Ion Rotational Velocity Diagnostic for the Centrifugal Mirror Fusion eXperiment
POSTER
Abstract
A multi-chord ion Doppler spectroscopy (IDS) diagnostic has been designed for the Centrifugal Mirror Fusion eXperiment (CMFX), under construction at the University of Maryland, College Park. The cylindrical, mostly hydrogen CMFX plasma will be set into azimuthal E x B rotation via a radial electric field, generated by a coaxial inner electrode, and a solenoidal magnetic field. The resulting rotational velocity shear can suppress magnetohydrodynamic instabilities. Therefore, the measurement of ion rotational velocity profiles is critical to the characterization of the CMFX plasma. A fiber-optic array consisting of ten tangential viewing chords will be set up to take line-integrated spectroscopic measurements of the intensity, Doppler broadening, and Doppler shift of impurity helium emission (He II, 468.6 nm) at the midplane. The diagnostic can be moved to different positions along the axis of symmetry. Radial profiles of emissivity and rotational velocity can be obtained via an Abel-like matrix inversion of the spectra. We present the design of the IDS system and initial testing carried out on the Dusty Plasma Laboratory eXperiment (DPLX) at the University of Maryland, Baltimore County.
Presenters
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Zachary D Short
University of Maryland, College Park, IREAP, University of Maryland, College Park, MD 20742
Authors
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Zachary D Short
University of Maryland, College Park, IREAP, University of Maryland, College Park, MD 20742
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Nathan Eschbach
University of Maryland, Baltimore County, Department of Mechanical Engineering, University of Maryland, Baltimore County, MD 21250
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Brian Beaudoin
University of Maryland, College Park, IREAP, University of Maryland, College Park, MD 20742
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Carlos A Romero-Talamás
University of Maryland, Baltimore County, Department of Mechanical Engineering, University of Maryland, Baltimore County, MD 21250