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The effect of L mode filaments on divertor heat flux profiles as measured by infrared thermography on MAST.

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Title: The effect of L mode filaments on divertor heat flux profiles as measured by infrared thermography on MAST.
Authors: A J Thornton1 andrew.thornton@ccfe.ac.uk, G Fishpool1, A Kirk1, Team, the MAST1, Team, the EUROfusion MST12
Source: Plasma Physics & Controlled Fusion. Nov2015, Vol. 57 Issue 11, p1-1. 1p.
Subjects: Thermography, Magnetic fields, L-mode plasma confinement, Heat flux, Diverters (Electronics)
Abstract: Filamentary transport across the scrape off layer is a key issue for the design and operation of future devices, such as ITER, DEMO and MAST-U, as it sets the power loadings to the divertor and first wall of the machine. Analysis has been performed on L mode filaments in MAST in order to gain an understanding of the spatial structure and attempt to reconcile the different scales of the filament width and the power fall off length (). The L mode filament heat flux arriving at the divertor has been measured using high spatial resolution (1.5 mm) infrared (IR) thermography. The filaments form discrete spiral patterns at the divertor which can be seen as bands of increased heat flux in the IR measurements. Analysis of the width and spacing of these bands at the divertor has allowed the toroidal mode number of the filaments to be determined (). The size of the filaments at the midplane has been determined using the target filament radial width and the magnetic field geometry. The filament width perpendicular to the magnetic field at the midplane has been found to be between 3 and 5 cm. Direct calculation of the filament width from midplane visible imaging gives a range of 4–6 cm which agrees well with the IR data. [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: The effect of L mode filaments on divertor heat flux profiles as measured by infrared thermography on MAST.
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  Data: <searchLink fieldCode="AR" term="%22A+J+Thornton%22">A J Thornton</searchLink><relatesTo>1</relatesTo><i> andrew.thornton@ccfe.ac.uk</i><br /><searchLink fieldCode="AR" term="%22G+Fishpool%22">G Fishpool</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22A+Kirk%22">A Kirk</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Team%2C+the+MAST%22">Team, the MAST</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Team%2C+the+EUROfusion+MST1%22">Team, the EUROfusion MST1</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="DE" term="%22Thermography%22">Thermography</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22L-mode+plasma+confinement%22">L-mode plasma confinement</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+flux%22">Heat flux</searchLink><br /><searchLink fieldCode="DE" term="%22Diverters+%28Electronics%29%22">Diverters (Electronics)</searchLink>
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  Data: Filamentary transport across the scrape off layer is a key issue for the design and operation of future devices, such as ITER, DEMO and MAST-U, as it sets the power loadings to the divertor and first wall of the machine. Analysis has been performed on L mode filaments in MAST in order to gain an understanding of the spatial structure and attempt to reconcile the different scales of the filament width and the power fall off length (). The L mode filament heat flux arriving at the divertor has been measured using high spatial resolution (1.5 mm) infrared (IR) thermography. The filaments form discrete spiral patterns at the divertor which can be seen as bands of increased heat flux in the IR measurements. Analysis of the width and spacing of these bands at the divertor has allowed the toroidal mode number of the filaments to be determined (). The size of the filaments at the midplane has been determined using the target filament radial width and the magnetic field geometry. The filament width perpendicular to the magnetic field at the midplane has been found to be between 3 and 5 cm. Direct calculation of the filament width from midplane visible imaging gives a range of 4–6 cm which agrees well with the IR data. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  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: 10.1088/0741-3335/57/11/115010
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      – SubjectFull: Magnetic fields
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      – SubjectFull: L-mode plasma confinement
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      – SubjectFull: Heat flux
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      – SubjectFull: Diverters (Electronics)
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