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Study of correlation between plasma parameter and beam optics.

M Kisaki1, H Nakano1, K Tsumori1

  • 1National Institute for Fusion Science, Toki, Gifu 509-5292, Japan.

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Summary
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Understanding negative ion source plasma is key for fusion energy. This study reveals negative ion density, not bias voltage, governs meniscus formation, similar to positive ion sources.

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Area of Science:

  • Plasma physics
  • Fusion energy research

Background:

  • Negative ion sources are crucial for heating fusion plasmas.
  • Meniscus formation in these sources impacts beam quality and efficiency.
  • Understanding plasma parameters is vital for optimizing negative ion beam extraction.

Purpose of the Study:

  • To identify the key plasma parameter controlling meniscus formation in negative ion sources.
  • To investigate the relationship between plasma parameters and extracted beam characteristics.
  • To compare meniscus formation mechanisms in negative and positive ion sources.

Main Methods:

  • Simultaneous measurement of negative ion source plasma and extracted beam properties.
  • Controlled variation of plasma parameters by adjusting discharge power and bias voltage.
  • Analysis of beam width dependence on negative ion density and other plasma parameters.

Main Results:

  • Beam width correlates directly with negative ion density across different bias voltages.
  • Other plasma parameters show varying influence on beam width depending on bias voltage.
  • A consistent relationship between beam width and negative ion density was observed.

Conclusions:

  • Negative ion density is the primary factor governing meniscus formation.
  • The mechanism of meniscus formation in negative ion sources is analogous to that in positive ion sources.
  • This finding aids in optimizing negative ion sources for fusion applications.