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Fluctuation characteristics of the TCV snowflake divertor measured with high speed visible imaging.

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Title: Fluctuation characteristics of the TCV snowflake divertor measured with high speed visible imaging.
Authors: N R Walkden1 nick.walkden@ukaea.uk, B Labit2, H Reimerdes2, J Harrison1, T Farley1,3, P Innocente4, F Militello1, Team, the T. C. V.5, Team, the MST16
Source: Plasma Physics & Controlled Fusion. Nov2018, Vol. 60 Issue 11, p1-1. 1p.
Subjects: Fusion reactor divertors, Fluctuations (Physics), Cameras, Imaging systems, Magnetic flux
Abstract: Tangentially viewing fast camera footage of the low-field side snowflake minus divertor in TCV is analysed across a four-point scan in which the proximity of the two X-points is varied systematically. The motion of structures observed in the post-processed movie shows two distinct regions of the camera frame exhibiting differing patterns. One type of motion in the outer scrape-off layer remains present throughout the scan whilst the other, apparent in the inner scrape-off layer between the two nulls, becomes increasingly significant as the X-points contract towards one another. The spatial structure of the fluctuations in both regions is shown to conform to the equilibrium magnetic field. When the X-point gap is wide the fluctuations measured in the region between the X-points show a similar structure to the fluctuations observed above the null region, remaining coherent for multiple toroidal turns of the magnetic field and indicating a physical connectivity of the fluctuations between the upstream and downstream regions. When the X-point gap is small the fluctuations in the inner scrape-off layer between the nulls are decorrelated from fluctuations upstream, indicating local production of filamentary structures. The motion of filaments in the inter-null region differs, with filaments showing a dominantly poloidal motion along magnetic flux surfaces when the X-point gap is large, compared to a dominantly radial motion across flux-surfaces when the gap is small. This demonstrates an enhancement to cross-field transport between the nulls of the TCV low-field-side snowflake minus when the gap between the nulls is small. [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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  Data: Fluctuation characteristics of the TCV snowflake divertor measured with high speed visible imaging.
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  Data: <searchLink fieldCode="AR" term="%22N+R+Walkden%22">N R Walkden</searchLink><relatesTo>1</relatesTo><i> nick.walkden@ukaea.uk</i><br /><searchLink fieldCode="AR" term="%22B+Labit%22">B Labit</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22H+Reimerdes%22">H Reimerdes</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22J+Harrison%22">J Harrison</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22T+Farley%22">T Farley</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22P+Innocente%22">P Innocente</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22F+Militello%22">F Militello</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Team%2C+the+T%2E+C%2E+V%2E%22">Team, the T. C. V.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Team%2C+the+MST1%22">Team, the MST1</searchLink><relatesTo>6</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Plasma+Physics+%26+Controlled+Fusion%22">Plasma Physics & Controlled Fusion</searchLink>. Nov2018, Vol. 60 Issue 11, p1-1. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Fusion+reactor+divertors%22">Fusion reactor divertors</searchLink><br /><searchLink fieldCode="DE" term="%22Fluctuations+%28Physics%29%22">Fluctuations (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Cameras%22">Cameras</searchLink><br /><searchLink fieldCode="DE" term="%22Imaging+systems%22">Imaging systems</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+flux%22">Magnetic flux</searchLink>
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  Data: Tangentially viewing fast camera footage of the low-field side snowflake minus divertor in TCV is analysed across a four-point scan in which the proximity of the two X-points is varied systematically. The motion of structures observed in the post-processed movie shows two distinct regions of the camera frame exhibiting differing patterns. One type of motion in the outer scrape-off layer remains present throughout the scan whilst the other, apparent in the inner scrape-off layer between the two nulls, becomes increasingly significant as the X-points contract towards one another. The spatial structure of the fluctuations in both regions is shown to conform to the equilibrium magnetic field. When the X-point gap is wide the fluctuations measured in the region between the X-points show a similar structure to the fluctuations observed above the null region, remaining coherent for multiple toroidal turns of the magnetic field and indicating a physical connectivity of the fluctuations between the upstream and downstream regions. When the X-point gap is small the fluctuations in the inner scrape-off layer between the nulls are decorrelated from fluctuations upstream, indicating local production of filamentary structures. The motion of filaments in the inter-null region differs, with filaments showing a dominantly poloidal motion along magnetic flux surfaces when the X-point gap is large, compared to a dominantly radial motion across flux-surfaces when the gap is small. This demonstrates an enhancement to cross-field transport between the nulls of the TCV low-field-side snowflake minus when the gap between the nulls is small. [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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        Value: 10.1088/1361-6587/aae005
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              Text: Nov2018
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