{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T23:43:33Z","timestamp":1775087013903,"version":"3.50.1"},"reference-count":26,"publisher":"IOP Publishing","issue":"11","license":[{"start":{"date-parts":[[2023,10,12]],"date-time":"2023-10-12T00:00:00Z","timestamp":1697068800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2023,10,12]],"date-time":"2023-10-12T00:00:00Z","timestamp":1697068800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Nucl. Fusion"],"published-print":{"date-parts":[[2023,11,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Dedicated experiments were performed in JET DTE2 plasmas for obtaining an <jats:italic>\u03b1<\/jats:italic>-particle bump-on-tail (BOT) distribution aiming at exciting Alfv\u00e9n eigenmodes (AEs). Neutral beam injection-only heating with modulated power was used so that fusion-born <jats:italic>\u03b1<\/jats:italic>-particles were the only ions present in the MeV energy range in these DT plasmas. The beam power modulation on a time scale shorter than the <jats:italic>\u03b1<\/jats:italic>-particle slowing down time was chosen for modulating the <jats:italic>\u03b1<\/jats:italic>-particle source and thus sustaining a BOT in the <jats:italic>\u03b1<\/jats:italic>-particle distribution. High-frequency modes in the toroidicity-induced Alfven eigenmode (TAE) frequency range and multiple short-lived modes in a wider frequency range have been detected in these DT discharges with interferometry, soft x-ray cameras, and reflectometry. The modes observed were localised close to the magnetic axis, and were not seen in the Mirnov coils. Analysis with the TRANSP and Fokker-Planck FIDIT codes confirms that <jats:italic>\u03b1<\/jats:italic>-particle distributions with BOT in energy were achieved during some time intervals in these discharges though no clear correlation was found between the times of the high-frequency mode excitation and the BOT time intervals. The combined magneto-hydrodynamic (MHD) and kinetic modelling studies show that the high-frequency mode in the TAE frequency range is best fitted with a TAE of toroidal mode number <jats:italic>n<\/jats:italic>= 9. This mode is driven mostly by the on-axis beam ions while the smaller drive due to the pressure gradient of <jats:italic>\u03b1<\/jats:italic>-particles allows overcoming the marginal stability and exciting the mode (Oliver <jats:italic>et al<\/jats:italic> 2023 <jats:italic>Nucl. Fusion<\/jats:italic> submitted). The observed multiple short-lived modes in a wider frequency range are identified as the on-axis kinetic AEs predicted in Rosenbluth and Rutherford (1975 <jats:italic>Phys. Rev. Lett.<\/jats:italic>\n                  <jats:bold>34<\/jats:bold> 1428).<\/jats:p>","DOI":"10.1088\/1741-4326\/acee10","type":"journal-article","created":{"date-parts":[[2023,10,12]],"date-time":"2023-10-12T09:35:17Z","timestamp":1697103317000},"page":"112007","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":19,"title":["Experiments on excitation of Alfv\u00e9n eigenmodes by alpha-particles with bump-on-tail distribution in JET DTE2 plasmas"],"prefix":"10.1088","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7006-4876","authenticated-orcid":true,"given":"S.E.","family":"Sharapov","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7302-085X","authenticated-orcid":true,"given":"H.J.C.","family":"Oliver","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0900-5564","authenticated-orcid":true,"given":"J.","family":"Garcia","sequence":"additional","affiliation":[]},{"given":"D.L.","family":"Keeling","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0482-0981","authenticated-orcid":true,"given":"M.","family":"Dreval","sequence":"additional","affiliation":[]},{"given":"V.","family":"Goloborod\u2019Ko","sequence":"additional","affiliation":[]},{"given":"Ye.O.","family":"Kazakov","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6191-7280","authenticated-orcid":true,"given":"V.G.","family":"Kiptily","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9608-280X","authenticated-orcid":true,"given":"\u017d.","family":"\u0160tancar","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5057-7383","authenticated-orcid":true,"given":"P.J.","family":"Bonofiglo","sequence":"additional","affiliation":[]},{"given":"R.","family":"Coelho","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0012-4260","authenticated-orcid":true,"given":"T.","family":"Craciunescu","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5015-7207","authenticated-orcid":true,"given":"J.","family":"Ferreira","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0487-8956","authenticated-orcid":true,"given":"A.","family":"Figueiredo","sequence":"additional","affiliation":[]},{"given":"N.","family":"Fil","sequence":"additional","affiliation":[]},{"given":"M.","family":"Fitzgerald","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4644-2827","authenticated-orcid":true,"given":"F.","family":"Nabais","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0170-5275","authenticated-orcid":true,"given":"M.","family":"Nocente","sequence":"additional","affiliation":[]},{"given":"P.G.","family":"Puglia","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5074-0267","authenticated-orcid":true,"given":"J.","family":"Rivero-Rodriguez","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6189-6865","authenticated-orcid":true,"given":"P.","family":"Rodrigues","sequence":"additional","affiliation":[]},{"given":"M.","family":"Salewski","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3711-1834","authenticated-orcid":true,"given":"R.A.","family":"Tinguely","sequence":"additional","affiliation":[]},{"given":"L.E.","family":"Zakharov","sequence":"additional","affiliation":[]},{"name":"JET Contributors","sequence":"additional","affiliation":[]}],"member":"266","published-online":{"date-parts":[[2023,10,12]]},"reference":[{"key":"nfacee10bib1","doi-asserted-by":"publisher","first-page":"1428","DOI":"10.1103\/PhysRevLett.34.1428","volume":"34","author":"Rosenbluth","year":"1975","journal-title":"Phys. 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