This work presents a novel modeling paradigm of the dynamical negotiation between clients running TCP (Transmission Control Protocol) and routers with the RED (Random Early Detection) active queue management scheme. The basic aim of the modeling is to understand the inherent nonlinearity in the interaction and how it manifests itself in the parametric sensitivities observed in practice. The mod...

LLE Review, Volume 67 119 The experimental study of parametric instabilities in longscale-length laser plasmas is very important for inertial confinement fusion (ICF). Backscattered light near the incident light wavelength has been observed in many laserplasma experiments and is generally attributed to stimulated Brillouin scattering (SBS).1,2 Stimulated Brillouin scattering is a parametric ins...

It has long been recognized that broadband laser light the potential to control parametric instabilities in inertial-confinement-fusion (ICF) plasmas. Here, we use results from laser-plasma-interaction simulations estimate bandwidth requirements for mitigating three predominant classes of direct-drive ICF implosions: cross-beam energy transfer (CBET), two-plasmon decay (TPD), and stimulated Ram...

Instabilities in a two-phase electromagnetohydrodynamic (EMHD) flow between a pair of parallel electrodes are explored. A linear stability analysis has been performed based on a coupled Orr-Sommerfeld system generated from the conservation laws. The study shows the presence of a finite-wave-number EMHD mode of instability in addition to the two commonly observed instability modes in the pressur...

Spherical tokamaks (STs) have been shown to possess properties desirable for a fusion power plant such as achieving high plasma ? and having increased vertical stability. To understand the confinement that might be expected in conceptual design $\beta$ ST reactor, 1GW equilibrium was analysed using local linear gyrokinetics determine type of micro-instabilities arise. Kinetic ballooning modes (...

At Brookhaven, an Electron Beam Ion Source (EBIS) is now operational. This source is being used as a test bed to answer questions relevant to the eventual design of an EBIS-based heavy ion injector for RHIC. Such a source can easily produce ions such as Au, but the challenge lies in reaching intensities of interest for RHIC (3 x 10 particles/pulse). The source studies are planned to address iss...

We study the stability of collective amplitude excitations in nonequilibrium polariton condensates. These excitations correspond to renormalized upper polaritons and to the collective amplitude modes of atomic gases and superconductors. They would be present following a quantum quench or could be created directly by resonant excitation. We show that uniform amplitude excitations are unstable to...

In inertial confinement fusion (ICF), where irradiation uniformity is a crucial issue, it is important to understand the process of laser-filamentation instability.' The breakup of laser light into filaments occurs as a result of plasma density depressions that form localized focusing channels. The density depressions may be caused either by ponderomotive forces2 due to laserplasma interactions...

The results of numerical models have been compared to the existing data to investigate damping mechanisms, check parametric dependencies and extrapolate the existing experimental results to reactor conditions that remain inaccessible to present day tokamaks. Stabilising mechanisms involving mode conversion to kinetic Alfvén waves have been identified. The comparison between theory and experimen...

We study parametric resonance of interacting waves having the same wave vector and frequency. In addition to the well-known period-doubling instability we show that under certain conditions the instability is caused by a Hopf bifurcation leading to quasiperiodic traveling waves. It occurs, for example, if the group velocities of both waves have different signs and the damping is weak. The dynam...