63 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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    Plant spatial arrangement affects projected invasion speeds of two invasive thistles

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    Contains fulltext : 84232.pdf (postprint version ) (Open Access

    Shipment and storage effects on the terminal velocity of seeds

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    Contains fulltext : 84022.pdf (postprint version ) (Open Access)10 p

    Unrecognized impact of a biocontrol agent on the spread rate of an invasive thistle

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    Contains fulltext : 130530.pdf (publisher's version ) (Open Access

    Spatial dynamics of invasive Carduus thistles

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    Contains fulltext : 94183.pdf (preprint version ) (Open Access)MODSIM2011, 19th International Congress on Modelling and Simulation, Perth, Australia, 12–16 December 2011, 12 december 201

    A SEARCH FOR F PRODUCTION IN 360-GeV/c pi- p INTERACTIONS

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    We present the results of a search for charm F mesons in 360 GeV/cπ̅p interactions. Several methods have been used; all yield no evidence for the F and are interpreted as 90% confidence level cross section upper limits

    INCLUSIVE PROPERTIES OF D MESONS PRODUCED IN 360-GeV pi- p INTERACTIONS

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    The inclusive cross sections for forward D meson production at √s = 26 Gev in π-p interactions have been measured to be: σ(π̅p→D<SUP>0</SUP>/D<SUP>−0</SUP>)X<SUB>F</SUB>&gt;0 = (10.1±2.2) μb, σ(π̅p→D<SUP>±</SUP> + X)X<SUB>F</SUB>&gt;0 = (5.7±1.6) μb . The distribution in X<SUB>F</SUB>for all D and for X<SUB>F</SUB> &gt; 0 has the form dσ/dX<SUB>F</SUB> = 107<SUP>+39</SUP><SUB>-37</SUB>(1-X<SUB>F</SUB>)7.5<SUP>+2.5</SUP><SUB>-1.7</SUB> + 5.4<SUP>+6.0</SUP><SUB>-3.8</SUB>(1-X<SUB>F</SUB>)0.7<SUP>1.0</SUP><SUB>-0.7</SUB>μb, with evidence for leading D production. The P<SUP>2</SUP><SUB>T</SUB> distribution is exponential with slope parameter [−1.18<SUP>+0.18</SUP><SUB>−0.16</SUB>](GeV/c)<SUP>−2</SUP>. The data are compared with predictions from first-order quark/gluon fusion calculations
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