Isotope effects and Alfvén eigenmode stability in JET H, D, T, DT, and He plasmas

Tinguely, R. A.; Puglia, P. G.; Dowson, S.; Porkolab, M.; Douai, D.; Fasoli, A.; Frassinetti, L.; King, D.; Schneider, P.

doi:10.1088/1741-4326/ad6013

Isotope effects and Alfvén eigenmode stability in JET H, D, T, DT, and He plasmas

Journal Article · Thu Jul 18 00:00:00 EDT 2024 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ad6013· OSTI ID:2404448

^[1]; ^[2]; Dowson, S. ^[3]; Porkolab, M. ^[1]; Douai, D. ^[2]; ^[4]; ^[5]; King, D. ^[3]; ^[6]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
CEA, IRFM, Saint Paul Lez Durance (France)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
KTH Royal Inst. of Technology, Stockholm (Sweden)
Max Planck Institute for Plasma Physics, Garching (Germany)

While much about Alfvén eigenmode (AE) stability has been explored in previous and current tokamaks, open questions remain for future burning plasma experiments, especially regarding exact stability threshold conditions and related isotope effects; the latter, of course, requiring good knowledge of the plasma ion composition. In the JET tokamak, eight in-vessel antennas actively excite stable AEs, from which their frequencies, toroidal mode numbers, and net damping rates are assessed. The effective ion mass can also be inferred using measurements of the plasma density and magnetic geometry. Thousands of AE stability measurements have been collected by the Alfvén Eigenmode Active Diagnostic in hundreds of JET plasmas during the recent Hydrogen, Deuterium, Tritium, DT, and Helium-4 campaigns. In this novel AE stability database, spanning all four main ion species, damping is observed to decrease with increasing Hydrogenic mass, but increase for Helium, a trend consistent with radiative damping as the dominant damping mechanism. These data are important for confident predictions of AE stability in both non-nuclear (H/He) and nuclear (D/T) operations in future devices. In particular, if radiative damping plays a significant role in overall stability, some AEs could be more easily destabilized in D/T plasmas than their H/He reference pulses, even before considering fast ion and alpha particle drive. Active MHD spectroscopy is also employed on select HD, HT, and DT plasmas to infer the effective ion mass, thereby closing the loop on isotope analysis and demonstrating a complementary method to typical diagnosis of the isotope ratio.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Princeton Univ., NJ (United States); Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: EUROfusion; Fundação de Amparo à Pesquisa do Estado de São Paulo; Scientific Education and Research Institute; USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-05CH11231; AC02-09CH11466; SC0014264; SC0020337; SC0020412

Other Award/Contract Number:: FESERCAP20598
101052200
2011/50773-0

OSTI ID:: 2404448

Alternate ID(s):: OSTI ID: 2396014
OSTI ID: 2578827
OSTI ID: 3027603

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 64; ISSN 1741-4326; ISSN 0029-5515

Publisher:: IOP Science - IAEACopyright Statement

Country of Publication:: United States

Language:: English

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Alfvén eigenmodes
active MHD spectroscopy
deuterium-tritium plasma
isotope effects
isotope ratio
stability

Isotope effects and Alfvén eigenmode stability in JET H, D, T, DT, and He plasmas

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