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Updated: Jun 18, 2025
09:53
Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet VUV Synchrotron Radiation
Published on: October 30, 2012
12.9K
Design of a multichannel vacuum ultraviolet spectroscopy system for SPARC
I Song1, M L Reinke1, J L Raimond1
1Commonwealth Fusion Systems, Devens, Massachusetts 01434, USA.
The Review of Scientific Instruments
|August 1, 2024
Summary
A new vacuum ultraviolet spectroscopy system monitors impurities in SPARC, enabling real-time feedback for plasma control. This compact design enhances safety and ensures operational reliability for fusion energy research.
Area of Science:
- Plasma Physics
- Spectroscopy
- Fusion Energy Engineering
Background:
- SPARC requires advanced diagnostics for impurity control during deuterium-tritium operations.
- Effective monitoring is crucial for maintaining plasma stability and preventing disruptions.
Purpose of the Study:
- To design and validate a vacuum ultraviolet spectroscopy system for SPARC.
- To enable comprehensive impurity analysis in core and divertor regions.
- To support real-time feedback for plasma discharge control and disruption avoidance.
Main Methods:
- A flat-field spectrometer design covering 10-2000 Å with five lines of sight.
- Compact, vertically stacked modular units for space efficiency.
- Silicon carbide mirrors for divertor observation, validated by thermal and electromagnetic analysis.
- Safety features including helium enclosure and beamline shielding.
Main Results:
- The system allows comprehensive impurity analysis across SPARC's core and divertor regions.
- Compact design minimizes space requirements in the tokamak hall.
- Validated mirror survivability and appropriate millisecond exposure times for data acquisition.
- Demonstrated capability for real-time discharge control, including disruption avoidance.
Conclusions:
- The designed vacuum ultraviolet spectroscopy system is suitable for impurity control in SPARC.
- The system's design ensures safety, reliability, and operational efficiency.
- This diagnostic advancement contributes to the development of fusion energy.
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