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High resolution density pedestal measurements during edge localized modes by short-pulse reflectometry in the TCV tokamak.

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Title: High resolution density pedestal measurements during edge localized modes by short-pulse reflectometry in the TCV tokamak.
Authors: Cabrera, P A Molina1,2,3,4 (AUTHOR), Labit, B2 (AUTHOR), Coda, S2 (AUTHOR), Porte, L2 (AUTHOR) molinaca@mit.edu, team, the TCV5 (AUTHOR)
Source: Plasma Physics & Controlled Fusion. Aug2021, Vol. 63 Issue 8, p1-13. 13p.
Subjects: Reflectometry, Pedestals, Density, Tokamaks, Fusion reactors, Edges (Geometry), Reflectometer
Abstract: This publication presents high spatio-temporal resolution (mm µs−1) density profile measurements of the pedestal top during type I, III, and small edge localized mode (ELM) H-mode plasmas in the tokamak ŕ configuration variable (TCV). These measurements were performed using a novel short-pulse reflectometer. Average inter-ELM density profiles are obtained via conditional averaging using the D trace as ELM indicator. Changes to the pedestal density profile gradients prior to type-III ELMs reveal unique pedestal dynamics leading to the ELM crash which can provide important experimental data for validation of non-linear MHD ELM simulations. The small-ELM scenario is found to feature a ∼25–35 kHz quasi-coherent density fluctuation near the separatrix 0.993–1.05 not observed during a similar type-I ELM discharge. This oscillation is also found in low-field-side magnetic pick-up probes displaying a ballooning character and n = +1 toroidal mode number. This oscillation could help explain the markedly different pedestal dynamics observed in the small-ELM regime. [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.)
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DbLabel: Engineering Source
An: 153066798
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PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
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  Data: High resolution density pedestal measurements during edge localized modes by short-pulse reflectometry in the TCV tokamak.
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  Data: <searchLink fieldCode="AR" term="%22Cabrera%2C+P+A+Molina%22">Cabrera, P A Molina</searchLink><relatesTo>1,2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Labit%2C+B%22">Labit, B</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Coda%2C+S%22">Coda, S</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Porte%2C+L%22">Porte, L</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> molinaca@mit.edu</i><br /><searchLink fieldCode="AR" term="%22team%2C+the+TCV%22">team, the TCV</searchLink><relatesTo>5</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Plasma+Physics+%26+Controlled+Fusion%22">Plasma Physics & Controlled Fusion</searchLink>. Aug2021, Vol. 63 Issue 8, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Reflectometry%22">Reflectometry</searchLink><br /><searchLink fieldCode="DE" term="%22Pedestals%22">Pedestals</searchLink><br /><searchLink fieldCode="DE" term="%22Density%22">Density</searchLink><br /><searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink><br /><searchLink fieldCode="DE" term="%22Fusion+reactors%22">Fusion reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Edges+%28Geometry%29%22">Edges (Geometry)</searchLink><br /><searchLink fieldCode="DE" term="%22Reflectometer%22">Reflectometer</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This publication presents high spatio-temporal resolution (mm µs−1) density profile measurements of the pedestal top during type I, III, and small edge localized mode (ELM) H-mode plasmas in the tokamak ŕ configuration variable (TCV). These measurements were performed using a novel short-pulse reflectometer. Average inter-ELM density profiles are obtained via conditional averaging using the D trace as ELM indicator. Changes to the pedestal density profile gradients prior to type-III ELMs reveal unique pedestal dynamics leading to the ELM crash which can provide important experimental data for validation of non-linear MHD ELM simulations. The small-ELM scenario is found to feature a ∼25–35 kHz quasi-coherent density fluctuation near the separatrix 0.993–1.05 not observed during a similar type-I ELM discharge. This oscillation is also found in low-field-side magnetic pick-up probes displaying a ballooning character and n = +1 toroidal mode number. This oscillation could help explain the markedly different pedestal dynamics observed in the small-ELM regime. [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:
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      – Type: doi
        Value: 10.1088/1361-6587/ac0797
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 1
    Subjects:
      – SubjectFull: Reflectometry
        Type: general
      – SubjectFull: Pedestals
        Type: general
      – SubjectFull: Density
        Type: general
      – SubjectFull: Tokamaks
        Type: general
      – SubjectFull: Fusion reactors
        Type: general
      – SubjectFull: Edges (Geometry)
        Type: general
      – SubjectFull: Reflectometer
        Type: general
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      – TitleFull: High resolution density pedestal measurements during edge localized modes by short-pulse reflectometry in the TCV tokamak.
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            NameFull: Cabrera, P A Molina
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              M: 08
              Text: Aug2021
              Type: published
              Y: 2021
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