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NRC nominee Nieh commits to independent safety mission
During a Senate Environment and Public Works Committee hearing today, Ho Nieh, President Donald Trump’s nominee to serve as a commissioner at the Nuclear Regulatory Commission, was urged to maintain the agency’s independence regardless of political pressure from the Trump administration.
Ralph Dux
Fusion Science and Technology | Volume 44 | Number 3 | November 2003 | Pages 708-715
Technical Paper | ASDEX Upgrade | doi.org/10.13182/FST03-A409
Articles are hosted by Taylor and Francis Online.
In the core of a burning fusion plasma, the contamination by impurities has to be kept below a critical level. Understanding and control of impurity transport and accumulation are thus an essential issue. Impurity injection experiments have been performed to determine the impurity transport coefficients in the core and in the steep gradient region of H-mode plasmas. The measurements in the edge were edge-localized-mode resolved, and in the center, sawtooth-resolved transport coefficients were obtained for several species covering a wide range of ion charges. Comparison of the experimental values with impurity transport simulations revealed the contribution of anomalous and neoclassical transport in the different parts of the plasma. Discharge scenarios, which show impurity accumulation, were identified and control schemes were demonstrated.