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Note: Coaxial-heater hollow cathode.

Huseyin Kurt1, Ugur Kokal2, Nazli Turan2

  • 1Department of Engineering Physics, Istanbul Medeniyet University, Istanbul, Turkey.

The Review of Scientific Instruments
|July 3, 2017
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Summary
This summary is machine-generated.

A novel heater design for lanthanum hexaboride (LaB6) hollow cathodes eliminates hot spots and overheating. This improved design successfully delivers stable currents ranging from 0.5-15 A.

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Area of Science:

  • Materials Science
  • Plasma Physics
  • Electrical Engineering

Background:

  • Lanthanum hexaboride (LaB6) hollow cathodes are crucial electron sources in various applications.
  • Conventional heater designs can suffer from hot spots and terminal overheating, impacting performance and lifespan.
  • Improving heater design is essential for reliable and efficient LaB6 cathode operation.

Purpose of the Study:

  • To present a novel heater design for LaB6 hollow cathodes.
  • To address and mitigate issues of hot spots and terminal overheating in the heater.
  • To evaluate the performance of the new cathode design in terms of current delivery.

Main Methods:

  • Designing a new heater configuration where the wire is fully encapsulated around the cathode tube and a coaxial return electrode.
  • Implementing Joule heating confinement to the LaB6 emitter region.
  • Conducting tests to assess the operational current range and stability of the cathode.

Main Results:

  • The novel heater design successfully eliminates hot spots on the heater wire by complete encapsulation.
  • Overheating of heater terminals is prevented by confining heat to the emitter region.
  • The LaB6 hollow cathode with the new heater design demonstrated stable operation and current delivery in the 0.5-15 A range.

Conclusions:

  • The encapsulated heater design offers a significant improvement for LaB6 hollow cathodes.
  • This design enhances reliability and operational stability by preventing common failure points.
  • The tested cathode is suitable for applications requiring controlled electron emission within the specified current range.