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Plasma-surface interaction in negative hydrogen ion sources.

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Cesium (Cs) addition boosts negative hydrogen ion source current, but continuous operation depletes Cs. This is due to Cs adsorption and desorption on the plasma grid, impacting ion source performance and Cs consumption.

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Area of Science:

  • Plasma Physics
  • Surface Science
  • Ion Source Technology

Background:

  • Negative hydrogen ion sources are crucial for fusion energy research.
  • Cesium (Cs) introduction enhances beam current but leads to Cs depletion over time.
  • Understanding Cs behavior on the plasma grid is key to optimizing source operation.

Purpose of the Study:

  • Investigate the mechanism of Cs consumption in negative hydrogen ion sources.
  • Correlate plasma-grid interactions with Cs adsorption and desorption dynamics.
  • Analyze factors influencing Cs removal rate during ion source discharge.

Main Methods:

  • Experimental analysis of Cs behavior within a negative hydrogen ion source.
  • Observation of beam current changes in relation to Cs addition and operational time.
  • Correlation of Cs consumption with plasma-grid surface interactions.

Main Results:

  • Continuous operation leads to a reduction in beam current due to Cs depletion.
  • Adsorption and ion-induced desorption of Cs on the plasma grid explain the observed current decrease.
  • Deuterium operation is predicted to increase Cs consumption compared to hydrogen.
  • Medium mass impurities and source wall ions accelerate Cs removal.

Conclusions:

  • Plasma-grid surface interactions critically influence Cs consumption in negative hydrogen ion sources.
  • Optimizing Cs usage requires managing adsorption-desorption processes and minimizing impurity-induced removal.
  • Understanding these dynamics is essential for sustained high-current negative ion beams.