Assessing the impact of alpha particles on thermal confinement in JET D-T plasmas through global GENE-Tango simulations

被引：0

作者：

Di Siena, A. ^{[1
]}

Garcia, J. ^{[2
]}

Bilato, R. ^{[1
]}

Kirov, K. ^{[3
]}

Varela, J. ^{[4
]}

Banon Navarro, A. ^{[1
]}

Kim, Hyun-Tae ^{[3
]}

Challis, C. ^{[3
]}

Hobirk, J. ^{[1
]}

Kappatou, A. ^{[1
]}

Lerche, E. ^{[3
]}

Spong, D. ^{[5
]}

Angioni, C. ^{[1
]}

Poli, E. ^{[1
]}

Goerler, T. ^{[1
]}

Bergmann, M. ^{[1
]}

Jenko, F. ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Greifswald, Germany

[2] CEA, IRFM, F-13108 St Paul Les Durance, France

[3] United Kingdom Atom Energy Author, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[4] Univ Texas Austin, Austin, TX 78712 USA

[5] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

NUCLEAR FUSION | 2025年 / 65卷 / 01期

基金：

欧盟地平线“2020”;

关键词：

gyrokinetics; energetic particles; turbulence; TURBULENCE; TRANSPORT;

D O I：

10.1088/1741-4326/ad9489

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The capability of the global, electromagnetic gyrokinetic GENE code interfaced with the transport Tango solver is exploited to address the impact of fusion alpha particles (in their dual role of fast particles and heating source) on plasma profiles and performance at JET in the discharges with the highest quasi-stationary peak fusion power during the DTE2 experimental campaigns. Employing radially global nonlinear electromagnetic GENE-Tango simulations, we compare results with/without alpha particles and alpha heating. Our findings reveal that alpha particles have a negligible impact on turbulent transport, with GENE-Tango converging to similar plasma profiles regardless of their inclusion as a kinetic species in GENE. On the other hand, alpha heating is found to contribute to the peaking of the electron temperature profiles, leading to a 1 keV drop on the on-axis electron temperature when alpha heating is neglected in Tango. The minimal impact of alpha particles on turbulent transport in this JET discharge-despite this being the shot with the highest fusion output-is attributed to the low content of fusion alpha in this discharge. To assess the potential impact of alpha particles on turbulent transport in regimes with higher alpha particle density, as expected in ITER and fusion reactors, we artificially increased the alpha particle concentration to levels expected for ITER. By performing global nonlinear GENE standalone simulations, we found that increasing the alpha particle density beyond five times the nominal value lead to significant overall turbulence destabilization. These results demonstrate that an increased alpha particle concentration can significantly impact transport properties under simulated JET experimental conditions. However, these findings cannot be directly extrapolated to ITER due to the substantial differences in parameters such as plasma size, magnetic field, plasma current, and thermal pressure.

引用

页数：15

共 73 条

[1] First-principles based plasma profile predictions for optimized stellarators [J].

Banon Navarro, A. ;

Di Siena, A. ;

Velasco, J. L. ;

Wilms, F. ;

Merlo, G. ;

Windisch, T. ;

LoDestro, L. L. ;

Parker, J. B. ;

Jenko, F. .

NUCLEAR FUSION, 2023, 63 (05)

[2] Direct multiscale coupling of a transport code to gyrokinetic turbulence codes [J].

Barnes, M. ;

Abel, I. G. ;

Dorland, W. ;

Goerler, T. ;

Hammett, G. W. ;

Jenko, F. .

PHYSICS OF PLASMAS, 2010, 17 (05)

[3] Gyrokinetic simulations of mesoscale energetic particle-driven Alfvenic turbulent transport embedded in microturbulence [J].

Bass, E. M. ;

Waltz, R. E. .

PHYSICS OF PLASMAS, 2010, 17 (11)

[4] Density impact on toroidal rotation in Tore Supra: experimental observations and theoretical investigation [J].

Bernardo, J. ;

Fenzi, C. ;

Bourdelle, C. ;

Camenen, Y. ;

Arnichand, H. ;

Bizarro, Joao P. S. ;

Cortes, S. ;

Garbet, X. ;

Guimaraes-Filho, Z. O. ;

Aniel, T. ;

Artaud, J-F ;

Clairet, F. ;

Cottier, P. ;

Gunn, J. ;

Lotte, P. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2015, 57 (03)

[5] Gyrokinetic investigation of Alfven instabilities in the presence of turbulence [J].

Biancalani, A. ;

Bottino, A. ;

Di Siena, A. ;

Gurcan, O. ;

Hayward-Schneider, T. ;

Jenko, F. ;

Lauber, P. ;

Mishchenko, A. ;

Morel, P. ;

Novikau, I ;

Vannini, F. ;

Villard, L. ;

Zocco, A. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2021, 63 (06)

[6] On the approximations of the distribution function of fusion alpha particles [J].

Bilato, R. ;

Brambilla, M. ;

Poli, E. .

PHYSICS OF PLASMAS, 2014, 21 (10)

[7] A new gyrokinetic quasilinear transport model applied to particle transport in tokamak plasmas [J].

Bourdelle, C. ;

Garbet, X. ;

Imbeaux, F. ;

Casati, A. ;

Dubuit, N. ;

Guirlet, R. ;

Parisot, T. .

PHYSICS OF PLASMAS, 2007, 14 (11)

[8] Anomalous transport scaling in the DIII-D tokamak matched by supercomputer simulation [J].

Candy, J ;

Waltz, RE .

PHYSICAL REVIEW LETTERS, 2003, 91 (04)

[9] Physics of Alfven waves and energetic particles in burning plasmas [J].

Chen, Liu ;

Zonca, Fulvio .

REVIEWS OF MODERN PHYSICS, 2016, 88 (01)

[10] Overview of tokamak turbulence stabilization by fast ions [J].

Citrin, J. ;

Mantica, P. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2023, 65 (03)

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