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Understanding and suppressing the near scrape-off layer heat flux feature in inboard-limited plasmas in TCV.

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Title: Understanding and suppressing the near scrape-off layer heat flux feature in inboard-limited plasmas in TCV.
Authors: F. Nespoli1 nespolifederico@gmail.com, B. Labit1, I. Furno1, J. Horacek2, C.K. Tsui1,3, J.A. Boedo3, R. Maurizio1, H. Reimerdes1, C. Theiler1, P. Ricci1, F.D. Halpern1,4, U. Sheikh1, K. Verhaegh1, R.A. Pitts5, F. Militello6, Team, The EUROfusion MST17, Team, The T. C. V.8
Source: Nuclear Fusion. Dec2017, Vol. 57 Issue 12, p1-1. 1p.
Subjects: Plasma transport processes, Heat flux, Deuterium plasma, Plasma density, Langmuir probes
Abstract: In inboard-limited plasmas, the scrape-off layer (SOL) shows two regions: the near SOL, extending a few mm from the last closed flux surface (LCFS), characterized by a steep gradient of the parallel heat flux radial profile, and a far SOL, typically some cm wide, with flatter heat flux profiles. The physics of the near SOL is investigated in TCV with two series of experiments featuring deuterium and helium plasmas, in which the plasma current, density and elongation have been varied. The parallel heat flux profiles are measured on the limiter by means of infrared thermography. For the first time, the near SOL is reported to disappear for low plasma current or at high density, for values of the SOL collisionality corresponding to a conduction-limited regime. The power in the near SOL is shown to decrease with the normalized Spitzer resistivity ν as . The floating potential profiles, measured at the limiter using flush-mounted Langmuir probes (LP), show the presence of non-ambipolar currents, and their relation to the presence of a velocity shear layer is discussed. The shearing rate is shown to strictly correlate with the power in the near SOL , consistently with a recent theoretical model. Measurements of the near SOL on the Low Field Side (LFS) are performed using a reciprocating Langmuir probe (RP). The near SOL is reported to vanish simultaneously at the LFS and at the limiter. The near and far SOL widths are compared with the predictions from existing theoretical models, to which empirical corrections with resistivity and elongation are proposed. [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.)
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An: 126199444
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  Data: Understanding and suppressing the near scrape-off layer heat flux feature in inboard-limited plasmas in TCV.
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  Data: <searchLink fieldCode="AR" term="%22F%2E+Nespoli%22">F. Nespoli</searchLink><relatesTo>1</relatesTo><i> nespolifederico@gmail.com</i><br /><searchLink fieldCode="AR" term="%22B%2E+Labit%22">B. Labit</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22I%2E+Furno%22">I. Furno</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22J%2E+Horacek%22">J. Horacek</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22C%2EK%2E+Tsui%22">C.K. Tsui</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22J%2EA%2E+Boedo%22">J.A. Boedo</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22R%2E+Maurizio%22">R. Maurizio</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+Theiler%22">C. Theiler</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22P%2E+Ricci%22">P. Ricci</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22F%2ED%2E+Halpern%22">F.D. Halpern</searchLink><relatesTo>1,4</relatesTo><br /><searchLink fieldCode="AR" term="%22U%2E+Sheikh%22">U. Sheikh</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22K%2E+Verhaegh%22">K. Verhaegh</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22R%2EA%2E+Pitts%22">R.A. Pitts</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22F%2E+Militello%22">F. Militello</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Team%2C+The+EUROfusion+MST1%22">Team, The EUROfusion MST1</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Team%2C+The+T%2E+C%2E+V%2E%22">Team, The T. C. V.</searchLink><relatesTo>8</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Fusion%22">Nuclear Fusion</searchLink>. Dec2017, Vol. 57 Issue 12, p1-1. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Plasma+transport+processes%22">Plasma transport processes</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+flux%22">Heat flux</searchLink><br /><searchLink fieldCode="DE" term="%22Deuterium+plasma%22">Deuterium plasma</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+density%22">Plasma density</searchLink><br /><searchLink fieldCode="DE" term="%22Langmuir+probes%22">Langmuir probes</searchLink>
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  Label: Abstract
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  Data: In inboard-limited plasmas, the scrape-off layer (SOL) shows two regions: the near SOL, extending a few mm from the last closed flux surface (LCFS), characterized by a steep gradient of the parallel heat flux radial profile, and a far SOL, typically some cm wide, with flatter heat flux profiles. The physics of the near SOL is investigated in TCV with two series of experiments featuring deuterium and helium plasmas, in which the plasma current, density and elongation have been varied. The parallel heat flux profiles are measured on the limiter by means of infrared thermography. For the first time, the near SOL is reported to disappear for low plasma current or at high density, for values of the SOL collisionality corresponding to a conduction-limited regime. The power in the near SOL is shown to decrease with the normalized Spitzer resistivity ν as . The floating potential profiles, measured at the limiter using flush-mounted Langmuir probes (LP), show the presence of non-ambipolar currents, and their relation to the presence of a velocity shear layer is discussed. The shearing rate is shown to strictly correlate with the power in the near SOL , consistently with a recent theoretical model. Measurements of the near SOL on the Low Field Side (LFS) are performed using a reciprocating Langmuir probe (RP). The near SOL is reported to vanish simultaneously at the LFS and at the limiter. The near and far SOL widths are compared with the predictions from existing theoretical models, to which empirical corrections with resistivity and elongation are proposed. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  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.)
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        Value: 10.1088/1741-4326/aa84e0
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        Text: English
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      – SubjectFull: Deuterium plasma
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