Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque
Recent experiments on DIII-D have shown it is possible to create and sustain wide pedestal quiescent H-mode (QH-mode) plasmas with zero net torque from neutral beam injection (NBI) for the full discharge duration. Wide pedestal QH-mode has many of the features of the previously investigated QH-mode...
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| Veröffentlicht in: | Nuclear fusion 2020-08, Vol.60 (8), p.86005 |
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| container_title | Nuclear fusion |
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| creator | Burrell, K.H. Chen, Xi Chrystal, C. Ernst, D.R. Grierson, B.A. Haskey, S.R. Osborne, T.H. Paz-Soldan, C. Wilks, T.M. |
| description | Recent experiments on DIII-D have shown it is possible to create and sustain wide pedestal quiescent H-mode (QH-mode) plasmas with zero net torque from neutral beam injection (NBI) for the full discharge duration. Wide pedestal QH-mode has many of the features of the previously investigated QH-mode while having the advantage of increased edge pedestal pressure and excellent energy confinement time. Both QH-mode variants operate without edge localized modes. Accordingly, these new discharges demonstrate that significant input torque is not essential to the exploitation of wide pedestal QH-mode in future devices that are expected to have small or non-existent NBI torque. Developing operating conditions that allowed net zero torque access to wide pedestal QH-mode required implementing several techniques to avoid locked modes including minimizing intrinsic error fields, avoiding large sawteeth, and driving toroidal rotation via neoclassical toroidal viscosity. |
| doi_str_mv | 10.1088/1741-4326/ab940d |
| format | Article |
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Wide pedestal QH-mode has many of the features of the previously investigated QH-mode while having the advantage of increased edge pedestal pressure and excellent energy confinement time. Both QH-mode variants operate without edge localized modes. Accordingly, these new discharges demonstrate that significant input torque is not essential to the exploitation of wide pedestal QH-mode in future devices that are expected to have small or non-existent NBI torque. Developing operating conditions that allowed net zero torque access to wide pedestal QH-mode required implementing several techniques to avoid locked modes including minimizing intrinsic error fields, avoiding large sawteeth, and driving toroidal rotation via neoclassical toroidal viscosity.</description><identifier>ISSN: 0029-5515</identifier><identifier>EISSN: 1741-4326</identifier><identifier>DOI: 10.1088/1741-4326/ab940d</identifier><identifier>CODEN: NUFUAU</identifier><language>eng</language><publisher>IAEA: IOP Publishing</publisher><subject>elm-free operation ; H-mode ; magnetic fusion ; zero neutral beam torque</subject><ispartof>Nuclear fusion, 2020-08, Vol.60 (8), p.86005</ispartof><rights>2020 IAEA, Vienna</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c380t-a2daa902846b836e084a28de0f03d2261bb5fb247d723754dd151be2be9f3b813</citedby><cites>FETCH-LOGICAL-c380t-a2daa902846b836e084a28de0f03d2261bb5fb247d723754dd151be2be9f3b813</cites><orcidid>0000-0001-5069-4934 ; 0000-0001-5918-6506 ; 0000-0002-2639-1228 ; 0000-0002-8718-6877 ; 0000-0003-3049-8658 ; 0000-0002-9978-6597 ; 0000000330498658 ; 0000000299786597 ; 0000000150694934 ; 0000000287186877 ; 0000000226391228 ; 0000000159186506</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/ab940d/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>230,314,776,780,881,27901,27902,53821,53868</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/1636853$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Burrell, K.H.</creatorcontrib><creatorcontrib>Chen, Xi</creatorcontrib><creatorcontrib>Chrystal, C.</creatorcontrib><creatorcontrib>Ernst, D.R.</creatorcontrib><creatorcontrib>Grierson, B.A.</creatorcontrib><creatorcontrib>Haskey, S.R.</creatorcontrib><creatorcontrib>Osborne, T.H.</creatorcontrib><creatorcontrib>Paz-Soldan, C.</creatorcontrib><creatorcontrib>Wilks, T.M.</creatorcontrib><title>Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque</title><title>Nuclear fusion</title><addtitle>NF</addtitle><addtitle>Nucl. Fusion</addtitle><description>Recent experiments on DIII-D have shown it is possible to create and sustain wide pedestal quiescent H-mode (QH-mode) plasmas with zero net torque from neutral beam injection (NBI) for the full discharge duration. Wide pedestal QH-mode has many of the features of the previously investigated QH-mode while having the advantage of increased edge pedestal pressure and excellent energy confinement time. Both QH-mode variants operate without edge localized modes. Accordingly, these new discharges demonstrate that significant input torque is not essential to the exploitation of wide pedestal QH-mode in future devices that are expected to have small or non-existent NBI torque. Developing operating conditions that allowed net zero torque access to wide pedestal QH-mode required implementing several techniques to avoid locked modes including minimizing intrinsic error fields, avoiding large sawteeth, and driving toroidal rotation via neoclassical toroidal viscosity.</description><subject>elm-free operation</subject><subject>H-mode</subject><subject>magnetic fusion</subject><subject>zero neutral beam torque</subject><issn>0029-5515</issn><issn>1741-4326</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kEFLAzEQhYMoWKt3j8GDJ9dOkt1tepSiVih40ZsQks0sTWmTNslS9Ne7ZcWTeBgG3vvewDxCrhncM5BywqYlK0rB64k2sxLsCRn9SqdkBMBnRVWx6pxcpLQGYCUTYkQ-5hF1dsFT7S1NXcra-S36TENLD84i3aHFXt3QfecwNUdrUWxD7xxcXtEvjIF6zP10OfaYQb2lOcR9h5fkrNWbhFc_e0zenx7f5oti-fr8Mn9YFo2QkAvNrdYz4LKsjRQ1giw1lxahBWE5r5kxVWt4ObVTLqZVaS2rmEFucNYKI5kYk5vhbkjZqdS4jM2qCd5jkxWrRS0r0UMwQE0MKUVs1S66rY6fioE6VqiOfaljX2qosI_cDREXdmoduuj7L_7Db__AfatqUFKBrAEqtbOt-AZEzn91</recordid><startdate>20200801</startdate><enddate>20200801</enddate><creator>Burrell, K.H.</creator><creator>Chen, Xi</creator><creator>Chrystal, C.</creator><creator>Ernst, D.R.</creator><creator>Grierson, B.A.</creator><creator>Haskey, S.R.</creator><creator>Osborne, T.H.</creator><creator>Paz-Soldan, C.</creator><creator>Wilks, T.M.</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0001-5069-4934</orcidid><orcidid>https://orcid.org/0000-0001-5918-6506</orcidid><orcidid>https://orcid.org/0000-0002-2639-1228</orcidid><orcidid>https://orcid.org/0000-0002-8718-6877</orcidid><orcidid>https://orcid.org/0000-0003-3049-8658</orcidid><orcidid>https://orcid.org/0000-0002-9978-6597</orcidid><orcidid>https://orcid.org/0000000330498658</orcidid><orcidid>https://orcid.org/0000000299786597</orcidid><orcidid>https://orcid.org/0000000150694934</orcidid><orcidid>https://orcid.org/0000000287186877</orcidid><orcidid>https://orcid.org/0000000226391228</orcidid><orcidid>https://orcid.org/0000000159186506</orcidid></search><sort><creationdate>20200801</creationdate><title>Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque</title><author>Burrell, K.H. ; Chen, Xi ; Chrystal, C. ; Ernst, D.R. ; Grierson, B.A. ; Haskey, S.R. ; Osborne, T.H. ; Paz-Soldan, C. ; Wilks, T.M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c380t-a2daa902846b836e084a28de0f03d2261bb5fb247d723754dd151be2be9f3b813</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>elm-free operation</topic><topic>H-mode</topic><topic>magnetic fusion</topic><topic>zero neutral beam torque</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Burrell, K.H.</creatorcontrib><creatorcontrib>Chen, Xi</creatorcontrib><creatorcontrib>Chrystal, C.</creatorcontrib><creatorcontrib>Ernst, D.R.</creatorcontrib><creatorcontrib>Grierson, B.A.</creatorcontrib><creatorcontrib>Haskey, S.R.</creatorcontrib><creatorcontrib>Osborne, T.H.</creatorcontrib><creatorcontrib>Paz-Soldan, C.</creatorcontrib><creatorcontrib>Wilks, T.M.</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Nuclear fusion</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Burrell, K.H.</au><au>Chen, Xi</au><au>Chrystal, C.</au><au>Ernst, D.R.</au><au>Grierson, B.A.</au><au>Haskey, S.R.</au><au>Osborne, T.H.</au><au>Paz-Soldan, C.</au><au>Wilks, T.M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque</atitle><jtitle>Nuclear fusion</jtitle><stitle>NF</stitle><addtitle>Nucl. Fusion</addtitle><date>2020-08-01</date><risdate>2020</risdate><volume>60</volume><issue>8</issue><spage>86005</spage><pages>86005-</pages><issn>0029-5515</issn><eissn>1741-4326</eissn><coden>NUFUAU</coden><abstract>Recent experiments on DIII-D have shown it is possible to create and sustain wide pedestal quiescent H-mode (QH-mode) plasmas with zero net torque from neutral beam injection (NBI) for the full discharge duration. Wide pedestal QH-mode has many of the features of the previously investigated QH-mode while having the advantage of increased edge pedestal pressure and excellent energy confinement time. Both QH-mode variants operate without edge localized modes. Accordingly, these new discharges demonstrate that significant input torque is not essential to the exploitation of wide pedestal QH-mode in future devices that are expected to have small or non-existent NBI torque. 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| subjects | elm-free operation H-mode magnetic fusion zero neutral beam torque |
| title | Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque |
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