{"id":9353,"date":"2022-06-06T16:05:58","date_gmt":"2022-06-06T16:05:58","guid":{"rendered":"https:\/\/www.istp.cnr.it\/?post_type=product&#038;p=9353"},"modified":"2023-02-03T10:42:09","modified_gmt":"2023-02-03T10:42:09","slug":"excitation-of-alfven-eigenmodes-by-fusion-born-alpha-particles-in-d-3he-plasmas-on-jet","status":"publish","type":"product","link":"https:\/\/www.istp.cnr.it\/it\/research-product\/excitation-of-alfven-eigenmodes-by-fusion-born-alpha-particles-in-d-3he-plasmas-on-jet\/","title":{"rendered":"Excitation of Alfv\u00e9n eigenmodes by fusion-born alpha-particles in D-3He plasmas on JET"},"content":{"rendered":"<p>Alfv\u00e9n eigenmode (AE) instabilities driven by alpha-particles have been observed in D-3He fusion experiments on the Joint European Torus (JET) with the ITER-like wall. For the efficient generation of fusion alpha-particles from D-3He fusion reaction, the three-ion radio frequency scenario was used to accelerate the neutral beam injection 100 keV deuterons to higher energies in the core of mixed D-3He plasmas at high concentrations of 3He. A large variety of fast-ion driven magnetohydrodynamic modes were observed, including the elliptical Alfv\u00e9n eigenmodes (EAEs) with mode numbers n = -1 and axisymmetric modes with n = 0 in the frequency range of EAEs. The simultaneous observation of these modes indicates the presence of rather strong alpha-particle population in the plasma with a &#8216;bump-on-tail&#8217; shaped velocity distribution. Linear stability analysis and Fokker-Planck calculations support the observations. Experimental evidence of the AEs excitation by fusion-born alpha-particles in the D-3He plasma is provided by neutron and gamma-ray diagnostics as well as fast-ion loss measurements. We discuss an experimental proposal for the planned full-scale D-T plasma experiments on JET based on the physics insights gained from these experiments.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kiptily V.G.; Kazakov Y.O.; Nocente M.; Ongena J.; Belli F.; Dreval M.; Craciunescu T.; Eriksson J.; Fitzgerald M.; Giacomelli L.; Goloborodko V.; Iliasova M.V.; Khilkevitch E.M.; Rigamonti D.; Sahlberg A.; Salewski M.; Shevelev A.E.; Garcia J.; Oliver H.J.C.; Sharapov S.E.; Stancar Z.; Weisen H.<\/p>\n","protected":false},"featured_media":1294,"comment_status":"closed","ping_status":"open","template":"","meta":[],"product_cat":[574],"product_tag":[1183,1184,3690,3691],"class_list":["post-9353","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-journal-articles","product_tag-fusion-born-alpha-particles","product_tag-mhd-instabilities","product_tag-okamak","product_tag-fast-ion-diagnostics","prodpage-style2"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product\/9353","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/comments?post=9353"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media\/1294"}],"wp:attachment":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media?parent=9353"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_cat?post=9353"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_tag?post=9353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}