Toward a first-principles integrated simulation of tokamak edge plasmas

Performance of the ITER is anticipated to be highly sensitive to the edge plasma condition. The edge pedestal in ITER needs to be predicted from an integrated simulation of the necessary first-principles, multi-scale physics codes. The mission of the SciDAC Fusion Simulation Project (FSP) Prototype Center for Plasma Edge Simulation (CPES) is to deliver such a code integration framework by (1) building new kinetic codes XGC0 and XGC1, which can simulate the edge pedestal buildup; (2) using and improving the existing MHD codes ELITE, M3D-OMP, M3D-MPP and NIMROD, for study of large-scale edge instabilities called Edge Localized Modes (ELMs); and (3) integrating the codes into a framework using cutting-edge computer science technology. Collaborative effort among physics, computer science, and applied mathematics within CPES has created the first working version of the End-to-end Framework for Fusion Integrated Simulation (EFFIS), which can be used to study the pedestal-ELM cycles

INELASTIC PROCESSES IN 0.1-1000 keV/u COLLISIONS OF Ne

: Owing to the potential use of neon as an intentionally introduced radiating impurity in fusion reactor divertors, we present here cross sections for (i) ionization, (ii) state-selective excitation, and (iii) state-selective charge transfer in 0.1-1000 keV/u collisions of Ne q+ (q=7-10) with H. The cross sections may be used in modeling and diagnosing the distribution and state of these ions as well as other parameters of the core, edge, and divertor regions of the plasma. We have utilized the theory of hidden crossings in the low energy portion of the energy range considered and the classical trajectory Monte Carlo method throughout the high energy portion. 1. INTRODUCTION The previous decades have shown an ever closer approach to the goal of break-even in fusion reactors. As this goal is obtained, the direction of research will turn more and more towards the physics and engineering study of burning plasmas. Therefore, with the production of significant quantities of fusion-produc..

Performance Analysis of SSC Diversity Receiver over Correlated Ricean Fading Channels in the Presence of Cochannel Interference

In this paper an approach to the performance analysis of a dual-branch switched-and-stay combining (SSC) diversity receiver, operating over interference-limited Ricean correlated fading environment, is presented. Infinite series expressions are obtained for the output signal-to-interference ratio's (SIR) probability density function (PDF) and cumulative distribution function (CDF). Using these new formulae, the outage probability (OP) and the average symbol error probability (ASEP) for modulation schemes such as noncoherent frequency-shift keying (NCFSK) and binary differentially phase-shift keying (BDPSK) are efficiently evaluated. Numerical results, presented into this paper, are graphically presented and analyzed, in order to point out the effects of fading severity and the level of correlation on the system performances