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Laser beam pointing stabilization using analog position-sensitive diodes.

L Chapman1, V Tzoganis2, S Murray2

  • 1Electrical and Computer Engineering Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA.

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|August 7, 2025
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Summary
This summary is machine-generated.

An upgraded laser beam stabilization system using analog position-sensitive diodes (PSDs) enhances ion beam measurements at the Spallation Neutron Source. This new system offers improved radiation tolerance and a wider bandwidth for more precise diagnostics.

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Area of Science:

  • Particle accelerators
  • Beam diagnostics
  • Optics and photonics

Background:

  • Laser wire scanners are crucial for ion beam profile and emittance measurements at the Spallation Neutron Source linear accelerator.
  • Long propagation distances necessitate robust laser beam stabilization for reliable measurements.
  • Previous stabilization systems used digital cameras, limiting bandwidth and radiation tolerance.

Purpose of the Study:

  • To present an upgraded laser beam pointing stabilization system.
  • To improve radiation tolerance and operational bandwidth for beam diagnostics.
  • To enhance the precision of ion beam measurements in accelerators.

Main Methods:

  • Implementation of analog position-sensitive diodes (PSDs) as the primary position detector.
  • Optimization of the system with an optical diffuser for enhanced performance.
  • Utilizing a 60-Hz burst mode laser for dynamic stabilization.

Main Results:

  • The upgraded system demonstrates an order-of-magnitude improvement in radiation tolerance compared to previous methods.
  • Bandwidth is significantly increased, limited only by the laser's burst repetition rate.
  • Suppression of laser beam drifts up to 30 Hz, a substantial improvement over the previous 4 Hz limit.
  • Reduction of spectral components below 0.1 Hz by over a factor of 100.

Conclusions:

  • The upgraded PSD-based stabilization system offers superior performance for laser wire scanners in accelerator environments.
  • Enhanced radiation tolerance and bandwidth enable more reliable and precise ion beam measurements.
  • This advancement is critical for optimizing operations and diagnostics at facilities like the Spallation Neutron Source.