83 research outputs found

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

    Get PDF
    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)

    The polarized image of a synchrotron-emitting ring of gas orbiting a black hole

    Get PDF
    High Energy Astrophysic

    Event Horizon Telescope observations of the jet launching and collimation in Centaurus A

    Get PDF
    InstrumentationLarge scale structure and cosmolog

    Resolving the inner parsec of the blazar J1924-2914 with the event horizon telescope

    Get PDF
    Galaxie

    A universal power-law prescription for variability from synthetic images of black hole accretion flows

    Get PDF
    Instrumentatio

    First sagittarius A* Event Horizon Telescope results. VI. Testing the black hole metric

    Get PDF
    Galaxie

    First sagittarius A* Event Horizon Telescope results. IV. Variability, morphology, and black hole mass

    Get PDF
    Galaxie

    Millimeter light curves of sagittarius A* observed during the 2017 Event Horizon Telescope campaign

    Get PDF
    Galaxie
    corecore