TUBP01
RIKEN/SPring-8, Hyogo, Japan
*K. Tono, T. Kudo, M. Yabashi, T. Tachibana, Y. Feng, D. Fritz, J. Hastings, and T. Ishikawa, Rev. Sci. Instrum. 82, 023108 (2011).
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TUBP01 |
Photon Beam Diagnostics for Free Electron Laser | |
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In a linac-based free electron laser (FEL), photon beam diagnostics is not only for characterizing output radiation properties, but also plays a crucial role in the machine tuning. Important requirements that have to be met in the diagnostics are pulse-resolved and nondestructive measurement in order to take shot-by-shot correspondence between multiple parameters of electron bunch and photon pulse. We have developed pulse-resolved and nondestructive monitors for a SASE beam of the Japanese XFEL facility, SACLA. For cascade monitoring of multiple parameters of a single photon pulse, our monitors detect only fractional photons scattered and/or diffracted from an X-ray transparent foil or gas, providing a center-of-mass position with an about 10-μm resolution,* a spatial beam profile, and a photon energy. Currently we are extending the photon diagnostics to fully characterize the SASE beam in the six dimensional phase space; that is, spatiotemporal intensity distribution, divergence, and spectrum. In my talk, I will introduce our existing and forthcoming photon diagnostic systems that will allow us to establish an effective tuning procedure for the XFEL machine.
*K. Tono, T. Kudo, M. Yabashi, T. Tachibana, Y. Feng, D. Fritz, J. Hastings, and T. Ishikawa, Rev. Sci. Instrum. 82, 023108 (2011). |
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Slides TUBP01 [1.871 MB] | |