Spatial heterodyne spectroscopy for fast local magnetic field measurements of magnetized fusion plasmas

A novel spectroscopy diagnostic for measuring internal magnetic fields in high temperature magnetized plasmas has been developed. It involves spectrally resolving the Balmer-α (656 nm) neutral beam radiation split by the motional Stark effect with a spatial heterodyne spectrometer (SHS). The unique...

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Bibliographic Details
Published in:Review of scientific instruments 2023-03, Vol.94 (3), p.033504-033504
Main Authors: Burke, M. G., Fonck, R. J., Mckee, G. R., Winz, G. R.
Format: Article
Language:English
Subjects:
High temperature
Magnetic fields
Neutral beams
Performance prediction
Plasmas (physics)
Spectral resolution
Spectroscopic analysis
Spectrum analysis
Stark effect
Time measurement
Tokamak devices
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Summary:A novel spectroscopy diagnostic for measuring internal magnetic fields in high temperature magnetized plasmas has been developed. It involves spectrally resolving the Balmer-α (656 nm) neutral beam radiation split by the motional Stark effect with a spatial heterodyne spectrometer (SHS). The unique combination of high optical throughput (3.7 mm2sr) and spectral resolution (δλ ∼ 0.1 nm) allows these measurements to be made with time resolution ≪1 ms. The high throughput is effectively utilized by incorporating a novel geometric Doppler broadening compensation technique in the spectrometer. The technique significantly reduces the spectral resolution penalty inherent to using large area, high-throughput optics while still collecting the large photon flux provided by such optics. In this work, fluxes of order 1010 s−1 support the measurement of deviations of
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0127165