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Development of Marx adder based solid-state electron gun modulator
Umakant Yerge1,2, Abhijit Tillu2, Arka Mitra1,2
1Homi Bhabha National Institute, Mumbai 400094, India.
The Review of Scientific Instruments
|August 5, 2026
Summary
A new solid-state Marx adder-based modulator was developed for electron guns. This high-voltage pulse modulator offers precise control over electron beam generation parameters for accelerators.
Area of Science:
- Accelerator Physics
- High-Voltage Engineering
- Pulsed Power Systems
Background:
- Electron guns are critical components in particle accelerators, requiring high-voltage pulse modulators for pulsed electron beam generation.
- Existing modulator technologies may face limitations in controlling pulse parameters for specific electron gun loads.
Purpose of the Study:
- To design, analyze, and implement a novel solid-state Marx adder-based gun modulator for a test-bench electron gun.
- To address the non-linear load characteristics of electron guns with a robust modulator design.
- To provide precise control over electron beam generation parameters such as pulse voltage, repetition rate, and pulse width.
Main Methods:
- Development of a solid-state Marx adder-based modulator.
- Innovative use of common-mode chokes for isolated charging of Marx stages.
- Design considerations and analysis focused on the non-linear load of the electron gun.
- Experimental validation using resistive and electron gun loads.
Main Results:
- The developed modulator successfully delivers pulses up to 40 kV, 3 A, with a 10 μs pulse width at a 200 Hz repetition rate.
- Demonstrated effective control over pulse voltage, repetition rate, and pulse width.
- Experimental validation confirmed the modulator's performance with both resistive and electron gun loads.
Conclusions:
- The novel solid-state Marx adder-based modulator is a viable solution for driving electron guns in accelerator applications.
- The design offers significant advantages in terms of control and adaptability to non-linear electron gun loads.
- This development enhances the capability for precise electron beam generation in research settings like the Electron Beam Center (EBC).
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