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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PHYSICS OF PLASMAS, 2001, 8 (05) : 1607 - 1611
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PLASMA PHYSICS AND CONTROLLED FUSION, 2019, 61 (09)
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NUCLEAR FUSION, 2020, 60 (09)
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NUCLEAR FUSION, 2002, 42 (10) : 1184 - 1192
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NUCLEAR FUSION, 2020, 60 (12)
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