Fast-ion orbit origin of neutron emission spectroscopy measurements in the JET DT campaign

Järleblad, H.Tech Univ Denmark, Dept Appl Math & Comp Sci, DK-2800 Lyngby, Denmark. (author)

In the JET DTE2 deuterium-tritium campaign, neutron diagnostics were employed to measure 14 MeV neutrons originating from D(T,n)4He reactions. In discharge 99965, a diamond matrix detector (KM14) and a magnetic proton recoil (MPRu) detector with a vertical and an oblique line-of-sight were used, respectively. At the timepoints of interest, a significant decrease in the expected diagnostic signals can be observed as electromagnetic wave heating in the ion cyclotron range of frequencies (ICRF) is switched off. Utilizing only TRANSP simulation data, the fast-ion distribution is found to have been likely composed mostly of trapped orbits. In contrast, analysis performed using orbit weight functions revealed that the majority of neutrons in the KM14 MeV and MPRu cm measurement bins are to have originated from fast deuterium ions on co-passing orbits. This work explains the perhaps surprising results and shows that the relative signal decrease as ICRF heating is switched off is largest for counter-passing orbits. Finally, for the magnetic equilibria of interest, it is shown how stagnation orbits, corresponding to % of the fast-ion distribution, were completely unobservable by the KM14 diagnostic.

Stagner, L.Gen Atom, POB 85608, San Diego, CA 92186 USA. (author)
Eriksson, Jacob,Dr,1985-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)jacer352 (author)
Nocente, M.Univ Milano Bicocca, Dept Phys, I-20126 Milan, Italy. (author)
Kirov, K.Culham Ctr Fus Energy, UKAEA, Abingdon OX14 3DB, Oxon, England. (author)
Rud, M.Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark. (author)
Schmidt, B. S.Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark. (author)
Maslov, M.Culham Ctr Fus Energy, UKAEA, Abingdon OX14 3DB, Oxon, England. (author)
King, D.Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England. (author)
Keeling, D.Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England. (author)
Maggi, C.Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England. (author)
Garcia, J.CEA, IRFM, F-13108 St Paul Lez-Durance, France. (author)
Lerche, E. A.Ecole Royale Mil, Koninklijke Mil Sch Belg Staat, Lab Plasmafys, B-1000 Brussels, Belgium. (author)
Mantica, P.Ist Sci & Tecnol Plasmi, CNR, Via Cozzi 53, I-20125 Milan, Italy. (author)
Dong, Y.Tech Univ Denmark, Dept Appl Math & Comp Sci, DK-2800 Lyngby, Denmark. (author)
Salewski, M.Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark. (author)
Tech Univ Denmark, Dept Appl Math & Comp Sci, DK-2800 Lyngby, Denmark.Gen Atom, POB 85608, San Diego, CA 92186 USA. (creator_code:org_t)

By the author/editor: Järleblad, H.; Stagner, L.; Eriksson, Jacob, ...; Nocente, M.; Kirov, K.; Rud, M.; show more...; Schmidt, B. S.; Maslov, M.; King, D.; Keeling, D.; Maggi, C.; Garcia, J.; Lerche, E. A.; Mantica, P.; Dong, Y.; Salewski, M.; show less...

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