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Spurious oscillations affecting FIR polarimetry measurements
Polarimetry measurements of Faraday rotation on Tore Supra are systematically affected by spurious oscillations that may seriously hinder the reconstruction of plasma current profiles. The same behavior has also been regularly observed on other experiments, such as JET and as RFX. Causes of this phe...
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| Published in: | Review of Scientific Instruments 2004-10, Vol.75 (10), p.3405-3407 |
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| cites | cdi_FETCH-LOGICAL-c325t-bfd7a8e95cc4d12679786e808712ef35fe1cfe8afb5dacb19a0b283a783e7e13 |
| container_end_page | 3407 |
| container_issue | 10 |
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| container_title | Review of Scientific Instruments |
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| creator | Elbèze, D. Gil, C. Giannella, R. De Pasqual, L. |
| description | Polarimetry measurements of Faraday rotation on Tore Supra are systematically affected by spurious oscillations that may seriously hinder the reconstruction of plasma current profiles. The same behavior has also been regularly observed on other experiments, such as JET and as RFX. Causes of this phenomenon are interferences between the probing beam and stray radiations having the same frequency. It perturbs the intensity of the signals from the detectors installed on the two orthogonal polarization channels. Experimental tests confirm the dependence of the oscillation amplitudes on the Faraday angle as predicted by the analytical and numerical description of the phenomenon. Special care must be taken to eliminate stray beams: When the stray beam polarization is parallel to the incident one, a relative ratio of the electric field amplitudes |
| doi_str_mv | 10.1063/1.1786637 |
| format | article |
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<1%
has been found to be acceptable (error
<0.06°
) but a much lower ratio must be achieved when polarization is perpendicular. Such oscillations can be also present on polarimeters using beams with modulating polarization. For existing and future polarimeters, special care should be taken to make sure that all the possible sources of stray beams are sufficiently minimized.</description><identifier>ISSN: 0034-6748</identifier><identifier>EISSN: 1089-7623</identifier><identifier>DOI: 10.1063/1.1786637</identifier><identifier>CODEN: RSINAK</identifier><language>eng</language><publisher>United States</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; AMPLITUDES ; ELECTRIC CURRENTS ; ELECTRIC FIELDS ; ERRORS ; FARADAY EFFECT ; OSCILLATIONS ; PLASMA DIAGNOSTICS ; PLASMA JETS ; PLASMA WAVES ; POLARIMETERS ; POLARIMETRY ; POLARIZATION ; STRAY RADIATION ; TORE SUPRA TOKAMAK</subject><ispartof>Review of Scientific Instruments, 2004-10, Vol.75 (10), p.3405-3407</ispartof><rights>American Institute of Physics</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c325t-bfd7a8e95cc4d12679786e808712ef35fe1cfe8afb5dacb19a0b283a783e7e13</citedby><cites>FETCH-LOGICAL-c325t-bfd7a8e95cc4d12679786e808712ef35fe1cfe8afb5dacb19a0b283a783e7e13</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/rsi/article-lookup/doi/10.1063/1.1786637$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>230,309,310,314,776,778,780,785,786,791,881,23909,23910,25118,27901,27902,76126</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/20636637$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Elbèze, D.</creatorcontrib><creatorcontrib>Gil, C.</creatorcontrib><creatorcontrib>Giannella, R.</creatorcontrib><creatorcontrib>De Pasqual, L.</creatorcontrib><creatorcontrib>JET-EFDA Contributors</creatorcontrib><title>Spurious oscillations affecting FIR polarimetry measurements</title><title>Review of Scientific Instruments</title><description>Polarimetry measurements of Faraday rotation on Tore Supra are systematically affected by spurious oscillations that may seriously hinder the reconstruction of plasma current profiles. The same behavior has also been regularly observed on other experiments, such as JET and as RFX. Causes of this phenomenon are interferences between the probing beam and stray radiations having the same frequency. It perturbs the intensity of the signals from the detectors installed on the two orthogonal polarization channels. Experimental tests confirm the dependence of the oscillation amplitudes on the Faraday angle as predicted by the analytical and numerical description of the phenomenon. Special care must be taken to eliminate stray beams: When the stray beam polarization is parallel to the incident one, a relative ratio of the electric field amplitudes
<1%
has been found to be acceptable (error
<0.06°
) but a much lower ratio must be achieved when polarization is perpendicular. Such oscillations can be also present on polarimeters using beams with modulating polarization. For existing and future polarimeters, special care should be taken to make sure that all the possible sources of stray beams are sufficiently minimized.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>AMPLITUDES</subject><subject>ELECTRIC CURRENTS</subject><subject>ELECTRIC FIELDS</subject><subject>ERRORS</subject><subject>FARADAY EFFECT</subject><subject>OSCILLATIONS</subject><subject>PLASMA DIAGNOSTICS</subject><subject>PLASMA JETS</subject><subject>PLASMA WAVES</subject><subject>POLARIMETERS</subject><subject>POLARIMETRY</subject><subject>POLARIZATION</subject><subject>STRAY RADIATION</subject><subject>TORE SUPRA TOKAMAK</subject><issn>0034-6748</issn><issn>1089-7623</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><recordid>eNqdkFFLwzAUhYMoWKcP_oOCTwqduc3apOCLDKeDgaB7D2l6o5WuKUkq7N-b2YHv3pf78nH4ziHkGugcaMnuYQ5clCXjJyQBKqqMlzk7JQmlbJGVfCHOyYX3XzReAZCQh_dhdK0dfWq9brtOhdb2PlXGoA5t_5Gu1m_pYDvl2h0Gt093qPzocId98JfkzKjO49Xxz8h29bRdvmSb1-f18nGTaZYXIatNw5XAqtB60UBe8ioqoqCCQ46GFQZBGxTK1EWjdA2VonUumOKCIUdgM3IzxVofWhk1A-pPbfs-Kso8tj70jdTtRGlnvXdo5BCdldtLoPKwjQR53CaydxN7CPut_D_427o_UA6NYT_eqXND</recordid><startdate>200410</startdate><enddate>200410</enddate><creator>Elbèze, D.</creator><creator>Gil, C.</creator><creator>Giannella, R.</creator><creator>De Pasqual, L.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>200410</creationdate><title>Spurious oscillations affecting FIR polarimetry measurements</title><author>Elbèze, D. ; Gil, C. ; Giannella, R. ; De Pasqual, L.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c325t-bfd7a8e95cc4d12679786e808712ef35fe1cfe8afb5dacb19a0b283a783e7e13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2004</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><topic>AMPLITUDES</topic><topic>ELECTRIC CURRENTS</topic><topic>ELECTRIC FIELDS</topic><topic>ERRORS</topic><topic>FARADAY EFFECT</topic><topic>OSCILLATIONS</topic><topic>PLASMA DIAGNOSTICS</topic><topic>PLASMA JETS</topic><topic>PLASMA WAVES</topic><topic>POLARIMETERS</topic><topic>POLARIMETRY</topic><topic>POLARIZATION</topic><topic>STRAY RADIATION</topic><topic>TORE SUPRA TOKAMAK</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Elbèze, D.</creatorcontrib><creatorcontrib>Gil, C.</creatorcontrib><creatorcontrib>Giannella, R.</creatorcontrib><creatorcontrib>De Pasqual, L.</creatorcontrib><creatorcontrib>JET-EFDA Contributors</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Review of Scientific Instruments</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Elbèze, D.</au><au>Gil, C.</au><au>Giannella, R.</au><au>De Pasqual, L.</au><aucorp>JET-EFDA Contributors</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spurious oscillations affecting FIR polarimetry measurements</atitle><jtitle>Review of Scientific Instruments</jtitle><date>2004-10</date><risdate>2004</risdate><volume>75</volume><issue>10</issue><spage>3405</spage><epage>3407</epage><pages>3405-3407</pages><issn>0034-6748</issn><eissn>1089-7623</eissn><coden>RSINAK</coden><abstract>Polarimetry measurements of Faraday rotation on Tore Supra are systematically affected by spurious oscillations that may seriously hinder the reconstruction of plasma current profiles. The same behavior has also been regularly observed on other experiments, such as JET and as RFX. Causes of this phenomenon are interferences between the probing beam and stray radiations having the same frequency. It perturbs the intensity of the signals from the detectors installed on the two orthogonal polarization channels. Experimental tests confirm the dependence of the oscillation amplitudes on the Faraday angle as predicted by the analytical and numerical description of the phenomenon. Special care must be taken to eliminate stray beams: When the stray beam polarization is parallel to the incident one, a relative ratio of the electric field amplitudes
<1%
has been found to be acceptable (error
<0.06°
) but a much lower ratio must be achieved when polarization is perpendicular. Such oscillations can be also present on polarimeters using beams with modulating polarization. For existing and future polarimeters, special care should be taken to make sure that all the possible sources of stray beams are sufficiently minimized.</abstract><cop>United States</cop><doi>10.1063/1.1786637</doi><tpages>3</tpages></addata></record> |
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| ispartof | Review of Scientific Instruments, 2004-10, Vol.75 (10), p.3405-3407 |
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| source | American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); American Institute of Physics |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY AMPLITUDES ELECTRIC CURRENTS ELECTRIC FIELDS ERRORS FARADAY EFFECT OSCILLATIONS PLASMA DIAGNOSTICS PLASMA JETS PLASMA WAVES POLARIMETERS POLARIMETRY POLARIZATION STRAY RADIATION TORE SUPRA TOKAMAK |
| title | Spurious oscillations affecting FIR polarimetry measurements |
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