|
View: |
Part 1: Document Description
|
|
Citation |
|
|---|---|
|
Title: |
Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions |
|
Identification Number: |
doi:10.7910/DVN/WT1XGR |
|
Distributor: |
Harvard Dataverse |
|
Date of Distribution: |
2018-05-17 |
|
Version: |
1 |
|
Bibliographic Citation: |
I. Cziegler, A. E. Hubbard, J.W. Hughes, J. L. Terry, G. R. Tynan, 2018, "Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions", https://doi.org/10.7910/DVN/WT1XGR, Harvard Dataverse, V1 |
|
Citation |
|
|
Title: |
Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions |
|
Identification Number: |
doi:10.7910/DVN/WT1XGR |
|
Authoring Entity: |
I. Cziegler, A. E. Hubbard, J.W. Hughes, J. L. Terry, G. R. Tynan |
|
Distributor: |
Harvard Dataverse |
|
Holdings Information: |
https://doi.org/10.7910/DVN/WT1XGR |
|
Study Scope |
|
|
Keywords: |
Physics, confinement, edge transport barrier, edge turbulence, H-modes, I-mode, nonlinear effects |
|
Abstract: |
A comprehensive study of fully frequency-resolved nonlinear kinetic energy transfer has been performed for the first time in a diverted tokamak, providing new insight into the parametric dependences of edge turbulence transitions. Measurements using gas puff imaging in the turbulent L-mode state illuminate the source of the long known but as yet unexplained “favorable-unfavorable” geometric asymmetry of the power threshold for transition to the turbulence-suppressed H mode. Results from the recently discovered I mode point to a competition between zonal flow (ZF) and geodesic-acoustic modes (GAM) for turbulent energy, while showing new evidence that the I-to-H transition is still dominated by ZFs. The availability of nonlinear drive for the GAM against net heat flux through the edge corresponds very well to empirical scalings found experimentally for accessing the I mode. |
|
Notes: |
<a href="http://library.psfc.mit.edu/catalog/reports/2010/16ja/16ja055/16ja055_abs.html">PSFC REPORT PSFC/JA-16-55</a><br /><br />This work was performed in partial funding by U.S. Department of Energy, Contract Nos. DE-SC-0008689 and DE-FC02-99ER54512 |
|
Methodology and Processing |
|
|
Sources Statement |
|
|
Data Access |
|
|
Notes: |
This dataset is made available without information on how it can be used. You should communicate with the Contact(s) specified before use. |
|
Other Study Description Materials |
|
|
Label: |
archival_16ja055_full.pdf |
|
Text: | |
|
Notes: |
application/pdf |