{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T13:30:33Z","timestamp":1775050233994,"version":"3.50.1"},"reference-count":35,"publisher":"AIP Publishing","issue":"5","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2008,5,1]]},"abstract":"<jats:p>Core localized Alfv\u00e9n eigenmodes in DIII-D [J. L. Luxon, Nucl. Fusion\u200842, 614 (2002)] and Joint European Torus (JET) [P. H. Rebut and B. E. Keen, Fusion Technol.\u200811, 13 (1987)] plasmas are driven by deuterium neutral beam ions traveling well below the Alfv\u00e9n speed. Modes are observed in reverse magnetic shear discharges with deuterium ion velocities as low as 0.23 and 0.16 of the Alfv\u00e9n speed parallel to the magnetic field in DIII-D and JET plasmas, respectively. Ellipticity-induced Alfv\u00e9n eigenmodes in DIII-D and toroidicity-induced Alfv\u00e9n eigenmodes in JET are excited by deuterium ions traveling well below the fundamental passing ion resonance condition, indicating the role of high-order resonances in driving these modes. NOVA-K analysis reveals many high-order resonances as contributing to the mode drive at high central safety factor due to the correspondingly large poloidal orbit width and the decrease in the perpendicular scale length of the modes.<\/jats:p>","DOI":"10.1063\/1.2839286","type":"journal-article","created":{"date-parts":[[2008,2,27]],"date-time":"2008-02-27T23:32:53Z","timestamp":1204155173000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":34,"title":["Excitation of Alfv\u00e9n eigenmodes by low energy beam ions in the DIII-D and JET tokamaks"],"prefix":"10.1063","volume":"15","author":[{"given":"R.","family":"Nazikian","sequence":"first","affiliation":[{"name":"Princeton Plasma Physics Laboratory 1 , Princeton, New Jersey 08543, USA"}]},{"given":"N. 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