Analysis of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profile in the Large Helical Device
The analysis method of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profiles in the Large Helical Device has been improved. This was done by using the Variational Moments Equilibrium Code to calculate an equilibrium database for various pressure profiles...
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| Veröffentlicht in: | Review of scientific instruments 2021-05, Vol.92 (5), p.053503-053503 |
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| container_title | Review of scientific instruments |
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| creator | Sanders, M. Ida, K. Yoshinuma, M. Suzuki, C. Yoshimura, Y. Seki, R. Emoto, M. Yoshida, M. Kobayashi, T. |
| description | The analysis method of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profiles in the Large Helical Device has been improved. This was done by using the Variational Moments Equilibrium Code to calculate an equilibrium database for various pressure profiles and current profiles. This method looks for the radial profile of the rotational transform in the equilibrium database that gives the best fit to the polarization angle profiles measured with the MSE diagnostic. This analysis improves the measurements of rotational transform, especially near the magnetic axis, where the sensitivity of the polarization angle measurements becomes low and the uncertainty due to error in the estimation of the Pfirsch–Schlüter current becomes large. The radial profiles of the rotational transform and current profiles for Electron Cyclotron Current Drive and Neutral Beam Current Drive are obtained in the new analysis method with a sufficiently high accuracy to discuss the discrepancy of the current density profiles between the measurements and the calculations. |
| doi_str_mv | 10.1063/5.0018859 |
| format | Article |
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This was done by using the Variational Moments Equilibrium Code to calculate an equilibrium database for various pressure profiles and current profiles. This method looks for the radial profile of the rotational transform in the equilibrium database that gives the best fit to the polarization angle profiles measured with the MSE diagnostic. This analysis improves the measurements of rotational transform, especially near the magnetic axis, where the sensitivity of the polarization angle measurements becomes low and the uncertainty due to error in the estimation of the Pfirsch–Schlüter current becomes large. The radial profiles of the rotational transform and current profiles for Electron Cyclotron Current Drive and Neutral Beam Current Drive are obtained in the new analysis method with a sufficiently high accuracy to discuss the discrepancy of the current density profiles between the measurements and the calculations.</description><identifier>ISSN: 0034-6748</identifier><identifier>EISSN: 1089-7623</identifier><identifier>DOI: 10.1063/5.0018859</identifier><identifier>CODEN: RSINAK</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Cyclotrons ; Diagnostic systems ; Equilibrium ; Mathematical analysis ; Neutral beams ; Polarization ; Scientific apparatus & instruments ; Stark effect</subject><ispartof>Review of scientific instruments, 2021-05, Vol.92 (5), p.053503-053503</ispartof><rights>Author(s)</rights><rights>2021 Author(s). 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This was done by using the Variational Moments Equilibrium Code to calculate an equilibrium database for various pressure profiles and current profiles. This method looks for the radial profile of the rotational transform in the equilibrium database that gives the best fit to the polarization angle profiles measured with the MSE diagnostic. This analysis improves the measurements of rotational transform, especially near the magnetic axis, where the sensitivity of the polarization angle measurements becomes low and the uncertainty due to error in the estimation of the Pfirsch–Schlüter current becomes large. The radial profiles of the rotational transform and current profiles for Electron Cyclotron Current Drive and Neutral Beam Current Drive are obtained in the new analysis method with a sufficiently high accuracy to discuss the discrepancy of the current density profiles between the measurements and the calculations.</description><subject>Cyclotrons</subject><subject>Diagnostic systems</subject><subject>Equilibrium</subject><subject>Mathematical analysis</subject><subject>Neutral beams</subject><subject>Polarization</subject><subject>Scientific apparatus & instruments</subject><subject>Stark effect</subject><issn>0034-6748</issn><issn>1089-7623</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqd0d1KwzAUB_AgCs7phW8Q8GYTOpO2adPLMecHTLyYXpcsOdHMrplJOtgr-NRmbiB4aQgEDr9_SM5B6JKSESVFdsNGhFDOWXWEepTwKimLNDtGPUKyPCnKnJ-iM--XJC5GaQ99jVvRbL3x2Goc3gE_2WBsrOF5EO4DT7UGGfDgaT4dYmXEW2t9MBIHi1cgfOfgJ-VsEIdccKL12roVFq3CsnMO2oDXzmrTADbtj58J9wb4ARojY-QWNkbCOTrRovFwcTj76PVu-jJ5SGbP94-T8SyRjLCQSCi5ymWmS52VUFVZRaVKK0ZUSYQWKpU6kgXnpCRKyIUuZAmK61zknCwgz_posL83vumzAx_qlfESmka0YDtfp4yRtCgoZZFe_aFL27n4y51KaRo3K6Ia7pV01nsHul47sxJuW1NS76ZSs_owlWiv99ZLs2_Z__DGul9Yr5XOvgEXyZxr</recordid><startdate>20210501</startdate><enddate>20210501</enddate><creator>Sanders, M.</creator><creator>Ida, K.</creator><creator>Yoshinuma, M.</creator><creator>Suzuki, C.</creator><creator>Yoshimura, Y.</creator><creator>Seki, R.</creator><creator>Emoto, M.</creator><creator>Yoshida, M.</creator><creator>Kobayashi, T.</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><orcidid>https://orcid.org/0000-0001-5669-1937</orcidid><orcidid>https://orcid.org/0000-0002-5113-9710</orcidid><orcidid>https://orcid.org/0000-0002-5759-0967</orcidid><orcidid>https://orcid.org/0000-0002-5364-805X</orcidid><orcidid>https://orcid.org/0000-0002-0585-4561</orcidid></search><sort><creationdate>20210501</creationdate><title>Analysis of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profile in the Large Helical Device</title><author>Sanders, M. ; Ida, K. ; Yoshinuma, M. ; Suzuki, C. ; Yoshimura, Y. ; Seki, R. ; Emoto, M. ; Yoshida, M. ; Kobayashi, T.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c505t-ce78d4c3f7f37e99391cd2950d70afad2cfce7b88070dacbf6c7ed8f4a480be43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Cyclotrons</topic><topic>Diagnostic systems</topic><topic>Equilibrium</topic><topic>Mathematical analysis</topic><topic>Neutral beams</topic><topic>Polarization</topic><topic>Scientific apparatus & instruments</topic><topic>Stark effect</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sanders, M.</creatorcontrib><creatorcontrib>Ida, K.</creatorcontrib><creatorcontrib>Yoshinuma, M.</creatorcontrib><creatorcontrib>Suzuki, C.</creatorcontrib><creatorcontrib>Yoshimura, Y.</creatorcontrib><creatorcontrib>Seki, R.</creatorcontrib><creatorcontrib>Emoto, M.</creatorcontrib><creatorcontrib>Yoshida, M.</creatorcontrib><creatorcontrib>Kobayashi, T.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Review of scientific instruments</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sanders, M.</au><au>Ida, K.</au><au>Yoshinuma, M.</au><au>Suzuki, C.</au><au>Yoshimura, Y.</au><au>Seki, R.</au><au>Emoto, M.</au><au>Yoshida, M.</au><au>Kobayashi, T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Analysis of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profile in the Large Helical Device</atitle><jtitle>Review of scientific instruments</jtitle><date>2021-05-01</date><risdate>2021</risdate><volume>92</volume><issue>5</issue><spage>053503</spage><epage>053503</epage><pages>053503-053503</pages><issn>0034-6748</issn><eissn>1089-7623</eissn><coden>RSINAK</coden><abstract>The analysis method of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profiles in the Large Helical Device has been improved. 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| fulltext | fulltext |
| identifier | ISSN: 0034-6748 |
| ispartof | Review of scientific instruments, 2021-05, Vol.92 (5), p.053503-053503 |
| issn | 0034-6748 1089-7623 |
| language | eng |
| recordid | cdi_scitation_primary_10_1063_5_0018859 |
| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Cyclotrons Diagnostic systems Equilibrium Mathematical analysis Neutral beams Polarization Scientific apparatus & instruments Stark effect |
| title | Analysis of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profile in the Large Helical Device |
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