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

Burke, M. G.; Fonck, R. J.; Mckee, G. R.; Winz, G. R.

doi:10.1063/5.0127165

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

Journal Article · Thu Mar 02 00:00:00 EST 2023 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0127165· OSTI ID:1970189

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Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
University of Wisconsin, Madison, WI (United States)

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 $$\ll$$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 <5 mT (Δ λ_Stark ~ 10^–4 nm) in the local magnetic field with 50 µs time resolution. Example high time resolution measurements of the pedestal magnetic field throughout the ELM cycle of a DIII-D tokamak plasma are presented. Local magnetic field measurements give access to the dynamics of the edge current density, which is essential to understanding stability limits, edge localized mode generation and suppression, and predicting performance of H-mode tokamaks.

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Research Organization:: General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC) Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: FC02-04ER54698; FG02-89ER53296; FG02-08ER54999; AC52-07NA27344

OSTI ID:: 1970189

Alternate ID(s):: OSTI ID: 1959370; OSTI ID: 2202912

Report Number(s):: LLNL-JRNL-839004; A29734; TRN: US2313488

Journal Information:: Review of Scientific Instruments, Vol. 94, Issue 3; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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

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