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Monitoring electron energies during FLASH irradiations.

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A new device non-interceptively monitors electron beam energy variations during linac irradiations. This ensures accurate dose distribution for critical applications like FLASH pre-clinical studies.

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Area of Science:

  • Medical Physics
  • Accelerator Physics
  • Radiation Oncology

Background:

  • Electron beam energy is critical for dose distribution in tissue irradiations, especially in FLASH pre-clinical studies.
  • Linear accelerators (linacs) often experience beam loading, causing energy reduction with output current changes, necessitating radio frequency system tuning.
  • Accurate monitoring of electron beam energy is crucial for consistent and reliable radiation delivery.

Purpose of the Study:

  • To develop and validate a robust, non-interceptive device for monitoring electron beam energy variations in real-time.
  • To provide a practical solution for ensuring consistent beam energy during linac-based irradiations.
  • To enable precise dose distribution control in applications like FLASH radiotherapy.

Main Methods:

  • Utilized two unbiased aluminum annular charge collection plates positioned in the fringe electron beam path.
  • Incorporated thin annular screening plates to prevent crosstalk and equalize capacitances.
  • Analyzed the ratio of charges collected on downstream and total plates, correlating it with beam energy and spectrum shape.
  • Optimized energy sensitivity by adjusting the thickness of the first collection plate.

Main Results:

  • Demonstrated that the charge ratio is sensitive to electron beam energy and spectral shape changes.
  • Presented simulation and measurement data using a 6 MeV linac.
  • Validated the device's capability for non-interceptive, real-time energy monitoring on a macro-pulse basis.

Conclusions:

  • The developed monitor provides a reliable and easy-to-use method for real-time electron beam energy assessment during linac operations.
  • This technology can significantly improve the precision and reproducibility of radiation dosimetry in pre-clinical and clinical settings.
  • The device's design allows for practical implementation and optimization for specific beam energies.