Dimensionless parameter scaling of intrinsic torque in C-Mod enhanced confinement plasmas

J. E. Rice; N. M. Cao; Tuomas Tala; C. Chrystal; M. J. Greenwald; J. W. Hughes; E. S. Marmar; M. L. Reinke; P. Rodriguez Fernandez; Antti Salmi

doi:10.1088/1741-4326/abcb26

Dimensionless parameter scaling of intrinsic torque in C-Mod enhanced confinement plasmas

J. E. Rice^*
, N. M. Cao
, Tuomas Tala
, C. Chrystal
, M. J. Greenwald
, J. W. Hughes
, E. S. Marmar
, M. L. Reinke
, P. Rodriguez Fernandez
, Antti Salmi

^*Corresponding author for this work

MIT Massachusetts Institute of Technology
General Atomics
Oak Ridge National Laboratory (ORNL)

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

13 Citations (Scopus)

Abstract

A dimensionless parameter dependence study of intrinsic torque has been performed on a database of H- and I-mode plasmas from the Alcator C-Mod tokamak. The torque was determined by comparing intrinsic angular momentum density profiles just before and just after L-H and L-I transitions. The intrinsic torque has been found to scale as β^1.5_N_ρ∗^-1.0ν_∗^0.1, with the parameter ranges 0.3 ≤ β_N≤ 1.5, 0.004 ≤_ρ∗≤ 0.011 and 0.04 ≤ ν_∗≤ 0.9. Comparison with results from JET and DIII-D suggests that the intrinsic torque should be normalized by some measure of the device size. Depending upon this normalization, the estimated total intrinsic torques for ITER, SPARC and ARC are ~20, ~4 and ~8 Nm, respectively.

Original language	English
Article number	026013
Journal	Nuclear Fusion
Volume	61
Issue number	2
DOIs	https://doi.org/10.1088/1741-4326/abcb26
Publication status	Published - Feb 2021
MoE publication type	A1 Journal article-refereed

Funding

Work supported at MIT by DoE Award DE-SC0014264. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award DE-FC02-04ER54698. This work has been partially 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.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

H-mode
I-mode
Intrinsic torque
Tokamak

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10.1088/1741-4326/abcb26

Cite this

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title = "Dimensionless parameter scaling of intrinsic torque in C-Mod enhanced confinement plasmas",

abstract = "A dimensionless parameter dependence study of intrinsic torque has been performed on a database of H- and I-mode plasmas from the Alcator C-Mod tokamak. The torque was determined by comparing intrinsic angular momentum density profiles just before and just after L-H and L-I transitions. The intrinsic torque has been found to scale as β1.5Nρ∗-1.0ν∗0.1, with the parameter ranges 0.3 ≤ βN≤ 1.5, 0.004 ≤ρ∗≤ 0.011 and 0.04 ≤ ν∗≤ 0.9. Comparison with results from JET and DIII-D suggests that the intrinsic torque should be normalized by some measure of the device size. Depending upon this normalization, the estimated total intrinsic torques for ITER, SPARC and ARC are \textasciitilde{}20, \textasciitilde{}4 and \textasciitilde{}8 Nm, respectively.",

keywords = "H-mode, I-mode, Intrinsic torque, Tokamak",

author = "Rice, \{J. E.\} and Cao, \{N. M.\} and Tuomas Tala and C. Chrystal and Greenwald, \{M. J.\} and Hughes, \{J. W.\} and Marmar, \{E. S.\} and Reinke, \{M. L.\} and Fernandez, \{P. Rodriguez\} and Antti Salmi",

year = "2021",

month = feb,

doi = "10.1088/1741-4326/abcb26",

language = "English",

volume = "61",

journal = "Nuclear Fusion",

issn = "0029-5515",

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TY - JOUR

T1 - Dimensionless parameter scaling of intrinsic torque in C-Mod enhanced confinement plasmas

AU - Rice, J. E.

AU - Cao, N. M.

AU - Tala, Tuomas

AU - Chrystal, C.

AU - Greenwald, M. J.

AU - Hughes, J. W.

AU - Marmar, E. S.

AU - Reinke, M. L.

AU - Fernandez, P. Rodriguez

AU - Salmi, Antti

PY - 2021/2

Y1 - 2021/2

N2 - A dimensionless parameter dependence study of intrinsic torque has been performed on a database of H- and I-mode plasmas from the Alcator C-Mod tokamak. The torque was determined by comparing intrinsic angular momentum density profiles just before and just after L-H and L-I transitions. The intrinsic torque has been found to scale as β1.5Nρ∗-1.0ν∗0.1, with the parameter ranges 0.3 ≤ βN≤ 1.5, 0.004 ≤ρ∗≤ 0.011 and 0.04 ≤ ν∗≤ 0.9. Comparison with results from JET and DIII-D suggests that the intrinsic torque should be normalized by some measure of the device size. Depending upon this normalization, the estimated total intrinsic torques for ITER, SPARC and ARC are ~20, ~4 and ~8 Nm, respectively.

AB - A dimensionless parameter dependence study of intrinsic torque has been performed on a database of H- and I-mode plasmas from the Alcator C-Mod tokamak. The torque was determined by comparing intrinsic angular momentum density profiles just before and just after L-H and L-I transitions. The intrinsic torque has been found to scale as β1.5Nρ∗-1.0ν∗0.1, with the parameter ranges 0.3 ≤ βN≤ 1.5, 0.004 ≤ρ∗≤ 0.011 and 0.04 ≤ ν∗≤ 0.9. Comparison with results from JET and DIII-D suggests that the intrinsic torque should be normalized by some measure of the device size. Depending upon this normalization, the estimated total intrinsic torques for ITER, SPARC and ARC are ~20, ~4 and ~8 Nm, respectively.

KW - H-mode

KW - I-mode

KW - Intrinsic torque

KW - Tokamak

UR - https://www.scopus.com/pages/publications/85100396153

U2 - 10.1088/1741-4326/abcb26

DO - 10.1088/1741-4326/abcb26

M3 - Article

AN - SCOPUS:85100396153

SN - 0029-5515

VL - 61

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 2

M1 - 026013

ER -

Dimensionless parameter scaling of intrinsic torque in C-Mod enhanced confinement plasmas

Abstract

Funding

UN SDGs

Keywords

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