Measurement of core velocity fluctuations and the dynamo in a reversed-field pinch
Plasma flow velocity fluctuations have been directly measured in the high-temperature magnetically confined plasma in the Madison Symmetric Torus (MST) Reversed-Field Pinch (RFP) [R. N. Dexter et al., Fusion Technol. 19, 131 (1991)]. These measurements show that the flow velocity fluctuations are co...
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| Veröffentlicht in: | Physics of Plasmas 1999-05, Vol.6 (5), p.1813-1821 |
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| creator | Den Hartog, D. J. Chapman, J. T. Craig, D. Fiksel, G. Fontana, P. W. Prager, S. C. Sarff, J. S. |
| description | Plasma flow velocity fluctuations have been directly measured in the high-temperature magnetically confined plasma in the Madison Symmetric Torus (MST) Reversed-Field Pinch (RFP) [R. N. Dexter et al., Fusion Technol. 19, 131 (1991)]. These measurements show that the flow velocity fluctuations are correlated with magnetic field fluctuations such that the electromotive force
〈
v
̃×
B̃
〉
approximately balances parallel Ohm’s law,
E
∥
+〈
ṽ×B̃
〉
∥
=ηJ
∥
.
This initial measurement is subject to limitations of spatial localization and other uncertainties, but is evidence for sustainment of the RFP magnetic field configuration by the magnetohydrodynamic (MHD) dynamo,
〈
ṽ×B̃
〉.
Both the flow velocity and magnetic field fluctuations are the result of global resistive MHD modes of helicity
m=1,
n=5–10
in the core of MST. Chord-averaged flow velocity fluctuations are measured in the core of MST by recording the Doppler shift of impurity line emission with a specialized high resolution and throughput grating spectrometer. Magnetic field fluctuations are recorded with a large array of small edge pickup coils, which allows spectral decomposition into discrete modes and subsequent correlation with the velocity fluctuation data. |
| doi_str_mv | 10.1063/1.873439 |
| format | Article |
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〈
v
̃×
B̃
〉
approximately balances parallel Ohm’s law,
E
∥
+〈
ṽ×B̃
〉
∥
=ηJ
∥
.
This initial measurement is subject to limitations of spatial localization and other uncertainties, but is evidence for sustainment of the RFP magnetic field configuration by the magnetohydrodynamic (MHD) dynamo,
〈
ṽ×B̃
〉.
Both the flow velocity and magnetic field fluctuations are the result of global resistive MHD modes of helicity
m=1,
n=5–10
in the core of MST. Chord-averaged flow velocity fluctuations are measured in the core of MST by recording the Doppler shift of impurity line emission with a specialized high resolution and throughput grating spectrometer. Magnetic field fluctuations are recorded with a large array of small edge pickup coils, which allows spectral decomposition into discrete modes and subsequent correlation with the velocity fluctuation data.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.873439</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>United States</publisher><subject>70 PLASMA PHYSICS AND FUSION ; MAGNETIC FIELD CONFIGURATIONS ; MAGNETOHYDRODYNAMICS ; MST DEVICE ; PLASMA DIAGNOSTICS ; PLASMA DRIFT ; PLASMA INSTABILITY ; PLASMA WAVES ; SAWTOOTH OSCILLATIONS</subject><ispartof>Physics of Plasmas, 1999-05, Vol.6 (5), p.1813-1821</ispartof><rights>American Institute of Physics</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c419t-c58b2de439b311a2ee4566e1954de1b33d4dc6a0dc499e210e953b7b5cfdd1623</citedby><cites>FETCH-LOGICAL-c419t-c58b2de439b311a2ee4566e1954de1b33d4dc6a0dc499e210e953b7b5cfdd1623</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/10.1063/1.873439$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>230,309,310,314,776,780,785,786,790,881,1553,4498,23909,23910,25118,27901,27902,76353,76359</link.rule.ids><backlink>$$Uhttps://www.osti.gov/servlets/purl/296833$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Den Hartog, D. J.</creatorcontrib><creatorcontrib>Chapman, J. T.</creatorcontrib><creatorcontrib>Craig, D.</creatorcontrib><creatorcontrib>Fiksel, G.</creatorcontrib><creatorcontrib>Fontana, P. W.</creatorcontrib><creatorcontrib>Prager, S. C.</creatorcontrib><creatorcontrib>Sarff, J. S.</creatorcontrib><creatorcontrib>Univ. of Wisconsin, Dept. of Physics, Madison, WI (United States)</creatorcontrib><title>Measurement of core velocity fluctuations and the dynamo in a reversed-field pinch</title><title>Physics of Plasmas</title><description>Plasma flow velocity fluctuations have been directly measured in the high-temperature magnetically confined plasma in the Madison Symmetric Torus (MST) Reversed-Field Pinch (RFP) [R. N. Dexter et al., Fusion Technol. 19, 131 (1991)]. These measurements show that the flow velocity fluctuations are correlated with magnetic field fluctuations such that the electromotive force
〈
v
̃×
B̃
〉
approximately balances parallel Ohm’s law,
E
∥
+〈
ṽ×B̃
〉
∥
=ηJ
∥
.
This initial measurement is subject to limitations of spatial localization and other uncertainties, but is evidence for sustainment of the RFP magnetic field configuration by the magnetohydrodynamic (MHD) dynamo,
〈
ṽ×B̃
〉.
Both the flow velocity and magnetic field fluctuations are the result of global resistive MHD modes of helicity
m=1,
n=5–10
in the core of MST. Chord-averaged flow velocity fluctuations are measured in the core of MST by recording the Doppler shift of impurity line emission with a specialized high resolution and throughput grating spectrometer. Magnetic field fluctuations are recorded with a large array of small edge pickup coils, which allows spectral decomposition into discrete modes and subsequent correlation with the velocity fluctuation data.</description><subject>70 PLASMA PHYSICS AND FUSION</subject><subject>MAGNETIC FIELD CONFIGURATIONS</subject><subject>MAGNETOHYDRODYNAMICS</subject><subject>MST DEVICE</subject><subject>PLASMA DIAGNOSTICS</subject><subject>PLASMA DRIFT</subject><subject>PLASMA INSTABILITY</subject><subject>PLASMA WAVES</subject><subject>SAWTOOTH OSCILLATIONS</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNqd0M9KxDAQBvAgCq6r4CPEmx66Jk2aNkdZ_Acrgih4C2kyYSvdZEnShX17u1Z8AE8zhx8f3wxCl5QsKBHsli6amnEmj9CMkkYWtaj58WGvSSEE_zxFZyl9EUK4qJoZensBnYYIG_AZB4dNiIB30AfT5T12_WDyoHMXfMLaW5zXgO3e603AnccaR9hBTGAL10Fv8bbzZn2OTpzuE1z8zjn6eLh_Xz4Vq9fH5-XdqjCcylyYqmlLC2PVllGqSwBeCQFUVtwCbRmz3BqhiTVcSigpAVmxtm4r46ylomRzdDXlhpQ7lcbCYNYmeA8mq1KKhrHRXE_GxJBSBKe2sdvouFeUqMO_FFXTv0Z6M9FD0s_J_7K7EP-c2lrHvgHCCnll</recordid><startdate>19990501</startdate><enddate>19990501</enddate><creator>Den Hartog, D. J.</creator><creator>Chapman, J. T.</creator><creator>Craig, D.</creator><creator>Fiksel, G.</creator><creator>Fontana, P. W.</creator><creator>Prager, S. C.</creator><creator>Sarff, J. S.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>OIOZB</scope><scope>OTOTI</scope></search><sort><creationdate>19990501</creationdate><title>Measurement of core velocity fluctuations and the dynamo in a reversed-field pinch</title><author>Den Hartog, D. J. ; Chapman, J. T. ; Craig, D. ; Fiksel, G. ; Fontana, P. W. ; Prager, S. C. ; Sarff, J. S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c419t-c58b2de439b311a2ee4566e1954de1b33d4dc6a0dc499e210e953b7b5cfdd1623</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>70 PLASMA PHYSICS AND FUSION</topic><topic>MAGNETIC FIELD CONFIGURATIONS</topic><topic>MAGNETOHYDRODYNAMICS</topic><topic>MST DEVICE</topic><topic>PLASMA DIAGNOSTICS</topic><topic>PLASMA DRIFT</topic><topic>PLASMA INSTABILITY</topic><topic>PLASMA WAVES</topic><topic>SAWTOOTH OSCILLATIONS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Den Hartog, D. J.</creatorcontrib><creatorcontrib>Chapman, J. T.</creatorcontrib><creatorcontrib>Craig, D.</creatorcontrib><creatorcontrib>Fiksel, G.</creatorcontrib><creatorcontrib>Fontana, P. W.</creatorcontrib><creatorcontrib>Prager, S. C.</creatorcontrib><creatorcontrib>Sarff, J. S.</creatorcontrib><creatorcontrib>Univ. of Wisconsin, Dept. of Physics, Madison, WI (United States)</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>Physics of Plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Den Hartog, D. J.</au><au>Chapman, J. T.</au><au>Craig, D.</au><au>Fiksel, G.</au><au>Fontana, P. W.</au><au>Prager, S. C.</au><au>Sarff, J. S.</au><aucorp>Univ. of Wisconsin, Dept. of Physics, Madison, WI (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Measurement of core velocity fluctuations and the dynamo in a reversed-field pinch</atitle><jtitle>Physics of Plasmas</jtitle><date>1999-05-01</date><risdate>1999</risdate><volume>6</volume><issue>5</issue><spage>1813</spage><epage>1821</epage><pages>1813-1821</pages><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>Plasma flow velocity fluctuations have been directly measured in the high-temperature magnetically confined plasma in the Madison Symmetric Torus (MST) Reversed-Field Pinch (RFP) [R. N. Dexter et al., Fusion Technol. 19, 131 (1991)]. These measurements show that the flow velocity fluctuations are correlated with magnetic field fluctuations such that the electromotive force
〈
v
̃×
B̃
〉
approximately balances parallel Ohm’s law,
E
∥
+〈
ṽ×B̃
〉
∥
=ηJ
∥
.
This initial measurement is subject to limitations of spatial localization and other uncertainties, but is evidence for sustainment of the RFP magnetic field configuration by the magnetohydrodynamic (MHD) dynamo,
〈
ṽ×B̃
〉.
Both the flow velocity and magnetic field fluctuations are the result of global resistive MHD modes of helicity
m=1,
n=5–10
in the core of MST. Chord-averaged flow velocity fluctuations are measured in the core of MST by recording the Doppler shift of impurity line emission with a specialized high resolution and throughput grating spectrometer. Magnetic field fluctuations are recorded with a large array of small edge pickup coils, which allows spectral decomposition into discrete modes and subsequent correlation with the velocity fluctuation data.</abstract><cop>United States</cop><doi>10.1063/1.873439</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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| source | AIP Journals Complete; AIP Digital Archive |
| subjects | 70 PLASMA PHYSICS AND FUSION MAGNETIC FIELD CONFIGURATIONS MAGNETOHYDRODYNAMICS MST DEVICE PLASMA DIAGNOSTICS PLASMA DRIFT PLASMA INSTABILITY PLASMA WAVES SAWTOOTH OSCILLATIONS |
| title | Measurement of core velocity fluctuations and the dynamo in a reversed-field pinch |
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