View in EDS

Investigation of multi-ion heat and neoclassical transport using new edge main ion measurements at ASDEX Upgrade.

Saved in:
Bibliographic Details
Title: Investigation of multi-ion heat and neoclassical transport using new edge main ion measurements at ASDEX Upgrade.
Authors: Cano-Megias, P.1,2 (AUTHOR) pcano1@us.es, Viezzer, E.2 (AUTHOR), McDermott, R.M.1 (AUTHOR), Angioni, C.1 (AUTHOR), Fable, E.1 (AUTHOR), Jansen van Vuuren, A.3 (AUTHOR), Cavedon, M.4 (AUTHOR), Cruz-Zabala, D.J.2 (AUTHOR), Dux, R.1 (AUTHOR), Manas, P.5 (AUTHOR), P.-Gonzalez, J.2 (AUTHOR), Takacs, R.1 (AUTHOR), Zimmermann, C.F.B.1,6 (AUTHOR), Chacartegui, R.2 (AUTHOR)
Source: Nuclear Fusion. Sep2025, Vol. 65 Issue 9, p1-22. 22p.
Subjects: H-mode plasma confinement, Deuterium ions, Velocity, Plasma boundary layers, Thermal conductivity, Tokamaks, Heat transfer, Transport theory
Abstract: This study provides new insights into multi-ion heat transport and the validation of neoclassical theory at the edge of H-mode plasmas. Utilizing a high-resolution main ion charge exchange recombination spectroscopy system, the first characterization of edge deuterium temperature (TD) and toroidal velocity ( v ϕ , D ) in a metal wall environment is presented. Dedicated experiments which examine the impact of the heating mix on TD and v ϕ , D in the ASDEX Upgrade tokamak are discussed. An unexpected temperature difference between main ions (TD) and impurities (Tz) was discovered when increasing P ECRH , T D > T z . The new temperature measurements have been used to solve the multi-ion heat transport equations with the astra transport code. The interpreted deuterium (χ D ) and impurity (χ z ) heat diffusivities have been compared to fluid (tglf) and gyrokinetic (gkw) models. While the dependence of a qualitatively similar χ D / χ z on the ion to electron heat flux ( Q i / Q e ) was identified in both experiment and simulation, discrepancies in the absolute value between the two are found when temperature differences between deuterium and impurities are present. The mechanism for the χ D / χ z dependence on Q i / Q e is the stronger resonant interaction of impurities with low drift frequency turbulence modes in comparison to deuterium. Importantly, it is shown that considering a single ion species (i), and assuming T D = T z gives reasonable estimates of χ D ≈ χ i for the cases studied here. On the contrary, the evaluation of χ z is very sensitive to ion temperature differences, which must be considered for accurate impurity ion heat transport description. Additionally, differences between v ϕ , D and v ϕ , z were compared to neoclassical calculations. Neoclassical theory can accurately describe v ϕ , D (provided an independent measurement of v ϕ , z or Er) in the steep gradient region, but not at the pedestal top nor bottom, highlighting the complexity of edge transport phenomena. [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: 187906159
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Investigation of multi-ion heat and neoclassical transport using new edge main ion measurements at ASDEX Upgrade.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Cano-Megias%2C+P%2E%22">Cano-Megias, P.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> pcano1@us.es</i><br /><searchLink fieldCode="AR" term="%22Viezzer%2C+E%2E%22">Viezzer, E.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22McDermott%2C+R%2EM%2E%22">McDermott, R.M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Angioni%2C+C%2E%22">Angioni, C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fable%2C+E%2E%22">Fable, E.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jansen+van+Vuuren%2C+A%2E%22">Jansen van Vuuren, A.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cavedon%2C+M%2E%22">Cavedon, M.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cruz-Zabala%2C+D%2EJ%2E%22">Cruz-Zabala, D.J.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dux%2C+R%2E%22">Dux, R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Manas%2C+P%2E%22">Manas, P.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22P%2E-Gonzalez%2C+J%2E%22">P.-Gonzalez, J.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Takacs%2C+R%2E%22">Takacs, R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zimmermann%2C+C%2EF%2EB%2E%22">Zimmermann, C.F.B.</searchLink><relatesTo>1,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chacartegui%2C+R%2E%22">Chacartegui, R.</searchLink><relatesTo>2</relatesTo> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Nuclear+Fusion%22">Nuclear Fusion</searchLink>. Sep2025, Vol. 65 Issue 9, p1-22. 22p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22H-mode+plasma+confinement%22">H-mode plasma confinement</searchLink><br /><searchLink fieldCode="DE" term="%22Deuterium+ions%22">Deuterium ions</searchLink><br /><searchLink fieldCode="DE" term="%22Velocity%22">Velocity</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+boundary+layers%22">Plasma boundary layers</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Transport+theory%22">Transport theory</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study provides new insights into multi-ion heat transport and the validation of neoclassical theory at the edge of H-mode plasmas. Utilizing a high-resolution main ion charge exchange recombination spectroscopy system, the first characterization of edge deuterium temperature (TD) and toroidal velocity ( v ϕ , D ) in a metal wall environment is presented. Dedicated experiments which examine the impact of the heating mix on TD and v ϕ , D in the ASDEX Upgrade tokamak are discussed. An unexpected temperature difference between main ions (TD) and impurities (Tz) was discovered when increasing P ECRH , T D > T z . The new temperature measurements have been used to solve the multi-ion heat transport equations with the astra transport code. The interpreted deuterium (χ D ) and impurity (χ z ) heat diffusivities have been compared to fluid (tglf) and gyrokinetic (gkw) models. While the dependence of a qualitatively similar χ D / χ z on the ion to electron heat flux ( Q i / Q e ) was identified in both experiment and simulation, discrepancies in the absolute value between the two are found when temperature differences between deuterium and impurities are present. The mechanism for the χ D / χ z dependence on Q i / Q e is the stronger resonant interaction of impurities with low drift frequency turbulence modes in comparison to deuterium. Importantly, it is shown that considering a single ion species (i), and assuming T D = T z gives reasonable estimates of χ D ≈ χ i for the cases studied here. On the contrary, the evaluation of χ z is very sensitive to ion temperature differences, which must be considered for accurate impurity ion heat transport description. Additionally, differences between v ϕ , D and v ϕ , z were compared to neoclassical calculations. Neoclassical theory can accurately describe v ϕ , D (provided an independent measurement of v ϕ , z or Er) in the steep gradient region, but not at the pedestal top nor bottom, highlighting the complexity of edge transport phenomena. [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=187906159
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1088/1741-4326/adf3cb
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 22
        StartPage: 1
    Subjects:
      – SubjectFull: H-mode plasma confinement
        Type: general
      – SubjectFull: Deuterium ions
        Type: general
      – SubjectFull: Velocity
        Type: general
      – SubjectFull: Plasma boundary layers
        Type: general
      – SubjectFull: Thermal conductivity
        Type: general
      – SubjectFull: Tokamaks
        Type: general
      – SubjectFull: Heat transfer
        Type: general
      – SubjectFull: Transport theory
        Type: general
    Titles:
      – TitleFull: Investigation of multi-ion heat and neoclassical transport using new edge main ion measurements at ASDEX Upgrade.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Cano-Megias, P.
      – PersonEntity:
          Name:
            NameFull: Viezzer, E.
      – PersonEntity:
          Name:
            NameFull: McDermott, R.M.
      – PersonEntity:
          Name:
            NameFull: Angioni, C.
      – PersonEntity:
          Name:
            NameFull: Fable, E.
      – PersonEntity:
          Name:
            NameFull: Jansen van Vuuren, A.
      – PersonEntity:
          Name:
            NameFull: Cavedon, M.
      – PersonEntity:
          Name:
            NameFull: Cruz-Zabala, D.J.
      – PersonEntity:
          Name:
            NameFull: Dux, R.
      – PersonEntity:
          Name:
            NameFull: Manas, P.
      – PersonEntity:
          Name:
            NameFull: P.-Gonzalez, J.
      – PersonEntity:
          Name:
            NameFull: Takacs, R.
      – PersonEntity:
          Name:
            NameFull: Zimmermann, C.F.B.
      – PersonEntity:
          Name:
            NameFull: Chacartegui, R.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 00295515
          Numbering:
            – Type: volume
              Value: 65
            – Type: issue
              Value: 9
          Titles:
            – TitleFull: Nuclear Fusion
              Type: main
ResultId 1