Arc plasma generator of atomic driver for steady-state negative ion source

Area of Science:

• Plasma Physics
• Materials Science
• Ion Source Technology

Background:

• Development of efficient negative ion sources is crucial for various applications, including fusion energy research and materials processing.
• Existing plasma generators often face limitations in steady-state operation and control over atom energy.

Purpose of the Study:

• To review the development of a steady-state arc-discharge plasma generator with a directly heated lanthanum hexaboride (LaB6) cathode.
• To assess the generator's capability for producing an intensive atomic hydrogen jet for negative ion production.

Main Methods:

• Design and construction of a steady-state arc-discharge plasma generator with augmented water cooling.
• Utilizing a metallic plate with electrical biasing to control atom energies.
• Employing simulations to determine thermo-mechanical stresses and optimize magnetic fields.
• Conducting initial tests in long-pulse mode.

Main Results:

• Successful development of a steady-state arc-discharge plasma generator prototype.
• Demonstrated production of a plasma jet convertible to an atomic hydrogen jet.
• Optimization of magnetic fields to reduce power loads and enhanced water cooling for sustained operation.
• Initial prototype tests in long-pulse mode were successfully performed.

Conclusions:

• The developed steady-state arc-discharge plasma generator shows promise for efficient negative ion production.
• The generator's design, including water cooling and magnetic field optimization, supports long-pulse and steady-state operation.
• Further testing and development are warranted to fully exploit its potential in negative ion sources.