Plasma Current and Conductivity Effects on Hose Instability.
NAVAL RESEARCH LAB WASHINGTON DC
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Hose instability dispersion relations are derived for a relativistic beam propagating in weakly ionized gas, which include a self-consistent treatment of the spatial and temporal evolution of plasma conductivity and plasma current. In some regimes the results are dramatically different from these found previously for a beam propagating in a fixed conductivity channel. For example, the hose growth rate is found to decrease with increasing beam I sub b, for a beam propagating in initially neutral gas, even though the plasma return current fraction increases rapidly with I sub b. As another example, it is found that an externally driven discharge current can completely eliminate hose instability in a fixed conductivity channel, but causes only a weak decrease in growth rate when the plasma conductivity is modeled self-consistently. Author
- Nuclear Physics and Elementary Particle Physics
- Plasma Physics and Magnetohydrodynamics