Suppression of first-wall interaction in negative triangularity plasmas on TCV
Magnetically confined fusion plasmas with negative triangularity ( δ ) exhibit greater L-mode confinement than with positive δ . Recent experiments in the TCV and DIII-D tokamaks have correlated the confinement improvement to a reduction of fluctuations within the plasma core. We report on fluctuati...
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| Veröffentlicht in: | Nuclear fusion 2021-03, Vol.61 (3), p.34003 |
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| container_title | Nuclear fusion |
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| creator | Han, W. Offeddu, N. Golfinopoulos, T. Theiler, C. Tsui, C.K. Boedo, J.A. Marmar, E.S. the TCV Team |
| description | Magnetically confined fusion plasmas with negative triangularity (
δ
) exhibit greater L-mode confinement than with positive
δ
. Recent experiments in the TCV and DIII-D tokamaks have correlated the confinement improvement to a reduction of fluctuations within the plasma core. We report on fluctuation measurements in the scrape-off layer (SOL) for −0.61 <
δ
< +0.64 in limited and diverted ohmic L-mode plasmas; these reveal a strong reduction in SOL fluctuation amplitudes at
δ
≲ −0.25, and, surprisingly, an almost full suppression of plasma interaction with the main-chamber first-wall, which could have important implications for the prospects of using negative
δ
plasmas as a reactor solution. An exploration of several physical mechanisms suggests that a reduced connection length—intrinsic to negative
δ
plasmas—plays a critical role in the origin of this phenomenon. |
| doi_str_mv | 10.1088/1741-4326/abdb95 |
| format | Article |
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δ
) exhibit greater L-mode confinement than with positive
δ
. Recent experiments in the TCV and DIII-D tokamaks have correlated the confinement improvement to a reduction of fluctuations within the plasma core. We report on fluctuation measurements in the scrape-off layer (SOL) for −0.61 <
δ
< +0.64 in limited and diverted ohmic L-mode plasmas; these reveal a strong reduction in SOL fluctuation amplitudes at
δ
≲ −0.25, and, surprisingly, an almost full suppression of plasma interaction with the main-chamber first-wall, which could have important implications for the prospects of using negative
δ
plasmas as a reactor solution. An exploration of several physical mechanisms suggests that a reduced connection length—intrinsic to negative
δ
plasmas—plays a critical role in the origin of this phenomenon.</description><identifier>ISSN: 0029-5515</identifier><identifier>EISSN: 1741-4326</identifier><identifier>DOI: 10.1088/1741-4326/abdb95</identifier><language>eng</language><publisher>United States: IOP Science</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; Fluctuations ; Magnetic fusion energy ; Negative triangularity ; Tokamaks</subject><ispartof>Nuclear fusion, 2021-03, Vol.61 (3), p.34003</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c312t-d5d023e0ce69c8ff4d062ad850ec4c2cae18302667bba63fbb63b839e7c583933</citedby><cites>FETCH-LOGICAL-c312t-d5d023e0ce69c8ff4d062ad850ec4c2cae18302667bba63fbb63b839e7c583933</cites><orcidid>0000-0002-7554-813X ; 0000-0002-7346-8312 ; 0000-0003-3926-1374 ; 0000-0002-0898-5217</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.osti.gov/servlets/purl/1777485$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Han, W.</creatorcontrib><creatorcontrib>Offeddu, N.</creatorcontrib><creatorcontrib>Golfinopoulos, T.</creatorcontrib><creatorcontrib>Theiler, C.</creatorcontrib><creatorcontrib>Tsui, C.K.</creatorcontrib><creatorcontrib>Boedo, J.A.</creatorcontrib><creatorcontrib>Marmar, E.S.</creatorcontrib><creatorcontrib>the TCV Team</creatorcontrib><creatorcontrib>Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)</creatorcontrib><title>Suppression of first-wall interaction in negative triangularity plasmas on TCV</title><title>Nuclear fusion</title><description>Magnetically confined fusion plasmas with negative triangularity (
δ
) exhibit greater L-mode confinement than with positive
δ
. Recent experiments in the TCV and DIII-D tokamaks have correlated the confinement improvement to a reduction of fluctuations within the plasma core. We report on fluctuation measurements in the scrape-off layer (SOL) for −0.61 <
δ
< +0.64 in limited and diverted ohmic L-mode plasmas; these reveal a strong reduction in SOL fluctuation amplitudes at
δ
≲ −0.25, and, surprisingly, an almost full suppression of plasma interaction with the main-chamber first-wall, which could have important implications for the prospects of using negative
δ
plasmas as a reactor solution. An exploration of several physical mechanisms suggests that a reduced connection length—intrinsic to negative
δ
plasmas—plays a critical role in the origin of this phenomenon.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>Fluctuations</subject><subject>Magnetic fusion energy</subject><subject>Negative triangularity</subject><subject>Tokamaks</subject><issn>0029-5515</issn><issn>1741-4326</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNo9kEtLAzEYRYMoWKt7l8H92DwmmcxSii8ourC6DUnmS41MM0OSKv33dqi4unDv4S4OQteU3FKi1II2Na1qzuTC2M624gTN_qtTNCOEtZUQVJyji5y_CKE15XyGXt5245gg5zBEPHjsQ8ql-jF9j0MskIwr0xIijrAxJXwDLimYuNn1JoWyx2Nv8tZkfIDWy49LdOZNn-HqL-fo_eF-vXyqVq-Pz8u7VeU4ZaXqREcYB-JAtk55X3dEMtMpQcDVjjkDVHHCpGysNZJ7ayW3irfQOHEIzufo5vg75BJ0dqGA-3RDjOCKpk3T1EocIHKEXBpyTuD1mMLWpL2mRE_S9GRIT4b0URr_BaucYT4</recordid><startdate>20210301</startdate><enddate>20210301</enddate><creator>Han, W.</creator><creator>Offeddu, N.</creator><creator>Golfinopoulos, T.</creator><creator>Theiler, C.</creator><creator>Tsui, C.K.</creator><creator>Boedo, J.A.</creator><creator>Marmar, E.S.</creator><creator>the TCV Team</creator><general>IOP Science</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OIOZB</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-7554-813X</orcidid><orcidid>https://orcid.org/0000-0002-7346-8312</orcidid><orcidid>https://orcid.org/0000-0003-3926-1374</orcidid><orcidid>https://orcid.org/0000-0002-0898-5217</orcidid></search><sort><creationdate>20210301</creationdate><title>Suppression of first-wall interaction in negative triangularity plasmas on TCV</title><author>Han, W. ; Offeddu, N. ; Golfinopoulos, T. ; Theiler, C. ; Tsui, C.K. ; Boedo, J.A. ; Marmar, E.S. ; the TCV Team</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c312t-d5d023e0ce69c8ff4d062ad850ec4c2cae18302667bba63fbb63b839e7c583933</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><topic>Fluctuations</topic><topic>Magnetic fusion energy</topic><topic>Negative triangularity</topic><topic>Tokamaks</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Han, W.</creatorcontrib><creatorcontrib>Offeddu, N.</creatorcontrib><creatorcontrib>Golfinopoulos, T.</creatorcontrib><creatorcontrib>Theiler, C.</creatorcontrib><creatorcontrib>Tsui, C.K.</creatorcontrib><creatorcontrib>Boedo, J.A.</creatorcontrib><creatorcontrib>Marmar, E.S.</creatorcontrib><creatorcontrib>the TCV Team</creatorcontrib><creatorcontrib>Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>Nuclear fusion</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Han, W.</au><au>Offeddu, N.</au><au>Golfinopoulos, T.</au><au>Theiler, C.</au><au>Tsui, C.K.</au><au>Boedo, J.A.</au><au>Marmar, E.S.</au><au>the TCV Team</au><aucorp>Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Suppression of first-wall interaction in negative triangularity plasmas on TCV</atitle><jtitle>Nuclear fusion</jtitle><date>2021-03-01</date><risdate>2021</risdate><volume>61</volume><issue>3</issue><spage>34003</spage><pages>34003-</pages><issn>0029-5515</issn><eissn>1741-4326</eissn><abstract>Magnetically confined fusion plasmas with negative triangularity (
δ
) exhibit greater L-mode confinement than with positive
δ
. Recent experiments in the TCV and DIII-D tokamaks have correlated the confinement improvement to a reduction of fluctuations within the plasma core. We report on fluctuation measurements in the scrape-off layer (SOL) for −0.61 <
δ
< +0.64 in limited and diverted ohmic L-mode plasmas; these reveal a strong reduction in SOL fluctuation amplitudes at
δ
≲ −0.25, and, surprisingly, an almost full suppression of plasma interaction with the main-chamber first-wall, which could have important implications for the prospects of using negative
δ
plasmas as a reactor solution. An exploration of several physical mechanisms suggests that a reduced connection length—intrinsic to negative
δ
plasmas—plays a critical role in the origin of this phenomenon.</abstract><cop>United States</cop><pub>IOP Science</pub><doi>10.1088/1741-4326/abdb95</doi><orcidid>https://orcid.org/0000-0002-7554-813X</orcidid><orcidid>https://orcid.org/0000-0002-7346-8312</orcidid><orcidid>https://orcid.org/0000-0003-3926-1374</orcidid><orcidid>https://orcid.org/0000-0002-0898-5217</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Nuclear fusion, 2021-03, Vol.61 (3), p.34003 |
| issn | 0029-5515 1741-4326 |
| language | eng |
| recordid | cdi_osti_scitechconnect_1777485 |
| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY Fluctuations Magnetic fusion energy Negative triangularity Tokamaks |
| title | Suppression of first-wall interaction in negative triangularity plasmas on TCV |
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