75 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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    The domestic structure of European Community policy-making in West Germany

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    SIGLEAvailable from British Library Document Supply Centre- DSC:DX188643 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

    Negotiating Transparency: The Role of Institutions

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    On 30 May 2001, a new regulation on public access to EU documents was presented and was heralded in the European press as a breakthrough for transparency. We argue that a focus on institutions can cast light on the negotiation processes that led to this decision, and explain the final-for realist negotiation theory puzzling-outcome. We demonstrate the importance of institutions in EU negotiations by detailing actor interests and strategies in the transparency case, and by tracing and analysing the negotiation process that resulted in the regulation. The institutions that receive particular attention are: agenda-shaping rules, decision-making procedures and voting rules, informal norms, time tables and deadlines, and intervention by institutional actors. Copyright Blackwell Publishing Ltd 2004.
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