486 research outputs found

    Properties of a new quasi-axisymmetric configuration

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    A novel, compact, quasi-axisymmetric configuration is presented which exhibits low fast-particle losses and is stable to ideal MHD instabilities. The design has fast-particle loss rates below 8\% for flux surfaces within the half-radius, and is shown to have an MHD-stability limit of a normalised pressure of β=3%\langle\beta\rangle=3\% where β\langle\beta\rangle is volume averaged. The flux surfaces at various plasma betas and currents as calculated using the SPEC equilibrium code are presented. Neoclassical transport coefficients are shown to be similar to an equivalent tokamak, with a distinct banana regime at half-radius. An initial coil design study is presented to assess the feasibility of this configuration as a fusion-relevant experiment

    Current Control by ECCD for W7-X

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    Limits of Confinement Enhancement for Stellarators

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