Beam discharge excited by distributed virtual cathode |
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Authors: | V N Barabanov A E Dubinov M V Loiko S K Saikov V D Selemir V P Tarakanov |
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Institution: | 1.Russian Federal Nuclear Center,All-Russia Research Institute of Experimental Physics,Sarov, Nizhni Novgorod oblast,Russia;2.Joint Institute for High Temperatures,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | A new type of beam discharge, i.e., beam discharge with a distributed virtual cathode (VC) is proposed and considered by numerical
simulation. The discharge is established during counter motion of high-current electron beams in a gas-filled equipotential
cavity and is characterized by a state of hot dense electron plasma of primary electrons. The discharge temporal dynamics
is studied. It is shown that the VC lifetime depends linearly from this sum in a wide range of the sum of beam currents, from
the boundary current of two-beam instability to the critical current of Pierce instability. Generation of nonlinear electrostatic
structures shaped as phase bubbles in the discharge is detected, and their dynamics is studied. The parameters are determined,
at which the multiple coexistence of phase bubbles and their coalescence during collisions is observed. |
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