Ion Temperature Measurements in the MAST-U Divertor During Steady State Plasmas and ELM Burn Through Phenomena
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| Format: | Preprint |
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2024
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| _version_ | 1866910737304125440 |
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| author | Damizia, Y. Elmore, S. Verhaegh, K. Ryan, P. Allan, S. Federici, F. Osborne, N. Bradley, J. W. Team, the MAST-U Team, the EUROfusion Tokamak Exploitation |
| author_facet | Damizia, Y. Elmore, S. Verhaegh, K. Ryan, P. Allan, S. Federici, F. Osborne, N. Bradley, J. W. Team, the MAST-U Team, the EUROfusion Tokamak Exploitation |
| contents | This study presents ion temperature (\(T_i\)) measurements in the MAST-U divertor, using a Retarding Field Energy Analyzer (RFEA). Steady state measurements were made during an L-Mode plasma with the strike point on the RFEA. ELM measurements were made with the strike point swept over the RFEA. The scenarios are characterized by a plasma current (\(I_p\)) of 750 kA, line average electron density (\(n_e\)) between \(1.6 \times 10^{19}\) and \(4.5 \times 10^{19}\,\text{m}^{-3}\), and Neutral Beam Injection (NBI) power ranging from 1.1 MW to 1.6 MW. The ion temperatures, peaking at approximately 10 eV in steady state, were compared with electron temperatures (\(T_e\)) obtained from Langmuir probes (LP) at the same radial positions. Preliminary findings reveal a \(T_i/T_e\) ratio in the divertor region less than 1 for shot 48008. High temporal resolution measurements captured the dynamics of Edge Localized Modes (ELMs) Burn Through, providing \(T_i\) data as a radial distance from the probe peaking around 20 eV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_07881 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ion Temperature Measurements in the MAST-U Divertor During Steady State Plasmas and ELM Burn Through Phenomena Damizia, Y. Elmore, S. Verhaegh, K. Ryan, P. Allan, S. Federici, F. Osborne, N. Bradley, J. W. Team, the MAST-U Team, the EUROfusion Tokamak Exploitation Plasma Physics This study presents ion temperature (\(T_i\)) measurements in the MAST-U divertor, using a Retarding Field Energy Analyzer (RFEA). Steady state measurements were made during an L-Mode plasma with the strike point on the RFEA. ELM measurements were made with the strike point swept over the RFEA. The scenarios are characterized by a plasma current (\(I_p\)) of 750 kA, line average electron density (\(n_e\)) between \(1.6 \times 10^{19}\) and \(4.5 \times 10^{19}\,\text{m}^{-3}\), and Neutral Beam Injection (NBI) power ranging from 1.1 MW to 1.6 MW. The ion temperatures, peaking at approximately 10 eV in steady state, were compared with electron temperatures (\(T_e\)) obtained from Langmuir probes (LP) at the same radial positions. Preliminary findings reveal a \(T_i/T_e\) ratio in the divertor region less than 1 for shot 48008. High temporal resolution measurements captured the dynamics of Edge Localized Modes (ELMs) Burn Through, providing \(T_i\) data as a radial distance from the probe peaking around 20 eV. |
| title | Ion Temperature Measurements in the MAST-U Divertor During Steady State Plasmas and ELM Burn Through Phenomena |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2411.07881 |