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  • 1. Tardocchi, M.
    et al.
    Gorini, G.
    Andersson Sundén, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Conroy, Sean W.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Ericsson, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Gatu Johnson, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Giacomelli, Luca
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Hellesen, Carl
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Källne, Jan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Ronchi, Emanuel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Sjöstrand, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Weiszflog, Matthias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Johnson, Tomas
    Uppsala University, The Svedberg Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Lamalle, P.U.
    Modeling of neutron emission spectroscopy in JET discharges with fast tritons from (T)D ion cyclotron heating2006In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 77, no 12, p. 126107-Article in journal (Refereed)
    Abstract [en]

    The measurement of fast ion populations is one of the diagnostic capabilities provided by neutron emission spectroscopy (NES). NES measurements were carried out during JET trace tritium campaign with the magnetic proton recoil neutron spectrometer. A favorable plasma scenario is (T)D where the resulting 14 MeV neutron yield is dominated by suprathermal emission from energetic tritons accelerated by radio frequency at their fundamental cyclotron frequency. Information on the triton distribution function has been derived from NES data with a simple model based on two components referred to as bulk (B) and high energy (HE). The HE component is based on strongly anisotropic tritium distribution that can be used for routine best-fit analysis to provide tail temperature values (THE). This article addresses to what extent the THE values are model dependent by comparing the model above with a two-temperature (bi-) Maxwellian model featuring parallel and perpendicular temperatures. The bi-Maxwellian model is strongly anisotropic and frequently used for radio frequency theory.

  • 2. Tardocchi, M
    et al.
    Gorini, G
    Johnson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Sundén, Erik Andersson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Conroy, Sean
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Ericsson, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Gatu Johnson, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Giacomelli, Luca
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Hellesen, Carl
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Källne, Jan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Ronchi, Emanuel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Sjöstrand, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Weiszflog, Matthias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
    Lamalle, P.U
    Modeling of Neutron Emission Spectroscopy in JET Discharges with Fast Tritons from (T)D Ion Cyclotron Heating2006Report (Other (popular science, discussion, etc.))
  • 3.
    Versloot, T W
    et al.
    FOM Institute Rijnhuizen, Association EURATOM-FOM, Nieuwegein, Nederländerna.
    Sartori, R
    Fusion for Energy Joint Undertaking, Barcelona, Spanien.
    Rimini, F
    JET-EFDA Close Support Unit, Culham Science Centre, Abingdon, UK.
    de Vries, P C
    FOM Institute Rijnhuizen, Association EURATOM-FOM, Nieuwegein, Nederländerna.
    Saibene, G
    Fusion for Energy Joint Undertaking, Barcelona, Spanien.
    Parail, V
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Beurskens, M N A
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Boboc, A
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Budny, R
    Princeton Plasma Physics Laboratory, Princeton, NJ, USA.
    Crombe, K
    Dept of Applied Physics, Ghent University, Belgien.
    de la Luna, E
    Laboratorio nacional De Fusion, Associacion EURATOM-CIEMAT, Madrid, Spanien.
    Durodie, F
    Association Euratom-Belgian State, ERM/KMS, TEC Partners, Brussels, Belgien.
    Eich, T
    Max-Planck-Institute für Plasmaphysik, Garching, Tyskland.
    Giroud, C
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Kiptily, V
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Johnson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Mantica, P
    FOM Institute Rijnhuizen, Association EURATOM-FOM, Nieuwegein, Nederländerna.
    Mayoral, M -L
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    McDonald, D C
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Monakhov, I
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Nave, M F F
    Associacao EURATOM-IST, Instituto de Plasmas i Fusao Nuclear, Lissabon, Portugal.
    Voitsekhovitch, I
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Zastrow, K-D
    EURATOM/CCFE Association, Culham Science Centre, Abingdon, UK.
    Comparison between dominant NB and dominant IC heated ELMy H-mode discharges in JET2011In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 51, no 10, p. 103033-Article in journal (Refereed)
    Abstract [en]

    The experiment described in this paper is aimed at characterization of ELMy H-mode discharges with varying momentum input, rotation, power deposition profiles and ion to electron heating ratio obtained by varying the proportion between ion cyclotron (IC) and neutral beam (NB) heating. The motivation for the experiment was to verify if the basic confinement and transport properties of the baseline ITER H-mode are robust to these changes, and similar to those derived mostly from dominant NB heated H-modes. No significant difference in the density and temperature profiles or in the global confinement were found. Although ion temperature profiles were seen to be globally stiff, some variation of stiffness was obtained in the experiment by varying the deposition profiles, but not one that could significantly affect the profiles in terms of global confinement. This analysis shows the thermal plasma energy confinement enhancement factor to be independent of the heating mix, for the range of conditions explored. Moreover, the response of the global confinement to changes in density and power were also independent of heating mix, reflecting the changes in the pedestal, which is in agreement with globally stiff profiles. Consistently, the pedestal characteristics (pressure and width) and their dependences on global parameters such as density and power were the same during NB only or with predominant IC heating.

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