Predictive outlook for experiments resolving prompt vs local redeposition of high-Z materials in tokamaks

D. C. Easley; C. A. Johnson; A. Diaw; T. R. Younkin; D. C. Donovan; E. A. Unterberg; S. Abe

doi:10.1088/1361-6587/adb64a

Predictive outlook for experiments resolving prompt vs local redeposition of high-Z materials in tokamaks

D. C. Easley, C. A. Johnson, A. Diaw, T. R. Younkin, D. C. Donovan, E. A. Unterberg, S. Abe

Research output: Contribution to journal › Article › peer-review

Abstract

High-Z plasma facing components redeposit within the sheath through a combination of two distinct mechanisms: prompt (or geometric-driven) and local (or sheath-driven) redeposition. Experimental efforts are needed to determine the leading-order parameters influencing prompt-vs-local trade-off, which sets the fraction of material entering the scrape-off layer. In preparation for such experiments, leading-order parameters are isolated within the PYEAD-RustBCA-GITR coupled net erosion code using Sobol’ sensitivity analysis. Then, experiments resolving prompt-vs-local trade-off under variation of these leading-order parameters are proposed using an isotopic coupon design with multifaceted diagnostic coverage. The measurability of these experiments is evaluated using synthetic diagnostics.

Original language	English
Article number	035023
Journal	Plasma Physics and Controlled Fusion
Volume	67
Issue number	3
DOIs	https://doi.org/10.1088/1361-6587/adb64a
State	Published - Mar 2025

Funding

Our work was supported in part by the SCGSR 2020 Solicitation 2 award and US DOE Contracts DE-SC0019256 and DE-AC05-00OR2272. Further support was provided by the US DOE FES Postdoctoral Research Program administered by ORISE under DOE contract DE-SC0014664.

Keywords

B-to-PFC pitch angle
design of experiment
high-Z redeposition
net erosion sensitivity
plasma material interaction
synthetic diagnostics

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10.1088/1361-6587/adb64a

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title = "Predictive outlook for experiments resolving prompt vs local redeposition of high-Z materials in tokamaks",

abstract = "High-Z plasma facing components redeposit within the sheath through a combination of two distinct mechanisms: prompt (or geometric-driven) and local (or sheath-driven) redeposition. Experimental efforts are needed to determine the leading-order parameters influencing prompt-vs-local trade-off, which sets the fraction of material entering the scrape-off layer. In preparation for such experiments, leading-order parameters are isolated within the PYEAD-RustBCA-GITR coupled net erosion code using Sobol{\textquoteright} sensitivity analysis. Then, experiments resolving prompt-vs-local trade-off under variation of these leading-order parameters are proposed using an isotopic coupon design with multifaceted diagnostic coverage. The measurability of these experiments is evaluated using synthetic diagnostics.",

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AU - Johnson, C. A.

AU - Diaw, A.

AU - Younkin, T. R.

AU - Donovan, D. C.

AU - Unterberg, E. A.

AU - Abe, S.

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AB - High-Z plasma facing components redeposit within the sheath through a combination of two distinct mechanisms: prompt (or geometric-driven) and local (or sheath-driven) redeposition. Experimental efforts are needed to determine the leading-order parameters influencing prompt-vs-local trade-off, which sets the fraction of material entering the scrape-off layer. In preparation for such experiments, leading-order parameters are isolated within the PYEAD-RustBCA-GITR coupled net erosion code using Sobol’ sensitivity analysis. Then, experiments resolving prompt-vs-local trade-off under variation of these leading-order parameters are proposed using an isotopic coupon design with multifaceted diagnostic coverage. The measurability of these experiments is evaluated using synthetic diagnostics.

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Predictive outlook for experiments resolving prompt vs local redeposition of high-Z materials in tokamaks

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