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Many technical improvements were achieved recently in the HT-7 superconducting tokamak, such as ICRF boronization, new water cooling graphite limiters which is instead of molybdenum limiter, and application of ferritic steel for reducing the magnetic ripple, and so on. The global impurity content and impurity components were measured and studied by using of spectroscopy diagnostics in the HT-7 tokamak...
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