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Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
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A compact neutron generator using a field ionization source.

Arun Persaud1, Ole Waldmann, Rehan Kapadia

  • 1E.O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. APersaud@lbl.gov

The Review of Scientific Instruments
|March 3, 2012
PubMed
Summary
This summary is machine-generated.

Field ionization using carbon nano-fiber field emitters is explored for compact neutron sources. High-density emitter arrays were fabricated and tested, addressing uniformity and durability for improved performance.

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Area of Science:

  • Materials Science
  • Physics
  • Engineering

Background:

  • Field ionization is a key process for generating ions.
  • Compact and rugged neutron sources are desirable for various applications.
  • Carbon nano-fibers offer potential for high field-enhancement factors.

Purpose of the Study:

  • To investigate the use of field ionization with carbon nano-fiber field emitters for neutron sources.
  • To fabricate and characterize high-density arrays of field emitters.
  • To address challenges related to uniformity and emitter lifetime.

Main Methods:

  • Fabrication of carbon nano-fiber arrays with densities up to 10^6 tips/cm^2.
  • Measurement of electron field emission performance characteristics.
  • Investigation of nano-fiber coating strategies for enhanced properties.

Main Results:

  • Successful fabrication of high-density carbon nano-fiber field emitter arrays.
  • Characterization of field emission performance.
  • Discussion of uniformity issues and potential solutions.

Conclusions:

  • Carbon nano-fiber arrays show promise for efficient field ionization in compact neutron sources.
  • Further research on uniformity and surface modifications is needed to optimize performance and lifetime.