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Kiptily VG, Dumont R, Fitzgerald M, Keeling D, Sharapov SE, Poradzinski M, Štancar Ž, Bonofiglo PJ, Delabie E, Ghani Z, Goloborodko V, Menmuir S, Kowalska-Strzeciwilk E, Podestà M, Sun H, Taylor DM, Bernardo J, Carvalho IS, Douai D, Garcia J, Lennholm M, Maggi CF, Mailloux J, Rimini F, Siren P. Evidence of Electron Heating by Alpha Particles in JET Deuterium-Tritium Plasmas. Phys Rev Lett 2023; 131:075101. [PMID: 37656860 DOI: 10.1103/physrevlett.131.075101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 05/03/2023] [Accepted: 06/16/2023] [Indexed: 09/03/2023]
Abstract
The fusion-born alpha particle heating in magnetically confined fusion machines is a high priority subject for studies. The self-heating of thermonuclear fusion plasma by alpha particles was observed in recent deuterium-tritium (D-T) experiments on the joint European torus. This observation was possible by conducting so-called "afterglow" experiments where transient high fusion yield was achieved with neutral beam injection as the only external heating source, and then termination of the heating at peak performance. This allowed the first direct evidence for electron heating of plasmas by fusion-born alphas to be obtained. Interpretive transport modeling of the relevant D-T and reference deuterium discharges is consistent with the alpha particle heating observation.
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Affiliation(s)
- V G Kiptily
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - R Dumont
- CEA - IRFM, 13115 Saint-Paul-lez-Durance, France
| | - M Fitzgerald
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - D Keeling
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - S E Sharapov
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - M Poradzinski
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - Ž Štancar
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
- Joźef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - P J Bonofiglo
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - E Delabie
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Z Ghani
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - V Goloborodko
- Kyiv Institute for Nuclear Research, 03680 Kyiv, Ukraine
| | - S Menmuir
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | | | - M Podestà
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - H Sun
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - D M Taylor
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - J Bernardo
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - I S Carvalho
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - D Douai
- CEA - IRFM, 13115 Saint-Paul-lez-Durance, France
| | - J Garcia
- CEA - IRFM, 13115 Saint-Paul-lez-Durance, France
| | - M Lennholm
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - C F Maggi
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - J Mailloux
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - F Rimini
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
| | - P Siren
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom
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Bonofiglo PJ, Kiptily V, Goloborodko V, Štancar Ž, Podestà M, Cecil FE, Challis CD, Hobirk J, Kappatou A, Lerche E, Carvalho IS, Garcia J, Mailloux J, Maggi CF, Meigs AG. Lost alpha Faraday cup foil noise characterization during Joint European Torus plasma post-processing analysis. Rev Sci Instrum 2022; 93:093527. [PMID: 36182470 DOI: 10.1063/5.0099314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 08/18/2022] [Indexed: 06/16/2023]
Abstract
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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Affiliation(s)
- P J Bonofiglo
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - V Kiptily
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - V Goloborodko
- Kyiv Institute for Nuclear Research, Prospekt Nauky 47, Kyiv 03680, Ukraine
| | - Ž Štancar
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - M Podestà
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - F E Cecil
- Colorado School of Mines, Golden, Colorado 80401, USA
| | - C D Challis
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - J Hobirk
- Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany
| | - A Kappatou
- Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany
| | - E Lerche
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - I S Carvalho
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal
| | - J Garcia
- CEA-IRFM, F-13108 Saint Paul Lez Durance, France
| | - J Mailloux
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - C F Maggi
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - A G Meigs
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
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Rivero-Rodriguez JF, Perez Von Thun C, Garcia-Muñoz M, Beaumont P, Kiptily V, Garcia-Lopez J, Goloborodko V, Jimenez-Ramos MC, Rodriguez-Ramos M, Schoepf K, Yavorskij V. Upgrade and absolute calibration of the JET scintillator-based fast-ion loss detector. Rev Sci Instrum 2021; 92:043553. [PMID: 34243489 DOI: 10.1063/5.0043760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 04/01/2021] [Indexed: 06/13/2023]
Abstract
The JET FILD is a scintillator-based Fast-ion Loss Detector optimized to measure fusion-born alpha-particle losses. This work covers its upgrade and absolute calibration in preparation for the following JET DT experiments. A fast scintillator material (TG-Green) has been installed in the JET FILD. A heater jacket is installed around the fiber bundle, responsible for transmitting the light from the scintillator plate, to anneal the fiber obscuring due to neutron damage. The JET FILD has been upgraded with a 1 Mpx camera and 2 MHz photomultiplier data acquisition hardware. Full-orbit simulations give an estimate of the shading effects on the scintillator plate of the first wall structures and provide a synthetic signal of the JET FILD. A detector instrument function enables absolute values of fast-ion losses using calibration factors. The calibration factors are made available in a shot-to-shot basis for the characterized species and energies and with corrections for the diagnostic conditions. The fast acquisition system sets the Nyquist frequency (1 MHz) above the typical mode frequencies (≈102 kHz), thus making it possible to identify MHD-induced fast-ion losses.
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Affiliation(s)
- J F Rivero-Rodriguez
- Departamento de Ingenieria Mecanica y Fabricacion, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain
| | - C Perez Von Thun
- Institute of Plasma Physics and Laser Microfusion, Hery 23, 01-497 Warsaw, Poland
| | - M Garcia-Muñoz
- Centro Nacional de Aceleradores (CNA) (Universidad de Sevilla, CSIC, Junta de Andalucia), Seville, Spain
| | - P Beaumont
- CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - V Kiptily
- CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - J Garcia-Lopez
- Centro Nacional de Aceleradores (CNA) (Universidad de Sevilla, CSIC, Junta de Andalucia), Seville, Spain
| | - V Goloborodko
- OEAW, Institute for Theoretical Physics, University of Innsbruck, Innsbruck, Austria
| | - M C Jimenez-Ramos
- Centro Nacional de Aceleradores (CNA) (Universidad de Sevilla, CSIC, Junta de Andalucia), Seville, Spain
| | - M Rodriguez-Ramos
- Laboratory for Ion beam Interactions, Ruder Boskovic Institute, Zagreb, Croatia
| | - K Schoepf
- OEAW, Institute for Theoretical Physics, University of Innsbruck, Innsbruck, Austria
| | - V Yavorskij
- OEAW, Institute for Theoretical Physics, University of Innsbruck, Innsbruck, Austria
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Ongena J, Kazakov Y, Baranov Y, Hellesen C, Eriksson J, Johnson T, Kiptily V, Mantsinen M, Nocente M, Bilato R, Cardinali A, Castaldo C, Crombé K, Czarnecka A, Dumont R, Faustin J, Giacomelli L, Goloborodko V, Graves J, Jacquet P, Krawczyk N, Lerche E, Meneses L, Nave M, Patten H, Schneider M, Van Eester D, Weisen H, Wright J. Synergetic heating of D-NBI ions in the vicinity of the mode conversion layer in H-D plasmas in JET with the ITER like wall. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201715702006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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