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Title: Dependence of intrinsic torque and momentum confinement on normalized gyroradius and collisionality in the DIII-D tokamak

Abstract

We measured the dependence of intrinsic torque and momentum confinement time on normalized gyroradius (ρ *) and collisionality (v *) in the DIII-D tokamak. The intrinsic torque normalized to temperature is found to have ρ * and v * dependencies of ρ * -1.5 ± 0.8 and v * -0.26 ± 0.04. This dependence on ρ * is unexpectedly favorable (increasing as ρ * decreases). The choice of normalization is important, and the implications are discussed. The unexpected dependence on ρ * is found to be robust, despite some uncertainty in the choice of normalization. Furthermore, the dependence of momentum confinement on ρ * does not clearly demonstrate Bohm or gyro-Bohm like scaling, and a weaker dependence on v * is found. The calculations required to use these dependencies to determine the intrinsic torque in future tokamaks such as ITER are presented, and the importance of the normalization is explained. Based on the currently available information, the intrinsic torque predicted for ITER is 33 N m, comparable to the expected torque available from neutral beam injection. The expected average intrinsic rotation associated with this intrinsic torque is small compared to current tokamaks, but it may still aid stability and performancemore » in ITER. Published by AIP Publishing.« less

Authors:
ORCiD logo [1];  [2];  [1];  [3]; ORCiD logo [1];  [1];  [3]; ORCiD logo [1]
  1. General Atomics, San Diego, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. VTT Technical Research Centre of Finland, Espoo (Finland)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE Office of Nuclear Energy (NE)
Contributing Org.:
This material is based on the 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 Nos. DE-FC02-04ER54698 and DE-AC02-09CH11466. This work was carried out within the framework of the EUROfusion Consortium and received funding from the Euratom research and training programme 2014-2018 under Grant Agreement No. 633053. A portion of this work was conducted under the auspices of the ITPA Transport and Confinement Topical Group.
OSTI Identifier:
1358664
Alternate Identifier(s):
OSTI ID: 1373332; OSTI ID: 1374825; OSTI ID: 1405182
Grant/Contract Number:  
FC02-04ER54698; AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 4; Related Information: DIII-D data shown in this paper can be obtained in digital format at the following link https://fusion.gat.com/global/D3D_DMP.; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; charge-exchange spectroscopy; toroidal rotation; transport; plasma; jt-60u; mode; ions; ITER

Citation Formats

Chrystal, C., Grierson, B. A., Solomon, W. M., Tala, T., deGrassie, J. S., Petty, C. C., Salmi, A., and Burrell, K. H. Dependence of intrinsic torque and momentum confinement on normalized gyroradius and collisionality in the DIII-D tokamak. United States: N. p., 2017. Web. doi:10.1063/1.4978563.
Chrystal, C., Grierson, B. A., Solomon, W. M., Tala, T., deGrassie, J. S., Petty, C. C., Salmi, A., & Burrell, K. H. Dependence of intrinsic torque and momentum confinement on normalized gyroradius and collisionality in the DIII-D tokamak. United States. doi:10.1063/1.4978563.
Chrystal, C., Grierson, B. A., Solomon, W. M., Tala, T., deGrassie, J. S., Petty, C. C., Salmi, A., and Burrell, K. H. Wed . "Dependence of intrinsic torque and momentum confinement on normalized gyroradius and collisionality in the DIII-D tokamak". United States. doi:10.1063/1.4978563. https://www.osti.gov/servlets/purl/1358664.
@article{osti_1358664,
title = {Dependence of intrinsic torque and momentum confinement on normalized gyroradius and collisionality in the DIII-D tokamak},
author = {Chrystal, C. and Grierson, B. A. and Solomon, W. M. and Tala, T. and deGrassie, J. S. and Petty, C. C. and Salmi, A. and Burrell, K. H.},
abstractNote = {We measured the dependence of intrinsic torque and momentum confinement time on normalized gyroradius (ρ*) and collisionality (v*) in the DIII-D tokamak. The intrinsic torque normalized to temperature is found to have ρ* and v* dependencies of ρ*-1.5 ± 0.8 and v*-0.26 ± 0.04. This dependence on ρ* is unexpectedly favorable (increasing as ρ* decreases). The choice of normalization is important, and the implications are discussed. The unexpected dependence on ρ* is found to be robust, despite some uncertainty in the choice of normalization. Furthermore, the dependence of momentum confinement on ρ* does not clearly demonstrate Bohm or gyro-Bohm like scaling, and a weaker dependence on v* is found. The calculations required to use these dependencies to determine the intrinsic torque in future tokamaks such as ITER are presented, and the importance of the normalization is explained. Based on the currently available information, the intrinsic torque predicted for ITER is 33 N m, comparable to the expected torque available from neutral beam injection. The expected average intrinsic rotation associated with this intrinsic torque is small compared to current tokamaks, but it may still aid stability and performance in ITER. Published by AIP Publishing.},
doi = {10.1063/1.4978563},
journal = {Physics of Plasmas},
number = 4,
volume = 24,
place = {United States},
year = {2017},
month = {3}
}

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