A. Portas

TL;DR: Recently, 536 new acquisition channels, made-up of three different channel types, have been incorporated into the TJ-II data acquisition system (DAQ).

TL;DR: The TJ-II is a four period, low magnetic shear stellarator with high degree of configuration flexibility as discussed by the authors, which has been operating in Madrid since 1998 (R=1.5 m, a

TL;DR: Synchronization mechanisms for the TJ-II local area network environment have been enhanced by the development of new capabilities, providing “soft synchronization,” that is notification of asynchronous events for situations in which some delay between the real event and message reception is not a critical point.

Abstract: Significant differences in the ratio between the He-like carbon triplet lines 1s2s $^{3}$${\mathit{S}}_{1\mathrm{\ensuremath{-}}}$1s2p $^{3}$${\mathit{P}}_{2}$ (2271.59 \AA{}) and 1s2${\mathit{p}}^{3}$${\mathit{S}}_{1\mathrm{\ensuremath{-}}}$1s2p $^{3}$${\mathit{P}}_{0,1}$ (2278.41 \AA{}) have been observed in line of sight measurements across the TJ-I tokamak. Such variations, which deviate from the 2 $^{3}$P level statistical ratios, have not been reported for this line ratio in similar fusion plasmas. We show that such differences can be explained by charge exchange, involving collisions between H-like carbon ions and neutral hydrogen atoms, while ruling out excitation and deexcitation by electron collisions and line blending effects. Finally we discuss similar transitions in other low Z ions and propose monitoring these variations as a spectroscopic tool for estimating relative neutral concentrations in plasmas. (c) 1995 The American Physical Society