59 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)

    Pets and people in residential care Towards a model of good practice; a project funded by the Joseph Rowntree Foundation

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    SIGLEAvailable from British Library Document Supply Centre-DSC:m00/17415 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

    Total design Towards a theory of total design

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    Part 1 of 'A Pilot Study to Consider the Organisation and Design in Relation to Products and People'Available from British Library Document Supply Centre- DSC:90/15441(Total) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
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