Threshold power for the transition into H-mode for H, D, and He plasmas in TCV.
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| Title: | Threshold power for the transition into H-mode for H, D, and He plasmas in TCV. |
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| Authors: | R Behn1 roland.behn@epfl.ch, B Labit1, B P Duval1, A Karpushov1, Y Martin1, L Porte1 |
| Source: | Plasma Physics & Controlled Fusion. Feb2015, Vol. 57 Issue 2, p1-1. 1p. |
| Subjects: | Threshold voltage, Hydrogen, Deuterium, Helium, Tokamaks, Plasma currents |
| Abstract: | The threshold power for the transition into H-mode with hydrogen (H), deuterium (D), and helium (He) as majority ion species has been evaluated from a series of dedicated experiments on the tokamak TCV. Identical plasma configurations with a single-null X-point and favorable direction of the ion ∇B drift have been chosen. The input power was varied via the plasma current and L–H transitions were obtained with Ohmic heating alone. Under these conditions and for electron densities in the range of 6–7 · 1019 m−3 the threshold power compared to D increased by 1.75 for H and 1.45 for He, respectively. For D and He, the measured power levels are in good agreement with the predictions of the commonly used scaling law. In the case of H, transitions into H-mode were observed already at power levels of about 80% of the expected threshold power.Our results have also been analyzed on the basis of a physics-based scaling, which includes more parameters and applies to all ion species. Using the case of D as reference, we find that the increase in threshold power for He follows the predictions. For H there is a noticeable disagreement which may partly be explained by uncertainties in the relevant plasma parameters. The new scaling implies a strong dependence on the values of the electron temperature at the separatrix. For the present study, only data up to a normalized radius of 0.95 were available. More precise measurements of the edge temperature profiles may help to resolve the issue. [ABSTRACT FROM AUTHOR] |
| Copyright of Plasma Physics & Controlled Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 100536454 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Threshold power for the transition into H-mode for H, D, and He plasmas in TCV. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22R+Behn%22">R Behn</searchLink><relatesTo>1</relatesTo><i> roland.behn@epfl.ch</i><br /><searchLink fieldCode="AR" term="%22B+Labit%22">B Labit</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22B+P+Duval%22">B P Duval</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22A+Karpushov%22">A Karpushov</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Y+Martin%22">Y Martin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22L+Porte%22">L Porte</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Plasma+Physics+%26+Controlled+Fusion%22">Plasma Physics & Controlled Fusion</searchLink>. Feb2015, Vol. 57 Issue 2, p1-1. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Threshold+voltage%22">Threshold voltage</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen%22">Hydrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Deuterium%22">Deuterium</searchLink><br /><searchLink fieldCode="DE" term="%22Helium%22">Helium</searchLink><br /><searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+currents%22">Plasma currents</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The threshold power for the transition into H-mode with hydrogen (H), deuterium (D), and helium (He) as majority ion species has been evaluated from a series of dedicated experiments on the tokamak TCV. Identical plasma configurations with a single-null X-point and favorable direction of the ion ∇B drift have been chosen. The input power was varied via the plasma current and L–H transitions were obtained with Ohmic heating alone. Under these conditions and for electron densities in the range of 6–7 · 1019 m−3 the threshold power compared to D increased by 1.75 for H and 1.45 for He, respectively. For D and He, the measured power levels are in good agreement with the predictions of the commonly used scaling law. In the case of H, transitions into H-mode were observed already at power levels of about 80% of the expected threshold power.Our results have also been analyzed on the basis of a physics-based scaling, which includes more parameters and applies to all ion species. Using the case of D as reference, we find that the increase in threshold power for He follows the predictions. For H there is a noticeable disagreement which may partly be explained by uncertainties in the relevant plasma parameters. The new scaling implies a strong dependence on the values of the electron temperature at the separatrix. For the present study, only data up to a normalized radius of 0.95 were available. More precise measurements of the edge temperature profiles may help to resolve the issue. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Plasma Physics & Controlled Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1088/0741-3335/57/2/025007 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: 1 Subjects: – SubjectFull: Threshold voltage Type: general – SubjectFull: Hydrogen Type: general – SubjectFull: Deuterium Type: general – SubjectFull: Helium Type: general – SubjectFull: Tokamaks Type: general – SubjectFull: Plasma currents Type: general Titles: – TitleFull: Threshold power for the transition into H-mode for H, D, and He plasmas in TCV. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: R Behn – PersonEntity: Name: NameFull: B Labit – PersonEntity: Name: NameFull: B P Duval – PersonEntity: Name: NameFull: A Karpushov – PersonEntity: Name: NameFull: Y Martin – PersonEntity: Name: NameFull: L Porte IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 07413335 Numbering: – Type: volume Value: 57 – Type: issue Value: 2 Titles: – TitleFull: Plasma Physics & Controlled Fusion Type: main |
| ResultId | 1 |
