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Transmission grating based extreme ultraviolet imaging spectrometer for time and space resolved impurity measurements
Deepak Kumar1, Dan Stutman, Kevin Tritz
1Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA. deepak@pha.jhu.edu
The Review of Scientific Instruments
|November 2, 2010
Summary
A new extreme ultraviolet imaging spectrometer was created for the National Spherical Torus Experiment (NSTX). This instrument provides spectral measurements for impurity analysis in fusion plasmas.
Area of Science:
- Plasma Physics
- Spectroscopy
- Fusion Energy Research
Background:
- The National Spherical Torus Experiment (NSTX) requires advanced diagnostic tools for plasma characterization.
- Extreme ultraviolet (EUV) spectroscopy is crucial for understanding plasma impurities and their behavior.
Purpose of the Study:
- To develop and implement a novel free-standing transmission grating based imaging spectrometer for the NSTX.
- To enable spectral measurements in the EUV range (30-700 Å) for impurity diagnostics.
Main Methods:
- Design and construction of a transmission grating spectrometer.
- Operation in a survey mode for broad spectral coverage.
- Achieved a spectral resolving capability of approximately 3% (δλ/λ).
Main Results:
- Successful development of a free-standing imaging spectrometer for EUV measurements.
- Demonstrated capability to cover the spectral range from 30 to 700 Å.
- Initial data acquired from space-resolved impurity measurements on NSTX.
Conclusions:
- The developed spectrometer is a valuable diagnostic tool for NSTX.
- The instrument facilitates detailed analysis of plasma impurities.
- Future applications include enhanced understanding of fusion plasma dynamics.
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