New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak
A novel multichannel, tunable Doppler backscattering (DBS)/reflectometry system has recently been developed and applied to a variety of DIII-D plasmas. Either DBS or reflectometry can be easily configured for use in a wide range of plasma conditions using a flexible quasi-optical antenna system. The...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | en_US |
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2011
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| Online Access: | http://hdl.handle.net/1721.1/66122 https://orcid.org/0000-0003-2951-9749 |
| _version_ | 1826205895452786688 |
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| author | Hillesheim, J. C. Peebles, W. A. Rhodes, T. L. Schmitz, L. White, Anne E. |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Hillesheim, J. C. Peebles, W. A. Rhodes, T. L. Schmitz, L. White, Anne E. |
| author_sort | Hillesheim, J. C. |
| collection | MIT |
| description | A novel multichannel, tunable Doppler backscattering (DBS)/reflectometry system has recently been developed and applied to a variety of DIII-D plasmas. Either DBS or reflectometry can be easily configured for use in a wide range of plasma conditions using a flexible quasi-optical antenna system. The multiple closely spaced channels, when combined with other fluctuation diagnostic systems, have opened up new measurements of plasma properties. For example, the toroidal and fine-scale radial structure of coherent plasma oscillations, such as geodesic acoustic modes, have been probed simultaneously in the core of high temperature plasmas by applying correlation analysis between two toroidally separated DBS systems, as well as within the multichannel array. When configured as a reflectometer, cross-correlation with electron cyclotron emission radiometry has uncovered detailed information regarding the crossphase relationship between density and temperature fluctuations. The density-temperature crossphase measurement yields insight into the physics of tokamak turbulence at a fundamental level that can be directly compared with predictions from nonlinear gyrokinetic simulations. |
| first_indexed | 2024-09-23T13:20:44Z |
| format | Article |
| id | mit-1721.1/66122 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:20:44Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | mit-1721.1/661222022-09-28T13:32:53Z New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak Hillesheim, J. C. Peebles, W. A. Rhodes, T. L. Schmitz, L. White, Anne E. Massachusetts Institute of Technology. Department of Nuclear Science and Engineering White, Anne E. White, Anne E. A novel multichannel, tunable Doppler backscattering (DBS)/reflectometry system has recently been developed and applied to a variety of DIII-D plasmas. Either DBS or reflectometry can be easily configured for use in a wide range of plasma conditions using a flexible quasi-optical antenna system. The multiple closely spaced channels, when combined with other fluctuation diagnostic systems, have opened up new measurements of plasma properties. For example, the toroidal and fine-scale radial structure of coherent plasma oscillations, such as geodesic acoustic modes, have been probed simultaneously in the core of high temperature plasmas by applying correlation analysis between two toroidally separated DBS systems, as well as within the multichannel array. When configured as a reflectometer, cross-correlation with electron cyclotron emission radiometry has uncovered detailed information regarding the crossphase relationship between density and temperature fluctuations. The density-temperature crossphase measurement yields insight into the physics of tokamak turbulence at a fundamental level that can be directly compared with predictions from nonlinear gyrokinetic simulations. United States. Dept. of Energy (Grant no. DE-FG02-08ER54984) United States. Dept. of Energy (Grant no. DE-FG03-01ER54615) United States. Dept. of Energy (Contract no. DE-FC02-04ER54698) 2011-09-29T21:47:29Z 2011-09-29T21:47:29Z 2010-10 2010-05 Article http://purl.org/eprint/type/ConferencePaper 0034-6748 http://hdl.handle.net/1721.1/66122 Hillesheim, J. C. et al. “New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak (invited).” Review of Scientific Instruments 81 (2010): 10D907. © 2010 American Institute of Physics https://orcid.org/0000-0003-2951-9749 en_US http://dx.doi.org/10.1063/1.3466900 Review of Scientific Instruments 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 AIP |
| spellingShingle | Hillesheim, J. C. Peebles, W. A. Rhodes, T. L. Schmitz, L. White, Anne E. New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak |
| title | New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak |
| title_full | New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak |
| title_fullStr | New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak |
| title_full_unstemmed | New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak |
| title_short | New plasma measurements with a multichannel millimeter-wave fluctuation diagnostic system in the DIII-D tokamak |
| title_sort | new plasma measurements with a multichannel millimeter wave fluctuation diagnostic system in the diii d tokamak |
| url | http://hdl.handle.net/1721.1/66122 https://orcid.org/0000-0003-2951-9749 |
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