View in EDS

Results from recent detachment experiments in alternative divertor configurations on TCV.

Saved in:
Bibliographic Details
Title: Results from recent detachment experiments in alternative divertor configurations on TCV.
Authors: C. Theiler1 christian.theiler@epfl.ch, B. Lipschultz2, J. Harrison3, B. Labit1, H. Reimerdes1, C. Tsui1,4, W.A.J. Vijvers5, J. A. Boedo4, B.P. Duval1, S. Elmore3, P. Innocente6, U. Kruezi3, T. Lunt7, R. Maurizio1, F. Nespoli1, U. Sheikh1, A.J. Thornton3, S.H.M. van Limpt5, K. Verhaegh1,2, N. Vianello6
Source: Nuclear Fusion. July2017, Vol. 57 Issue 7, p1-1. 1p.
Subjects: Diverters (Electronics), Tokamaks, Plasma engineering, Plasma devices, Electrical surge protection
Abstract: Divertor detachment is explored on the TCV tokamak in alternative magnetic geometries. Starting from typical TCV single-null shapes, the poloidal flux expansion at the outer strikepoint is varied by a factor of 10 to investigate the X-divertor characteristics, and the total flux expansion is varied by 70 to study the properties of the super-X divertor. The effect of an additional X-point near the target is investigated in X-point target divertors. Detachment of the outer target is studied in these plasmas during Ohmic density ramps and with the ion B drift away from the primary X-point. The detachment threshold, depth of detachment, and the stability of the radiation location are investigated using target measurements from the wall-embedded Langmuir probes and two-dimensional CIII line emissivity profiles across the divertor region, obtained from inverted, toroidally-integrated camera data. It is found that increasing poloidal flux expansion results in a deeper detachment for a given line-averaged density and a reduction in the radiation location sensitivity to core density, while no large effect on the detachment threshold is observed. The total flux expansion, contrary to expectations, does not show a significant influence on any detachment characteristics in these experiments. In X-point target geometries, no evidence is found for a reduced detachment threshold despite a 2–3 fold increase in connection length. A reduced radiation location sensitivity to core plasma density in the vicinity of the target X-point is suggested by the measurements. [ABSTRACT FROM AUTHOR]
Copyright of Nuclear 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
Header DbId: egs
DbLabel: Engineering Source
An: 123459169
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Results from recent detachment experiments in alternative divertor configurations on TCV.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22C%2E+Theiler%22">C. Theiler</searchLink><relatesTo>1</relatesTo><i> christian.theiler@epfl.ch</i><br /><searchLink fieldCode="AR" term="%22B%2E+Lipschultz%22">B. Lipschultz</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22J%2E+Harrison%22">J. Harrison</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22B%2E+Labit%22">B. Labit</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22H%2E+Reimerdes%22">H. Reimerdes</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22C%2E+Tsui%22">C. Tsui</searchLink><relatesTo>1,4</relatesTo><br /><searchLink fieldCode="AR" term="%22W%2EA%2EJ%2E+Vijvers%22">W.A.J. Vijvers</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22J%2E+A%2E+Boedo%22">J. A. Boedo</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22B%2EP%2E+Duval%22">B.P. Duval</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22S%2E+Elmore%22">S. Elmore</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22P%2E+Innocente%22">P. Innocente</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22U%2E+Kruezi%22">U. Kruezi</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22T%2E+Lunt%22">T. Lunt</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22R%2E+Maurizio%22">R. Maurizio</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22F%2E+Nespoli%22">F. Nespoli</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22U%2E+Sheikh%22">U. Sheikh</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22A%2EJ%2E+Thornton%22">A.J. Thornton</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22S%2EH%2EM%2E+van+Limpt%22">S.H.M. van Limpt</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22K%2E+Verhaegh%22">K. Verhaegh</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22N%2E+Vianello%22">N. Vianello</searchLink><relatesTo>6</relatesTo>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Nuclear+Fusion%22">Nuclear Fusion</searchLink>. July2017, Vol. 57 Issue 7, p1-1. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Diverters+%28Electronics%29%22">Diverters (Electronics)</searchLink><br /><searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+engineering%22">Plasma engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+devices%22">Plasma devices</searchLink><br /><searchLink fieldCode="DE" term="%22Electrical+surge+protection%22">Electrical surge protection</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Divertor detachment is explored on the TCV tokamak in alternative magnetic geometries. Starting from typical TCV single-null shapes, the poloidal flux expansion at the outer strikepoint is varied by a factor of 10 to investigate the X-divertor characteristics, and the total flux expansion is varied by 70 to study the properties of the super-X divertor. The effect of an additional X-point near the target is investigated in X-point target divertors. Detachment of the outer target is studied in these plasmas during Ohmic density ramps and with the ion B drift away from the primary X-point. The detachment threshold, depth of detachment, and the stability of the radiation location are investigated using target measurements from the wall-embedded Langmuir probes and two-dimensional CIII line emissivity profiles across the divertor region, obtained from inverted, toroidally-integrated camera data. It is found that increasing poloidal flux expansion results in a deeper detachment for a given line-averaged density and a reduction in the radiation location sensitivity to core density, while no large effect on the detachment threshold is observed. The total flux expansion, contrary to expectations, does not show a significant influence on any detachment characteristics in these experiments. In X-point target geometries, no evidence is found for a reduced detachment threshold despite a 2–3 fold increase in connection length. A reduced radiation location sensitivity to core plasma density in the vicinity of the target X-point is suggested by the measurements. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nuclear 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=123459169
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1088/1741-4326/aa5fb7
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: 1
    Subjects:
      – SubjectFull: Diverters (Electronics)
        Type: general
      – SubjectFull: Tokamaks
        Type: general
      – SubjectFull: Plasma engineering
        Type: general
      – SubjectFull: Plasma devices
        Type: general
      – SubjectFull: Electrical surge protection
        Type: general
    Titles:
      – TitleFull: Results from recent detachment experiments in alternative divertor configurations on TCV.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: C. Theiler
      – PersonEntity:
          Name:
            NameFull: B. Lipschultz
      – PersonEntity:
          Name:
            NameFull: J. Harrison
      – PersonEntity:
          Name:
            NameFull: B. Labit
      – PersonEntity:
          Name:
            NameFull: H. Reimerdes
      – PersonEntity:
          Name:
            NameFull: C. Tsui
      – PersonEntity:
          Name:
            NameFull: W.A.J. Vijvers
      – PersonEntity:
          Name:
            NameFull: J. A. Boedo
      – PersonEntity:
          Name:
            NameFull: B.P. Duval
      – PersonEntity:
          Name:
            NameFull: S. Elmore
      – PersonEntity:
          Name:
            NameFull: P. Innocente
      – PersonEntity:
          Name:
            NameFull: U. Kruezi
      – PersonEntity:
          Name:
            NameFull: T. Lunt
      – PersonEntity:
          Name:
            NameFull: R. Maurizio
      – PersonEntity:
          Name:
            NameFull: F. Nespoli
      – PersonEntity:
          Name:
            NameFull: U. Sheikh
      – PersonEntity:
          Name:
            NameFull: A.J. Thornton
      – PersonEntity:
          Name:
            NameFull: S.H.M. van Limpt
      – PersonEntity:
          Name:
            NameFull: K. Verhaegh
      – PersonEntity:
          Name:
            NameFull: N. Vianello
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 07
              Text: July2017
              Type: published
              Y: 2017
          Identifiers:
            – Type: issn-print
              Value: 00295515
          Numbering:
            – Type: volume
              Value: 57
            – Type: issue
              Value: 7
          Titles:
            – TitleFull: Nuclear Fusion
              Type: main
ResultId 1