Modelling of power exhaust in TCV positive and negative triangularity L-mode plasmas
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Tonello, E. Mombelli, F. Février, O. Alberti, G. Bolzonella, T. Durr-Legoupil-Nicoud, G. Gorno, S. Reimerdes, H. Theiler, C. Vianello, N. Passoni, M. team, the TCV team, the WPTE |
| author_facet | Tonello, E. Mombelli, F. Février, O. Alberti, G. Bolzonella, T. Durr-Legoupil-Nicoud, G. Gorno, S. Reimerdes, H. Theiler, C. Vianello, N. Passoni, M. team, the TCV team, the WPTE |
| contents | L-mode negative triangularity (NT) operation is a promising alternative to the positive triangularity (PT) H-mode as a high-confinement ELM-free operational regime. In this work, two TCV L-mode lower single null Ohmic discharges with opposite triangularity $δ\simeq \pm 0.3$ are investigated using SOLPS-ITER modelling. The main focus is the exploration of the reasons behind the experimentally observed feature of NT plasmas being more difficult to detach than similar PT experiments. SOLPS-ITER simulations are performed assuming the same anomalous diffusivity for particles $D_n^{AN}$ and energy $κ_{e/i}^{AN}$ in PT and NT. Nonetheless, the results clearly show dissimilar transport and accumulation of neutral particles in the scrape-off layer (SOL) of the two configurations, which consequently gives rise to different ionization sources for the plasma and produces different poloidal and cross-field fluxes. Simulations also recover the experimental feature of the outer target being hotter in the NT scenario (with $T_{e, NT} \gtrsim 5 \, \mathrm{eV}$) than in the PT counterpart. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_03782 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Modelling of power exhaust in TCV positive and negative triangularity L-mode plasmas Tonello, E. Mombelli, F. Février, O. Alberti, G. Bolzonella, T. Durr-Legoupil-Nicoud, G. Gorno, S. Reimerdes, H. Theiler, C. Vianello, N. Passoni, M. team, the TCV team, the WPTE Plasma Physics L-mode negative triangularity (NT) operation is a promising alternative to the positive triangularity (PT) H-mode as a high-confinement ELM-free operational regime. In this work, two TCV L-mode lower single null Ohmic discharges with opposite triangularity $δ\simeq \pm 0.3$ are investigated using SOLPS-ITER modelling. The main focus is the exploration of the reasons behind the experimentally observed feature of NT plasmas being more difficult to detach than similar PT experiments. SOLPS-ITER simulations are performed assuming the same anomalous diffusivity for particles $D_n^{AN}$ and energy $κ_{e/i}^{AN}$ in PT and NT. Nonetheless, the results clearly show dissimilar transport and accumulation of neutral particles in the scrape-off layer (SOL) of the two configurations, which consequently gives rise to different ionization sources for the plasma and produces different poloidal and cross-field fluxes. Simulations also recover the experimental feature of the outer target being hotter in the NT scenario (with $T_{e, NT} \gtrsim 5 \, \mathrm{eV}$) than in the PT counterpart. |
| title | Modelling of power exhaust in TCV positive and negative triangularity L-mode plasmas |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2401.03782 |