研究目的
To demonstrate the application of the PHASE software tool for physical optics simulations, including new features for performance predictions with diffraction effects, on the ARAMIS 1 beamline at SwissFEL.
研究成果
The PHASE package is a powerful tool for physical optics simulations in synchrotron and FEL optics, successfully demonstrated with start-to-end simulations for the SwissFEL ARAMIS 1 beamline. Results show good agreement with geometrical optics, confirming the accuracy of the new features. Future work could include time-resolved simulations and implementation of crystal optics.
研究不足
The simulations assume specific conditions such as the saturation point at the end of the undulator and use of measured figure errors, which may not capture all real-world variations. The method requires careful grid adjustments and high computational resources, potentially limiting accessibility.
1：Experimental Design and Method Selection:
The study uses the PHASE software for physical optics simulations based on the stationary phase approximation method. It involves propagating an electrical field distribution from the GENESIS FEL simulation code through the beamline optics, incorporating features like figure errors, coatings, and Fourier optics propagators.
2：Sample Selection and Data Sources:
The source is an X-ray pulse from the SwissFEL ARAMIS undulator, with parameters calculated by GENESIS at 12.4 keV photon energy and 0.2 mJ pulse energy. Measured figure errors from a real mirror are used.
3：4 keV photon energy and 2 mJ pulse energy. Measured figure errors from a real mirror are used.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Software tools include PHASE, GENESIS, and IDL for simulations. Optical elements such as mirrors with Mo/B4C coatings are modeled.
4：Experimental Procedures and Operational Workflow:
The simulation involves reading the electrical field from a file, scaling for reflectivity, resizing grids, propagating through beamline sections using Fourier optics and stationary phase approximation methods, and analyzing intensity and phase distributions at various positions.
5：Data Analysis Methods:
Results are analyzed for spot size (FWHM), power, intensity maximum, and compared with geometrical optics simulations to confirm accuracy.
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