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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2512.15360 |
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| 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 |