Density scaling on n = 1 error field penetration in ohmically heated discharges in EAST
Density scaling of error field penetration in EAST is investigated with different n = 1 magnetic perturbation coil configurations in ohmically heated discharges. The density scalings of error field penetration thresholds under two magnetic perturbation spectra are br∝ne0.5 and br∝ne0.6, where br i...
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Veröffentlicht in: | Nuclear fusion 2018-05, Vol.58 (5), p.56024 |
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creator | Wang, Hui-Hui Sun, You-Wen Shi, Tong-Hui Zang, Qing Liu, Yue-Qiang Yang, Xu Gu, Shuai He, Kai-Yang Gu, Xiang Qian, Jin-Ping Shen, Biao Luo, Zheng-Ping Chu, Nan Jia, Man-Ni Sheng, Zhi-Cai Liu, Hai-Qing Gong, Xian-Zu Wan, Bao-Nian |
description | Density scaling of error field penetration in EAST is investigated with different n = 1 magnetic perturbation coil configurations in ohmically heated discharges. The density scalings of error field penetration thresholds under two magnetic perturbation spectra are br∝ne0.5 and br∝ne0.6, where br is the error field and ne is the line averaged electron density. One difficulty in understanding the density scaling is that key parameters other than density in determining the field penetration process may also be changed when the plasma density changes. Therefore, they should be determined from experiments. The estimated theoretical analysis (br∝ne0.54 in lower density region and br∝ne0.40 in higher density region), using the density dependence of viscosity diffusion time, electron temperature and mode frequency measured from the experiments, is consistent with the observed scaling. One of the key points to reproduce the observed scaling in EAST is that the viscosity diffusion time estimated from energy confinement time is almost constant. It means that the plasma confinement lies in saturation ohmic confinement regime rather than the linear Neo-Alcator regime causing weak density dependence in the previous theoretical studies. |
doi_str_mv | 10.1088/1741-4326/aab5c0 |
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The density scalings of error field penetration thresholds under two magnetic perturbation spectra are br∝ne0.5 and br∝ne0.6, where br is the error field and ne is the line averaged electron density. One difficulty in understanding the density scaling is that key parameters other than density in determining the field penetration process may also be changed when the plasma density changes. Therefore, they should be determined from experiments. The estimated theoretical analysis (br∝ne0.54 in lower density region and br∝ne0.40 in higher density region), using the density dependence of viscosity diffusion time, electron temperature and mode frequency measured from the experiments, is consistent with the observed scaling. One of the key points to reproduce the observed scaling in EAST is that the viscosity diffusion time estimated from energy confinement time is almost constant. It means that the plasma confinement lies in saturation ohmic confinement regime rather than the linear Neo-Alcator regime causing weak density dependence in the previous theoretical studies.</description><identifier>ISSN: 0029-5515</identifier><identifier>EISSN: 1741-4326</identifier><identifier>DOI: 10.1088/1741-4326/aab5c0</identifier><identifier>CODEN: NUFUAU</identifier><language>eng</language><publisher>IOP Publishing</publisher><subject>density scaling ; EAST ; error field ; theoretical analysis</subject><ispartof>Nuclear fusion, 2018-05, Vol.58 (5), p.56024</ispartof><rights>2018 IAEA, Vienna</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c280t-5875a8aa0f791749083698b6b7f6d7e5afbdb7c39ecd434111de7d40a9afb2e43</citedby><cites>FETCH-LOGICAL-c280t-5875a8aa0f791749083698b6b7f6d7e5afbdb7c39ecd434111de7d40a9afb2e43</cites><orcidid>0000-0002-9934-1328 ; 0000-0002-1672-9782 ; 0000-0001-6373-1650</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.1088/1741-4326/aab5c0/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>314,780,784,27924,27925,53846,53893</link.rule.ids></links><search><creatorcontrib>Wang, Hui-Hui</creatorcontrib><creatorcontrib>Sun, You-Wen</creatorcontrib><creatorcontrib>Shi, Tong-Hui</creatorcontrib><creatorcontrib>Zang, Qing</creatorcontrib><creatorcontrib>Liu, Yue-Qiang</creatorcontrib><creatorcontrib>Yang, Xu</creatorcontrib><creatorcontrib>Gu, Shuai</creatorcontrib><creatorcontrib>He, Kai-Yang</creatorcontrib><creatorcontrib>Gu, Xiang</creatorcontrib><creatorcontrib>Qian, Jin-Ping</creatorcontrib><creatorcontrib>Shen, Biao</creatorcontrib><creatorcontrib>Luo, Zheng-Ping</creatorcontrib><creatorcontrib>Chu, Nan</creatorcontrib><creatorcontrib>Jia, Man-Ni</creatorcontrib><creatorcontrib>Sheng, Zhi-Cai</creatorcontrib><creatorcontrib>Liu, Hai-Qing</creatorcontrib><creatorcontrib>Gong, Xian-Zu</creatorcontrib><creatorcontrib>Wan, Bao-Nian</creatorcontrib><creatorcontrib>EAST Contributors</creatorcontrib><title>Density scaling on n = 1 error field penetration in ohmically heated discharges in EAST</title><title>Nuclear fusion</title><addtitle>NF</addtitle><addtitle>Nucl. Fusion</addtitle><description>Density scaling of error field penetration in EAST is investigated with different n = 1 magnetic perturbation coil configurations in ohmically heated discharges. The density scalings of error field penetration thresholds under two magnetic perturbation spectra are br∝ne0.5 and br∝ne0.6, where br is the error field and ne is the line averaged electron density. One difficulty in understanding the density scaling is that key parameters other than density in determining the field penetration process may also be changed when the plasma density changes. Therefore, they should be determined from experiments. The estimated theoretical analysis (br∝ne0.54 in lower density region and br∝ne0.40 in higher density region), using the density dependence of viscosity diffusion time, electron temperature and mode frequency measured from the experiments, is consistent with the observed scaling. One of the key points to reproduce the observed scaling in EAST is that the viscosity diffusion time estimated from energy confinement time is almost constant. It means that the plasma confinement lies in saturation ohmic confinement regime rather than the linear Neo-Alcator regime causing weak density dependence in the previous theoretical studies.</description><subject>density scaling</subject><subject>EAST</subject><subject>error field</subject><subject>theoretical analysis</subject><issn>0029-5515</issn><issn>1741-4326</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp1kDFPwzAQhS0EEqWwM_oHEGrHduwMDFVpAakSA2WOHPvSukqdyg5DN1b-Jr8ER0FsSCc96d57p9OH0C0l95QoNaOS04yzvJhpXQtDztDkb3WOJoTkZSYEFZfoKsY9IZRTxiZIP4KPrj_haHTr_BZ3Hvvvz680D6NQDCF0ATcOWouP4KEPuncp5zzudgeXiu0J70D3YLF10ex02EIc7OX8bXONLhrdRrj51Sl6Xy03i-ds_fr0spivM5Mr0mdCSaGV1qSRZXq8JIoVpaqLWjaFlSB0U9taGlaCsZxxSqkFaTnRZXJy4GyKyHjXhC7GAE11DO6gw6mipBoQVQOPauBRjYhS5W6suO5Y7buP4NOD_8d_AE6kbC8</recordid><startdate>20180501</startdate><enddate>20180501</enddate><creator>Wang, Hui-Hui</creator><creator>Sun, You-Wen</creator><creator>Shi, Tong-Hui</creator><creator>Zang, Qing</creator><creator>Liu, Yue-Qiang</creator><creator>Yang, Xu</creator><creator>Gu, Shuai</creator><creator>He, Kai-Yang</creator><creator>Gu, Xiang</creator><creator>Qian, Jin-Ping</creator><creator>Shen, Biao</creator><creator>Luo, Zheng-Ping</creator><creator>Chu, Nan</creator><creator>Jia, Man-Ni</creator><creator>Sheng, Zhi-Cai</creator><creator>Liu, Hai-Qing</creator><creator>Gong, Xian-Zu</creator><creator>Wan, Bao-Nian</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0002-9934-1328</orcidid><orcidid>https://orcid.org/0000-0002-1672-9782</orcidid><orcidid>https://orcid.org/0000-0001-6373-1650</orcidid></search><sort><creationdate>20180501</creationdate><title>Density scaling on n = 1 error field penetration in ohmically heated discharges in EAST</title><author>Wang, Hui-Hui ; Sun, You-Wen ; Shi, Tong-Hui ; Zang, Qing ; Liu, Yue-Qiang ; Yang, Xu ; Gu, Shuai ; He, Kai-Yang ; Gu, Xiang ; Qian, Jin-Ping ; Shen, Biao ; Luo, Zheng-Ping ; Chu, Nan ; Jia, Man-Ni ; Sheng, Zhi-Cai ; Liu, Hai-Qing ; Gong, Xian-Zu ; Wan, Bao-Nian</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c280t-5875a8aa0f791749083698b6b7f6d7e5afbdb7c39ecd434111de7d40a9afb2e43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>density scaling</topic><topic>EAST</topic><topic>error field</topic><topic>theoretical analysis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, Hui-Hui</creatorcontrib><creatorcontrib>Sun, You-Wen</creatorcontrib><creatorcontrib>Shi, Tong-Hui</creatorcontrib><creatorcontrib>Zang, Qing</creatorcontrib><creatorcontrib>Liu, Yue-Qiang</creatorcontrib><creatorcontrib>Yang, Xu</creatorcontrib><creatorcontrib>Gu, Shuai</creatorcontrib><creatorcontrib>He, Kai-Yang</creatorcontrib><creatorcontrib>Gu, Xiang</creatorcontrib><creatorcontrib>Qian, Jin-Ping</creatorcontrib><creatorcontrib>Shen, Biao</creatorcontrib><creatorcontrib>Luo, Zheng-Ping</creatorcontrib><creatorcontrib>Chu, Nan</creatorcontrib><creatorcontrib>Jia, Man-Ni</creatorcontrib><creatorcontrib>Sheng, Zhi-Cai</creatorcontrib><creatorcontrib>Liu, Hai-Qing</creatorcontrib><creatorcontrib>Gong, Xian-Zu</creatorcontrib><creatorcontrib>Wan, Bao-Nian</creatorcontrib><creatorcontrib>EAST Contributors</creatorcontrib><collection>CrossRef</collection><jtitle>Nuclear fusion</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wang, Hui-Hui</au><au>Sun, You-Wen</au><au>Shi, Tong-Hui</au><au>Zang, Qing</au><au>Liu, Yue-Qiang</au><au>Yang, Xu</au><au>Gu, Shuai</au><au>He, Kai-Yang</au><au>Gu, Xiang</au><au>Qian, Jin-Ping</au><au>Shen, Biao</au><au>Luo, Zheng-Ping</au><au>Chu, Nan</au><au>Jia, Man-Ni</au><au>Sheng, Zhi-Cai</au><au>Liu, Hai-Qing</au><au>Gong, Xian-Zu</au><au>Wan, Bao-Nian</au><aucorp>EAST Contributors</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Density scaling on n = 1 error field penetration in ohmically heated discharges in EAST</atitle><jtitle>Nuclear fusion</jtitle><stitle>NF</stitle><addtitle>Nucl. Fusion</addtitle><date>2018-05-01</date><risdate>2018</risdate><volume>58</volume><issue>5</issue><spage>56024</spage><pages>56024-</pages><issn>0029-5515</issn><eissn>1741-4326</eissn><coden>NUFUAU</coden><abstract>Density scaling of error field penetration in EAST is investigated with different n = 1 magnetic perturbation coil configurations in ohmically heated discharges. The density scalings of error field penetration thresholds under two magnetic perturbation spectra are br∝ne0.5 and br∝ne0.6, where br is the error field and ne is the line averaged electron density. One difficulty in understanding the density scaling is that key parameters other than density in determining the field penetration process may also be changed when the plasma density changes. Therefore, they should be determined from experiments. The estimated theoretical analysis (br∝ne0.54 in lower density region and br∝ne0.40 in higher density region), using the density dependence of viscosity diffusion time, electron temperature and mode frequency measured from the experiments, is consistent with the observed scaling. One of the key points to reproduce the observed scaling in EAST is that the viscosity diffusion time estimated from energy confinement time is almost constant. It means that the plasma confinement lies in saturation ohmic confinement regime rather than the linear Neo-Alcator regime causing weak density dependence in the previous theoretical studies.</abstract><pub>IOP Publishing</pub><doi>10.1088/1741-4326/aab5c0</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-9934-1328</orcidid><orcidid>https://orcid.org/0000-0002-1672-9782</orcidid><orcidid>https://orcid.org/0000-0001-6373-1650</orcidid></addata></record> |
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title | Density scaling on n = 1 error field penetration in ohmically heated discharges in EAST |
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