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Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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Spatial distribution of the plasma parameters in a radio-frequency driven negative ion source
D Todorov1, Kh Tarnev2, Ts Paunska1
1Faculty of Physics, Sofia University, 5 J. Bourchier Blvd., Sofia BG-1164, Bulgaria.
The Review of Scientific Instruments
|March 6, 2014
Summary
Initial modeling of the SPIDER negative ion source for ITER shows the electron energy flux is key to forming the discharge structure. This research aids in developing advanced fusion energy technologies.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Ion Source Technology
Background:
- The SPIDER source is under development at Consorzio RFX for ITER.
- Accurate modeling is crucial for optimizing negative hydrogen/deuterium ion production.
Purpose of the Study:
- To present initial modeling results for the SPIDER negative ion source.
- To analyze plasma characteristics under specific operational conditions.
- To determine the role of electron energy flux in discharge formation.
Main Methods:
- A 2D fluid plasma model was employed.
- The model assumes low-pressure discharges in a free-fall regime.
- Simulations were conducted for SPIDER's planned conditions: 0.3 Pa gas pressure and 100 kW RF power.
Main Results:
- Spatial distributions of plasma characteristics were calculated.
- Key parameters include charged particle densities, electron temperature, and plasma potential.
- The electron energy flux was identified as a significant factor.
Conclusions:
- The electron energy flux plays a critical role in shaping the discharge structure.
- These findings inform the design and operation of the SPIDER source.
- The study contributes to advancing negative ion source technology for fusion applications.
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