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Perpendicular and tangential angularly resolved multi-sight neutral particle analyzer system in LHD.
1National Institute for Fusion Science, 322-6, Oroshi, Toki, Gifu 509-5292, Japan. ozaki@nifs.ac.jp
The Review of Scientific Instruments
|November 7, 2012
Summary
Particle loss in helical plasma is measured using an angularly resolved multi-sightline neutral particle analyzer (ARMS). This system uses an AXUV detector to analyze energetic neutral particle distribution and investigate plasma confinement.
Area of Science:
- Plasma physics
- Fusion energy research
Background:
- Understanding particle and energy transport is crucial for magnetic confinement fusion.
- Helical plasmas present unique challenges for particle confinement due to their complex magnetic field geometry.
Purpose of the Study:
- To develop and validate a method for measuring particle loss in helical plasmas.
- To investigate the real-time neutral particle distribution and its relation to particle loss.
Main Methods:
- Utilizing an angularly resolved multi-sightline neutral particle analyzer (ARMS).
- Employing an AXUV detector, typically a UV monitor, as the particle detector within the ARMS.
- Operating two ARMS systems with perpendicular and tangential viewing angles.
Main Results:
- The ARMS system successfully measures the angular distribution of energetic neutral particles.
- Real-time neutral particle distribution data was obtained for helical plasma.
- The study provides a method to investigate particle loss mechanisms.
Conclusions:
- The ARMS is an effective diagnostic for studying particle loss in helical plasmas.
- The methodology allows for detailed analysis of particle transport and confinement.
- This research contributes to the understanding of plasma behavior in fusion devices.
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