Pedestal magnetic turbulence measurements in ELMy H-mode DIII-D plasmas by Faraday-effect polarimetry
Internal magnetic fluctuation measurements are utilized to identify turbulence associated with micro-tearing modes (MTM) in the DIII-D Edge-Localized-Mode (ELM)-y H-mode pedestal. Using a Faraday-effect polarimeter, magnetic turbulence (150–500 kHz) is directly observed with a typical line-averaged...
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| Veröffentlicht in: | Physics of plasmas 2021-02, Vol.28 (2) |
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| container_title | Physics of plasmas |
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| creator | Chen, J. Brower, D. L. Ding, W. X. Yan, Z. Curie, M. Kotschenreuther, M. Osborne, T. Strait, E. Hatch, D. R. Halfmoon, M. R. Mahajan, S. M. Jian, X. |
| description | Internal magnetic fluctuation measurements are utilized to identify turbulence associated with micro-tearing modes (MTM) in the DIII-D Edge-Localized-Mode (ELM)-y H-mode pedestal. Using a Faraday-effect polarimeter, magnetic turbulence (150–500 kHz) is directly observed with a typical line-averaged fluctuation amplitude of ∼0.8 G at peak frequency (250 kHz) and ∼15 G integrated over the spectrum from 150 to 500 kHz. Frequency, poloidal wavenumber, and propagation direction of the magnetic turbulence all serve to identify as MTM. Magnetic turbulence amplitude non-monotonically correlates with collision frequency, peaks off mid-plane, and correlates with electron temperature gradient evolution between ELMs, consistent with MTM features identified from theory and gyro-kinetic simulation. The magnetic turbulence growth correlates with confinement degradation in ELMy H-mode plasmas during a slow density ramp. These internal measurements provide unique constraints toward developing physics understanding and validating models of the H-mode pedestal for future devices. |
| doi_str_mv | 10.1063/5.0039154 |
| format | Article |
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L. ; Ding, W. X. ; Yan, Z. ; Curie, M. ; Kotschenreuther, M. ; Osborne, T. ; Strait, E. ; Hatch, D. R. ; Halfmoon, M. R. ; Mahajan, S. M. ; Jian, X.</creator><creatorcontrib>Chen, J. ; Brower, D. L. ; Ding, W. X. ; Yan, Z. ; Curie, M. ; Kotschenreuther, M. ; Osborne, T. ; Strait, E. ; Hatch, D. R. ; Halfmoon, M. R. ; Mahajan, S. M. ; Jian, X.</creatorcontrib><description>Internal magnetic fluctuation measurements are utilized to identify turbulence associated with micro-tearing modes (MTM) in the DIII-D Edge-Localized-Mode (ELM)-y H-mode pedestal. Using a Faraday-effect polarimeter, magnetic turbulence (150–500 kHz) is directly observed with a typical line-averaged fluctuation amplitude of ∼0.8 G at peak frequency (250 kHz) and ∼15 G integrated over the spectrum from 150 to 500 kHz. Frequency, poloidal wavenumber, and propagation direction of the magnetic turbulence all serve to identify as MTM. Magnetic turbulence amplitude non-monotonically correlates with collision frequency, peaks off mid-plane, and correlates with electron temperature gradient evolution between ELMs, consistent with MTM features identified from theory and gyro-kinetic simulation. The magnetic turbulence growth correlates with confinement degradation in ELMy H-mode plasmas during a slow density ramp. These internal measurements provide unique constraints toward developing physics understanding and validating models of the H-mode pedestal for future devices.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/5.0039154</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Amplitudes ; Correlation ; Electron energy ; Magnetic variations ; Peak frequency ; Plasma physics ; Plasmas (physics) ; Polarimeters ; Polarimetry ; Tearing modes (plasmas) ; Turbulence ; Wave propagation ; Wavelengths</subject><ispartof>Physics of plasmas, 2021-02, Vol.28 (2)</ispartof><rights>Author(s)</rights><rights>2021 Author(s). 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Using a Faraday-effect polarimeter, magnetic turbulence (150–500 kHz) is directly observed with a typical line-averaged fluctuation amplitude of ∼0.8 G at peak frequency (250 kHz) and ∼15 G integrated over the spectrum from 150 to 500 kHz. Frequency, poloidal wavenumber, and propagation direction of the magnetic turbulence all serve to identify as MTM. Magnetic turbulence amplitude non-monotonically correlates with collision frequency, peaks off mid-plane, and correlates with electron temperature gradient evolution between ELMs, consistent with MTM features identified from theory and gyro-kinetic simulation. The magnetic turbulence growth correlates with confinement degradation in ELMy H-mode plasmas during a slow density ramp. These internal measurements provide unique constraints toward developing physics understanding and validating models of the H-mode pedestal for future devices.</description><subject>Amplitudes</subject><subject>Correlation</subject><subject>Electron energy</subject><subject>Magnetic variations</subject><subject>Peak frequency</subject><subject>Plasma physics</subject><subject>Plasmas (physics)</subject><subject>Polarimeters</subject><subject>Polarimetry</subject><subject>Tearing modes (plasmas)</subject><subject>Turbulence</subject><subject>Wave propagation</subject><subject>Wavelengths</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp90M1LwzAUAPAiCs7pwf8g6EmhM23TJj3KPtxgoocdvIUkfdGOtqlJKvS_t6NDD4Kn9w6_9xkE1xGeRThLHtIZxkkepeQkmESY5SHNKDk95BSHWUbezoML5_YYY5KlbBLAKxTgvKhQLd4b8KVCvrOyq6BRgGoQrrNQQ-MdKhu03D73aB3WpgC02Gw24QK1lXC1cEj2aCWsKEQfgtagPGpNJWxZg7f9ZXCmReXg6hinwW613M3X4fblaTN_3IYqYbkPJVCdYCZpjAsGsVSJllmkCpwLSnNgESOiiLUsgFBBcikVYwRyrYcahUkyDW7Gtsb5kjtVelAfyjTNsA6PaJaSOB7Q7Yhaaz674Xa-N51thrV4TBijaR7HeFB3o1LWOGdB83a4RdieR5gfPs1Tfvz0YO9He5gofGmaH_xl7C_kbaH_w387fwPfrIyF</recordid><startdate>202102</startdate><enddate>202102</enddate><creator>Chen, J.</creator><creator>Brower, D. 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M.</creator><creator>Jian, X.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-4853-5341</orcidid><orcidid>https://orcid.org/0000-0002-6856-8730</orcidid><orcidid>https://orcid.org/0000-0003-3052-1694</orcidid><orcidid>https://orcid.org/0000000330521694</orcidid><orcidid>https://orcid.org/0000000248535341</orcidid><orcidid>https://orcid.org/0000000268568730</orcidid></search><sort><creationdate>202102</creationdate><title>Pedestal magnetic turbulence measurements in ELMy H-mode DIII-D plasmas by Faraday-effect polarimetry</title><author>Chen, J. ; Brower, D. L. ; Ding, W. X. ; Yan, Z. ; Curie, M. ; Kotschenreuther, M. ; Osborne, T. ; Strait, E. ; Hatch, D. R. ; Halfmoon, M. R. ; Mahajan, S. 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X.</creatorcontrib><creatorcontrib>Yan, Z.</creatorcontrib><creatorcontrib>Curie, M.</creatorcontrib><creatorcontrib>Kotschenreuther, M.</creatorcontrib><creatorcontrib>Osborne, T.</creatorcontrib><creatorcontrib>Strait, E.</creatorcontrib><creatorcontrib>Hatch, D. R.</creatorcontrib><creatorcontrib>Halfmoon, M. R.</creatorcontrib><creatorcontrib>Mahajan, S. M.</creatorcontrib><creatorcontrib>Jian, X.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chen, J.</au><au>Brower, D. L.</au><au>Ding, W. X.</au><au>Yan, Z.</au><au>Curie, M.</au><au>Kotschenreuther, M.</au><au>Osborne, T.</au><au>Strait, E.</au><au>Hatch, D. R.</au><au>Halfmoon, M. R.</au><au>Mahajan, S. M.</au><au>Jian, X.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Pedestal magnetic turbulence measurements in ELMy H-mode DIII-D plasmas by Faraday-effect polarimetry</atitle><jtitle>Physics of plasmas</jtitle><date>2021-02</date><risdate>2021</risdate><volume>28</volume><issue>2</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>Internal magnetic fluctuation measurements are utilized to identify turbulence associated with micro-tearing modes (MTM) in the DIII-D Edge-Localized-Mode (ELM)-y H-mode pedestal. Using a Faraday-effect polarimeter, magnetic turbulence (150–500 kHz) is directly observed with a typical line-averaged fluctuation amplitude of ∼0.8 G at peak frequency (250 kHz) and ∼15 G integrated over the spectrum from 150 to 500 kHz. Frequency, poloidal wavenumber, and propagation direction of the magnetic turbulence all serve to identify as MTM. Magnetic turbulence amplitude non-monotonically correlates with collision frequency, peaks off mid-plane, and correlates with electron temperature gradient evolution between ELMs, consistent with MTM features identified from theory and gyro-kinetic simulation. The magnetic turbulence growth correlates with confinement degradation in ELMy H-mode plasmas during a slow density ramp. 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| source | AIP Journals; Alma/SFX Local Collection |
| subjects | Amplitudes Correlation Electron energy Magnetic variations Peak frequency Plasma physics Plasmas (physics) Polarimeters Polarimetry Tearing modes (plasmas) Turbulence Wave propagation Wavelengths |
| title | Pedestal magnetic turbulence measurements in ELMy H-mode DIII-D plasmas by Faraday-effect polarimetry |
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