Demonstration of high‐performance negative central magnetic shear discharges in the DIII‐D tokamak
Reliable operation of discharges with negative central magnetic shear has led to significant increases in plasma performance and reactivity in both low confinement, L‐mode, and high confinement, H‐mode, regimes in the DIII‐D tokamak [Plasma Physics and Controlled Nuclear Fusion Research 1986 (Intern...
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| Veröffentlicht in: | Physics of Plasmas 1996-05, Vol.3 (5), p.1983-1991 |
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| creator | Rice, B. W. Burrell, K. H. Lao, L. L. Navratil, G. Stallard, B. W. Strait, E. J. Taylor, T. S. Austin, M. E. Casper, T. A. Chu, M. S. Forest, C. B. Gohil, P. Groebner, R. J. Heidbrink, W. W. Hyatt, A. W. Ikezi, H. La Haye, R. J. Lazarus, E. A. Lin‐Liu, Y. R. Mauel, M. E. Meyer, W. H. Rettig, C. L. Schissel, D. P. St. John, H. E. Taylor, P. L. Turnbull, A. D. |
| description | Reliable operation of discharges with negative central magnetic shear has led to significant increases in plasma performance and reactivity in both low confinement, L‐mode, and high confinement, H‐mode, regimes in the DIII‐D tokamak [Plasma
Physics
and
Controlled
Nuclear
Fusion
Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159]. Using neutral beam injection early in the initial current ramp, a large range of negative shear discharges have been produced with durations lasting up to 3.2 s. The total noninductive current (beam plus bootstrap) ranges from 50% to 80% in these discharges. In the region of shear reversal, significant peaking of the toroidal rotation [f
φ(0)∼30–60 kHz] and ion temperature [T
i
(0)∼15–22 keV] profiles are observed. In high‐power discharges with an L‐mode edge, peaked density profiles are also observed. Confinement enhancement factors up to H≡τ
E
/τITER‐89P∼2.5 with an L‐mode edge, and H∼3.3 in an edge localized mode (ELM)‐free H mode, are obtained. Transport analysis shows both ion thermal diffusivity and particle diffusivity to be near or below standard neoclassical values in the core. Large pressure peaking in the L mode leads to high disruptivity with β
N
≡β
T
/(I/aB)≤2.3, while broader pressure profiles in the H mode gives low disruptivity with β
N
≤4.2. |
| doi_str_mv | 10.1063/1.871994 |
| format | Article |
| fullrecord | <record><control><sourceid>scitation_cross</sourceid><recordid>TN_cdi_crossref_primary_10_1063_1_871994</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>pop</sourcerecordid><originalsourceid>FETCH-LOGICAL-c421t-2bbf530b6265a831603c8f7c407bca1526c81b8787330bdbe12e43907985c0cd3</originalsourceid><addsrcrecordid>eNp90E9LwzAcxvEgCs4p-BLiTQ-dSZMm6VE2_wwGXhS8hTRN27g1GUkYePMl-Bp9JXZWvAie8oN8-B4eAM4xmmHEyDWeCY7Lkh6ACUaizDjj9HB_c5QxRl-OwUmMrwghygoxAc3C9N7FFFSy3kHfwM623ef7x9aExodeOW2gM-3wvTNQGzfIDexV60yyGsbOqABrG3WnQmsitA6mzsDFcrkcIguY_Fr1an0Kjhq1iebs552C57vbp_lDtnq8X85vVpmmOU5ZXlVNQVDFclYoQTBDRIuGa4p4pRUucqYFrgQXnAyqrgzODSUl4qUoNNI1mYKLsetjsjJqm4zutHfO6CRzQSgWg7kcjQ4-xmAauQ22V-FNYiT3G0osxw0HejXSfel7oV-78-HXyW3d_Gf_dL8AzeiBhw</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Demonstration of high‐performance negative central magnetic shear discharges in the DIII‐D tokamak</title><source>AIP Digital Archive</source><creator>Rice, B. W. ; Burrell, K. H. ; Lao, L. L. ; Navratil, G. ; Stallard, B. W. ; Strait, E. J. ; Taylor, T. S. ; Austin, M. E. ; Casper, T. A. ; Chu, M. S. ; Forest, C. B. ; Gohil, P. ; Groebner, R. J. ; Heidbrink, W. W. ; Hyatt, A. W. ; Ikezi, H. ; La Haye, R. J. ; Lazarus, E. A. ; Lin‐Liu, Y. R. ; Mauel, M. E. ; Meyer, W. H. ; Rettig, C. L. ; Schissel, D. P. ; St. John, H. E. ; Taylor, P. L. ; Turnbull, A. D.</creator><creatorcontrib>Rice, B. W. ; Burrell, K. H. ; Lao, L. L. ; Navratil, G. ; Stallard, B. W. ; Strait, E. J. ; Taylor, T. S. ; Austin, M. E. ; Casper, T. A. ; Chu, M. S. ; Forest, C. B. ; Gohil, P. ; Groebner, R. J. ; Heidbrink, W. W. ; Hyatt, A. W. ; Ikezi, H. ; La Haye, R. J. ; Lazarus, E. A. ; Lin‐Liu, Y. R. ; Mauel, M. E. ; Meyer, W. H. ; Rettig, C. L. ; Schissel, D. P. ; St. John, H. E. ; Taylor, P. L. ; Turnbull, A. D. ; the DIII-D Team ; General Atomics</creatorcontrib><description>Reliable operation of discharges with negative central magnetic shear has led to significant increases in plasma performance and reactivity in both low confinement, L‐mode, and high confinement, H‐mode, regimes in the DIII‐D tokamak [Plasma
Physics
and
Controlled
Nuclear
Fusion
Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159]. Using neutral beam injection early in the initial current ramp, a large range of negative shear discharges have been produced with durations lasting up to 3.2 s. The total noninductive current (beam plus bootstrap) ranges from 50% to 80% in these discharges. In the region of shear reversal, significant peaking of the toroidal rotation [f
φ(0)∼30–60 kHz] and ion temperature [T
i
(0)∼15–22 keV] profiles are observed. In high‐power discharges with an L‐mode edge, peaked density profiles are also observed. Confinement enhancement factors up to H≡τ
E
/τITER‐89P∼2.5 with an L‐mode edge, and H∼3.3 in an edge localized mode (ELM)‐free H mode, are obtained. Transport analysis shows both ion thermal diffusivity and particle diffusivity to be near or below standard neoclassical values in the core. Large pressure peaking in the L mode leads to high disruptivity with β
N
≡β
T
/(I/aB)≤2.3, while broader pressure profiles in the H mode gives low disruptivity with β
N
≤4.2.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.871994</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>United States</publisher><subject>70 PLASMA PHYSICS AND FUSION ; BOOTSTRAP CURRENT ; DOUBLET-3 DEVICE ; H-MODE PLASMA CONFINEMENT ; HIGH-BETA PLASMA ; PLASMA HEATING ; TOKAMAK DEVICES</subject><ispartof>Physics of Plasmas, 1996-05, Vol.3 (5), p.1983-1991</ispartof><rights>American Institute of Physics</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c421t-2bbf530b6265a831603c8f7c407bca1526c81b8787330bdbe12e43907985c0cd3</citedby><cites>FETCH-LOGICAL-c421t-2bbf530b6265a831603c8f7c407bca1526c81b8787330bdbe12e43907985c0cd3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/pop/article-lookup/doi/10.1063/1.871994$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>314,776,780,881,1553,27901,27902,76132</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/283418$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Rice, B. W.</creatorcontrib><creatorcontrib>Burrell, K. H.</creatorcontrib><creatorcontrib>Lao, L. L.</creatorcontrib><creatorcontrib>Navratil, G.</creatorcontrib><creatorcontrib>Stallard, B. W.</creatorcontrib><creatorcontrib>Strait, E. J.</creatorcontrib><creatorcontrib>Taylor, T. S.</creatorcontrib><creatorcontrib>Austin, M. E.</creatorcontrib><creatorcontrib>Casper, T. A.</creatorcontrib><creatorcontrib>Chu, M. S.</creatorcontrib><creatorcontrib>Forest, C. B.</creatorcontrib><creatorcontrib>Gohil, P.</creatorcontrib><creatorcontrib>Groebner, R. J.</creatorcontrib><creatorcontrib>Heidbrink, W. W.</creatorcontrib><creatorcontrib>Hyatt, A. W.</creatorcontrib><creatorcontrib>Ikezi, H.</creatorcontrib><creatorcontrib>La Haye, R. J.</creatorcontrib><creatorcontrib>Lazarus, E. A.</creatorcontrib><creatorcontrib>Lin‐Liu, Y. R.</creatorcontrib><creatorcontrib>Mauel, M. E.</creatorcontrib><creatorcontrib>Meyer, W. H.</creatorcontrib><creatorcontrib>Rettig, C. L.</creatorcontrib><creatorcontrib>Schissel, D. P.</creatorcontrib><creatorcontrib>St. John, H. E.</creatorcontrib><creatorcontrib>Taylor, P. L.</creatorcontrib><creatorcontrib>Turnbull, A. D.</creatorcontrib><creatorcontrib>the DIII-D Team</creatorcontrib><creatorcontrib>General Atomics</creatorcontrib><title>Demonstration of high‐performance negative central magnetic shear discharges in the DIII‐D tokamak</title><title>Physics of Plasmas</title><description>Reliable operation of discharges with negative central magnetic shear has led to significant increases in plasma performance and reactivity in both low confinement, L‐mode, and high confinement, H‐mode, regimes in the DIII‐D tokamak [Plasma
Physics
and
Controlled
Nuclear
Fusion
Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159]. Using neutral beam injection early in the initial current ramp, a large range of negative shear discharges have been produced with durations lasting up to 3.2 s. The total noninductive current (beam plus bootstrap) ranges from 50% to 80% in these discharges. In the region of shear reversal, significant peaking of the toroidal rotation [f
φ(0)∼30–60 kHz] and ion temperature [T
i
(0)∼15–22 keV] profiles are observed. In high‐power discharges with an L‐mode edge, peaked density profiles are also observed. Confinement enhancement factors up to H≡τ
E
/τITER‐89P∼2.5 with an L‐mode edge, and H∼3.3 in an edge localized mode (ELM)‐free H mode, are obtained. Transport analysis shows both ion thermal diffusivity and particle diffusivity to be near or below standard neoclassical values in the core. Large pressure peaking in the L mode leads to high disruptivity with β
N
≡β
T
/(I/aB)≤2.3, while broader pressure profiles in the H mode gives low disruptivity with β
N
≤4.2.</description><subject>70 PLASMA PHYSICS AND FUSION</subject><subject>BOOTSTRAP CURRENT</subject><subject>DOUBLET-3 DEVICE</subject><subject>H-MODE PLASMA CONFINEMENT</subject><subject>HIGH-BETA PLASMA</subject><subject>PLASMA HEATING</subject><subject>TOKAMAK DEVICES</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNp90E9LwzAcxvEgCs4p-BLiTQ-dSZMm6VE2_wwGXhS8hTRN27g1GUkYePMl-Bp9JXZWvAie8oN8-B4eAM4xmmHEyDWeCY7Lkh6ACUaizDjj9HB_c5QxRl-OwUmMrwghygoxAc3C9N7FFFSy3kHfwM623ef7x9aExodeOW2gM-3wvTNQGzfIDexV60yyGsbOqABrG3WnQmsitA6mzsDFcrkcIguY_Fr1an0Kjhq1iebs552C57vbp_lDtnq8X85vVpmmOU5ZXlVNQVDFclYoQTBDRIuGa4p4pRUucqYFrgQXnAyqrgzODSUl4qUoNNI1mYKLsetjsjJqm4zutHfO6CRzQSgWg7kcjQ4-xmAauQ22V-FNYiT3G0osxw0HejXSfel7oV-78-HXyW3d_Gf_dL8AzeiBhw</recordid><startdate>19960501</startdate><enddate>19960501</enddate><creator>Rice, B. W.</creator><creator>Burrell, K. H.</creator><creator>Lao, L. L.</creator><creator>Navratil, G.</creator><creator>Stallard, B. W.</creator><creator>Strait, E. J.</creator><creator>Taylor, T. S.</creator><creator>Austin, M. E.</creator><creator>Casper, T. A.</creator><creator>Chu, M. S.</creator><creator>Forest, C. B.</creator><creator>Gohil, P.</creator><creator>Groebner, R. J.</creator><creator>Heidbrink, W. W.</creator><creator>Hyatt, A. W.</creator><creator>Ikezi, H.</creator><creator>La Haye, R. J.</creator><creator>Lazarus, E. A.</creator><creator>Lin‐Liu, Y. R.</creator><creator>Mauel, M. E.</creator><creator>Meyer, W. H.</creator><creator>Rettig, C. L.</creator><creator>Schissel, D. P.</creator><creator>St. John, H. E.</creator><creator>Taylor, P. L.</creator><creator>Turnbull, A. D.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>19960501</creationdate><title>Demonstration of high‐performance negative central magnetic shear discharges in the DIII‐D tokamak</title><author>Rice, B. W. ; Burrell, K. H. ; Lao, L. L. ; Navratil, G. ; Stallard, B. W. ; Strait, E. J. ; Taylor, T. S. ; Austin, M. E. ; Casper, T. A. ; Chu, M. S. ; Forest, C. B. ; Gohil, P. ; Groebner, R. J. ; Heidbrink, W. W. ; Hyatt, A. W. ; Ikezi, H. ; La Haye, R. J. ; Lazarus, E. A. ; Lin‐Liu, Y. R. ; Mauel, M. E. ; Meyer, W. H. ; Rettig, C. L. ; Schissel, D. P. ; St. John, H. E. ; Taylor, P. L. ; Turnbull, A. 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D.</creatorcontrib><creatorcontrib>the DIII-D Team</creatorcontrib><creatorcontrib>General Atomics</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Physics of Plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rice, B. W.</au><au>Burrell, K. H.</au><au>Lao, L. L.</au><au>Navratil, G.</au><au>Stallard, B. W.</au><au>Strait, E. J.</au><au>Taylor, T. S.</au><au>Austin, M. E.</au><au>Casper, T. A.</au><au>Chu, M. S.</au><au>Forest, C. B.</au><au>Gohil, P.</au><au>Groebner, R. J.</au><au>Heidbrink, W. W.</au><au>Hyatt, A. W.</au><au>Ikezi, H.</au><au>La Haye, R. J.</au><au>Lazarus, E. A.</au><au>Lin‐Liu, Y. R.</au><au>Mauel, M. E.</au><au>Meyer, W. H.</au><au>Rettig, C. L.</au><au>Schissel, D. P.</au><au>St. John, H. E.</au><au>Taylor, P. L.</au><au>Turnbull, A. D.</au><aucorp>the DIII-D Team</aucorp><aucorp>General Atomics</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Demonstration of high‐performance negative central magnetic shear discharges in the DIII‐D tokamak</atitle><jtitle>Physics of Plasmas</jtitle><date>1996-05-01</date><risdate>1996</risdate><volume>3</volume><issue>5</issue><spage>1983</spage><epage>1991</epage><pages>1983-1991</pages><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>Reliable operation of discharges with negative central magnetic shear has led to significant increases in plasma performance and reactivity in both low confinement, L‐mode, and high confinement, H‐mode, regimes in the DIII‐D tokamak [Plasma
Physics
and
Controlled
Nuclear
Fusion
Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159]. Using neutral beam injection early in the initial current ramp, a large range of negative shear discharges have been produced with durations lasting up to 3.2 s. The total noninductive current (beam plus bootstrap) ranges from 50% to 80% in these discharges. In the region of shear reversal, significant peaking of the toroidal rotation [f
φ(0)∼30–60 kHz] and ion temperature [T
i
(0)∼15–22 keV] profiles are observed. In high‐power discharges with an L‐mode edge, peaked density profiles are also observed. Confinement enhancement factors up to H≡τ
E
/τITER‐89P∼2.5 with an L‐mode edge, and H∼3.3 in an edge localized mode (ELM)‐free H mode, are obtained. Transport analysis shows both ion thermal diffusivity and particle diffusivity to be near or below standard neoclassical values in the core. Large pressure peaking in the L mode leads to high disruptivity with β
N
≡β
T
/(I/aB)≤2.3, while broader pressure profiles in the H mode gives low disruptivity with β
N
≤4.2.</abstract><cop>United States</cop><doi>10.1063/1.871994</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1070-664X |
| ispartof | Physics of Plasmas, 1996-05, Vol.3 (5), p.1983-1991 |
| issn | 1070-664X 1089-7674 |
| language | eng |
| recordid | cdi_crossref_primary_10_1063_1_871994 |
| source | AIP Digital Archive |
| subjects | 70 PLASMA PHYSICS AND FUSION BOOTSTRAP CURRENT DOUBLET-3 DEVICE H-MODE PLASMA CONFINEMENT HIGH-BETA PLASMA PLASMA HEATING TOKAMAK DEVICES |
| title | Demonstration of high‐performance negative central magnetic shear discharges in the DIII‐D tokamak |
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