57 research outputs found

    On the mechanisms governing gas penetration into a tokamak plasma during a massive gas injection

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    A new 1D radial fluid code, IMAGINE, is used to simulate the penetration of gas into a tokamak plasma during a massive gas injection (MGI). The main result is that the gas is in general strongly braked as it reaches the plasma, due to mechanisms related to charge exchange and (to a smaller extent) recombination. As a result, only a fraction of the gas penetrates into the plasma. Also, a shock wave is created in the gas which propagates away from the plasma, braking and compressing the incoming gas. Simulation results are quantitatively consistent, at least in terms of orders of magnitude, with experimental data for a D 2 MGI into a JET Ohmic plasma. Simulations of MGI into the background plasma surrounding a runaway electron beam show that if the background electron density is too high, the gas may not penetrate, suggesting a possible explanation for the recent results of Reux et al in JET (2015 Nucl. Fusion 55 093013)

    Overview of the JET results in support to ITER

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    Financial Inclusion and Social Protection: A Case for India Post

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    Analysis of empirical evidence from three Indian states suggests that financial inclusion strategies may be inefficient if designed without accounting for the government social protection programmes. Social protection programmes generate additional needs for financial services among the poor, meeting which can also deepen the impact of such programmes. Being a government department and the largest financial service-providing network, India Post may be most suitably located to implement such synergistic strategies. An examination of the official data on India Post indicates that the approach of diversifying its financial products to target higher-end clients in largely urban areas may not be appropriate due to its competitive disadvantage. We argue that delivery of financial services through post offices, built around social protection, may contribute to financial inclusion in rural areas while improving revenues of India Post
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