Parameter Survey for Collisionless Coupling in a Laser Simulation of HANE (High Altitude Nuclear Explosion).
NAVAL RESEARCH LAB WASHINGTON DC
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We present a set of criteria for collisionless coupling of debris-air plasmas via the magnetized ion-ion instability MII for conditions relevant to the NRL DNA laser experiment. The criteria are based upon 1 a transit time of ions across the coupling shell sufficiently long to allow significant momentum exchange between the debris and air ions 2 non-stabilization of the MII by electromagnetic effects 3 a system size sufficiently large to contain at least a target mass of background gas and 4 allowance for a high beta expansion i.e., super-Alvenic expansion. A series of figures are presented which display these criteria graphically and indicate the coupling regime for parameters pertinent to the NRL experiment. We conclude that the proposed NRL upgraded facility e.g., stronger magnetic field and larger target chamber should be adequate to test the collisionless coupling criteria set forth in Lampe. Author
- Nuclear Weapons