Global gyrokinetic simulation of turbulence driven by kinetic ballooning mode
Nonlinear evolution of the kinetic ballooning mode (KBM) is investigated by extending the global toroidal gyrokinetic simulation code (GKNET) to an electromagnetic regime. It is found that the saturation process of KBM, which is unstable at high normalized pressure β, is significantly different from...
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| Veröffentlicht in: | Physics of plasmas 2019-08, Vol.26 (8) |
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| creator | Ishizawa, A. Imadera, K. Nakamura, Y. Kishimoto, Y. |
| description | Nonlinear evolution of the kinetic ballooning mode (KBM) is investigated by extending the global toroidal gyrokinetic simulation code (GKNET) to an electromagnetic regime. It is found that the saturation process of KBM, which is unstable at high normalized pressure β, is significantly different from the ion temperature gradient (ITG) mode, which is unstable at low β. The KBMs get saturated by producing zonal flows and zonal magnetic fields. The production of zonal flow is weak in the initial saturation phase of KBM, which is in contrast to the ITG mode which produces strong zonal flows in the initial saturation phase. However, strong zonal flows are produced in the subsequent evolution of KBM, and a quasisteady state of KBM turbulence is established. In addition to the zonal flows, some low toroidal number modes, which are linearly stable against the KBM, dominate the KBM turbulence. The strong zonal magnetic field is also produced by the KBM. These zonal modes regulate the KBM turbulence. |
| doi_str_mv | 10.1063/1.5100308 |
| format | Article |
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It is found that the saturation process of KBM, which is unstable at high normalized pressure β, is significantly different from the ion temperature gradient (ITG) mode, which is unstable at low β. The KBMs get saturated by producing zonal flows and zonal magnetic fields. The production of zonal flow is weak in the initial saturation phase of KBM, which is in contrast to the ITG mode which produces strong zonal flows in the initial saturation phase. However, strong zonal flows are produced in the subsequent evolution of KBM, and a quasisteady state of KBM turbulence is established. In addition to the zonal flows, some low toroidal number modes, which are linearly stable against the KBM, dominate the KBM turbulence. The strong zonal magnetic field is also produced by the KBM. These zonal modes regulate the KBM turbulence.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.5100308</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Evolution ; Fluid dynamics ; Ion temperature ; Magnetic fields ; Plasma physics ; Quasi-steady states ; Saturation ; Temperature gradients ; Turbulence ; Zonal flow (meteorology)</subject><ispartof>Physics of plasmas, 2019-08, Vol.26 (8)</ispartof><rights>Author(s)</rights><rights>2019 Author(s). 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It is found that the saturation process of KBM, which is unstable at high normalized pressure β, is significantly different from the ion temperature gradient (ITG) mode, which is unstable at low β. The KBMs get saturated by producing zonal flows and zonal magnetic fields. The production of zonal flow is weak in the initial saturation phase of KBM, which is in contrast to the ITG mode which produces strong zonal flows in the initial saturation phase. However, strong zonal flows are produced in the subsequent evolution of KBM, and a quasisteady state of KBM turbulence is established. In addition to the zonal flows, some low toroidal number modes, which are linearly stable against the KBM, dominate the KBM turbulence. The strong zonal magnetic field is also produced by the KBM. These zonal modes regulate the KBM turbulence.</description><subject>Evolution</subject><subject>Fluid dynamics</subject><subject>Ion temperature</subject><subject>Magnetic fields</subject><subject>Plasma physics</subject><subject>Quasi-steady states</subject><subject>Saturation</subject><subject>Temperature gradients</subject><subject>Turbulence</subject><subject>Zonal flow (meteorology)</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqd0E1LAzEQBuAgCtbqwX8Q8KSwdfKxye5Rilah4kXBW8juJiV1m9Rkt9B_362tePc0c3jeGWYQuiYwISDYPZnkBIBBcYJGBIoyk0Ly030vIROCf56ji5SWAMBFXozQ66wNlW7xYhvDl_OmczVObtW3unPB42Bx18eqb42vDW6i2xiPqy3-pUO0DcE7v8Cr0JhLdGZ1m8zVsY7Rx9Pj-_Q5m7_NXqYP86zmknYZtbIsGyGtIZUsrZQVbxhhOaEcoGCkoBS45rIWUDaGU51r0FpzRkrDc8LYGN0c5q5j-O5N6tQy9NEPKxWloiiGOOzV7UHVMaQUjVXr6FY6bhUBtf-WIur4rcHeHWyqXfdz-__wJsQ_qNaNZTupLHc7</recordid><startdate>201908</startdate><enddate>201908</enddate><creator>Ishizawa, A.</creator><creator>Imadera, K.</creator><creator>Nakamura, Y.</creator><creator>Kishimoto, Y.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>201908</creationdate><title>Global gyrokinetic simulation of turbulence driven by kinetic ballooning mode</title><author>Ishizawa, A. ; Imadera, K. ; Nakamura, Y. ; Kishimoto, Y.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c472t-2f799d67fe1b79f77b4d31351240083182204a47c609de42a5a0aaa4319e45133</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Evolution</topic><topic>Fluid dynamics</topic><topic>Ion temperature</topic><topic>Magnetic fields</topic><topic>Plasma physics</topic><topic>Quasi-steady states</topic><topic>Saturation</topic><topic>Temperature gradients</topic><topic>Turbulence</topic><topic>Zonal flow (meteorology)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ishizawa, A.</creatorcontrib><creatorcontrib>Imadera, K.</creatorcontrib><creatorcontrib>Nakamura, Y.</creatorcontrib><creatorcontrib>Kishimoto, Y.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ishizawa, A.</au><au>Imadera, K.</au><au>Nakamura, Y.</au><au>Kishimoto, Y.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Global gyrokinetic simulation of turbulence driven by kinetic ballooning mode</atitle><jtitle>Physics of plasmas</jtitle><date>2019-08</date><risdate>2019</risdate><volume>26</volume><issue>8</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>Nonlinear evolution of the kinetic ballooning mode (KBM) is investigated by extending the global toroidal gyrokinetic simulation code (GKNET) to an electromagnetic regime. It is found that the saturation process of KBM, which is unstable at high normalized pressure β, is significantly different from the ion temperature gradient (ITG) mode, which is unstable at low β. The KBMs get saturated by producing zonal flows and zonal magnetic fields. The production of zonal flow is weak in the initial saturation phase of KBM, which is in contrast to the ITG mode which produces strong zonal flows in the initial saturation phase. However, strong zonal flows are produced in the subsequent evolution of KBM, and a quasisteady state of KBM turbulence is established. In addition to the zonal flows, some low toroidal number modes, which are linearly stable against the KBM, dominate the KBM turbulence. The strong zonal magnetic field is also produced by the KBM. These zonal modes regulate the KBM turbulence.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.5100308</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Evolution Fluid dynamics Ion temperature Magnetic fields Plasma physics Quasi-steady states Saturation Temperature gradients Turbulence Zonal flow (meteorology) |
| title | Global gyrokinetic simulation of turbulence driven by kinetic ballooning mode |
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