研究目的
Designing and testing stripline beam position monitors (BPMs) for the X-ray free-electron laser (XFEL) at Pohang Accelerator Laboratory (PAL-XFEL) to achieve strong signal, high resolution, and reduced signal reflection.
研究成果
The stripline BPMs designed for PAL-XFEL achieved a strong signal, high resolution, and reduced signal reflection. The wire test stand and real beam tests confirmed the BPMs' performance, with a resolution of 3 μm achieved, surpassing the requirement.
研究不足
The impedance matching was not perfect, leading to signal reflection. The method's applicability is limited by the stripline angular width being much smaller than the chamber wall circumference.
1：Experimental Design and Method Selection:
The design focused on optimizing the stripline angular width for signal strength and resolution, and impedance matching to reduce signal reflection. Simulation studies confirmed the design.
2：Sample Selection and Data Sources:
Fabricated BPMs were tested using a wire test stand to measure position sensitivity, linearity error, and offsets.
3：List of Experimental Equipment and Materials:
Wire test stand, signal generator, two-dimensional translation stage, motor controller, BPM electronics, and data acquisition computer.
4：Experimental Procedures and Operational Workflow:
Position sensitivity and linearity were measured by moving the translation stage and comparing BPM readings with encoder readings. Two-dimensional scans measured position errors and offsets.
5：Data Analysis Methods:
The resolution of the BPM system was measured using the three-BPM-correlation method, and the standard deviation of the Gaussian fitting curve provided the resolution.
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