Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod
Reversed shear Alfvén eigenmodes (RSAEs) have been observed with the phase contrast imaging diagnostic and Mirnov coils during the sawtooth cycle in Alcator C-mod [M. Greenwald et al., Nucl. Fusion 45, S109 (2005)] plasmas with minority ion-cyclotron resonance heating. Both down-chirping RSAEs and u...
| Main Authors: | , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Institute of Physics
2010
|
| Online Access: | http://hdl.handle.net/1721.1/51797 https://orcid.org/0000-0002-9518-4097 |
| _version_ | 1826197912766382080 |
|---|---|
| author | Edlund, Eric Matthias Porkolab, Miklos Kramer, G. J. Lin, Liang Lin, Yijun Wukitch, Stephen James |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Edlund, Eric Matthias Porkolab, Miklos Kramer, G. J. Lin, Liang Lin, Yijun Wukitch, Stephen James |
| author_sort | Edlund, Eric Matthias |
| collection | MIT |
| description | Reversed shear Alfvén eigenmodes (RSAEs) have been observed with the phase contrast imaging diagnostic and Mirnov coils during the sawtooth cycle in Alcator C-mod [M. Greenwald et al., Nucl. Fusion 45, S109 (2005)] plasmas with minority ion-cyclotron resonance heating. Both down-chirping RSAEs and up-chirping RSAEs have been observed during the sawtooth cycle. Experimental measurements of the spatial structure of the RSAEs are compared to theoretical models based on the code NOVA [C. Z. Cheng and M. S. Chance, J. Comput. Phys. 71, 124 (1987)] and used to derive constraints on the q profile. It is shown that the observed RSAEs can be understood by assuming a reversed shear q profile (up chirping) or a q profile with a local maximum (down chirping) with q[approximate]1. |
| first_indexed | 2024-09-23T10:55:33Z |
| format | Article |
| id | mit-1721.1/51797 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:55:33Z |
| publishDate | 2010 |
| publisher | American Institute of Physics |
| record_format | dspace |
| spelling | mit-1721.1/517972022-09-30T23:57:03Z Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod Edlund, Eric Matthias Porkolab, Miklos Kramer, G. J. Lin, Liang Lin, Yijun Wukitch, Stephen James Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Porkolab, Miklos Edlund, Eric Matthias Porkolab, Miklos Lin, Liang Lin, Yijun Wukitch, Stephen James Reversed shear Alfvén eigenmodes (RSAEs) have been observed with the phase contrast imaging diagnostic and Mirnov coils during the sawtooth cycle in Alcator C-mod [M. Greenwald et al., Nucl. Fusion 45, S109 (2005)] plasmas with minority ion-cyclotron resonance heating. Both down-chirping RSAEs and up-chirping RSAEs have been observed during the sawtooth cycle. Experimental measurements of the spatial structure of the RSAEs are compared to theoretical models based on the code NOVA [C. Z. Cheng and M. S. Chance, J. Comput. Phys. 71, 124 (1987)] and used to derive constraints on the q profile. It is shown that the observed RSAEs can be understood by assuming a reversed shear q profile (up chirping) or a q profile with a local maximum (down chirping) with q[approximate]1. U.S. Department of Energy 2010-02-23T20:56:40Z 2010-02-23T20:56:40Z 2009-03 2008-12 Article http://purl.org/eprint/type/JournalArticle 1070-664X http://hdl.handle.net/1721.1/51797 Edlund, E. M. et al. “Phase contrast imaging measurements of reversed shear Alfv[e-acute]n eigenmodes during sawteeth in Alcator C-Mod.” Physics of Plasmas 16.5 (2009): 056106-8. ©2009 American Institute of Physics. https://orcid.org/0000-0002-9518-4097 en_US http://dx.doi.org/10.1063/1.3086869 Physics of Plasmas Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Institute of Physics Carol Arlington |
| spellingShingle | Edlund, Eric Matthias Porkolab, Miklos Kramer, G. J. Lin, Liang Lin, Yijun Wukitch, Stephen James Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod |
| title | Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod |
| title_full | Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod |
| title_fullStr | Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod |
| title_full_unstemmed | Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod |
| title_short | Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod |
| title_sort | phase contrast imaging measurements of reversed shear alfven eigenmodes during sawteeth in alcator c mod |
| url | http://hdl.handle.net/1721.1/51797 https://orcid.org/0000-0002-9518-4097 |
| work_keys_str_mv | AT edlundericmatthias phasecontrastimagingmeasurementsofreversedshearalfveneigenmodesduringsawteethinalcatorcmod AT porkolabmiklos phasecontrastimagingmeasurementsofreversedshearalfveneigenmodesduringsawteethinalcatorcmod AT kramergj phasecontrastimagingmeasurementsofreversedshearalfveneigenmodesduringsawteethinalcatorcmod AT linliang phasecontrastimagingmeasurementsofreversedshearalfveneigenmodesduringsawteethinalcatorcmod AT linyijun phasecontrastimagingmeasurementsofreversedshearalfveneigenmodesduringsawteethinalcatorcmod AT wukitchstephenjames phasecontrastimagingmeasurementsofreversedshearalfveneigenmodesduringsawteethinalcatorcmod |