Imagen de Portada

First implementation of AXUV-based analysis and macro-instability diagnostics on WHAM

Fuente: arXiv

Guardado en:

Detalles Bibliográficos
Autores principales:	Shih, K., Endrizzi, D., Sutherland, D. A., Anderson, J., Bindl, D., Claveau, E. L., Everson, C., Eickman, J., Frank, S. J., Marriott, E., Penne, E., Pizzo, J., Qian, T., Viola, J., Forest, C. B., Yakovlev, D.
Formato:	Preprint
Publicado:	2025
Materias:	Plasma Physics
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866911324299067392
author	Shih, K. Endrizzi, D. Sutherland, D. A. Anderson, J. Bindl, D. Claveau, E. L. Everson, C. Eickman, J. Frank, S. J. Marriott, E. Penne, E. Pizzo, J. Qian, T. Viola, J. Forest, C. B. Yakovlev, D.
author_facet	Shih, K. Endrizzi, D. Sutherland, D. A. Anderson, J. Bindl, D. Claveau, E. L. Everson, C. Eickman, J. Frank, S. J. Marriott, E. Penne, E. Pizzo, J. Qian, T. Viola, J. Forest, C. B. Yakovlev, D.
contents	Absolute extreme ultraviolet (AXUV) diode arrays are widely used in fusion experiments for time-resolved measurements of plasma radiation. We report the first implementation of an AXUV-based analysis framework on the Wisconsin High-Temperature Superconducting (HTS) Axisymmetric Mirror (WHAM). A single, precisely calibrated 20-channel AXUV assembly measures line-integrated plasma emission with $ 100~\mathrm{kHz}$ temporal resolution and $\sim1~\mathrm{cm}$ spatial accuracy across the mid-plane. The data were processed to obtain plasma's statistical moments, yielding time-resolved measurement of the centroid displacement $Φ(t)$ and effective radius $R(t)$. From the joint covariance of these quantities, we define a macroscopic instability parameter $χ(t)$, that quantifies large-scale plasma motion and profile evolution directly from AXUV observables. The parameter $χ$ serves as a compact indicator of global macroscopic instability, decreasing with increasing end-plate bias and exhibiting strong anti-correlation with diamagnetic flux during confinement transitions. These results demonstrate that a single AXUV array can provide quantitative, real-time assessment of macroscopic plasma instabilities, constituting the first demonstration of such capability in a magnetic mirror plasma. Future extensions to multiple arrays will further enhance spatial coverage and enable full-mode tracking in axisymmetric mirror configurations and related fusion devices.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_15360
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	First implementation of AXUV-based analysis and macro-instability diagnostics on WHAM Shih, K. Endrizzi, D. Sutherland, D. A. Anderson, J. Bindl, D. Claveau, E. L. Everson, C. Eickman, J. Frank, S. J. Marriott, E. Penne, E. Pizzo, J. Qian, T. Viola, J. Forest, C. B. Yakovlev, D. Plasma Physics Absolute extreme ultraviolet (AXUV) diode arrays are widely used in fusion experiments for time-resolved measurements of plasma radiation. We report the first implementation of an AXUV-based analysis framework on the Wisconsin High-Temperature Superconducting (HTS) Axisymmetric Mirror (WHAM). A single, precisely calibrated 20-channel AXUV assembly measures line-integrated plasma emission with $ 100~\mathrm{kHz}$ temporal resolution and $\sim1~\mathrm{cm}$ spatial accuracy across the mid-plane. The data were processed to obtain plasma's statistical moments, yielding time-resolved measurement of the centroid displacement $Φ(t)$ and effective radius $R(t)$. From the joint covariance of these quantities, we define a macroscopic instability parameter $χ(t)$, that quantifies large-scale plasma motion and profile evolution directly from AXUV observables. The parameter $χ$ serves as a compact indicator of global macroscopic instability, decreasing with increasing end-plate bias and exhibiting strong anti-correlation with diamagnetic flux during confinement transitions. These results demonstrate that a single AXUV array can provide quantitative, real-time assessment of macroscopic plasma instabilities, constituting the first demonstration of such capability in a magnetic mirror plasma. Future extensions to multiple arrays will further enhance spatial coverage and enable full-mode tracking in axisymmetric mirror configurations and related fusion devices.
title	First implementation of AXUV-based analysis and macro-instability diagnostics on WHAM
topic	Plasma Physics
url	https://arxiv.org/abs/2512.15360