Impact of nitrogen molecular breakup on divertor conditions in JET L-mode plasmas using SOLPS-ITER

被引：0

作者：

Maenpaa, R. ^{[1
]}

Kumpulainen, H. ^{[1
]}

Groth, M. ^{[1
]}

Horsten, N. ^{[2
]}

Reiter, D. ^{[3
]}

Romazanov, J. ^{[4
]}

Lomanowski, B. ^{[5
]}

Brezinsek, S. ^{[4
]}

Karhunen, J. ^{[6
]}

Lawson, K. D. ^{[7
]}

Meigs, A. G. ^{[7
]}

Menmuir, S. ^{[7
]}

Shaw, A. ^{[7
]}

机构：

[1] Aalto Univ, Otakaari 1, Espoo 02150, Finland

[2] Katholieke Univ Leuven, Leuven, Belgium

[3] Heinrich Heine Univ, Inst Laser & Plasma Phys, Dusseldorf, Germany

[4] Forschungszentrum Julich, Julich, Germany

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

[6] VTT Tech Res Ctr Finland, Espoo, Finland

[7] UKAEA, Abingdon, England

来源：

NUCLEAR MATERIALS AND ENERGY | 2025年 / 43卷

关键词：

Nitrogen; Molecule; Recycling; JET; Divertor; SOLPS-ITER; L-mode; SPECTROSCOPY;

D O I：

10.1016/j.nme.2025.101929

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

SOLPS-ITER simulations of nitrogen-seeded, low-confinement mode plasmas in the Joint European Torus (JET) predict that the electron temperature in the low-field side (LFS) divertor leg is reduced locally by up to an order of magnitude when nitrogen is assumed to recycle as molecules (N-2) instead of atoms using a fixed nitrogen injection rate. The LFS divertor temperature reduction under the assumption of molecular recycling occurs due to a three-step mechanism: (1) the plasma penetration of nitrogen atoms is increased due to the strong triple bond of the N-2 molecule and the kinetic energy release in the dissociation event, both mechanisms contributing equally, (2) the abundance of (particularly multiply-charged) nitrogen ions in the divertor is increased and (3) the electron temperature is reduced due to the increase in radiation (by up to a factor of 4) from nitrogen ions. Setting the volume-integrated nitrogen radiated power to a constant value (0.6 MW) instead of the nitrogen injection rate, SOLPS-ITER predicts under the molecular nitrogen recycling assumption that the peak line-integrated N II, N III and N IV intensities in the LFS divertor are approximately within 15%, 35% and 5%, respectively, of the reference atomic nitrogen recycling case. The predicted peak N II, N III and N IV intensities under either assumption are within 30%, 65% and 5%, respectively, of measurements using the vertically viewing mirror-link divertor spectrometer (Meigs et al., 2010) in nitrogen-seeded JET L-mode plasmas (Lomanowski et al., 2019). ERO2.0 simulations using a constant nitrogen seeding rate on static background plasma solutions from EDGE2D-EIRENE (previously presented in M & auml;enp & auml;& auml; et al., (2022), revised here to include fast reflections) predict that N II to N IV line emission is increased by 20% to 30% when nitrogen is assumed to recycle as molecules, demonstrating the importance of considering the effect of molecular dissociation reactions on the divertor plasma in a self-consistent manner.

引用

页数：9

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