L to H mode transition: parametric dependencies of the temperature threshold
The L to H mode transition occurs at a critical power which depends on various parameters, such as the magnetic field, the density, etc. Experimental evidence on various tokamaks (JET, ASDEX-Upgrade, DIII-D, Alcator C-Mod) points towards the existence of a critical temperature characterizing the tra...
| Authors: | ; ; ; ; ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2015 |
| Country: | España |
| Institution: | Universidad de Sevilla (US) |
| Repository: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/100538 |
| Online Access: | https://hdl.handle.net/11441/100538 https://doi.org/10.1088/0029-5515/55/7/073015 |
| Access Level: | Open access |
| Keyword: | Plasma physics L H transition Tokamak |
| _version_ | 1878733831477919744 |
|---|---|
| author | Bourdelle, C. |
| author2 | Chonê, L. Fedorczak, N. Garbet, X. Beyer, P. Jet Contributors García Muñoz, Manuel |
| author2_role | author author author author author author |
| author_browse | Beyer, P. Bourdelle, C. Chonê, L. Fedorczak, N. Garbet, X. García Muñoz, Manuel Jet Contributors |
| author_facet | Bourdelle, C. Chonê, L. Fedorczak, N. Garbet, X. Beyer, P. Jet Contributors García Muñoz, Manuel |
| author_role | author |
| collection | idUS. Depósito de Investigación de la Universidad de Sevilla |
| description | The L to H mode transition occurs at a critical power which depends on various parameters, such as the magnetic field, the density, etc. Experimental evidence on various tokamaks (JET, ASDEX-Upgrade, DIII-D, Alcator C-Mod) points towards the existence of a critical temperature characterizing the transition. This criterion for the L-H transition is local and is therefore easier to be compared to theoretical approaches. In order to shed light on the mechanisms of the transition, simple theoretical ideas are used to derive a temperature threshold (Tth). They are based on the stabilization of the underlying turbulence by a mean radial electric field shear. The nature of the turbulence varies as the collisionality decreases, from resistive ballooning modes to ion temperature gradient and trapped electron modes. The obtained parametric dependencies of the derived Tth are tested versus magnetic field, density, effective charge. Various robust experimental observations are reproduced, in particular Tth increases with magnetic field B and increases with density below the density roll-over observed on the power threshold. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_5dd1db377faf4e4fe0262efffaba3b71 |
| institution | Universidad de Sevilla (US) |
| instname_str | Universidad de Sevilla (US) |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:idus.us.es:11441/100538 |
| publishDate | 2015 |
| publishDateSort | 2015 |
| publisher | IOP Publishing |
| publisherStr | IOP Publishing |
| reponame_str | idUS. Depósito de Investigación de la Universidad de Sevilla |
| spelling | L to H mode transition: parametric dependencies of the temperature threshold Bourdelle, C. Chonê, L. Fedorczak, N. Garbet, X. Beyer, P. Jet Contributors García Muñoz, Manuel Plasma physics L H transition Tokamak The L to H mode transition occurs at a critical power which depends on various parameters, such as the magnetic field, the density, etc. Experimental evidence on various tokamaks (JET, ASDEX-Upgrade, DIII-D, Alcator C-Mod) points towards the existence of a critical temperature characterizing the transition. This criterion for the L-H transition is local and is therefore easier to be compared to theoretical approaches. In order to shed light on the mechanisms of the transition, simple theoretical ideas are used to derive a temperature threshold (Tth). They are based on the stabilization of the underlying turbulence by a mean radial electric field shear. The nature of the turbulence varies as the collisionality decreases, from resistive ballooning modes to ion temperature gradient and trapped electron modes. The obtained parametric dependencies of the derived Tth are tested versus magnetic field, density, effective charge. Various robust experimental observations are reproduced, in particular Tth increases with magnetic field B and increases with density below the density roll-over observed on the power threshold. EURATOM 633053 IOP Publishing https://hdl.handle.net/11441/100538 https://doi.org/10.1088/0029-5515/55/7/073015 |
| spellingShingle | L to H mode transition: parametric dependencies of the temperature threshold Bourdelle, C. Plasma physics L H transition Tokamak |
| status_str | publishedVersion |
| title | L to H mode transition: parametric dependencies of the temperature threshold |
| title_full | L to H mode transition: parametric dependencies of the temperature threshold |
| title_fullStr | L to H mode transition: parametric dependencies of the temperature threshold |
| title_full_unstemmed | L to H mode transition: parametric dependencies of the temperature threshold |
| title_short | L to H mode transition: parametric dependencies of the temperature threshold |
| title_sort | L to H mode transition: parametric dependencies of the temperature threshold |
| topic | Plasma physics L H transition Tokamak |
| topic_facet | Plasma physics L H transition Tokamak |
| url | https://hdl.handle.net/11441/100538 https://doi.org/10.1088/0029-5515/55/7/073015 |