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Bispectral analysis of low- to high-confinement mode transitions in the National Spherical Torus Experiment
This paper will present an experimental study of the temporal and spatial characteristics of the autobicoherence calculated from light amplitude fluctuations measured in the edge plasma of the National Spherical Torus Experiment (NSTX) [M. Ono et al. , Plasma Phys. Controlled Fusion 45, A335 (2003)]...
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| Published in: | Physics of plasmas 2006-07, Vol.13 (7) |
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| Main Authors: | , , , , , , |
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| cited_by | cdi_FETCH-LOGICAL-c362t-e85cb76cca2fe1a024621802c1d4187529e78beb79c6087aa691b7256f9a90bc3 |
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| cites | cdi_FETCH-LOGICAL-c362t-e85cb76cca2fe1a024621802c1d4187529e78beb79c6087aa691b7256f9a90bc3 |
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| container_issue | 7 |
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| container_title | Physics of plasmas |
| container_volume | 13 |
| creator | White, A. E. Zweben, S. J. Burin, M. J. Carter, T. A. Hahm, T. S. Krommes, J. A. Maqueda, R. J. |
| description | This paper will present an experimental study of the temporal and spatial characteristics of the autobicoherence calculated from light amplitude fluctuations measured in the edge plasma of the National Spherical Torus Experiment (NSTX) [M. Ono
et al.
, Plasma Phys. Controlled Fusion
45, A335 (2003)] using data from the gas puff imaging (GPI) diagnostic [R. J. Maqueda
et al.
, Rev. Sci. Instrum.
74, 2020 (2003); S. J. Zweben
et al.
, Nucl. Fusion
44, 134 (2004)] obtained during a series of thirteen shots in which the NSTX plasma underwent spontaneous low- to high-confinement mode (L-H) transitions. The autobicoherence calculated from the available GPI chord signals in the region near the magnetic separatrix and just above the outer midplane indicates that there is no significant increase, i.e., outside the rms error, in the amount of nonlinear coupling between low frequency fluctuations and high frequency fluctuations during the
10
ms
before the transition. Limitations of bicoherence analysis are discussed. |
| doi_str_mv | 10.1063/1.2215439 |
| format | article |
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et al.
, Plasma Phys. Controlled Fusion
45, A335 (2003)] using data from the gas puff imaging (GPI) diagnostic [R. J. Maqueda
et al.
, Rev. Sci. Instrum.
74, 2020 (2003); S. J. Zweben
et al.
, Nucl. Fusion
44, 134 (2004)] obtained during a series of thirteen shots in which the NSTX plasma underwent spontaneous low- to high-confinement mode (L-H) transitions. The autobicoherence calculated from the available GPI chord signals in the region near the magnetic separatrix and just above the outer midplane indicates that there is no significant increase, i.e., outside the rms error, in the amount of nonlinear coupling between low frequency fluctuations and high frequency fluctuations during the
10
ms
before the transition. Limitations of bicoherence analysis are discussed.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.2215439</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>United States</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; AMPLITUDES ; BOUNDARY LAYERS ; COUPLING ; ERRORS ; FLUCTUATIONS ; NONLINEAR PROBLEMS ; NSTX DEVICE ; PLASMA ; PLASMA CONFINEMENT ; PLASMA DIAGNOSTICS ; SIGNALS ; VISIBLE RADIATION</subject><ispartof>Physics of plasmas, 2006-07, Vol.13 (7)</ispartof><rights>American Institute of Physics</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c362t-e85cb76cca2fe1a024621802c1d4187529e78beb79c6087aa691b7256f9a90bc3</citedby><cites>FETCH-LOGICAL-c362t-e85cb76cca2fe1a024621802c1d4187529e78beb79c6087aa691b7256f9a90bc3</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/10.1063/1.2215439$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>230,314,780,782,784,795,885,27924,27925,76383</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/20860116$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>White, A. E.</creatorcontrib><creatorcontrib>Zweben, S. J.</creatorcontrib><creatorcontrib>Burin, M. J.</creatorcontrib><creatorcontrib>Carter, T. A.</creatorcontrib><creatorcontrib>Hahm, T. S.</creatorcontrib><creatorcontrib>Krommes, J. A.</creatorcontrib><creatorcontrib>Maqueda, R. J.</creatorcontrib><title>Bispectral analysis of low- to high-confinement mode transitions in the National Spherical Torus Experiment</title><title>Physics of plasmas</title><description>This paper will present an experimental study of the temporal and spatial characteristics of the autobicoherence calculated from light amplitude fluctuations measured in the edge plasma of the National Spherical Torus Experiment (NSTX) [M. Ono
et al.
, Plasma Phys. Controlled Fusion
45, A335 (2003)] using data from the gas puff imaging (GPI) diagnostic [R. J. Maqueda
et al.
, Rev. Sci. Instrum.
74, 2020 (2003); S. J. Zweben
et al.
, Nucl. Fusion
44, 134 (2004)] obtained during a series of thirteen shots in which the NSTX plasma underwent spontaneous low- to high-confinement mode (L-H) transitions. The autobicoherence calculated from the available GPI chord signals in the region near the magnetic separatrix and just above the outer midplane indicates that there is no significant increase, i.e., outside the rms error, in the amount of nonlinear coupling between low frequency fluctuations and high frequency fluctuations during the
10
ms
before the transition. Limitations of bicoherence analysis are discussed.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>AMPLITUDES</subject><subject>BOUNDARY LAYERS</subject><subject>COUPLING</subject><subject>ERRORS</subject><subject>FLUCTUATIONS</subject><subject>NONLINEAR PROBLEMS</subject><subject>NSTX DEVICE</subject><subject>PLASMA</subject><subject>PLASMA CONFINEMENT</subject><subject>PLASMA DIAGNOSTICS</subject><subject>SIGNALS</subject><subject>VISIBLE RADIATION</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNqdkEtLxDAUhYMoOI4u_AcBVwodk7RN0qUO4wMGXTiCu5CmqY12kpLEx_x7U2fAvat7Lnz3cM8B4BSjGUY0v8QzQnBZ5NUemGDEq4xRVuyPmqGM0uLlEByF8IYQKmjJJ-D92oRBq-hlD6WV_SaYAF0Le_eVwehgZ167TDnbGqvX2ka4do2GCbfBRONsgMbC2Gn4IMc1uTwNnfZGJbVy_iPAxfeQ9vH2GBy0sg_6ZDen4PlmsZrfZcvH2_v51TJTOSUx07xUNaNKSdJqLBEpKMEcEYWbAnNWkkozXuuaVYoizqSkFa4ZKWlbyQrVKp-Cs62vC9GIoEzUqksZbMopCOIUYUwTdb6llHcheN2KIb0p_UZgJMYuBRa7LhN7sWVHs9-g_4M_nf8DxdC0-Q95jYNf</recordid><startdate>20060701</startdate><enddate>20060701</enddate><creator>White, A. E.</creator><creator>Zweben, S. J.</creator><creator>Burin, M. J.</creator><creator>Carter, T. A.</creator><creator>Hahm, T. S.</creator><creator>Krommes, J. A.</creator><creator>Maqueda, R. J.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20060701</creationdate><title>Bispectral analysis of low- to high-confinement mode transitions in the National Spherical Torus Experiment</title><author>White, A. E. ; Zweben, S. J. ; Burin, M. J. ; Carter, T. A. ; Hahm, T. S. ; Krommes, J. A. ; Maqueda, R. J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c362t-e85cb76cca2fe1a024621802c1d4187529e78beb79c6087aa691b7256f9a90bc3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><topic>AMPLITUDES</topic><topic>BOUNDARY LAYERS</topic><topic>COUPLING</topic><topic>ERRORS</topic><topic>FLUCTUATIONS</topic><topic>NONLINEAR PROBLEMS</topic><topic>NSTX DEVICE</topic><topic>PLASMA</topic><topic>PLASMA CONFINEMENT</topic><topic>PLASMA DIAGNOSTICS</topic><topic>SIGNALS</topic><topic>VISIBLE RADIATION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>White, A. E.</creatorcontrib><creatorcontrib>Zweben, S. J.</creatorcontrib><creatorcontrib>Burin, M. J.</creatorcontrib><creatorcontrib>Carter, T. A.</creatorcontrib><creatorcontrib>Hahm, T. S.</creatorcontrib><creatorcontrib>Krommes, J. A.</creatorcontrib><creatorcontrib>Maqueda, R. J.</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>White, A. E.</au><au>Zweben, S. J.</au><au>Burin, M. J.</au><au>Carter, T. A.</au><au>Hahm, T. S.</au><au>Krommes, J. A.</au><au>Maqueda, R. J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Bispectral analysis of low- to high-confinement mode transitions in the National Spherical Torus Experiment</atitle><jtitle>Physics of plasmas</jtitle><date>2006-07-01</date><risdate>2006</risdate><volume>13</volume><issue>7</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>This paper will present an experimental study of the temporal and spatial characteristics of the autobicoherence calculated from light amplitude fluctuations measured in the edge plasma of the National Spherical Torus Experiment (NSTX) [M. Ono
et al.
, Plasma Phys. Controlled Fusion
45, A335 (2003)] using data from the gas puff imaging (GPI) diagnostic [R. J. Maqueda
et al.
, Rev. Sci. Instrum.
74, 2020 (2003); S. J. Zweben
et al.
, Nucl. Fusion
44, 134 (2004)] obtained during a series of thirteen shots in which the NSTX plasma underwent spontaneous low- to high-confinement mode (L-H) transitions. The autobicoherence calculated from the available GPI chord signals in the region near the magnetic separatrix and just above the outer midplane indicates that there is no significant increase, i.e., outside the rms error, in the amount of nonlinear coupling between low frequency fluctuations and high frequency fluctuations during the
10
ms
before the transition. Limitations of bicoherence analysis are discussed.</abstract><cop>United States</cop><doi>10.1063/1.2215439</doi><tpages>14</tpages><oa>free_for_read</oa></addata></record> |
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| source | American Institute of Physics (AIP) Publications; American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list) |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY AMPLITUDES BOUNDARY LAYERS COUPLING ERRORS FLUCTUATIONS NONLINEAR PROBLEMS NSTX DEVICE PLASMA PLASMA CONFINEMENT PLASMA DIAGNOSTICS SIGNALS VISIBLE RADIATION |
| title | Bispectral analysis of low- to high-confinement mode transitions in the National Spherical Torus Experiment |
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