Dependence of intrinsic torque and momentum confinement on normalized gyroradius and collisionality in the DIII-D tokamak
Abstract
The dependence of intrinsic torque and momentum confinement time on normalized gyroradius ( ) and collisionality ( ) have been measured in the DIII-D tokamak. Intrinsic torque normalized to temperature is found to have and dependencies of 1:5 0:8 and 0:26 0:04 . This dependence on is unexpectedly favorable (increasing as decreases). The choice of normalization is important and the implications are discussed. The unexpected dependence on is found to be robust, despite some uncertainty in the choice of normalization. The dependence of momentum confinement on does not clearly demonstrate Bohm or gyro-Bohm like scaling, and a weaker dependence on is found. The calculations required to use these dependencies to determine the intrinsic torqe in a future tokamak like ITER are presentend, and the importance of the normalization explained. Based on currently available information, the intrinsic torque predicted for ITER is 33 N m, comprable 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.
- Authors:
-
[1];
[1];
[1]
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- 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); 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. https://doi.org/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. https://doi.org/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 = {The dependence of intrinsic torque and momentum confinement time on normalized gyroradius ( ) and collisionality ( ) have been measured in the DIII-D tokamak. Intrinsic torque normalized to temperature is found to have and dependencies of 1:5 0:8 and 0:26 0:04 . This dependence on is unexpectedly favorable (increasing as decreases). The choice of normalization is important and the implications are discussed. The unexpected dependence on is found to be robust, despite some uncertainty in the choice of normalization. The dependence of momentum confinement on does not clearly demonstrate Bohm or gyro-Bohm like scaling, and a weaker dependence on is found. The calculations required to use these dependencies to determine the intrinsic torqe in a future tokamak like ITER are presentend, and the importance of the normalization explained. Based on currently available information, the intrinsic torque predicted for ITER is 33 N m, comprable 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.},
doi = {10.1063/1.4978563},
journal = {Physics of Plasmas},
number = 4,
volume = 24,
place = {United States},
year = {Wed Mar 29 00:00:00 EDT 2017},
month = {Wed Mar 29 00:00:00 EDT 2017}
}
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