Balmer emission measurements in JET-ILW hydrogen, deuterium, tritium and deuterium-tritium low-confinement mode plasmas

被引：0

作者：

Meigs, A. G. ^{[1
]}

Groth, M. ^{[2
]}

Rikala, V. -P. ^{[2
]}

Lomanowski, B. ^{[3
]}

Vianello, N. ^{[4
]}

Wischmeier, M. ^{[5
]}

机构：

[1] UKAEA, Culham Campus, Abingdon OX14 3DB, Oxon, England

[2] Aalto Univ, Espoo, Finland

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

[4] Univ Padua, Consorzio RFX, ENEA, INFN,CNR, Padua, Italy

[5] Max Planck Inst Plasma Phys, Garching, Germany

来源：

NUCLEAR MATERIALS AND ENERGY | 2025年 / 43卷

关键词：

JET; Divertor; Balmer; Detachment; Density limit; Spectroscopy; DT;

D O I：

10.1016/j.nme.2025.101941

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：

Measurements of Balmer-alpha (B-alpha) and Balmer-gamma (B-gamma), where B = H, D, or T isotopes of hydrogen, emission across the low-field side (LFS) divertor in JET ITER-like Wall (ILW), low-confinement mode (L-mode) plasma indicate that the divertor plasma was more strongly detached in deuterium, tritium and deuterium-tritium than in hydrogen plasmas. These measurements are consistent with the lower degree of detachment in hydrogen versus tritium plasmas inferred from Langmuir probes (Groth et al., 2023) [1]. The ratio of B-gamma to B-alpha is a suitable indicator of high density/low temperature conditions because B-alpha emission is dominated by electron impact excitation with a small electron-ion recombination component regardless of electron temperature and density (for conditions in tokamak plasmas) whilst for B-gamma the recombination component increases and the excitation component decreases as the electron temperature decreases and the electron density increases. Within the uncertainty of the measurements, the electron density at the low-field side separatrix and the power crossing the separatrix are similar to permit these comparisons. The B-(c)/B-alpha ratio is well correlated with the onset of detachment as measured by Langmuir probes (McCracken et al., 1998; Groth et al., 2023). The ratios of B-gamma and B-alpha varied between 0.005 and 0.035 for low-recycling, high-recycling and partially detached conditions, and were 60-70 % higher in partially detached hydrogen than in tritium plasmas. In contrast, the difference between deuterium, tritium and 40-60 % deuterium-tritium is within 10 % and thus within the uncertainties of the measurements. Profiles of the B-alpha and B-gamma emission was measured with two filtered CCDs connected to the visible lost light leg of JET's mirror link spectroscopy system (Meigs et al., 2010; Lomanowski et al., 2014)[4,5]. Spatially (radial) narrower B-alpha profiles were measured with increasing isotope mass, while similarly broadened B-gamma profiles were measured.

引用

页数：7

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