Explaining the lack of power degradation of energy confinement in wide pedestal quiescent H-modes via transport modeling

Saeid Houshmandyar; K. H. Burrell; B. A. Grierson; J. McClenaghan; G. M. Staebler; C. Chrystal; M. R. Halfmoon; D. R. Hatch; L. Zeng; M. E. Austin

doi:10.1088/1741-4326/ac583b

Explaining the lack of power degradation of energy confinement in wide pedestal quiescent H-modes via transport modeling

Saeid Houshmandyar, K. H. Burrell, B. A. Grierson, J. McClenaghan, G. M. Staebler, C. Chrystal, M. R. Halfmoon, D. R. Hatch, L. Zeng, M. E. Austin

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6 Scopus citations

Abstract

Wide pedestal quiescent H (WPQH)-mode is an attractive scenario for future burning plasmas as they operate without ELMs. WPQH is characterized by formation of a wider and higher pedestal (than quiescent H-mode), and broadband fluctuations in the pedestal. Unlike conventional H-modes, where the energy confinement time reduces with increasing heating power, the WPQH plasmas reported in this paper do not show power degradation of the energy confinement.

Original language	English
Article number	056024
Journal	Nuclear Fusion
Volume	62
Issue number	5
DOIs	https://doi.org/10.1088/1741-4326/ac583b
State	Published - May 2022
Externally published	Yes

Funding

The material is based upon work supported in part by the US Department of Energy, Office of Fusion Energy Sciences (DOE-OFES), using DIII-D National Fusion Facility, a DOE-OFES user facility, under Awards DE-FG02-97ER54415, DE-FC02-04ER54698 and DE-SC0010500. The data analysis including profiles, transp calculations, tgyro and tglf modeling were performed using OMFIT integrated modeling framework [].

Keywords

ELM-free
TGLF
energy confinement time
transport modeling
wide pedestal quiescent H mode

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10.1088/1741-4326/ac583b

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abstract = "Wide pedestal quiescent H (WPQH)-mode is an attractive scenario for future burning plasmas as they operate without ELMs. WPQH is characterized by formation of a wider and higher pedestal (than quiescent H-mode), and broadband fluctuations in the pedestal. Unlike conventional H-modes, where the energy confinement time reduces with increasing heating power, the WPQH plasmas reported in this paper do not show power degradation of the energy confinement.",

keywords = "ELM-free, TGLF, energy confinement time, transport modeling, wide pedestal quiescent H mode",

author = "Saeid Houshmandyar and Burrell, {K. H.} and Grierson, {B. A.} and J. McClenaghan and Staebler, {G. M.} and C. Chrystal and Halfmoon, {M. R.} and Hatch, {D. R.} and L. Zeng and Austin, {M. E.}",

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language = "English",

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T1 - Explaining the lack of power degradation of energy confinement in wide pedestal quiescent H-modes via transport modeling

AU - Houshmandyar, Saeid

AU - Burrell, K. H.

AU - Grierson, B. A.

AU - McClenaghan, J.

AU - Staebler, G. M.

AU - Chrystal, C.

AU - Halfmoon, M. R.

AU - Hatch, D. R.

AU - Zeng, L.

AU - Austin, M. E.

PY - 2022/5

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N2 - Wide pedestal quiescent H (WPQH)-mode is an attractive scenario for future burning plasmas as they operate without ELMs. WPQH is characterized by formation of a wider and higher pedestal (than quiescent H-mode), and broadband fluctuations in the pedestal. Unlike conventional H-modes, where the energy confinement time reduces with increasing heating power, the WPQH plasmas reported in this paper do not show power degradation of the energy confinement.

AB - Wide pedestal quiescent H (WPQH)-mode is an attractive scenario for future burning plasmas as they operate without ELMs. WPQH is characterized by formation of a wider and higher pedestal (than quiescent H-mode), and broadband fluctuations in the pedestal. Unlike conventional H-modes, where the energy confinement time reduces with increasing heating power, the WPQH plasmas reported in this paper do not show power degradation of the energy confinement.

KW - ELM-free

KW - TGLF

KW - energy confinement time

KW - transport modeling

KW - wide pedestal quiescent H mode

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ER -

Explaining the lack of power degradation of energy confinement in wide pedestal quiescent H-modes via transport modeling

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Keywords

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