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Fast ion synergistic effects in JET high performance pulses
Culham Sci Ctr, CCFE Fus Assoc, Abingdon, Oxon, England.
Culham Sci Ctr, CCFE Fus Assoc, Abingdon, Oxon, England.
Univ Lisbon, Inst Plasmas & Fusao Nucl, Inst Super Tecn, P-1049001 Lisbon, Portugal.
Culham Sci Ctr, CCFE Fus Assoc, Abingdon, Oxon, England.
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2019 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 59, no 5, article id 056005Article in journal (Refereed) Published
Abstract [en]

Fast ion synergistic effects were studied by predictive modelling of JET best performing pulses for various levels of neutral beam injection (NBI) and radio frequency (RF) power. Calculated DD neutron yields were analysed with the intention of separating the impact of RF synergistic effects due to changes in fast ion (FT) distribution function (DF) from secondary effects accompanying the application of RF power, namely changes in T-e and T-i . A novel approach in analysing the efficiency of fast ions in fusion reactions based on evaluation of the cumulative reaction rates is outlined and used in the study. Conclusions on the impact of fast ion synergistic effects on fusion performance are based on comparisons of beam-target (BT) and thermal (Th) DD reaction rates. It was found that changes in auxiliary heating power, NBI and RF, by 4 MW will affect DD fusion performance and neutron rates significantly. Simulations of the best performing JET pulses show that for H minority RF heating scheme with available RF power the impact of RF synergistic effects is somewhat lesser than the secondary effects related to changes in T-e and T-i . In conditions of much higher RF power the modification in fast ion distribution function (FI DF) and the impact of the fast ions on BT DD fusion becomes significant. The impact of the RF and NBI power on the BT reactivities was found to be of similar order; however, the NAT power has greater impact on reaction rates due to its larger effect on fast ion density.

Place, publisher, year, edition, pages
2019. Vol. 59, no 5, article id 056005
Keywords [en]
NBI/ICRH synergy, fast ion distribution function, predictive modelling, JET
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-382246DOI: 10.1088/1741-4326/ab02aeISI: 000462112700002OAI: oai:DiVA.org:uu-382246DiVA, id: diva2:1313563
Available from: 2019-05-03 Created: 2019-05-03 Last updated: 2019-05-03Bibliographically approved

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Eriksson, Jacob

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