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Development and first operation of a cavity ring down spectroscopy diagnostic in the negative ion source SPIDER
M Barbisan1, R Pasqualotto1, R Agnello2
1Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy.
The Review of Scientific Instruments
|July 10, 2021
Summary
The SPIDER experiment uses cavity ring down spectroscopy to measure negative ion density in ITER
Area of Science:
- Plasma physics
- Fusion energy research
- Particle accelerator technology
Background:
- ITER requires negative ion sources for neutral beam injection.
- The SPIDER experiment is a prototype for these sources, using a radio frequency plasma and a 100 kV acceleration system.
- Maximizing extracted current density is crucial for ITER's performance.
Purpose of the Study:
- To present the cavity ring down spectroscopy (CRDS) diagnostic setup in the SPIDER experiment.
- To measure negative ion density near the acceleration system.
- To correlate these measurements with source parameters.
Main Methods:
- Utilized a cavity ring down spectroscopy diagnostic for line-integrated negative ion density measurements.
- Employed H-/D- photo-detachment by laser pulse absorption within an optical cavity.
- Correlated CRDS measurements with operational parameters of the SPIDER ion source.
Main Results:
- Successfully implemented and operated the CRDS diagnostic in the SPIDER experiment.
- Obtained initial measurements of negative ion density.
- Established correlations between negative ion density and key source parameters.
Conclusions:
- The CRDS diagnostic is effective for measuring negative ion density in the SPIDER experiment.
- Understanding negative ion density distribution is vital for optimizing ITER's neutral beam injectors.
- These findings contribute to the development of efficient negative ion sources for fusion energy.
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