Evidence on the effects of main-chamber neutrals on density shoulder broadening

C. K. Tsui; J. A. Boedo; D. Brida; O. Février; G. F. Harrer; A. Perek; H. Reimerdes; B. P. Duval; S. Gorno; U. A. Sheikh; C. Theiler; N. Vianello; N. Walkden; M. Wensing; M. Baquero-Ruiz

doi:10.1063/5.0090260

Evidence on the effects of main-chamber neutrals on density shoulder broadening

C. K. Tsui
, J. A. Boedo
, D. Brida
, O. Février
, G. F. Harrer
, A. Perek
, H. Reimerdes
, B. P. Duval
, S. Gorno
, U. A. Sheikh
, C. Theiler
, N. Vianello
, N. Walkden
, M. Wensing
, M. Baquero-Ruiz

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Evidence that density shoulder broadening is dependent on high main-chamber neutral density is presented. Shoulder broadening does not occur when the sources for main-chamber neutrals are minimized using divertor baffles and wide gaps to the first wall (∼3× the density decay length). Removing the baffles or reducing the gap to the inner wall both act to increase the density shoulder amplitude in otherwise identical TCV discharges. Radial turbulent transport is correlated with shoulder amplitude.

Original language	English
Article number	062507
Journal	Physics of Plasmas
Volume	29
Issue number	6
DOIs	https://doi.org/10.1063/5.0090260
State	Published - Jun 1 2022
Externally published	Yes

Funding

This work was supported by the U.S. Department of Energy under Grant No. DE-SC0010529 and by the Swiss National Science Foundation. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom Research and Training Programme 2014–2018 and 2019–2020 under Grant Agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The technical contributions of L. Chousal and C. Jones are gratefully acknowledged.

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10.1063/5.0090260

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Tsui, C. K., Boedo, J. A., Brida, D., Février, O., Harrer, G. F., Perek, A., Reimerdes, H., Duval, B. P., Gorno, S., Sheikh, U. A., Theiler, C., Vianello, N., Walkden, N., Wensing, M., & Baquero-Ruiz, M. (2022). Evidence on the effects of main-chamber neutrals on density shoulder broadening. Physics of Plasmas, 29(6), Article 062507. https://doi.org/10.1063/5.0090260

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AU - Tsui, C. K.

AU - Boedo, J. A.

AU - Brida, D.

AU - Février, O.

AU - Harrer, G. F.

AU - Perek, A.

AU - Reimerdes, H.

AU - Duval, B. P.

AU - Gorno, S.

AU - Sheikh, U. A.

AU - Theiler, C.

AU - Vianello, N.

AU - Walkden, N.

AU - Wensing, M.

AU - Baquero-Ruiz, M.

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N2 - Evidence that density shoulder broadening is dependent on high main-chamber neutral density is presented. Shoulder broadening does not occur when the sources for main-chamber neutrals are minimized using divertor baffles and wide gaps to the first wall (∼3× the density decay length). Removing the baffles or reducing the gap to the inner wall both act to increase the density shoulder amplitude in otherwise identical TCV discharges. Radial turbulent transport is correlated with shoulder amplitude.

AB - Evidence that density shoulder broadening is dependent on high main-chamber neutral density is presented. Shoulder broadening does not occur when the sources for main-chamber neutrals are minimized using divertor baffles and wide gaps to the first wall (∼3× the density decay length). Removing the baffles or reducing the gap to the inner wall both act to increase the density shoulder amplitude in otherwise identical TCV discharges. Radial turbulent transport is correlated with shoulder amplitude.

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JO - Physics of Plasmas

JF - Physics of Plasmas

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ER -

Evidence on the effects of main-chamber neutrals on density shoulder broadening

Abstract

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