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

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Silvagni, D.
Eich, T.
Happel, T.
Harrer, G. F.
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Cavedon, M.
Faitsch, M.
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Nille, D.
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Fischer, R.
Stroth, U.
Brida, D.
David, P.
Manz, P.
Viezzer, E.
NUCLEAR FUSION, 2020, 60 (12)
[2] Gyrokinetic investigation of the ASDEX Upgrade I-mode pedestal
Stimmel, K.
Navarro, A. Banon
Happel, T.
Told, D.
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Wolfrum, E.
Collar, J. P. Martin
Fischer, R.
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PHYSICS OF PLASMAS, 2019, 26 (12)
[3] Pedestal and core confinement of hybrid scenario in ASDEX Upgrade and DIII-D
Maggi, C. F.
Groebner, R. J.
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Snyder, P. B.
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NUCLEAR FUSION, 2010, 50 (02)
[4] I-mode studies at ASDEX Upgrade: L-I and I-H transitions, pedestal and confinement properties
Ryter, F.
Fischer, R.
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Happel, T.
McDermott, R. M.
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Suttrop, W.
Willensdorfer, M.
NUCLEAR FUSION, 2017, 57 (01)
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Cavedon, M.
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Wolfrum, E.
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Fischer, R.
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PLASMA PHYSICS AND CONTROLLED FUSION, 2020, 62 (02)
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Kurzan, B.
Murmann, H. D.
REVIEW OF SCIENTIFIC INSTRUMENTS, 2011, 82 (10):
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Cavedon, M.
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Laggner, F. M.
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PLASMA PHYSICS AND CONTROLLED FUSION, 2017, 59 (10)
[8] The radial localization of the transition from low to high confinement mode in the ASDEX Upgrade tokamak
Cavedon, M.
Happel, T.
Hennequin, P.
Dux, R.
Hoefler, K.
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Puetterich, T.
Stroth, U.
Viezzer, E.
Wolfrum, E.
PLASMA PHYSICS AND CONTROLLED FUSION, 2024, 66 (02)
[9] Turbulence characteristics of the I-mode confinement regime in ASDEX Upgrade
Manz, P.
Happel, T.
Ryter, F.
Bernert, M.
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Hennequin, P.
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Stroth, U.
Viezzer, E.
NUCLEAR FUSION, 2017, 57 (08)
[10] Characterization of edge turbulence in different states of divertor detachment using reflectometry in the ASDEX Upgrade tokamak
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Guimarais, L.
Manz, P.
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Manso, M. E.
Stroth, U.
Silva, C.
Conway, G. D.
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Vicente, J.
Brida, D.
Aguiam, D.
Santos, J.
Silva, A.
PLASMA PHYSICS AND CONTROLLED FUSION, 2018, 60 (05)

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