Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session BI01: Magnetic Confinement Fusion I
9:30 AM–12:30 PM,
Monday, October 17, 2022
Room: Ballroom 100 A
Chair: Andrea Garofalo, General Atomics
Abstract: BI01.00004 : Fast ions as a tool for plasma control and enhanced performance on JET
11:00 AM–11:30 AM
Presenter:
Yevgen Kazakov
(Laboratory for Plasma Physics, LPP-ERM/KMS, Brussels, Belgium)
Authors:
Yevgen Kazakov
(Laboratory for Plasma Physics, LPP-ERM/KMS, Brussels, Belgium)
Jeronimo Garcia
(CEA, IRFM, Saint-Paul-Lez-Durance, France)
Samuele Mazzi
(Swiss Plasma Center, EPFL, Lausanne, Switzerland)
Jozef Ongena
(Laboratory for Plasma Physics, LPP-ERM/KMS, Brussels, Belgium)
Mykola Dreval
(National Science Center, Kharkiv Institute of Physics and Technology, Kharkiv, Ukraine)
Vasili Kiptily
(UKAEA, CCFE, Culham Science Centre, Abingdon, UK)
Massimo Nocente
(Dipartimento di Fisica, Università di Milano-Bicocca, Milan, Italy)
Sergei Sharapov
(UKAEA, CCFE, Culham Science Centre, Abingdon, UK)
Ziga Stancar
(UKAEA, CCFE, Culham Science Centre, Abingdon, UK)
Teddy Craciunescu
(National Institute for Laser, Plasma and Radiation Physics, Bucharest, Romania)
Jacob Eriksson
(Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden)
Michael Fitzgerald
(UKAEA, CCFE, Culham Science Centre, Abingdon, UK)
Arne Sahlberg
(Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden)
Mirko Salewski
(Tech Univ of Denmark)
Gabor Szepesi
(UKAEA, CCFE, Culham Science Centre, Abingdon, UK)
Henri Weisen
(Swiss Plasma Center, EPFL, Lausanne, Switzerland)
David Zarzoso
(Aix-Marseille University, CNRS, PIIM, Marseille, France)
Sadruddin Benkadda
(Aix-Marseille University, CNRS, PIIM, Marseille, France)
. JET Contributors
(See the author list of J. Mailloux et al., Nucl. Fusion 62, 042026 (2022))
Collaboration:
JET Contributors
We discuss recent findings from a series of dedicated experiments at JET, aiming to generate a large population of MeV-range ions and maximize the fast-ion pressure in the plasma core [3]. A number of new fast-ion physics phenomena have been revealed in these studies. First, we report on unexpectedly high Ti and improved thermal ion confinement in JET plasmas with electron heating from MeV ions [4, 5]. Second, we discuss a novel technique for fast-ion current drive, leading to sustained plasmas with an inverted q-profile and a unique observation of high frequency reversed-shear AEs at JET [6]. These modes, earlier observed in JT-60U plasmas heated with N-NBI, are highly relevant for ITER, but have been scarcely documented so far. We also discuss progress on synergistic effects that arise from the simultaneous occurrence of different fast-ion phenomena. In particular, we report on novel measurements and characterization of AEs with toroidal mode numbers n<0 and n=0, observed in D-3He plasmas with fusion-born alpha particles [7]. A new mechanism leading to the generation of a fast-ion population with a bump-on-tail ∂f/∂E<0 in the presence of monster sawteeth was identified recently [8].
These findings formed a basis for the follow-up fast-ion studies in the recent DTE2 campaign. We conclude with discussing the impact of AEs driven by ICRF-generated fast ions on the performance of D-T plasmas at JET and present evidence of non-linear mode coupling in these plasmas.
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