Peculiarity of highly radiating multi-impurity seeded H-mode plasmas on JET with ITER-like wall

被引：18

作者：

Huber, A. ^{[1
]}

Wischmeier, M. ^{[2
]}

Bernert, M. ^{[2
]}

Wiesen, S. ^{[1
]}

Gloeggler, S. ^{[2
]}

Aleiferis, S. ^{[3
]}

Brezinsek, S. ^{[1
]}

Calabro, G. ^{[4
,5
]}

Carvalho, P. ^{[5
]}

Huber, V. ^{[6
]}

Sergienko, G. ^{[1
]}

Solano, E. R. ^{[7
]}

Giroud, C. ^{[8
]}

Groth, M. ^{[9
]}

Jachmich, S. ^{[10
]}

Linsmeier, Ch ^{[1
]}

Matthews, G. F. ^{[8
]}

Meigs, A. G. ^{[8
]}

Mertens, Ph ^{[1
]}

Sertoli, M. ^{[2
]}

Silburn, S. ^{[8
]}

Telesca, G. ^{[11
]}

机构：

[1] Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, Partner Trilateral Euregio Cluster TEC, D-52425 Julich, Germany

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

[3] NCSR Demokritos, Aghia Paraskevi 15310, Greece

[4] Univ Tuscia, Dept Econ Engn Soc & Business Org DEIm, Largo Univ Snc, I-01100 Viterbo, Italy

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

[6] Forschungszentrum Julich, Supercomp Ctr, D-52425 Julich, Germany

[7] CIEMAT, Lab Nacl Fus, Madrid, Spain

[8] CCFE, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[9] Aalto Univ, Assoc EURATOM Tekes, POB 4100, FI-2015 Espoo, Finland

[10] ERM KMS, Plasma Phys Lab, B-1000 Brussels, Belgium

[11] Inst Plasma Phys & Laser Microfus, Warsaw, Poland

来源：

PHYSICA SCRIPTA | 2020年 / T171卷 / 01期

关键词：

power exhaust; radiation; impurities in plasmas; divertors; detachment; tokamaks; ASDEX UPGRADE; POWER;

D O I：

10.1088/1402-4896/ab5753

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

On JET with fully metallic first wall, highly radiative conditions with N-2, Ne and Ar as well as their mixture as radiators are approached in high density H-mode plasmas. The confinement increases from H-98( y,H-2) =.0.65 in unseeded pulses with gamma(rad) similar to 30% to a value of H-98(y,H-2)=.0.75 at gamma(rad) similar to 50% with N-2 injection. A degradation of the pedestal profile is compensated by steeper core ne and Te profiles. Further increase of gamma(rad) with increase of the N-2 seeding rate leads to a moderate confinement degradation which can be avoided by applying of combined impurity seeding. The enhancement of the plasma performance for the radiation fractions beyond 55% with the maximum value of H-98(y,H-2) = .0.78 is reached with combined N-2 + Ne and N-2+ Ar impurity injections. The observed intense, strongly localized radiation at the X-point inside the confined plasma in the scenarios with the highest radiated power fraction is interlinked to complete divertor detachment. In the JET-ILW, the X-point radiation is stable, reproducible and reversible.

引用

页数：7

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