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

被引:2
作者
Tinguely, R. A. [1 ]
Puglia, P. G. [2 ]
Dowson, S. [3 ]
Porkolab, M. [1 ]
Douai, D. [2 ]
Fasoli, A. [4 ]
Frassinetti, L. [5 ]
King, D. [3 ]
Schneider, P. [6 ]
机构
[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA
[2] IRFM, CEA, St Paul Les Durance, France
[3] Culham Ctr Fus Energy, Culham Sci Ctr, Abingdon, England
[4] Ecole Polytech Fed Lausane EPFL, Swiss Plasma Ctr SPC, Lausanne, Switzerland
[5] KTH Royal Inst Technol, Stockholm, Sweden
[6] Max Planck Inst Plasma Phys, Greifswald, Germany
基金
巴西圣保罗研究基金会;
关键词
Alfv & eacute; n eigenmodes; stability; isotope effects; isotope ratio; deuterium-tritium plasma; active MHD spectroscopy; ALFVEN EIGENMODES; MHD SPECTROSCOPY; MODES; PARAMETERS;
D O I
10.1088/1741-4326/ad6013
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
While much about Alfv & eacute;n 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 Alfv & eacute;n 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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页数:8
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