Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak
The quasioptical design of a new integrated Doppler backscattering (DBS) and correlation electron cyclotron emission (CECE) system is presented. The design provides for simultaneous measurements of intermediate wavenumber density and long wavelength electron temperature turbulence behavior. The Dopp...
| Main Authors: | , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Institute of Physics
2011
|
| Online Access: | http://hdl.handle.net/1721.1/66099 https://orcid.org/0000-0003-2951-9749 |
| _version_ | 1826201754012745728 |
|---|---|
| author | Rhodes, T. L. Peebles, W. A. Nguyen, X. Hillesheim, J. C. Schmitz, L. White, Anne E. Wang, G. |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Rhodes, T. L. Peebles, W. A. Nguyen, X. Hillesheim, J. C. Schmitz, L. White, Anne E. Wang, G. |
| author_sort | Rhodes, T. L. |
| collection | MIT |
| description | The quasioptical design of a new integrated Doppler backscattering (DBS) and correlation electron cyclotron emission (CECE) system is presented. The design provides for simultaneous measurements of intermediate wavenumber density and long wavelength electron temperature turbulence behavior. The Doppler backscattering technique is sensitive to plasma turbulence flow and has been utilized to determine radial electric field, geodesic acoustic modes, zonal flows, and intermediate scale (k ∼ 1–6 cm−1 [cm superscript -1]) density turbulence. The correlation ECE system measures a second turbulent field, electron temperature fluctuations, and is sensitive to long poloidal wavelength (k ≤ 1.8 cm−1 [cm superscript -1]). The integrated system utilizes a newly installed in-vessel focusing mirror that produces a beam waist diameter of 3.5–5 cm in the plasma depending on the frequency. A single antenna (i.e., monostatic operation) is used for both launch and receive. The DBS wavenumber is selected via an adjustable launch angle and variable probing frequency. Due to the unique system design both positive and negative wavenumbers can be obtained, with a range of low to intermediate wavenumbers possible (approximately −3 to 10 cm−1 [cm superscript -1]). A unique feature of the design is the ability to place the DBS and CECE measurements at the same radial and poloidal locations allowing for cross correlation studies (e.g., measurement of nT cross-phase). |
| first_indexed | 2024-09-23T11:56:34Z |
| format | Article |
| id | mit-1721.1/66099 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:56:34Z |
| publishDate | 2011 |
| publisher | American Institute of Physics |
| record_format | dspace |
| spelling | mit-1721.1/660992022-09-27T22:58:12Z Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak Rhodes, T. L. Peebles, W. A. Nguyen, X. Hillesheim, J. C. Schmitz, L. White, Anne E. Wang, G. Massachusetts Institute of Technology. Department of Nuclear Science and Engineering White, Anne E. White, Anne E. The quasioptical design of a new integrated Doppler backscattering (DBS) and correlation electron cyclotron emission (CECE) system is presented. The design provides for simultaneous measurements of intermediate wavenumber density and long wavelength electron temperature turbulence behavior. The Doppler backscattering technique is sensitive to plasma turbulence flow and has been utilized to determine radial electric field, geodesic acoustic modes, zonal flows, and intermediate scale (k ∼ 1–6 cm−1 [cm superscript -1]) density turbulence. The correlation ECE system measures a second turbulent field, electron temperature fluctuations, and is sensitive to long poloidal wavelength (k ≤ 1.8 cm−1 [cm superscript -1]). The integrated system utilizes a newly installed in-vessel focusing mirror that produces a beam waist diameter of 3.5–5 cm in the plasma depending on the frequency. A single antenna (i.e., monostatic operation) is used for both launch and receive. The DBS wavenumber is selected via an adjustable launch angle and variable probing frequency. Due to the unique system design both positive and negative wavenumbers can be obtained, with a range of low to intermediate wavenumbers possible (approximately −3 to 10 cm−1 [cm superscript -1]). A unique feature of the design is the ability to place the DBS and CECE measurements at the same radial and poloidal locations allowing for cross correlation studies (e.g., measurement of nT cross-phase). United States. Dept. of Energy (Grant No. DE-FG02-08ER54984) United States. Dept. of Energy (Grant No. DE-AC05-06OR23100) 2011-09-28T17:15:02Z 2011-09-28T17:15:02Z 2010-10 2010-05 Article http://purl.org/eprint/type/ConferencePaper 0034-6748 http://hdl.handle.net/1721.1/66099 Rhodes, T. L. et al. “Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak.” Review of Scientific Instruments 81(2010): 10D912. © 2010 American Institute of Physics https://orcid.org/0000-0003-2951-9749 en_US http://dx.doi.org/10.1063/1.3475797 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 American Institute of Physics AIP |
| spellingShingle | Rhodes, T. L. Peebles, W. A. Nguyen, X. Hillesheim, J. C. Schmitz, L. White, Anne E. Wang, G. Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak |
| title | Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak |
| title_full | Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak |
| title_fullStr | Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak |
| title_full_unstemmed | Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak |
| title_short | Quasioptical design of integrated Doppler backscattering and correlation electron cyclotron emission systems on the DIII-D tokamak |
| title_sort | quasioptical design of integrated doppler backscattering and correlation electron cyclotron emission systems on the diii d tokamak |
| url | http://hdl.handle.net/1721.1/66099 https://orcid.org/0000-0003-2951-9749 |
| work_keys_str_mv | AT rhodestl quasiopticaldesignofintegrateddopplerbackscatteringandcorrelationelectroncyclotronemissionsystemsonthediiidtokamak AT peebleswa quasiopticaldesignofintegrateddopplerbackscatteringandcorrelationelectroncyclotronemissionsystemsonthediiidtokamak AT nguyenx quasiopticaldesignofintegrateddopplerbackscatteringandcorrelationelectroncyclotronemissionsystemsonthediiidtokamak AT hillesheimjc quasiopticaldesignofintegrateddopplerbackscatteringandcorrelationelectroncyclotronemissionsystemsonthediiidtokamak AT schmitzl quasiopticaldesignofintegrateddopplerbackscatteringandcorrelationelectroncyclotronemissionsystemsonthediiidtokamak AT whiteannee quasiopticaldesignofintegrateddopplerbackscatteringandcorrelationelectroncyclotronemissionsystemsonthediiidtokamak AT wangg quasiopticaldesignofintegrateddopplerbackscatteringandcorrelationelectroncyclotronemissionsystemsonthediiidtokamak |