Travelling modes in wave-heated plasma sources

John Rayner, Andrew Cheetham

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    This paper describes a theoretical and experimental study of surface- and helicon-wave-heated plasma sources in which standing waves are set up in the cavity between the closed end plate to a plasma vessel and a wave launcher while travelling waves propagate from the opposite side of the launcher into a region which is long compared with the attenuation distance of the waves. We model the situation as a lossy transmission line of finite length coupled at the launcher to a lossy transmission line of infinite extent. RF power applied to the launcher divides in the ratio of the input impedances of the two transmission lines. For a conducting end plate, the power delivered to the travelling waves is a maximum when the cavity length is an odd number of 1/4 wavelengths long for which its input impedance is a maximum. Similarly, for an insulated end plate, the power delivered to the travelling waves is a maximum for a cavity with a length equal to an integer number of half wavelengths for which its input impedance is again a maximum.
    Original languageEnglish
    Pages (from-to)62-72
    Number of pages11
    JournalIEEE Transactions on Plasma Science
    Volume38
    Issue number2
    DOIs
    Publication statusPublished - 2010

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    launchers
    plasma waves
    end plates
    traveling waves
    transmission lines
    impedance
    cavities
    standing waves
    wavelengths
    integers
    vessels
    attenuation
    conduction

    Cite this

    Rayner, John ; Cheetham, Andrew. / Travelling modes in wave-heated plasma sources. In: IEEE Transactions on Plasma Science. 2010 ; Vol. 38, No. 2. pp. 62-72.
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    Travelling modes in wave-heated plasma sources. / Rayner, John; Cheetham, Andrew.

    In: IEEE Transactions on Plasma Science, Vol. 38, No. 2, 2010, p. 62-72.

    Research output: Contribution to journalArticle

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    AU - Cheetham, Andrew

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    AB - This paper describes a theoretical and experimental study of surface- and helicon-wave-heated plasma sources in which standing waves are set up in the cavity between the closed end plate to a plasma vessel and a wave launcher while travelling waves propagate from the opposite side of the launcher into a region which is long compared with the attenuation distance of the waves. We model the situation as a lossy transmission line of finite length coupled at the launcher to a lossy transmission line of infinite extent. RF power applied to the launcher divides in the ratio of the input impedances of the two transmission lines. For a conducting end plate, the power delivered to the travelling waves is a maximum when the cavity length is an odd number of 1/4 wavelengths long for which its input impedance is a maximum. Similarly, for an insulated end plate, the power delivered to the travelling waves is a maximum for a cavity with a length equal to an integer number of half wavelengths for which its input impedance is again a maximum.

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