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

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/5.0099314· OSTI ID:1895040
 [1];  [2];  [3];  [4];  [1];  [5];  [2];  [6];  [6];  [7];  [8];  [9];  [2];  [2];  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. UKAEA Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
  3. Kyiv Institute for Nuclear Research (Ukraine)
  4. UKAEA Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
  5. Colorado School of Mines, Golden, CO (United States)
  6. Max-Planck-Institut für Plasmaphysik, Garching (Germany)
  7. UKAEA Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); LPP-ERM-KMS, Association EUROFUSION-Belgian State, Brussels (Belgium)
  8. Univ. of Lisbon (Portugal)
  9. CEA, IRFM, Saint Paul Lez Durance (France)
+ Show Author Affiliations
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.
Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
EUROfusion Consortium (European Union); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Contributing Organization:
JET Contributors
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
1895040
Alternate ID(s):
OSTI ID: 1890256
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 93; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (7)

FIG. 1(p. 3)figure FIG. 1
FIG. 2(p. 3)figure FIG. 2
FIG. 3(p. 4)figure FIG. 3
FIG. 4(p. 4)figure FIG. 4
FIG. 5(p. 5)figure FIG. 5
FIG. 6(p. 5)figure FIG. 6
FIG. 7(p. 6)figure FIG. 7

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY