Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited)
The Synthetic Aperture Microwave Imaging (SAMI) system is a novel diagnostic consisting of an array of 8 independently phased antennas. At any one time, SAMI operates at one of the 16 frequencies in the range 10-34.5 GHz. The imaging beam is steered in software post-shot to create a picture of the e...
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craippubl:10.1063/1.4962253 2024-02-11T10:08:20+01:00 Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited) Vann, R. G. L. Brunner, K. J. Ellis, R. Taylor, G. Thomas, D. A. 2016 http://dx.doi.org/10.1063/1.4962253 https://pubs.aip.org/aip/rsi/article-pdf/doi/10.1063/1.4962253/16051807/11d902_1_online.pdf en eng AIP Publishing Review of Scientific Instruments volume 87, issue 11 ISSN 0034-6748 1089-7623 Instrumentation journal-article 2016 craippubl https://doi.org/10.1063/1.4962253 2024-01-26T09:43:56Z The Synthetic Aperture Microwave Imaging (SAMI) system is a novel diagnostic consisting of an array of 8 independently phased antennas. At any one time, SAMI operates at one of the 16 frequencies in the range 10-34.5 GHz. The imaging beam is steered in software post-shot to create a picture of the entire emission surface. In SAMI’s active probing mode of operation, the plasma edge is illuminated with a monochromatic source and SAMI reconstructs an image of the Doppler back-scattered (DBS) signal. By assuming that density fluctuations are extended along magnetic field lines, and knowing that the strongest back-scattered signals are directed perpendicular to the density fluctuations, SAMI’s 2-D DBS imaging capability can be used to measure the pitch of the edge magnetic field. In this paper, we present preliminary pitch angle measurements obtained by SAMI on the Mega Amp Spherical Tokamak (MAST) at Culham Centre for Fusion Energy and on the National Spherical Torus Experiment Upgrade at Princeton Plasma Physics Laboratory. The results demonstrate encouraging agreement between SAMI and other independent measurements. Article in Journal/Newspaper sami AIP Publishing Review of Scientific Instruments 87 11 |
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Instrumentation Vann, R. G. L. Brunner, K. J. Ellis, R. Taylor, G. Thomas, D. A. Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited) |
topic_facet |
Instrumentation |
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The Synthetic Aperture Microwave Imaging (SAMI) system is a novel diagnostic consisting of an array of 8 independently phased antennas. At any one time, SAMI operates at one of the 16 frequencies in the range 10-34.5 GHz. The imaging beam is steered in software post-shot to create a picture of the entire emission surface. In SAMI’s active probing mode of operation, the plasma edge is illuminated with a monochromatic source and SAMI reconstructs an image of the Doppler back-scattered (DBS) signal. By assuming that density fluctuations are extended along magnetic field lines, and knowing that the strongest back-scattered signals are directed perpendicular to the density fluctuations, SAMI’s 2-D DBS imaging capability can be used to measure the pitch of the edge magnetic field. In this paper, we present preliminary pitch angle measurements obtained by SAMI on the Mega Amp Spherical Tokamak (MAST) at Culham Centre for Fusion Energy and on the National Spherical Torus Experiment Upgrade at Princeton Plasma Physics Laboratory. The results demonstrate encouraging agreement between SAMI and other independent measurements. |
format |
Article in Journal/Newspaper |
author |
Vann, R. G. L. Brunner, K. J. Ellis, R. Taylor, G. Thomas, D. A. |
author_facet |
Vann, R. G. L. Brunner, K. J. Ellis, R. Taylor, G. Thomas, D. A. |
author_sort |
Vann, R. G. L. |
title |
Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited) |
title_short |
Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited) |
title_full |
Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited) |
title_fullStr |
Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited) |
title_full_unstemmed |
Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited) |
title_sort |
preliminary measurements of the edge magnetic field pitch from 2-d doppler backscattering in mast and nstx-u (invited) |
publisher |
AIP Publishing |
publishDate |
2016 |
url |
http://dx.doi.org/10.1063/1.4962253 https://pubs.aip.org/aip/rsi/article-pdf/doi/10.1063/1.4962253/16051807/11d902_1_online.pdf |
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sami |
genre_facet |
sami |
op_source |
Review of Scientific Instruments volume 87, issue 11 ISSN 0034-6748 1089-7623 |
op_doi |
https://doi.org/10.1063/1.4962253 |
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Review of Scientific Instruments |
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87 |
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11 |
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1790607432397881344 |