乱流実験トーラス装置の設計

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タイトル別名
  • Design of Toroidal Machine for Plasma-Turbulence Research
  • ランリュウ ジッケン トーラス ソウチ ノ セッケイ

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The toroidal machine has been designed appropriate to do the experiments leading to the breakthrough in researches of plasma turbulence and turbulent transport. The proposed new device can realize high accessibility and flexibility for performing physics experiments, particularly for realizing super multiple computer tomography (SMCT) that is the major diagnostics newly developed in this proposal. The diagnostics can observe wide range of different scales of fluctuations and cover the whole plasma cross-section. The proposal of this new device with the ambitious diagnostics is based on quite different concept that includes Japanese original ideas. Among toroidal machines tokamak will be appropriate for the experiment. The following machine parameters might be required as a rough target to obtain the plasma parameter required for diagnostics: the magnetic field strength of about 1 Tesla, the plasma major and minor radii of about 1 m and 30cm, respectively, and the plasma current of about 150kA. The top priority in designing the machine is put on versatility and flexibility of ports to enable detailed measurements of plasma parameters. Characteristic point is that the machine is equipped with diagnostics ports on the high field side. The shape of the toroidal field coil is not circular but D-shape-like to produce non-circular plasmas, which allows for the study of the influence of magnetic geometries and the realization of high plasma performance. There are two ways to energize the coils in a quasi-steady state: one is to use flywheel, motor-generator and thyristor stacks, and the other one is to use condenser banks. Here the priority is put on the condenser bank. Arbitrary waveforms of the coil current can be obtained by using IGBT as a switching element, of which characteristics are of higher frequency (several to 10 kHz) than that of thyristors with rectification of about 1 kHz. The high frequency characteristics result in low voltage ripple on the coil because high frequency noises are relatively easily removed with filters. Low level of noises will be essentially important for detailed measurements of fluctuations.

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