laboratory. We will report on our model and its comparison with experiments. We also extrapolate the performance of this camera including several possible improvements.  
FRPMS025 Streak Camera Temporal Resolution Improvement Using a Time-Dependent Field 3973
  • J. Qiang, J. M. Byrd, J. Feng, G. Huang
    LBNL, Berkeley, California
  Funding: This work was supported by the U. S. Department of Energy under Contract no. DE-AC02-05CH11231.

Streak camera is an important diagnostic device in the studies of laser plasma interaction, the detailed structure of photo reaction from material science to biochemistry, and in the measurement of the longitudinal distribution of a beam in accelerators. In this paper, we report on a new method which can potentially improve the temporal resolution of a streak camera down to femtoseconds. This method uses a time-dependent acceleration field to defocus the photo electrons longitudinally. This not only reduces the time dispersion distortion caused by initial energy spread but also mitigates the effects from the space-charge forces. An illustration of the method shows significant improvement of the modulation transfer function (MFT) compared with the conventional design.