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Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

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Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
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Related Experiment Video

Updated: Dec 31, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

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An automatic beam alignment system based on relative reference points for Thomson scattering diagnosis system.

Wei-Qiang Tan1, Peng Yuan1, Peng Wang1

  • 1Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

The Review of Scientific Instruments
|January 3, 2020
PubMed
Summary

An automatic beam alignment system was developed for Thomson scattering diagnostics. This system corrects beam misalignment in under 20 seconds, enhancing laser pointing stability for fusion experiments.

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Area of Science:

  • Plasma physics
  • Optical engineering
  • Instrumentation

Background:

  • Accurate beam alignment is crucial for Thomson scattering diagnostics in fusion devices like the Keda Torus eXperiment.
  • Stray light and long-term laser pointing drift can significantly degrade diagnostic performance.

Purpose of the Study:

  • To develop an automated system for precise alignment of the Thomson scattering probe beam.
  • To compensate for beam deviations and long-term laser pointing instability.

Main Methods:

  • Utilized relative reference points defined by apertures with glowing fiber tips.
  • Employed CMOS cameras for real-time monitoring of beam deviations.
  • Implemented a LabVIEW-based control system with piezomotor mirror mounts for automated correction.

Main Results:

  • Achieved automatic beam misalignment correction in less than 20 seconds.
  • Suppressed long-term laser pointing drift to within ±10 μrad.
  • Demonstrated capability to correct camera shifts up to approximately 2.3 mm.

Conclusions:

  • The developed automatic beam alignment system enhances the reliability and accuracy of Thomson scattering measurements.
  • This automated system is essential for maintaining optimal diagnostic performance in dynamic experimental environments.