Determination of the mean energy of fast electron losses and anisotropies through thick-target emission on WEST

Barbui, T.; Delgado-Aparicio, L. F.; Stratton, B.; Chellaï, O.; Dumont, R.; Hill, K. W.; Pablant, N. A.; Savoye-Peysson, Y.

doi:10.1088/1741-4326/ad2f4e

Title: Determination of the mean energy of fast electron losses and anisotropies through thick-target emission on WEST

Journal Article · 15 March 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad2f4e · OSTI ID:2324693

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^[1]; Stratton, B. ^[1];

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^[1]; Savoye-Peysson, Y. ^[2]

Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
CEA, IRFM, Saint Paul Lez Durance (France)

A new method to obtain the mean energy of fast electron losses in fusion plasmas using a versatile multi-energy hard x-ray (HXR) detector is presented. The method is based on measuring the thick-target emission of tungsten in the divertor region produced by fast electron losses interacting with the target and modeling the tungsten spectra by a Monte Carlo code which simulates the interaction between a beam of electrons and a solid target. The mean energy of the fast electron losses is determined through the comparison between the experimental and synthetic emission. The results show that fast electron losses during lower hybrid current drive discharges at WEST have a mean energy of 90–140 keV and represent only 2% of the total heat flux at the target. Additionally, anisotropic HXR emission has been detected for the first time at the WEST core and edge plasma, with opposite directions. It is due to the forward-peak emission of two distinctive populations of fast electrons: co-current fast electrons in the core and counter-current fast electron losses at the inner strike point. In view of future experiments like ITER where electron cyclotron current drive will generate a fast electron population, this technique could serve as a real-time monitor of fast electron losses and eventually feed an actuator on the current drive generation.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE

Contributing Organization:: WEST Team

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2324693

Alternate ID(s):: OSTI ID: 2318601; OSTI ID: 2326050

Journal Information:: Nuclear Fusion, Vol. 64, Issue 5; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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