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Detection of alpha heating in JET-ILW DT plasmas by a study of the electron temperature response to ICRH modulation

Authors :
P. Mantica
F. Auriemma
I. Casiraghi
D. Gallart
K. Kirov
E. Lerche
A. Salmi
A. Dal Molin
E. Delabie
J. Eriksson
J. Garcia
P. Huynh
P. Jacquet
T. Jonsson
V. Kiptily
E. Litherland–Smith
C.F. Maggi
M. Mantsinen
G. Marcer
M. Maslov
S. Menmuir
M. Nocente
E. Peluso
G. Pucella
D. Rigamonti
Z. Stancar
H. Sun
G. Szepesi
M. Tardocchi
D. Van Eester
JET Contributors
Source :
Nuclear Fusion, Vol 64, Iss 8, p 086001 (2024)
Publication Year :
2024
Publisher :
IOP Publishing, 2024.

Abstract

In the JET DTE2 campaign a new method was successfully tested to detect the heating of bulk electrons by α-particles, using the dynamic response of the electron temperature T _e to the modulation of ion cyclotron resonance heating (ICRH). A fundamental deuterium (D) ICRH scheme was applied to a tritium-rich hybrid plasma with D-neutral beam injection (NBI). The modulation of the ion temperature T _i and of the ICRH accelerated deuterons leads to modulated α -heating with a large delay with respect to other modulated electron heating terms. A significant phase delay of ∼40° is measured between central T _e and T _i , which can only be explained by α -particle heating. Integrated modelling using different models for ICRH absorption and ICRH/NBI interaction reproduces the effect qualitatively. Best agreement with experiment is obtained with the European Transport Solver/Heating and Current Drive workflow.

Details

Language :
English
ISSN :
17414326 and 00295515
Volume :
64
Issue :
8
Database :
Directory of Open Access Journals
Journal :
Nuclear Fusion
Publication Type :
Academic Journal
Accession number :
edsdoj.85219e47e73843088cbc6ec36e05bba3
Document Type :
article
Full Text :
https://doi.org/10.1088/1741-4326/ad52aa