Disk-cathode flash X-ray tube driven by a repetitive two-stage Marx pulser

Area of Science:

• Physics
• Engineering
• Materials Science

Background:

• Flash X-ray generators are crucial for various applications requiring high-intensity, short-duration radiation.
• Optimizing the design of these generators is essential for improving performance and control.

Purpose of the Study:

• To conduct fundamental studies on a repetitive flash X-ray generator utilizing a disk-cathode radiation tube.
• To investigate the performance characteristics and control mechanisms of the developed generator.

Main Methods:

• Employed a modified two-stage surge-Marx circuit for high-voltage pulse generation.
• Utilized a demountable-diode flash X-ray tube with a tungsten anode and graphite disk cathode.
• Varied anode-cathode spacing to control peak tube voltage and photon energy.

Main Results:

• Achieved repetitive flash X-ray generation with a pulse width of 40-100 ns.
• Demonstrated control over maximum photon energy by adjusting the anode-cathode space.
• Observed peak tube current below 0.5 kA and X-ray intensity up to 1.1 microC kg-1 at 0.5 m.
• Repetition rate achieved was less than 50 Hz with an effective focal spot size matching the anode diameter.

Conclusions:

• The developed repetitive flash X-ray generator offers controllable photon energy and pulse characteristics.
• The disk-cathode radiation tube and Marx circuit are effective components for flash X-ray generation.
• Further optimization could enhance repetition rate and intensity for advanced applications.