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Development of a compact high-current repetitive pulsed x-ray system.

Ze-Qi Lyu1, Yan-Zhao Xie1, Yi Zhou1

  • 1State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, 710049 Xi'an, Shaanxi, China.

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This study introduces a compact, high-current, repetitive pulsed x-ray system capable of generating high dose rates below 100 keV. The system achieves stable operation, offering a significant advancement for applications requiring intense pulsed x-rays.

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Area of Science:

  • Physics
  • Engineering
  • Radiation Science

Background:

  • Pulsed x-rays are vital for radiography and studying radiation effects.
  • Existing systems often compromise between high dose rate and repetitive pulsing capability.
  • Sub-100 keV pulsed x-ray systems face limitations in dose rate or total dose in single-pulse or repetitive modes, respectively.

Purpose of the Study:

  • To develop a compact, high-current, repetitive pulsed x-ray system for high dose rate applications.
  • To generate pulsed x-rays with an average energy below 100 keV.
  • To achieve uniform x-ray output using a specialized diode design.

Main Methods:

  • Designed and tested a low-impedance diode with a double-ring cathode for uniform x-ray production.
  • Investigated x-ray intensity and repetition rate effects with varying anode thicknesses (five tested).
  • Operated the system at a repetitive rate of 0.2 Hz with peak voltage and current measurements.

Main Results:

  • The system achieved stable operation at 0.2 Hz, ~200 kV peak voltage, and ~100 kA peak current.
  • A dose rate of approximately 2.4 × 10^5 Gy(LiF)/s was recorded.
  • Average x-ray energy was ~55 keV with a 40 µm tantalum anode, and x-ray uniformity exceeded 2:1.

Conclusions:

  • The developed compact system effectively generates high dose rate, repetitive pulsed x-rays below 100 keV.
  • The double-ring cathode diode design ensures good x-ray uniformity.
  • This system offers a promising solution for applications needing intense, repetitive pulsed x-ray sources.