Lost alpha Faraday cup foil noise characterization during Joint European Torus plasma post-processing analysis

Bonofiglo, P. J.; Kiptily, V.; Goloborodko, V.; Štancar, Ž.; Podestà, M.; Cecil, F. E.; Challis, C. D.; Hobirk, J.; Kappatou, A.; Lerche, E.; Carvalho, I. S.; Garcia, J.; Mailloux, J.; Maggi, C. F.; Meigs, A. G.

doi:10.1063/5.0099314

Title: Lost alpha Faraday cup foil noise characterization during Joint European Torus plasma post-processing analysis

Journal Article · Thu Sep 29 00:00:00 EDT 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0099314· OSTI ID:1895040

^[1];

^[2]; Goloborodko, V. ^[3]; Štancar, Ž. ^[4];

^[1]; Cecil, F. E. ^[5]; Challis, C. D. ^[2];

^[6]; Kappatou, A. ^[6]; Lerche, E. ^[7];

^[8];

^[9]; Mailloux, J. ^[2]; Maggi, C. F. ^[2]; Meigs, A. G. ^[2]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
UKAEA Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Kyiv Institute for Nuclear Research (Ukraine)
UKAEA Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
Colorado School of Mines, Golden, CO (United States)
Max-Planck-Institut für Plasmaphysik, Garching (Germany)
UKAEA Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); LPP-ERM-KMS, Association EUROFUSION-Belgian State, Brussels (Belgium)
Univ. of Lisbon (Portugal)
CEA, IRFM, Saint Paul Lez Durance (France)

Capacitive plasma pickup is a well-known and difficult problem for plasma-facing edge diagnostics. This problem must be addressed to ensure an accurate and robust interpretation of the real signal measurements vs noise. The Faraday cup fast ion loss detector array of the Joint European Torus (JET) is particularly prone to this issue and can be used as a testbed to prototype solutions. The issue of separation and distinction between warranted fast ion signal and electromagnetic plasma noise has traditionally been solved with hardware modifications, but a more versatile post-processing approach is of great interest. This work presents post-processing techniques to characterize the signal noise. While hardware changes and advancements may be limited, the combination with post-processing procedures allows for more rapid and robust analysis of measurements. The characterization of plasma pickup noise is examined for alpha losses in a discharge from JET’s tritium campaign. In addition to highlighting the post-processing methodology, the spatial sensitivity of the detector array is also examined, which presents significant advantages for the physical interpretation of fast ion losses.

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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 (European Union)

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC02-09CH11466; 101052200

OSTI ID:: 1895040

Alternate ID(s):: OSTI ID: 1890256

Journal Information:: Review of Scientific Instruments, Vol. 93, Issue 9; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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