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    <identifier>10.57760/sciencedb.04801</identifier>
    <datestamp>2022-11-27T20:47:03Z</datestamp>
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<oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:date>2022-11-27</dc:date>
  <dc:title>Experimental investigation of lower hybrid current drive induced plasma rotation on the experimental advanced superconducting tokamak</dc:title>
  <dc:identifier>doi:10.57760/sciencedb.04801</dc:identifier>
  <dc:language>en</dc:language>
  <dc:description>Rotation&amp;nbsp;and&amp;nbsp;its&amp;nbsp;shear&amp;nbsp;can&amp;nbsp;reduce&amp;nbsp;the&amp;nbsp;magnetohydrodynamic&amp;nbsp;instabilities&amp;nbsp;and&amp;nbsp;enhance&amp;nbsp;the&amp;nbsp;confinement. The&amp;nbsp;LHCD&amp;nbsp;has&amp;nbsp;been&amp;nbsp;proposed&amp;nbsp;as&amp;nbsp;a&amp;nbsp;possible&amp;nbsp;means&amp;nbsp;of&amp;nbsp;rotation&amp;nbsp;driving&amp;nbsp;on&amp;nbsp;a&amp;nbsp;future&amp;nbsp;fusion&amp;nbsp;reactor.&amp;nbsp;Exploring&amp;nbsp;the mechanisms&amp;nbsp;of&amp;nbsp;LHCD&amp;nbsp;rotation&amp;nbsp;driving&amp;nbsp;on&amp;nbsp;the&amp;nbsp;current&amp;nbsp;tokamaks&amp;nbsp;can&amp;nbsp;provide&amp;nbsp;important&amp;nbsp;reference&amp;nbsp;for&amp;nbsp;future reactors.&amp;nbsp;On&amp;nbsp;EAST,&amp;nbsp;it&amp;nbsp;was&amp;nbsp;previously&amp;nbsp;shown&amp;nbsp;that&amp;nbsp;2.45&amp;nbsp;GHz&amp;nbsp;LHCD&amp;nbsp;can&amp;nbsp;drive&amp;nbsp;plasma&amp;nbsp;toroidal&amp;nbsp;rotation&amp;nbsp;and&amp;nbsp;the change&amp;nbsp;of&amp;nbsp;edge&amp;nbsp;plasma&amp;nbsp;rotation&amp;nbsp;leads&amp;nbsp;the&amp;nbsp;co-current&amp;nbsp;core&amp;nbsp;rotation&amp;nbsp;to&amp;nbsp;increase.&amp;nbsp;At&amp;nbsp;higher&amp;nbsp;frequency,&amp;nbsp;4.6&amp;nbsp;GHz lower&amp;nbsp;hybrid&amp;nbsp;wave&amp;nbsp;can&amp;nbsp;more&amp;nbsp;effectively&amp;nbsp;drive&amp;nbsp;co-current&amp;nbsp;plasma&amp;nbsp;toroidal&amp;nbsp;rotation.&amp;nbsp;On&amp;nbsp;EAST,&amp;nbsp;at&amp;nbsp;the&amp;nbsp;lower current,&amp;nbsp;the&amp;nbsp;effects&amp;nbsp;of&amp;nbsp;different&amp;nbsp;LHCD&amp;nbsp;power&amp;nbsp;on&amp;nbsp;plasma&amp;nbsp;toroidal&amp;nbsp;rotation&amp;nbsp;are&amp;nbsp;analyzed.&amp;nbsp;Higher&amp;nbsp;power&amp;nbsp;LHCD&amp;nbsp;has a&amp;nbsp;better&amp;nbsp;driving&amp;nbsp;efficiency.&amp;nbsp;The&amp;nbsp;effect&amp;nbsp;of&amp;nbsp;safety&amp;nbsp;factor&amp;nbsp;(q)&amp;nbsp;profile&amp;nbsp;on&amp;nbsp;toroidal&amp;nbsp;rotation&amp;nbsp;is&amp;nbsp;also&amp;nbsp;presented.&amp;nbsp;The LHCD&amp;nbsp;can&amp;nbsp;change&amp;nbsp;the&amp;nbsp;profile&amp;nbsp;of&amp;nbsp;safety&amp;nbsp;factor&amp;nbsp;due&amp;nbsp;to&amp;nbsp;current&amp;nbsp;drive.&amp;nbsp;It&amp;nbsp;is&amp;nbsp;found&amp;nbsp;that&amp;nbsp;when&amp;nbsp;the&amp;nbsp;power&amp;nbsp;exceeds 1.4MW,&amp;nbsp;the q profile&amp;nbsp;remains&amp;nbsp;unchanged&amp;nbsp;and&amp;nbsp;the&amp;nbsp;rotation&amp;nbsp;changes&amp;nbsp;only&amp;nbsp;very&amp;nbsp;slightly&amp;nbsp;with&amp;nbsp;LHCD&amp;nbsp;power, suggesting&amp;nbsp;that&amp;nbsp;the&amp;nbsp;current&amp;nbsp;profile&amp;nbsp;is&amp;nbsp;closely&amp;nbsp;related&amp;nbsp;to&amp;nbsp;rotation.&amp;nbsp;In&amp;nbsp;order&amp;nbsp;to&amp;nbsp;further&amp;nbsp;analyze&amp;nbsp;the&amp;nbsp;dynamic&amp;nbsp;process of&amp;nbsp;plasma&amp;nbsp;toroidal&amp;nbsp;rotation&amp;nbsp;driven&amp;nbsp;by&amp;nbsp;lower&amp;nbsp;hybrid&amp;nbsp;current&amp;nbsp;drive&amp;nbsp;on&amp;nbsp;EAST,&amp;nbsp;the&amp;nbsp;toroidal&amp;nbsp;momentum&amp;nbsp;transport due&amp;nbsp;to&amp;nbsp;LHCD&amp;nbsp;is&amp;nbsp;deduced&amp;nbsp;by&amp;nbsp;using&amp;nbsp;the&amp;nbsp;modulated&amp;nbsp;LHCD&amp;nbsp;power&amp;nbsp;injection.&amp;nbsp;Based&amp;nbsp;on&amp;nbsp;the&amp;nbsp;momentum&amp;nbsp;balance equation,&amp;nbsp;the&amp;nbsp;toroidal&amp;nbsp;momentum&amp;nbsp;diffusion&amp;nbsp;coefficient&amp;nbsp;(cj)&amp;nbsp;and&amp;nbsp;the&amp;nbsp;toroidal&amp;nbsp;momentum&amp;nbsp;pinch&amp;nbsp;coefficient&amp;nbsp;(Vpinch) are&amp;nbsp;obtained&amp;nbsp;by&amp;nbsp;the&amp;nbsp;method&amp;nbsp;of&amp;nbsp;separation&amp;nbsp;of&amp;nbsp;variables&amp;nbsp;and&amp;nbsp;Fourier&amp;nbsp;analysis&amp;nbsp;for&amp;nbsp;the&amp;nbsp;region&amp;nbsp;where&amp;nbsp;the&amp;nbsp;external momentum&amp;nbsp;source&amp;nbsp;can&amp;nbsp;be&amp;nbsp;ignored.&amp;nbsp;It&amp;nbsp;is&amp;nbsp;found&amp;nbsp;that&amp;nbsp;the&amp;nbsp;momentum&amp;nbsp;diffusion&amp;nbsp;coefficient&amp;nbsp;(cj)&amp;nbsp;and&amp;nbsp;momentum pinch&amp;nbsp;coefficient&amp;nbsp;(Vpinch)&amp;nbsp;tend&amp;nbsp;to&amp;nbsp;increase&amp;nbsp;from&amp;nbsp;the&amp;nbsp;core&amp;nbsp;to&amp;nbsp;the&amp;nbsp;outer&amp;nbsp;region.&amp;nbsp;This&amp;nbsp;is&amp;nbsp;consistent&amp;nbsp;with&amp;nbsp;the characteristic&amp;nbsp;that&amp;nbsp;the&amp;nbsp;toroidal&amp;nbsp;rotation&amp;nbsp;velocity&amp;nbsp;first&amp;nbsp;changes&amp;nbsp;in&amp;nbsp;the&amp;nbsp;outer&amp;nbsp;region&amp;nbsp;and&amp;nbsp;then&amp;nbsp;propagates&amp;nbsp;to&amp;nbsp;the core&amp;nbsp;when&amp;nbsp;the&amp;nbsp;toroidal&amp;nbsp;rotation&amp;nbsp;is&amp;nbsp;driven&amp;nbsp;by&amp;nbsp;LHCD.</dc:description>
  <dc:subject>lower hybrid current drive; toroidal rotation velocity; safety factor; toroidal momentum transport</dc:subject>
  <dc:creator>Jin Yang</dc:creator>
  <dc:creator>Bo Lyu</dc:creator>
  <dc:creator>Dong Xiang</dc:creator>
  <dc:rights>PUBLIC</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by/4.0/</dc:rights>
  <dc:type>dataset</dc:type>
  <dc:relation>http://www.doi.org/10.7498/aps.69.20191716</dc:relation>
  <dc:publisher>Science Data Bank</dc:publisher>
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