Correlation polarimeter-interferometer in the DIII-D tokamak
A correlation polarimeter-interferometer system has been developed for the DIII-D tokamak to detect small amplitude magnetic and density fluctuations. Two collinear, frequency-offset (5–15 MHz), orthogonally polarized (right- and left-handed, circularly polarized) electromagnetic waves at 650 GHz pr...
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| Veröffentlicht in: | Review of scientific instruments 2021-04, Vol.92 (4), p.043502-043502 |
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| creator | Chen, Jie Brower, David Ding, Weixing Yoneda, Ryota Finkenthal, Daniel |
| description | A correlation polarimeter-interferometer system has been developed for the DIII-D tokamak to detect small amplitude magnetic and density fluctuations. Two collinear, frequency-offset (5–15 MHz), orthogonally polarized (right- and left-handed, circularly polarized) electromagnetic waves at 650 GHz probing the plasma are used to detect the Faraday effect. A third, linearly polarized, electromagnetic wave serves as the local-oscillator to provide a measure of the line-averaged density. Correlation polarimetric measurement is accomplished by correlating the Faraday effect measured along the same line of sight using two independent detectors, whereas simultaneous correlation interferometric measurement is realized by correlating the line-averaged density measured at two different intermediate frequencies. The noise floor of the correlation polarimeter-interferometer has been demonstrated to be more than one order of magnitude lower than that of a standard polarimeter-interferometer measurement. Line-averaged correlation polarimetric-interferometric measurements in DIII-D H-mode plasmas show broadband (up to 750 kHz) magnetic and density fluctuations with amplitudes as low as 0.03Gauss/kHz and 4×1013m−3/kHz, respectively. |
| doi_str_mv | 10.1063/5.0040306 |
| format | Article |
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Two collinear, frequency-offset (5–15 MHz), orthogonally polarized (right- and left-handed, circularly polarized) electromagnetic waves at 650 GHz probing the plasma are used to detect the Faraday effect. A third, linearly polarized, electromagnetic wave serves as the local-oscillator to provide a measure of the line-averaged density. Correlation polarimetric measurement is accomplished by correlating the Faraday effect measured along the same line of sight using two independent detectors, whereas simultaneous correlation interferometric measurement is realized by correlating the line-averaged density measured at two different intermediate frequencies. The noise floor of the correlation polarimeter-interferometer has been demonstrated to be more than one order of magnitude lower than that of a standard polarimeter-interferometer measurement. Line-averaged correlation polarimetric-interferometric measurements in DIII-D H-mode plasmas show broadband (up to 750 kHz) magnetic and density fluctuations with amplitudes as low as 0.03Gauss/kHz and 4×1013m−3/kHz, respectively.</description><identifier>ISSN: 0034-6748</identifier><identifier>EISSN: 1089-7623</identifier><identifier>DOI: 10.1063/5.0040306</identifier><identifier>CODEN: RSINAK</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Amplitudes ; Broadband ; Circular polarization ; Correlation analysis ; Density ; Electromagnetic radiation ; Faraday effect ; Interferometry ; Linear polarization ; Plasmas (physics) ; Polarimeters ; Polarimetry ; Scientific apparatus & instruments ; Tokamak devices</subject><ispartof>Review of scientific instruments, 2021-04, Vol.92 (4), p.043502-043502</ispartof><rights>Author(s)</rights><rights>2021 Author(s). 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Two collinear, frequency-offset (5–15 MHz), orthogonally polarized (right- and left-handed, circularly polarized) electromagnetic waves at 650 GHz probing the plasma are used to detect the Faraday effect. A third, linearly polarized, electromagnetic wave serves as the local-oscillator to provide a measure of the line-averaged density. Correlation polarimetric measurement is accomplished by correlating the Faraday effect measured along the same line of sight using two independent detectors, whereas simultaneous correlation interferometric measurement is realized by correlating the line-averaged density measured at two different intermediate frequencies. The noise floor of the correlation polarimeter-interferometer has been demonstrated to be more than one order of magnitude lower than that of a standard polarimeter-interferometer measurement. Line-averaged correlation polarimetric-interferometric measurements in DIII-D H-mode plasmas show broadband (up to 750 kHz) magnetic and density fluctuations with amplitudes as low as 0.03Gauss/kHz and 4×1013m−3/kHz, respectively.</description><subject>Amplitudes</subject><subject>Broadband</subject><subject>Circular polarization</subject><subject>Correlation analysis</subject><subject>Density</subject><subject>Electromagnetic radiation</subject><subject>Faraday effect</subject><subject>Interferometry</subject><subject>Linear polarization</subject><subject>Plasmas (physics)</subject><subject>Polarimeters</subject><subject>Polarimetry</subject><subject>Scientific apparatus & instruments</subject><subject>Tokamak devices</subject><issn>0034-6748</issn><issn>1089-7623</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp90E1LAzEQBuAgCtbqwX-w6EWFrZNsssmCF2n9KAhe9Byy6Syu3W5qkgr-e2NbFBTMYcLAwzDzEnJMYUShLC7FCIBDAeUOGVBQVS5LVuySAUDB81JytU8OQniF9ASlA3I1dt5jZ2Lr-mzpOuPbBUb0edun2qB36zZr-yy-YDaZTqf5JItubhZmfkj2GtMFPNr-Q_J8e_M0vs8fHu-m4-uH3HLGYq6obVRdK8ukrFEyVLwQjPOZMCBZWXGGUFXM8Fpa3iBaRhvVzEAJO1NM1sWQnGzmuhBbHWwb0b5Y1_doo6ZSFkKIhM42aOnd2wpD1Is2WOw606NbBc2EAFZKCSzR01_01a18n05ICqRUoqhUUucbZb0LwWOjlykc4z80Bf0VthZ6G3ayFxv7tdw6zG_87vwP1MtZ8x_-O_kTX4KKmA</recordid><startdate>20210401</startdate><enddate>20210401</enddate><creator>Chen, Jie</creator><creator>Brower, David</creator><creator>Ding, Weixing</creator><creator>Yoneda, Ryota</creator><creator>Finkenthal, Daniel</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-4853-5341</orcidid><orcidid>https://orcid.org/0000000248535341</orcidid></search><sort><creationdate>20210401</creationdate><title>Correlation polarimeter-interferometer in the DIII-D tokamak</title><author>Chen, Jie ; Brower, David ; Ding, Weixing ; Yoneda, Ryota ; Finkenthal, Daniel</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c422t-81cf8bb8c277be72e8435244d5a0726942e0992a4b7c4feec21f8fd085cd827b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Amplitudes</topic><topic>Broadband</topic><topic>Circular polarization</topic><topic>Correlation analysis</topic><topic>Density</topic><topic>Electromagnetic radiation</topic><topic>Faraday effect</topic><topic>Interferometry</topic><topic>Linear polarization</topic><topic>Plasmas (physics)</topic><topic>Polarimeters</topic><topic>Polarimetry</topic><topic>Scientific apparatus & instruments</topic><topic>Tokamak devices</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chen, Jie</creatorcontrib><creatorcontrib>Brower, David</creatorcontrib><creatorcontrib>Ding, Weixing</creatorcontrib><creatorcontrib>Yoneda, Ryota</creatorcontrib><creatorcontrib>Finkenthal, Daniel</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><collection>OSTI.GOV</collection><jtitle>Review of scientific instruments</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chen, Jie</au><au>Brower, David</au><au>Ding, Weixing</au><au>Yoneda, Ryota</au><au>Finkenthal, Daniel</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Correlation polarimeter-interferometer in the DIII-D tokamak</atitle><jtitle>Review of scientific instruments</jtitle><date>2021-04-01</date><risdate>2021</risdate><volume>92</volume><issue>4</issue><spage>043502</spage><epage>043502</epage><pages>043502-043502</pages><issn>0034-6748</issn><eissn>1089-7623</eissn><coden>RSINAK</coden><abstract>A correlation polarimeter-interferometer system has been developed for the DIII-D tokamak to detect small amplitude magnetic and density fluctuations. Two collinear, frequency-offset (5–15 MHz), orthogonally polarized (right- and left-handed, circularly polarized) electromagnetic waves at 650 GHz probing the plasma are used to detect the Faraday effect. A third, linearly polarized, electromagnetic wave serves as the local-oscillator to provide a measure of the line-averaged density. Correlation polarimetric measurement is accomplished by correlating the Faraday effect measured along the same line of sight using two independent detectors, whereas simultaneous correlation interferometric measurement is realized by correlating the line-averaged density measured at two different intermediate frequencies. The noise floor of the correlation polarimeter-interferometer has been demonstrated to be more than one order of magnitude lower than that of a standard polarimeter-interferometer measurement. Line-averaged correlation polarimetric-interferometric measurements in DIII-D H-mode plasmas show broadband (up to 750 kHz) magnetic and density fluctuations with amplitudes as low as 0.03Gauss/kHz and 4×1013m−3/kHz, respectively.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/5.0040306</doi><tpages>6</tpages><orcidid>https://orcid.org/0000-0002-4853-5341</orcidid><orcidid>https://orcid.org/0000000248535341</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Review of scientific instruments, 2021-04, Vol.92 (4), p.043502-043502 |
| issn | 0034-6748 1089-7623 |
| language | eng |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Amplitudes Broadband Circular polarization Correlation analysis Density Electromagnetic radiation Faraday effect Interferometry Linear polarization Plasmas (physics) Polarimeters Polarimetry Scientific apparatus & instruments Tokamak devices |
| title | Correlation polarimeter-interferometer in the DIII-D tokamak |
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