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Prospects for the Thomson scattering system on NSTX-Upgrade
A Diallo1, B P LeBlanc, G Labik
1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451, USA. adiallo@pppl.gov
The Thomson system on the National Spherical Torus Experiment (NSTX-U) will have its collecting fibers displaced by 1 cm. This configuration is expected to accurately measure electron temperature in NSTX-U plasma discharges.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Optical Diagnostics
Background:
- The National Spherical Torus Experiment Upgrade (NSTX-U) requires precise plasma diagnostics.
- The Thomson scattering system is crucial for measuring electron temperature in fusion devices.
Purpose of the Study:
- To detail the projected configuration of the Thomson scattering system on NSTX-U.
- To assess the impact of optical component displacement on system performance.
Main Methods:
- Optical modeling of collection optics.
- In-vessel measurements to validate optical models.
- Performance estimation for electron temperature measurements.
Main Results:
- Collecting fibers are displaced by at most 1 cm toward the imaging plane along the optical axis.
- The proposed configuration is validated through optical modeling and in-vessel measurements.
Conclusions:
- The Thomson system's configuration on NSTX-U is finalized.
- The system is projected to perform effectively in measuring electron temperature for NSTX-U discharges.
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