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Diagnostic techniques of minimum-B ECR ion source plasma instabilities.
V Toivanen1, B S Bhaskar1, I V Izotov2
1Department of Physics, University of Jyväskylä (JYFL), 40500 Jyväskylä, Finland.
The Review of Scientific Instruments
|February 2, 2022
Summary
Plasma instabilities in Electron Cyclotron Resonance Ion Sources (ECRIS) affect beam stability. This study reviews diagnostic techniques to understand and mitigate these instabilities for improved ion beam performance.
Area of Science:
- Atomic and Plasma Physics
- Accelerator Science
Background:
- Electron Cyclotron Resonance Ion Sources (ECRIS) are crucial for producing ion beams.
- Traditionally, ECRIS performance is evaluated by beam current and quality.
- Recent advancements necessitate a focus on beam stability, particularly for high charge states and intensities.
Purpose of the Study:
- To review practical diagnostic techniques for identifying plasma instabilities in ECRIS.
- To link observed instability signals to underlying ECRIS plasma physics.
- To assess the advantages and disadvantages of various diagnostic methods.
Main Methods:
- Time-resolved microwave emission diagnostics
- Bremsstrahlung measurements
- Direct measurement of electron and ion fluxes
- Ion beam energy spread measurements
- Optical emission diagnostics
Main Results:
- Instabilities manifest as rapid, millisecond-scale oscillations in beam currents.
- Specific diagnostic signals correlate with different plasma instability phenomena.
- Each diagnostic technique presents unique benefits and limitations.
Conclusions:
- Understanding plasma instabilities is critical for advancing ECRIS technology.
- Further development of diagnostic tools is needed for enhanced ECRIS performance.
- Mitigating instabilities will enable higher ion charge states and beam intensities.
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