Approaching detachment in I-mode-response of core confinement and the edge pedestal in the ASDEX Upgrade tokamak

被引：7

作者：

Happel, T. ^{[1
]}

Reinke, M. L. ^{[2
]}

Silvagni, D. ^{[1
,3
]}

Bernert, M. ^{[1
]}

Grover, O. ^{[4
]}

Hennequin, P. ^{[5
]}

Hubbard, A. E. ^{[6
]}

Plank, U. ^{[1
]}

Trier, E. ^{[1
]}

Brida, D. ^{[1
]}

David, P. ^{[1
]}

Fischer, R. ^{[1
]}

Gil, L. ^{[7
]}

Hoefler, K. ^{[1
,3
]}

Manz, P. ^{[1
,3
]}

McDermott, R. M. ^{[1
]}

Merle, A. ^{[8
]}

Stroth, U. ^{[1
,3
]}

Viezzer, E. ^{[9
]}

Willensdorfer, M. ^{[1
]}

机构：

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

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

[3] Tech Univ Munich, Phys Dept E28, James Franck Str 1, D-85748 Garching, Germany

[4] Czech Acad Sci, Inst Plasma Phys, Prague, Czech Republic

[5] Ecole Polytech, Lab Phys Plasmas, F-91128 Palaiseau, France

[6] MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[7] Univ Lisbon, Inst Super Tecn, Inst Plasmas & Fusao Nucl, Lisbon, Portugal

[8] Ecole Polytech Fed Lausanne EPFL, Swiss Plasma Ctr SPC, CH-1015 Lausanne, Switzerland

[9] Univ Seville, Dept Atom Mol & Nucl Phys, Seville, Spain

来源：

NUCLEAR FUSION | 2021年 / 61卷 / 03期

关键词：

I-mode; detachment; ELM-free; nitrogen seeding; tokamak; confinement regime; REFLECTOMETRY; DISCHARGES; OPERATION; POWER;

D O I：

10.1088/1741-4326/abd7b7

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：

Experiments on nitrogen assisted divertor detachment in the improved energy confinement mode (I-mode) are reported from the ASDEX Upgrade tokamak. When nitrogen is introduced into the divertor and radiation losses cool the divertor plasma down, a loss of core confinement is observed, concomitant with an increase in low frequency edge fluctuation levels. The loss in confinement can be compensated and the I-mode can be maintained by additional heating power input. Detachment of the inner divertor leg has been observed for the first time in an I-mode discharge. The outer divertor leg remains attached in these experiments. Good energy confinement properties (H-98(y, 2) = 0.9) during the detachment of the inner divertor leg are reported.

引用

页数：11

共 34 条

[31] Design of a correlation reflectometer radiometer diagnostic and measurements of the electron density-temperature cross-phase angle in the H-mode pedestal with small edge localized modes at ASDEX Upgrade
Yoo, C.
Conway, G. D.
Burke, W.
Cabrera, P. A. Molina
Vanovac, B.
Bielajew, R.
Cruz-Zabala, D. J.
Silva, A.
White, A. E.
REVIEW OF SCIENTIFIC INSTRUMENTS, 2025, 96 (03):
[32] Core turbulence behavior moving from ion-temperature-gradient regime towards trapped-electron-mode regime in the ASDEX Upgrade tokamak and comparison with gyrokinetic simulation
Happel, T.
Navarro, A. Banon
Conway, G. D.
Angioni, C.
Bernert, M.
Dunne, M.
Fable, E.
Geiger, B.
Goerler, T.
Jenko, F.
McDermott, R. M.
Ryter, F.
Stroth, U.
PHYSICS OF PLASMAS, 2015, 22 (03)
[33] The dependence of tokamak L-mode confinement on magnetic field and plasma size, from a magnetic field scan experiment at ASDEX Upgrade to full-radius integrated modelling and fusion reactor predictions
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[34] A long-pulse small edge-localized-mode high-confinement plasma with detachment feedback control by floating potential in an experimental advanced superconducting tokamak in a metal wall environment
Ding, G. F.
Xu, G. S.
Tao, Y. Q.
Wu, K.
Yu, L.
Lin, X.
Meng, L. Y.
Wang, L.
Yang, Q. Q.
Chen, R.
Liang, R. R.
Li, K. D.
Zang, Q.
Zhou, Z. Q.
Yuan, Q. P.
Xu, J. C.
NUCLEAR FUSION, 2024, 64 (10)

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