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A NEW PROBE-BASED METHOD FOR MEASURING THE DIFFUSION COEFFICIENT IN THE TOKAMAK EDGE REGION

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F06%3A00050572" target="_blank" >RIV/61389021:_____/06:00050572 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    A NEW PROBE-BASED METHOD FOR MEASURING THE DIFFUSION COEFFICIENT IN THE TOKAMAK EDGE REGION

  • Original language description

    A new method for measuring the diffusion coefficient in the edge plasma of fusion devices is presented. The method is based on studying the decay of the plasma fluctuation spectrum inside a small ceramic tube having its mouth flush with a magnetic surface and its axis aligned along the radial direction. The plasma fluctuations are detected by an electrode, radially movable inside the tube. In the experiment described herein, which was performed in the edge region of the CASTOR tokamak, the electrode measured the floating potential. The experimental arrangement is the same used for the direct plasma potential measurements according to the ?Ball-pen probe?, which design is based on the Katsumata probe principle. When the electrode protrudes from the tube, the measured signal shows the floating potential fluctuations of the plasma. Retracting the electrode into the tube, the signal power spectrum displays a decay. This decay is different for different frequencies, and is exponential.

  • Czech name

    Nová sondová metoda pro měření difúzního koeficientu v okrajovém plazmatu tokamaku

  • Czech description

    Práce představuje novou metodu na měření difúzního koeficientu v okrajovém plazmatu. Metoda je založená na analýze statistických vlastností signálu měřeného uvnitř ball-pen sondy. Ball-pen sonda se skládá z kovového kolektoru uvnitř boron-nitridového tunelu. Z ubývající spektrální hustoty signálu uvnitř tohoto tunelu lze, za předpokladu difúzního šíření plazmatu, určit difúzní koeficient. Tvar křivky naměřeného difúzního koeficientu se shoduje s tvarem křivky koeficientu Bohmovy difúze. Hodnoty difúzního koeficientu souhlasí s hodnotami měřenými v předchozích pracích.

Classification

  • Type

    D - Article in proceedings

  • CEP classification

    BL - Plasma physics and discharge through gases

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/KJB100430601" target="_blank" >KJB100430601: Development of the novel method of the direct plasma potential measurements in magnetic confinement fusion devices.</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2006

  • Confidentiality

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

Data specific for result type

  • Article name in the collection

    Proceedings of the 33rd EPS Conference on Plasma Physics

  • ISBN

    2-914771-40-1

  • ISSN

  • e-ISSN

  • Number of pages

    8

  • Pages from-to

  • Publisher name

    European Physical Society

  • Place of publication

    Frascati

  • Event location

    Řím

  • Event date

    Jun 19, 2006

  • Type of event by nationality

    WRD - Celosvětová akce

  • UT code for WoS article