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Effect of quasihelical symmetry on trapped-electron mode transport in the HSX stellarator
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Guttenfelder, W., Lore, J., Anderson, David T., Anderson, F. S. B., Canik, J. M., Dorland, William Douglass, Likin, K. M. and Talmadge, Joseph Nathan (2008) Effect of quasihelical symmetry on trapped-electron mode transport in the HSX stellarator. Physical Review Letters, Vol.101 (No.21). doi:10.1103/PhysRevLett.101.215002
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.101.215002
Abstract
This Letter presents theory-based predictions of anomalous electron thermal transport in the Helically Symmetric eXperiment stellarator, using an axisymmetric trapped-electron mode drift wave model. The model relies on modifications to a tokamak geometry that approximate the quasihelical symmetry in the Helically Symmetric eXperiment (particle trapping and local curvature) and is supported by linear 3D gyrokinetic calculations. Transport simulations predict temperature profiles that agree with experimental profiles outside a normalized minor radius of rho > 0.3 and energy confinement times that agree within 10% of measurements. The simulations can reproduce the large measured electron temperatures inside rho < 0.3 if an approximation for turbulent transport suppression due to shear in the radial electric field is included.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Stellarators, Electron transport | ||||
| Journal or Publication Title: | Physical Review Letters | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 0031-9007 | ||||
| Official Date: | 21 November 2008 | ||||
| Dates: |
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| Volume: | Vol.101 | ||||
| Number: | No.21 | ||||
| Number of Pages: | 4 | ||||
| DOI: | 10.1103/PhysRevLett.101.215002 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | United States. Dept. of Energy | ||||
| Grant number: | DE-FG02-93ER54222 (DoE), DE-FC02-04ER54784 (DoE) |
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