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The role of the plasma current in turbulence decrease during lower hybrid current drive

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00509309" target="_blank" >RIV/61389021:_____/17:00509309 - isvavai.cz</a>

  • Result on the web

    <a href="https://aip.scitation.org/doi/10.1063/1.4978486" target="_blank" >https://aip.scitation.org/doi/10.1063/1.4978486</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1063/1.4978486" target="_blank" >10.1063/1.4978486</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    The role of the plasma current in turbulence decrease during lower hybrid current drive

  • Original language description

    The interaction of radio frequency (RF) waves with edge turbulence has resurfaced after the results obtained on many tokamaks showing that edge turbulence decreases when the ion cyclotron frequency heating (ICRH) is switched on. Using the lower hybrid (LH) waves to drive current into tokamak plasmas, this issue presented contradicting results with some tokamaks (FTU & HT-7) showing a net decrease, similar to the ICRH results, and others (Tore Supra) did not. In this article, these apparent discrepancies among tokamaks and RF wave frequencies are removed. It is found that turbulence large-scale structures in the scrape-off layer decrease at high enough plasma currents (I-p) on the Tore Supra tokamak. We distinguish three regimes: At low I-p's, no modification is detected with statistical properties of turbulence similar to ohmic plasmas even with P-LH reaching 4.8MW. At moderate plasma currents, turbulence properties are modified only at a high LH power. At high plasma currents, turbulent large scales are reduced to values smaller than 1 cm, and this is accompanied by a net decrease in the level of turbulence of about 30% even with a moderate LH power.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10305 - Fluids and plasma physics (including surface physics)

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2017

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Physics of Plasmas

  • ISSN

    1070-664X

  • e-ISSN

  • Volume of the periodical

    24

  • Issue of the periodical within the volume

    3

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    6

  • Pages from-to

    032307

  • UT code for WoS article

    000397872500032

  • EID of the result in the Scopus database

    2-s2.0-85016139828