Improvements to the Faraday cup fast ion loss detector and magnetohydrodynamic induced fast ion loss measurements in Joint European Torus plasmas

Bonofiglo, P. J.; Kiptily, V.; Horton, A.; Beaumont, P.; Ellis, R.; Cecil, F. E.; Podesta, M.

doi:10.1063/5.0014278

Title: Improvements to the Faraday cup fast ion loss detector and magnetohydrodynamic induced fast ion loss measurements in Joint European Torus plasmas

Journal Article · Tue Sep 01 00:00:00 EDT 2020 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0014278· OSTI ID:1660494

^[1]; Kiptily, V. ^[2]; Horton, A. ^[2]; Beaumont, P. ^[2]; Ellis, R. ^[1]; Cecil, F. E. ^[3]; Podesta, M. ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association
Colorado School of Mines, Golden, CO (United States)

Upgrades to electronic hardware and detector design have been made to the JET thin-foil Faraday cup fast ion loss detector in anticipation of the upcoming deuterium–tritium (DT) campaign. An improved foil stack design has been implemented, which greatly reduces the number of foil-to-foil shorts, and triaxial cabling has mitigated ambient noise pickup. Initial tests of 200 kHz digitizers, as opposed to the original 5 kHz digitizers, have provided enhanced analysis techniques and direct coherence measurements of fast ion losses with magnetohydrodynamic activity. Here, we present recent loss measurements in JET deuterium plasmas correlated with kink modes, fishbone modes, edge-localized modes, and sawteeth. Sources of systematic noise are discussed with emphasis on capacitive plasma pickup. Overall, the system upgrades have established a diagnostic capable of recording alpha particle losses due to a wide variety of resonant fast ion transport mechanisms to be used in future DT-experiments and modeling efforts.

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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); EUROfusion Consortium

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC02-09CH11466; 633053

OSTI ID:: 1660494

Alternate ID(s):: OSTI ID: 1657265

Journal Information:: Review of Scientific Instruments, Vol. 91, Issue 9; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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